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- // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
- // Copyright(c) 2015-18 Intel Corporation.
- /*
- * stream.c - SoundWire Bus stream operations.
- */
- #include <linux/delay.h>
- #include <linux/device.h>
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/mod_devicetable.h>
- #include <linux/slab.h>
- #include <linux/soundwire/sdw_registers.h>
- #include <linux/soundwire/sdw.h>
- #include <sound/soc.h>
- #include "bus.h"
- /*
- * Array of supported rows and columns as per MIPI SoundWire Specification 1.1
- *
- * The rows are arranged as per the array index value programmed
- * in register. The index 15 has dummy value 0 in order to fill hole.
- */
- int sdw_rows[SDW_FRAME_ROWS] = {48, 50, 60, 64, 75, 80, 125, 147,
- 96, 100, 120, 128, 150, 160, 250, 0,
- 192, 200, 240, 256, 72, 144, 90, 180};
- EXPORT_SYMBOL(sdw_rows);
- int sdw_cols[SDW_FRAME_COLS] = {2, 4, 6, 8, 10, 12, 14, 16};
- EXPORT_SYMBOL(sdw_cols);
- int sdw_find_col_index(int col)
- {
- int i;
- for (i = 0; i < SDW_FRAME_COLS; i++) {
- if (sdw_cols[i] == col)
- return i;
- }
- pr_warn("Requested column not found, selecting lowest column no: 2\n");
- return 0;
- }
- EXPORT_SYMBOL(sdw_find_col_index);
- int sdw_find_row_index(int row)
- {
- int i;
- for (i = 0; i < SDW_FRAME_ROWS; i++) {
- if (sdw_rows[i] == row)
- return i;
- }
- pr_warn("Requested row not found, selecting lowest row no: 48\n");
- return 0;
- }
- EXPORT_SYMBOL(sdw_find_row_index);
- static int _sdw_program_slave_port_params(struct sdw_bus *bus,
- struct sdw_slave *slave,
- struct sdw_transport_params *t_params,
- enum sdw_dpn_type type)
- {
- u32 addr1, addr2, addr3, addr4;
- int ret;
- u16 wbuf;
- if (bus->params.next_bank) {
- addr1 = SDW_DPN_OFFSETCTRL2_B1(t_params->port_num);
- addr2 = SDW_DPN_BLOCKCTRL3_B1(t_params->port_num);
- addr3 = SDW_DPN_SAMPLECTRL2_B1(t_params->port_num);
- addr4 = SDW_DPN_HCTRL_B1(t_params->port_num);
- } else {
- addr1 = SDW_DPN_OFFSETCTRL2_B0(t_params->port_num);
- addr2 = SDW_DPN_BLOCKCTRL3_B0(t_params->port_num);
- addr3 = SDW_DPN_SAMPLECTRL2_B0(t_params->port_num);
- addr4 = SDW_DPN_HCTRL_B0(t_params->port_num);
- }
- /* Program DPN_OffsetCtrl2 registers */
- ret = sdw_write(slave, addr1, t_params->offset2);
- if (ret < 0) {
- dev_err(bus->dev, "DPN_OffsetCtrl2 register write failed\n");
- return ret;
- }
- /* Program DPN_BlockCtrl3 register */
- ret = sdw_write(slave, addr2, t_params->blk_pkg_mode);
- if (ret < 0) {
- dev_err(bus->dev, "DPN_BlockCtrl3 register write failed\n");
- return ret;
- }
- /*
- * Data ports are FULL, SIMPLE and REDUCED. This function handles
- * FULL and REDUCED only and beyond this point only FULL is
- * handled, so bail out if we are not FULL data port type
- */
- if (type != SDW_DPN_FULL)
- return ret;
- /* Program DPN_SampleCtrl2 register */
- wbuf = FIELD_GET(SDW_DPN_SAMPLECTRL_HIGH, t_params->sample_interval - 1);
- ret = sdw_write(slave, addr3, wbuf);
- if (ret < 0) {
- dev_err(bus->dev, "DPN_SampleCtrl2 register write failed\n");
- return ret;
- }
- /* Program DPN_HCtrl register */
- wbuf = FIELD_PREP(SDW_DPN_HCTRL_HSTART, t_params->hstart);
- wbuf |= FIELD_PREP(SDW_DPN_HCTRL_HSTOP, t_params->hstop);
- ret = sdw_write(slave, addr4, wbuf);
- if (ret < 0)
- dev_err(bus->dev, "DPN_HCtrl register write failed\n");
- return ret;
- }
- static int sdw_program_slave_port_params(struct sdw_bus *bus,
- struct sdw_slave_runtime *s_rt,
- struct sdw_port_runtime *p_rt)
- {
- struct sdw_transport_params *t_params = &p_rt->transport_params;
- struct sdw_port_params *p_params = &p_rt->port_params;
- struct sdw_slave_prop *slave_prop = &s_rt->slave->prop;
- u32 addr1, addr2, addr3, addr4, addr5, addr6;
- struct sdw_dpn_prop *dpn_prop;
- int ret;
- u8 wbuf;
- dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
- s_rt->direction,
- t_params->port_num);
- if (!dpn_prop)
- return -EINVAL;
- addr1 = SDW_DPN_PORTCTRL(t_params->port_num);
- addr2 = SDW_DPN_BLOCKCTRL1(t_params->port_num);
- if (bus->params.next_bank) {
- addr3 = SDW_DPN_SAMPLECTRL1_B1(t_params->port_num);
- addr4 = SDW_DPN_OFFSETCTRL1_B1(t_params->port_num);
- addr5 = SDW_DPN_BLOCKCTRL2_B1(t_params->port_num);
- addr6 = SDW_DPN_LANECTRL_B1(t_params->port_num);
- } else {
- addr3 = SDW_DPN_SAMPLECTRL1_B0(t_params->port_num);
- addr4 = SDW_DPN_OFFSETCTRL1_B0(t_params->port_num);
- addr5 = SDW_DPN_BLOCKCTRL2_B0(t_params->port_num);
- addr6 = SDW_DPN_LANECTRL_B0(t_params->port_num);
- }
- /* Program DPN_PortCtrl register */
- wbuf = FIELD_PREP(SDW_DPN_PORTCTRL_DATAMODE, p_params->data_mode);
- wbuf |= FIELD_PREP(SDW_DPN_PORTCTRL_FLOWMODE, p_params->flow_mode);
- ret = sdw_update(s_rt->slave, addr1, 0xF, wbuf);
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "DPN_PortCtrl register write failed for port %d\n",
- t_params->port_num);
- return ret;
- }
- if (!dpn_prop->read_only_wordlength) {
- /* Program DPN_BlockCtrl1 register */
- ret = sdw_write(s_rt->slave, addr2, (p_params->bps - 1));
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "DPN_BlockCtrl1 register write failed for port %d\n",
- t_params->port_num);
- return ret;
- }
- }
- /* Program DPN_SampleCtrl1 register */
- wbuf = (t_params->sample_interval - 1) & SDW_DPN_SAMPLECTRL_LOW;
- ret = sdw_write(s_rt->slave, addr3, wbuf);
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "DPN_SampleCtrl1 register write failed for port %d\n",
- t_params->port_num);
- return ret;
- }
- /* Program DPN_OffsetCtrl1 registers */
- ret = sdw_write(s_rt->slave, addr4, t_params->offset1);
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "DPN_OffsetCtrl1 register write failed for port %d\n",
- t_params->port_num);
- return ret;
- }
- /* Program DPN_BlockCtrl2 register*/
- if (t_params->blk_grp_ctrl_valid) {
- ret = sdw_write(s_rt->slave, addr5, t_params->blk_grp_ctrl);
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "DPN_BlockCtrl2 reg write failed for port %d\n",
- t_params->port_num);
- return ret;
- }
- }
- /* program DPN_LaneCtrl register */
- if (slave_prop->lane_control_support) {
- ret = sdw_write(s_rt->slave, addr6, t_params->lane_ctrl);
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "DPN_LaneCtrl register write failed for port %d\n",
- t_params->port_num);
- return ret;
- }
- }
- if (dpn_prop->type != SDW_DPN_SIMPLE) {
- ret = _sdw_program_slave_port_params(bus, s_rt->slave,
- t_params, dpn_prop->type);
- if (ret < 0)
- dev_err(&s_rt->slave->dev,
- "Transport reg write failed for port: %d\n",
- t_params->port_num);
- }
- return ret;
- }
- static int sdw_program_master_port_params(struct sdw_bus *bus,
- struct sdw_port_runtime *p_rt)
- {
- int ret;
- /*
- * we need to set transport and port parameters for the port.
- * Transport parameters refers to the sample interval, offsets and
- * hstart/stop etc of the data. Port parameters refers to word
- * length, flow mode etc of the port
- */
- ret = bus->port_ops->dpn_set_port_transport_params(bus,
- &p_rt->transport_params,
- bus->params.next_bank);
- if (ret < 0)
- return ret;
- return bus->port_ops->dpn_set_port_params(bus,
- &p_rt->port_params,
- bus->params.next_bank);
- }
- /**
- * sdw_program_port_params() - Programs transport parameters of Master(s)
- * and Slave(s)
- *
- * @m_rt: Master stream runtime
- */
- static int sdw_program_port_params(struct sdw_master_runtime *m_rt)
- {
- struct sdw_slave_runtime *s_rt = NULL;
- struct sdw_bus *bus = m_rt->bus;
- struct sdw_port_runtime *p_rt;
- int ret = 0;
- /* Program transport & port parameters for Slave(s) */
- list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
- list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
- ret = sdw_program_slave_port_params(bus, s_rt, p_rt);
- if (ret < 0)
- return ret;
- }
- }
- /* Program transport & port parameters for Master(s) */
- list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
- ret = sdw_program_master_port_params(bus, p_rt);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- /**
- * sdw_enable_disable_slave_ports: Enable/disable slave data port
- *
- * @bus: bus instance
- * @s_rt: slave runtime
- * @p_rt: port runtime
- * @en: enable or disable operation
- *
- * This function only sets the enable/disable bits in the relevant bank, the
- * actual enable/disable is done with a bank switch
- */
- static int sdw_enable_disable_slave_ports(struct sdw_bus *bus,
- struct sdw_slave_runtime *s_rt,
- struct sdw_port_runtime *p_rt,
- bool en)
- {
- struct sdw_transport_params *t_params = &p_rt->transport_params;
- u32 addr;
- int ret;
- if (bus->params.next_bank)
- addr = SDW_DPN_CHANNELEN_B1(p_rt->num);
- else
- addr = SDW_DPN_CHANNELEN_B0(p_rt->num);
- /*
- * Since bus doesn't support sharing a port across two streams,
- * it is safe to reset this register
- */
- if (en)
- ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
- else
- ret = sdw_write(s_rt->slave, addr, 0x0);
- if (ret < 0)
- dev_err(&s_rt->slave->dev,
- "Slave chn_en reg write failed:%d port:%d\n",
- ret, t_params->port_num);
- return ret;
- }
- static int sdw_enable_disable_master_ports(struct sdw_master_runtime *m_rt,
- struct sdw_port_runtime *p_rt,
- bool en)
- {
- struct sdw_transport_params *t_params = &p_rt->transport_params;
- struct sdw_bus *bus = m_rt->bus;
- struct sdw_enable_ch enable_ch;
- int ret;
- enable_ch.port_num = p_rt->num;
- enable_ch.ch_mask = p_rt->ch_mask;
- enable_ch.enable = en;
- /* Perform Master port channel(s) enable/disable */
- if (bus->port_ops->dpn_port_enable_ch) {
- ret = bus->port_ops->dpn_port_enable_ch(bus,
- &enable_ch,
- bus->params.next_bank);
- if (ret < 0) {
- dev_err(bus->dev,
- "Master chn_en write failed:%d port:%d\n",
- ret, t_params->port_num);
- return ret;
- }
- } else {
- dev_err(bus->dev,
- "dpn_port_enable_ch not supported, %s failed\n",
- en ? "enable" : "disable");
- return -EINVAL;
- }
- return 0;
- }
- /**
- * sdw_enable_disable_ports() - Enable/disable port(s) for Master and
- * Slave(s)
- *
- * @m_rt: Master stream runtime
- * @en: mode (enable/disable)
- */
- static int sdw_enable_disable_ports(struct sdw_master_runtime *m_rt, bool en)
- {
- struct sdw_port_runtime *s_port, *m_port;
- struct sdw_slave_runtime *s_rt;
- int ret = 0;
- /* Enable/Disable Slave port(s) */
- list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
- list_for_each_entry(s_port, &s_rt->port_list, port_node) {
- ret = sdw_enable_disable_slave_ports(m_rt->bus, s_rt,
- s_port, en);
- if (ret < 0)
- return ret;
- }
- }
- /* Enable/Disable Master port(s) */
- list_for_each_entry(m_port, &m_rt->port_list, port_node) {
- ret = sdw_enable_disable_master_ports(m_rt, m_port, en);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- static int sdw_do_port_prep(struct sdw_slave_runtime *s_rt,
- struct sdw_prepare_ch prep_ch,
- enum sdw_port_prep_ops cmd)
- {
- const struct sdw_slave_ops *ops = s_rt->slave->ops;
- int ret;
- if (ops->port_prep) {
- ret = ops->port_prep(s_rt->slave, &prep_ch, cmd);
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "Slave Port Prep cmd %d failed: %d\n",
- cmd, ret);
- return ret;
- }
- }
- return 0;
- }
- static int sdw_prep_deprep_slave_ports(struct sdw_bus *bus,
- struct sdw_slave_runtime *s_rt,
- struct sdw_port_runtime *p_rt,
- bool prep)
- {
- struct completion *port_ready;
- struct sdw_dpn_prop *dpn_prop;
- struct sdw_prepare_ch prep_ch;
- bool intr = false;
- int ret = 0, val;
- u32 addr;
- prep_ch.num = p_rt->num;
- prep_ch.ch_mask = p_rt->ch_mask;
- dpn_prop = sdw_get_slave_dpn_prop(s_rt->slave,
- s_rt->direction,
- prep_ch.num);
- if (!dpn_prop) {
- dev_err(bus->dev,
- "Slave Port:%d properties not found\n", prep_ch.num);
- return -EINVAL;
- }
- prep_ch.prepare = prep;
- prep_ch.bank = bus->params.next_bank;
- if (dpn_prop->imp_def_interrupts || !dpn_prop->simple_ch_prep_sm ||
- bus->params.s_data_mode != SDW_PORT_DATA_MODE_NORMAL)
- intr = true;
- /*
- * Enable interrupt before Port prepare.
- * For Port de-prepare, it is assumed that port
- * was prepared earlier
- */
- if (prep && intr) {
- ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
- dpn_prop->imp_def_interrupts);
- if (ret < 0)
- return ret;
- }
- /* Inform slave about the impending port prepare */
- sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_PRE_PREP);
- /* Prepare Slave port implementing CP_SM */
- if (!dpn_prop->simple_ch_prep_sm) {
- addr = SDW_DPN_PREPARECTRL(p_rt->num);
- if (prep)
- ret = sdw_write(s_rt->slave, addr, p_rt->ch_mask);
- else
- ret = sdw_write(s_rt->slave, addr, 0x0);
- if (ret < 0) {
- dev_err(&s_rt->slave->dev,
- "Slave prep_ctrl reg write failed\n");
- return ret;
- }
- /* Wait for completion on port ready */
- port_ready = &s_rt->slave->port_ready[prep_ch.num];
- wait_for_completion_timeout(port_ready,
- msecs_to_jiffies(dpn_prop->ch_prep_timeout));
- val = sdw_read(s_rt->slave, SDW_DPN_PREPARESTATUS(p_rt->num));
- if ((val < 0) || (val & p_rt->ch_mask)) {
- ret = (val < 0) ? val : -ETIMEDOUT;
- dev_err(&s_rt->slave->dev,
- "Chn prep failed for port %d: %d\n", prep_ch.num, ret);
- return ret;
- }
- }
- /* Inform slaves about ports prepared */
- sdw_do_port_prep(s_rt, prep_ch, SDW_OPS_PORT_POST_PREP);
- /* Disable interrupt after Port de-prepare */
- if (!prep && intr)
- ret = sdw_configure_dpn_intr(s_rt->slave, p_rt->num, prep,
- dpn_prop->imp_def_interrupts);
- return ret;
- }
- static int sdw_prep_deprep_master_ports(struct sdw_master_runtime *m_rt,
- struct sdw_port_runtime *p_rt,
- bool prep)
- {
- struct sdw_transport_params *t_params = &p_rt->transport_params;
- struct sdw_bus *bus = m_rt->bus;
- const struct sdw_master_port_ops *ops = bus->port_ops;
- struct sdw_prepare_ch prep_ch;
- int ret = 0;
- prep_ch.num = p_rt->num;
- prep_ch.ch_mask = p_rt->ch_mask;
- prep_ch.prepare = prep; /* Prepare/De-prepare */
- prep_ch.bank = bus->params.next_bank;
- /* Pre-prepare/Pre-deprepare port(s) */
- if (ops->dpn_port_prep) {
- ret = ops->dpn_port_prep(bus, &prep_ch);
- if (ret < 0) {
- dev_err(bus->dev, "Port prepare failed for port:%d\n",
- t_params->port_num);
- return ret;
- }
- }
- return ret;
- }
- /**
- * sdw_prep_deprep_ports() - Prepare/De-prepare port(s) for Master(s) and
- * Slave(s)
- *
- * @m_rt: Master runtime handle
- * @prep: Prepare or De-prepare
- */
- static int sdw_prep_deprep_ports(struct sdw_master_runtime *m_rt, bool prep)
- {
- struct sdw_slave_runtime *s_rt;
- struct sdw_port_runtime *p_rt;
- int ret = 0;
- /* Prepare/De-prepare Slave port(s) */
- list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
- list_for_each_entry(p_rt, &s_rt->port_list, port_node) {
- ret = sdw_prep_deprep_slave_ports(m_rt->bus, s_rt,
- p_rt, prep);
- if (ret < 0)
- return ret;
- }
- }
- /* Prepare/De-prepare Master port(s) */
- list_for_each_entry(p_rt, &m_rt->port_list, port_node) {
- ret = sdw_prep_deprep_master_ports(m_rt, p_rt, prep);
- if (ret < 0)
- return ret;
- }
- return ret;
- }
- /**
- * sdw_notify_config() - Notify bus configuration
- *
- * @m_rt: Master runtime handle
- *
- * This function notifies the Master(s) and Slave(s) of the
- * new bus configuration.
- */
- static int sdw_notify_config(struct sdw_master_runtime *m_rt)
- {
- struct sdw_slave_runtime *s_rt;
- struct sdw_bus *bus = m_rt->bus;
- struct sdw_slave *slave;
- int ret = 0;
- if (bus->ops->set_bus_conf) {
- ret = bus->ops->set_bus_conf(bus, &bus->params);
- if (ret < 0)
- return ret;
- }
- list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
- slave = s_rt->slave;
- if (slave->ops->bus_config) {
- ret = slave->ops->bus_config(slave, &bus->params);
- if (ret < 0) {
- dev_err(bus->dev, "Notify Slave: %d failed\n",
- slave->dev_num);
- return ret;
- }
- }
- }
- return ret;
- }
- /**
- * sdw_program_params() - Program transport and port parameters for Master(s)
- * and Slave(s)
- *
- * @bus: SDW bus instance
- * @prepare: true if sdw_program_params() is called by _prepare.
- */
- static int sdw_program_params(struct sdw_bus *bus, bool prepare)
- {
- struct sdw_master_runtime *m_rt;
- int ret = 0;
- list_for_each_entry(m_rt, &bus->m_rt_list, bus_node) {
- /*
- * this loop walks through all master runtimes for a
- * bus, but the ports can only be configured while
- * explicitly preparing a stream or handling an
- * already-prepared stream otherwise.
- */
- if (!prepare &&
- m_rt->stream->state == SDW_STREAM_CONFIGURED)
- continue;
- ret = sdw_program_port_params(m_rt);
- if (ret < 0) {
- dev_err(bus->dev,
- "Program transport params failed: %d\n", ret);
- return ret;
- }
- ret = sdw_notify_config(m_rt);
- if (ret < 0) {
- dev_err(bus->dev,
- "Notify bus config failed: %d\n", ret);
- return ret;
- }
- /* Enable port(s) on alternate bank for all active streams */
- if (m_rt->stream->state != SDW_STREAM_ENABLED)
- continue;
- ret = sdw_enable_disable_ports(m_rt, true);
- if (ret < 0) {
- dev_err(bus->dev, "Enable channel failed: %d\n", ret);
- return ret;
- }
- }
- return ret;
- }
- static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
- {
- int col_index, row_index;
- bool multi_link;
- struct sdw_msg *wr_msg;
- u8 *wbuf;
- int ret;
- u16 addr;
- wr_msg = kzalloc(sizeof(*wr_msg), GFP_KERNEL);
- if (!wr_msg)
- return -ENOMEM;
- bus->defer_msg.msg = wr_msg;
- wbuf = kzalloc(sizeof(*wbuf), GFP_KERNEL);
- if (!wbuf) {
- ret = -ENOMEM;
- goto error_1;
- }
- /* Get row and column index to program register */
- col_index = sdw_find_col_index(bus->params.col);
- row_index = sdw_find_row_index(bus->params.row);
- wbuf[0] = col_index | (row_index << 3);
- if (bus->params.next_bank)
- addr = SDW_SCP_FRAMECTRL_B1;
- else
- addr = SDW_SCP_FRAMECTRL_B0;
- sdw_fill_msg(wr_msg, NULL, addr, 1, SDW_BROADCAST_DEV_NUM,
- SDW_MSG_FLAG_WRITE, wbuf);
- wr_msg->ssp_sync = true;
- /*
- * Set the multi_link flag only when both the hardware supports
- * and hardware-based sync is required
- */
- multi_link = bus->multi_link && (m_rt_count >= bus->hw_sync_min_links);
- if (multi_link)
- ret = sdw_transfer_defer(bus, wr_msg, &bus->defer_msg);
- else
- ret = sdw_transfer(bus, wr_msg);
- if (ret < 0) {
- dev_err(bus->dev, "Slave frame_ctrl reg write failed\n");
- goto error;
- }
- if (!multi_link) {
- kfree(wr_msg);
- kfree(wbuf);
- bus->defer_msg.msg = NULL;
- bus->params.curr_bank = !bus->params.curr_bank;
- bus->params.next_bank = !bus->params.next_bank;
- }
- return 0;
- error:
- kfree(wbuf);
- error_1:
- kfree(wr_msg);
- bus->defer_msg.msg = NULL;
- return ret;
- }
- /**
- * sdw_ml_sync_bank_switch: Multilink register bank switch
- *
- * @bus: SDW bus instance
- *
- * Caller function should free the buffers on error
- */
- static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
- {
- unsigned long time_left;
- if (!bus->multi_link)
- return 0;
- /* Wait for completion of transfer */
- time_left = wait_for_completion_timeout(&bus->defer_msg.complete,
- bus->bank_switch_timeout);
- if (!time_left) {
- dev_err(bus->dev, "Controller Timed out on bank switch\n");
- return -ETIMEDOUT;
- }
- bus->params.curr_bank = !bus->params.curr_bank;
- bus->params.next_bank = !bus->params.next_bank;
- if (bus->defer_msg.msg) {
- kfree(bus->defer_msg.msg->buf);
- kfree(bus->defer_msg.msg);
- }
- return 0;
- }
- static int do_bank_switch(struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt;
- const struct sdw_master_ops *ops;
- struct sdw_bus *bus;
- bool multi_link = false;
- int m_rt_count;
- int ret = 0;
- m_rt_count = stream->m_rt_count;
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- ops = bus->ops;
- if (bus->multi_link && m_rt_count >= bus->hw_sync_min_links) {
- multi_link = true;
- mutex_lock(&bus->msg_lock);
- }
- /* Pre-bank switch */
- if (ops->pre_bank_switch) {
- ret = ops->pre_bank_switch(bus);
- if (ret < 0) {
- dev_err(bus->dev,
- "Pre bank switch op failed: %d\n", ret);
- goto msg_unlock;
- }
- }
- /*
- * Perform Bank switch operation.
- * For multi link cases, the actual bank switch is
- * synchronized across all Masters and happens later as a
- * part of post_bank_switch ops.
- */
- ret = sdw_bank_switch(bus, m_rt_count);
- if (ret < 0) {
- dev_err(bus->dev, "Bank switch failed: %d\n", ret);
- goto error;
- }
- }
- /*
- * For multi link cases, it is expected that the bank switch is
- * triggered by the post_bank_switch for the first Master in the list
- * and for the other Masters the post_bank_switch() should return doing
- * nothing.
- */
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- ops = bus->ops;
- /* Post-bank switch */
- if (ops->post_bank_switch) {
- ret = ops->post_bank_switch(bus);
- if (ret < 0) {
- dev_err(bus->dev,
- "Post bank switch op failed: %d\n",
- ret);
- goto error;
- }
- } else if (multi_link) {
- dev_err(bus->dev,
- "Post bank switch ops not implemented\n");
- goto error;
- }
- /* Set the bank switch timeout to default, if not set */
- if (!bus->bank_switch_timeout)
- bus->bank_switch_timeout = DEFAULT_BANK_SWITCH_TIMEOUT;
- /* Check if bank switch was successful */
- ret = sdw_ml_sync_bank_switch(bus);
- if (ret < 0) {
- dev_err(bus->dev,
- "multi link bank switch failed: %d\n", ret);
- goto error;
- }
- if (multi_link)
- mutex_unlock(&bus->msg_lock);
- }
- return ret;
- error:
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- if (bus->defer_msg.msg) {
- kfree(bus->defer_msg.msg->buf);
- kfree(bus->defer_msg.msg);
- }
- }
- msg_unlock:
- if (multi_link) {
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- if (mutex_is_locked(&bus->msg_lock))
- mutex_unlock(&bus->msg_lock);
- }
- }
- return ret;
- }
- /**
- * sdw_release_stream() - Free the assigned stream runtime
- *
- * @stream: SoundWire stream runtime
- *
- * sdw_release_stream should be called only once per stream
- */
- void sdw_release_stream(struct sdw_stream_runtime *stream)
- {
- kfree(stream);
- }
- EXPORT_SYMBOL(sdw_release_stream);
- /**
- * sdw_alloc_stream() - Allocate and return stream runtime
- *
- * @stream_name: SoundWire stream name
- *
- * Allocates a SoundWire stream runtime instance.
- * sdw_alloc_stream should be called only once per stream. Typically
- * invoked from ALSA/ASoC machine/platform driver.
- */
- struct sdw_stream_runtime *sdw_alloc_stream(const char *stream_name)
- {
- struct sdw_stream_runtime *stream;
- stream = kzalloc(sizeof(*stream), GFP_KERNEL);
- if (!stream)
- return NULL;
- stream->name = stream_name;
- INIT_LIST_HEAD(&stream->master_list);
- stream->state = SDW_STREAM_ALLOCATED;
- stream->m_rt_count = 0;
- return stream;
- }
- EXPORT_SYMBOL(sdw_alloc_stream);
- static struct sdw_master_runtime
- *sdw_find_master_rt(struct sdw_bus *bus,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt;
- /* Retrieve Bus handle if already available */
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- if (m_rt->bus == bus)
- return m_rt;
- }
- return NULL;
- }
- /**
- * sdw_alloc_master_rt() - Allocates and initialize Master runtime handle
- *
- * @bus: SDW bus instance
- * @stream_config: Stream configuration
- * @stream: Stream runtime handle.
- *
- * This function is to be called with bus_lock held.
- */
- static struct sdw_master_runtime
- *sdw_alloc_master_rt(struct sdw_bus *bus,
- struct sdw_stream_config *stream_config,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt;
- /*
- * check if Master is already allocated (as a result of Slave adding
- * it first), if so skip allocation and go to configure
- */
- m_rt = sdw_find_master_rt(bus, stream);
- if (m_rt)
- goto stream_config;
- m_rt = kzalloc(sizeof(*m_rt), GFP_KERNEL);
- if (!m_rt)
- return NULL;
- /* Initialization of Master runtime handle */
- INIT_LIST_HEAD(&m_rt->port_list);
- INIT_LIST_HEAD(&m_rt->slave_rt_list);
- list_add_tail(&m_rt->stream_node, &stream->master_list);
- list_add_tail(&m_rt->bus_node, &bus->m_rt_list);
- stream_config:
- m_rt->ch_count = stream_config->ch_count;
- m_rt->bus = bus;
- m_rt->stream = stream;
- m_rt->direction = stream_config->direction;
- return m_rt;
- }
- /**
- * sdw_alloc_slave_rt() - Allocate and initialize Slave runtime handle.
- *
- * @slave: Slave handle
- * @stream_config: Stream configuration
- * @stream: Stream runtime handle
- *
- * This function is to be called with bus_lock held.
- */
- static struct sdw_slave_runtime
- *sdw_alloc_slave_rt(struct sdw_slave *slave,
- struct sdw_stream_config *stream_config,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_slave_runtime *s_rt;
- s_rt = kzalloc(sizeof(*s_rt), GFP_KERNEL);
- if (!s_rt)
- return NULL;
- INIT_LIST_HEAD(&s_rt->port_list);
- s_rt->ch_count = stream_config->ch_count;
- s_rt->direction = stream_config->direction;
- s_rt->slave = slave;
- return s_rt;
- }
- static void sdw_master_port_release(struct sdw_bus *bus,
- struct sdw_master_runtime *m_rt)
- {
- struct sdw_port_runtime *p_rt, *_p_rt;
- list_for_each_entry_safe(p_rt, _p_rt, &m_rt->port_list, port_node) {
- list_del(&p_rt->port_node);
- kfree(p_rt);
- }
- }
- static void sdw_slave_port_release(struct sdw_bus *bus,
- struct sdw_slave *slave,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_port_runtime *p_rt, *_p_rt;
- struct sdw_master_runtime *m_rt;
- struct sdw_slave_runtime *s_rt;
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- list_for_each_entry(s_rt, &m_rt->slave_rt_list, m_rt_node) {
- if (s_rt->slave != slave)
- continue;
- list_for_each_entry_safe(p_rt, _p_rt,
- &s_rt->port_list, port_node) {
- list_del(&p_rt->port_node);
- kfree(p_rt);
- }
- }
- }
- }
- /**
- * sdw_release_slave_stream() - Free Slave(s) runtime handle
- *
- * @slave: Slave handle.
- * @stream: Stream runtime handle.
- *
- * This function is to be called with bus_lock held.
- */
- static void sdw_release_slave_stream(struct sdw_slave *slave,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_slave_runtime *s_rt, *_s_rt;
- struct sdw_master_runtime *m_rt;
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- /* Retrieve Slave runtime handle */
- list_for_each_entry_safe(s_rt, _s_rt,
- &m_rt->slave_rt_list, m_rt_node) {
- if (s_rt->slave == slave) {
- list_del(&s_rt->m_rt_node);
- kfree(s_rt);
- return;
- }
- }
- }
- }
- /**
- * sdw_release_master_stream() - Free Master runtime handle
- *
- * @m_rt: Master runtime node
- * @stream: Stream runtime handle.
- *
- * This function is to be called with bus_lock held
- * It frees the Master runtime handle and associated Slave(s) runtime
- * handle. If this is called first then sdw_release_slave_stream() will have
- * no effect as Slave(s) runtime handle would already be freed up.
- */
- static void sdw_release_master_stream(struct sdw_master_runtime *m_rt,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_slave_runtime *s_rt, *_s_rt;
- list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) {
- sdw_slave_port_release(s_rt->slave->bus, s_rt->slave, stream);
- sdw_release_slave_stream(s_rt->slave, stream);
- }
- list_del(&m_rt->stream_node);
- list_del(&m_rt->bus_node);
- kfree(m_rt);
- }
- /**
- * sdw_stream_remove_master() - Remove master from sdw_stream
- *
- * @bus: SDW Bus instance
- * @stream: SoundWire stream
- *
- * This removes and frees port_rt and master_rt from a stream
- */
- int sdw_stream_remove_master(struct sdw_bus *bus,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt, *_m_rt;
- mutex_lock(&bus->bus_lock);
- list_for_each_entry_safe(m_rt, _m_rt,
- &stream->master_list, stream_node) {
- if (m_rt->bus != bus)
- continue;
- sdw_master_port_release(bus, m_rt);
- sdw_release_master_stream(m_rt, stream);
- stream->m_rt_count--;
- }
- if (list_empty(&stream->master_list))
- stream->state = SDW_STREAM_RELEASED;
- mutex_unlock(&bus->bus_lock);
- return 0;
- }
- EXPORT_SYMBOL(sdw_stream_remove_master);
- /**
- * sdw_stream_remove_slave() - Remove slave from sdw_stream
- *
- * @slave: SDW Slave instance
- * @stream: SoundWire stream
- *
- * This removes and frees port_rt and slave_rt from a stream
- */
- int sdw_stream_remove_slave(struct sdw_slave *slave,
- struct sdw_stream_runtime *stream)
- {
- mutex_lock(&slave->bus->bus_lock);
- sdw_slave_port_release(slave->bus, slave, stream);
- sdw_release_slave_stream(slave, stream);
- mutex_unlock(&slave->bus->bus_lock);
- return 0;
- }
- EXPORT_SYMBOL(sdw_stream_remove_slave);
- /**
- * sdw_config_stream() - Configure the allocated stream
- *
- * @dev: SDW device
- * @stream: SoundWire stream
- * @stream_config: Stream configuration for audio stream
- * @is_slave: is API called from Slave or Master
- *
- * This function is to be called with bus_lock held.
- */
- static int sdw_config_stream(struct device *dev,
- struct sdw_stream_runtime *stream,
- struct sdw_stream_config *stream_config,
- bool is_slave)
- {
- /*
- * Update the stream rate, channel and bps based on data
- * source. For more than one data source (multilink),
- * match the rate, bps, stream type and increment number of channels.
- *
- * If rate/bps is zero, it means the values are not set, so skip
- * comparison and allow the value to be set and stored in stream
- */
- if (stream->params.rate &&
- stream->params.rate != stream_config->frame_rate) {
- dev_err(dev, "rate not matching, stream:%s\n", stream->name);
- return -EINVAL;
- }
- if (stream->params.bps &&
- stream->params.bps != stream_config->bps) {
- dev_err(dev, "bps not matching, stream:%s\n", stream->name);
- return -EINVAL;
- }
- stream->type = stream_config->type;
- stream->params.rate = stream_config->frame_rate;
- stream->params.bps = stream_config->bps;
- /* TODO: Update this check during Device-device support */
- if (is_slave)
- stream->params.ch_count += stream_config->ch_count;
- return 0;
- }
- static int sdw_is_valid_port_range(struct device *dev,
- struct sdw_port_runtime *p_rt)
- {
- if (!SDW_VALID_PORT_RANGE(p_rt->num)) {
- dev_err(dev,
- "SoundWire: Invalid port number :%d\n", p_rt->num);
- return -EINVAL;
- }
- return 0;
- }
- static struct sdw_port_runtime
- *sdw_port_alloc(struct device *dev,
- struct sdw_port_config *port_config,
- int port_index)
- {
- struct sdw_port_runtime *p_rt;
- p_rt = kzalloc(sizeof(*p_rt), GFP_KERNEL);
- if (!p_rt)
- return NULL;
- p_rt->ch_mask = port_config[port_index].ch_mask;
- p_rt->num = port_config[port_index].num;
- return p_rt;
- }
- static int sdw_master_port_config(struct sdw_bus *bus,
- struct sdw_master_runtime *m_rt,
- struct sdw_port_config *port_config,
- unsigned int num_ports)
- {
- struct sdw_port_runtime *p_rt;
- int i;
- /* Iterate for number of ports to perform initialization */
- for (i = 0; i < num_ports; i++) {
- p_rt = sdw_port_alloc(bus->dev, port_config, i);
- if (!p_rt)
- return -ENOMEM;
- /*
- * TODO: Check port capabilities for requested
- * configuration (audio mode support)
- */
- list_add_tail(&p_rt->port_node, &m_rt->port_list);
- }
- return 0;
- }
- static int sdw_slave_port_config(struct sdw_slave *slave,
- struct sdw_slave_runtime *s_rt,
- struct sdw_port_config *port_config,
- unsigned int num_config)
- {
- struct sdw_port_runtime *p_rt;
- int i, ret;
- /* Iterate for number of ports to perform initialization */
- for (i = 0; i < num_config; i++) {
- p_rt = sdw_port_alloc(&slave->dev, port_config, i);
- if (!p_rt)
- return -ENOMEM;
- /*
- * TODO: Check valid port range as defined by DisCo/
- * slave
- */
- ret = sdw_is_valid_port_range(&slave->dev, p_rt);
- if (ret < 0) {
- kfree(p_rt);
- return ret;
- }
- /*
- * TODO: Check port capabilities for requested
- * configuration (audio mode support)
- */
- list_add_tail(&p_rt->port_node, &s_rt->port_list);
- }
- return 0;
- }
- /**
- * sdw_stream_add_master() - Allocate and add master runtime to a stream
- *
- * @bus: SDW Bus instance
- * @stream_config: Stream configuration for audio stream
- * @port_config: Port configuration for audio stream
- * @num_ports: Number of ports
- * @stream: SoundWire stream
- */
- int sdw_stream_add_master(struct sdw_bus *bus,
- struct sdw_stream_config *stream_config,
- struct sdw_port_config *port_config,
- unsigned int num_ports,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt;
- int ret;
- mutex_lock(&bus->bus_lock);
- /*
- * For multi link streams, add the second master only if
- * the bus supports it.
- * Check if bus->multi_link is set
- */
- if (!bus->multi_link && stream->m_rt_count > 0) {
- dev_err(bus->dev,
- "Multilink not supported, link %d\n", bus->link_id);
- ret = -EINVAL;
- goto unlock;
- }
- m_rt = sdw_alloc_master_rt(bus, stream_config, stream);
- if (!m_rt) {
- dev_err(bus->dev,
- "Master runtime config failed for stream:%s\n",
- stream->name);
- ret = -ENOMEM;
- goto unlock;
- }
- ret = sdw_config_stream(bus->dev, stream, stream_config, false);
- if (ret)
- goto stream_error;
- ret = sdw_master_port_config(bus, m_rt, port_config, num_ports);
- if (ret)
- goto stream_error;
- stream->m_rt_count++;
- goto unlock;
- stream_error:
- sdw_release_master_stream(m_rt, stream);
- unlock:
- mutex_unlock(&bus->bus_lock);
- return ret;
- }
- EXPORT_SYMBOL(sdw_stream_add_master);
- /**
- * sdw_stream_add_slave() - Allocate and add master/slave runtime to a stream
- *
- * @slave: SDW Slave instance
- * @stream_config: Stream configuration for audio stream
- * @stream: SoundWire stream
- * @port_config: Port configuration for audio stream
- * @num_ports: Number of ports
- *
- * It is expected that Slave is added before adding Master
- * to the Stream.
- *
- */
- int sdw_stream_add_slave(struct sdw_slave *slave,
- struct sdw_stream_config *stream_config,
- struct sdw_port_config *port_config,
- unsigned int num_ports,
- struct sdw_stream_runtime *stream)
- {
- struct sdw_slave_runtime *s_rt;
- struct sdw_master_runtime *m_rt;
- int ret;
- mutex_lock(&slave->bus->bus_lock);
- /*
- * If this API is invoked by Slave first then m_rt is not valid.
- * So, allocate m_rt and add Slave to it.
- */
- m_rt = sdw_alloc_master_rt(slave->bus, stream_config, stream);
- if (!m_rt) {
- dev_err(&slave->dev,
- "alloc master runtime failed for stream:%s\n",
- stream->name);
- ret = -ENOMEM;
- goto error;
- }
- s_rt = sdw_alloc_slave_rt(slave, stream_config, stream);
- if (!s_rt) {
- dev_err(&slave->dev,
- "Slave runtime config failed for stream:%s\n",
- stream->name);
- ret = -ENOMEM;
- goto stream_error;
- }
- ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
- if (ret) {
- /*
- * sdw_release_master_stream will release s_rt in slave_rt_list in
- * stream_error case, but s_rt is only added to slave_rt_list
- * when sdw_config_stream is successful, so free s_rt explicitly
- * when sdw_config_stream is failed.
- */
- kfree(s_rt);
- goto stream_error;
- }
- list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);
- ret = sdw_slave_port_config(slave, s_rt, port_config, num_ports);
- if (ret)
- goto stream_error;
- /*
- * Change stream state to CONFIGURED on first Slave add.
- * Bus is not aware of number of Slave(s) in a stream at this
- * point so cannot depend on all Slave(s) to be added in order to
- * change stream state to CONFIGURED.
- */
- stream->state = SDW_STREAM_CONFIGURED;
- goto error;
- stream_error:
- /*
- * we hit error so cleanup the stream, release all Slave(s) and
- * Master runtime
- */
- sdw_release_master_stream(m_rt, stream);
- error:
- mutex_unlock(&slave->bus->bus_lock);
- return ret;
- }
- EXPORT_SYMBOL(sdw_stream_add_slave);
- /**
- * sdw_get_slave_dpn_prop() - Get Slave port capabilities
- *
- * @slave: Slave handle
- * @direction: Data direction.
- * @port_num: Port number
- */
- struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
- enum sdw_data_direction direction,
- unsigned int port_num)
- {
- struct sdw_dpn_prop *dpn_prop;
- u8 num_ports;
- int i;
- if (direction == SDW_DATA_DIR_TX) {
- num_ports = hweight32(slave->prop.source_ports);
- dpn_prop = slave->prop.src_dpn_prop;
- } else {
- num_ports = hweight32(slave->prop.sink_ports);
- dpn_prop = slave->prop.sink_dpn_prop;
- }
- for (i = 0; i < num_ports; i++) {
- if (dpn_prop[i].num == port_num)
- return &dpn_prop[i];
- }
- return NULL;
- }
- /**
- * sdw_acquire_bus_lock: Acquire bus lock for all Master runtime(s)
- *
- * @stream: SoundWire stream
- *
- * Acquire bus_lock for each of the master runtime(m_rt) part of this
- * stream to reconfigure the bus.
- * NOTE: This function is called from SoundWire stream ops and is
- * expected that a global lock is held before acquiring bus_lock.
- */
- static void sdw_acquire_bus_lock(struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt;
- struct sdw_bus *bus = NULL;
- /* Iterate for all Master(s) in Master list */
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- mutex_lock(&bus->bus_lock);
- }
- }
- /**
- * sdw_release_bus_lock: Release bus lock for all Master runtime(s)
- *
- * @stream: SoundWire stream
- *
- * Release the previously held bus_lock after reconfiguring the bus.
- * NOTE: This function is called from SoundWire stream ops and is
- * expected that a global lock is held before releasing bus_lock.
- */
- static void sdw_release_bus_lock(struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt = NULL;
- struct sdw_bus *bus = NULL;
- /* Iterate for all Master(s) in Master list */
- list_for_each_entry_reverse(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- mutex_unlock(&bus->bus_lock);
- }
- }
- static int _sdw_prepare_stream(struct sdw_stream_runtime *stream,
- bool update_params)
- {
- struct sdw_master_runtime *m_rt;
- struct sdw_bus *bus = NULL;
- struct sdw_master_prop *prop;
- struct sdw_bus_params params;
- int ret;
- /* Prepare Master(s) and Slave(s) port(s) associated with stream */
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- prop = &bus->prop;
- memcpy(¶ms, &bus->params, sizeof(params));
- /* TODO: Support Asynchronous mode */
- if ((prop->max_clk_freq % stream->params.rate) != 0) {
- dev_err(bus->dev, "Async mode not supported\n");
- return -EINVAL;
- }
- if (!update_params)
- goto program_params;
- /* Increment cumulative bus bandwidth */
- /* TODO: Update this during Device-Device support */
- bus->params.bandwidth += m_rt->stream->params.rate *
- m_rt->ch_count * m_rt->stream->params.bps;
- /* Compute params */
- if (bus->compute_params) {
- ret = bus->compute_params(bus);
- if (ret < 0) {
- dev_err(bus->dev, "Compute params failed: %d",
- ret);
- return ret;
- }
- }
- program_params:
- /* Program params */
- ret = sdw_program_params(bus, true);
- if (ret < 0) {
- dev_err(bus->dev, "Program params failed: %d\n", ret);
- goto restore_params;
- }
- }
- if (!bus) {
- pr_err("Configuration error in %s\n", __func__);
- return -EINVAL;
- }
- ret = do_bank_switch(stream);
- if (ret < 0) {
- dev_err(bus->dev, "Bank switch failed: %d\n", ret);
- goto restore_params;
- }
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- /* Prepare port(s) on the new clock configuration */
- ret = sdw_prep_deprep_ports(m_rt, true);
- if (ret < 0) {
- dev_err(bus->dev, "Prepare port(s) failed ret = %d\n",
- ret);
- return ret;
- }
- }
- stream->state = SDW_STREAM_PREPARED;
- return ret;
- restore_params:
- memcpy(&bus->params, ¶ms, sizeof(params));
- return ret;
- }
- /**
- * sdw_prepare_stream() - Prepare SoundWire stream
- *
- * @stream: Soundwire stream
- *
- * Documentation/driver-api/soundwire/stream.rst explains this API in detail
- */
- int sdw_prepare_stream(struct sdw_stream_runtime *stream)
- {
- bool update_params = true;
- int ret;
- if (!stream) {
- pr_err("SoundWire: Handle not found for stream\n");
- return -EINVAL;
- }
- sdw_acquire_bus_lock(stream);
- if (stream->state == SDW_STREAM_PREPARED) {
- ret = 0;
- goto state_err;
- }
- if (stream->state != SDW_STREAM_CONFIGURED &&
- stream->state != SDW_STREAM_DEPREPARED &&
- stream->state != SDW_STREAM_DISABLED) {
- pr_err("%s: %s: inconsistent state state %d\n",
- __func__, stream->name, stream->state);
- ret = -EINVAL;
- goto state_err;
- }
- /*
- * when the stream is DISABLED, this means sdw_prepare_stream()
- * is called as a result of an underflow or a resume operation.
- * In this case, the bus parameters shall not be recomputed, but
- * still need to be re-applied
- */
- if (stream->state == SDW_STREAM_DISABLED)
- update_params = false;
- ret = _sdw_prepare_stream(stream, update_params);
- state_err:
- sdw_release_bus_lock(stream);
- return ret;
- }
- EXPORT_SYMBOL(sdw_prepare_stream);
- static int _sdw_enable_stream(struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt;
- struct sdw_bus *bus = NULL;
- int ret;
- /* Enable Master(s) and Slave(s) port(s) associated with stream */
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- /* Program params */
- ret = sdw_program_params(bus, false);
- if (ret < 0) {
- dev_err(bus->dev, "Program params failed: %d\n", ret);
- return ret;
- }
- /* Enable port(s) */
- ret = sdw_enable_disable_ports(m_rt, true);
- if (ret < 0) {
- dev_err(bus->dev,
- "Enable port(s) failed ret: %d\n", ret);
- return ret;
- }
- }
- if (!bus) {
- pr_err("Configuration error in %s\n", __func__);
- return -EINVAL;
- }
- ret = do_bank_switch(stream);
- if (ret < 0) {
- dev_err(bus->dev, "Bank switch failed: %d\n", ret);
- return ret;
- }
- stream->state = SDW_STREAM_ENABLED;
- return 0;
- }
- /**
- * sdw_enable_stream() - Enable SoundWire stream
- *
- * @stream: Soundwire stream
- *
- * Documentation/driver-api/soundwire/stream.rst explains this API in detail
- */
- int sdw_enable_stream(struct sdw_stream_runtime *stream)
- {
- int ret;
- if (!stream) {
- pr_err("SoundWire: Handle not found for stream\n");
- return -EINVAL;
- }
- sdw_acquire_bus_lock(stream);
- if (stream->state != SDW_STREAM_PREPARED &&
- stream->state != SDW_STREAM_DISABLED) {
- pr_err("%s: %s: inconsistent state state %d\n",
- __func__, stream->name, stream->state);
- ret = -EINVAL;
- goto state_err;
- }
- ret = _sdw_enable_stream(stream);
- state_err:
- sdw_release_bus_lock(stream);
- return ret;
- }
- EXPORT_SYMBOL(sdw_enable_stream);
- static int _sdw_disable_stream(struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt;
- int ret;
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- struct sdw_bus *bus = m_rt->bus;
- /* Disable port(s) */
- ret = sdw_enable_disable_ports(m_rt, false);
- if (ret < 0) {
- dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
- return ret;
- }
- }
- stream->state = SDW_STREAM_DISABLED;
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- struct sdw_bus *bus = m_rt->bus;
- /* Program params */
- ret = sdw_program_params(bus, false);
- if (ret < 0) {
- dev_err(bus->dev, "Program params failed: %d\n", ret);
- return ret;
- }
- }
- ret = do_bank_switch(stream);
- if (ret < 0) {
- pr_err("Bank switch failed: %d\n", ret);
- return ret;
- }
- /* make sure alternate bank (previous current) is also disabled */
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- struct sdw_bus *bus = m_rt->bus;
- /* Disable port(s) */
- ret = sdw_enable_disable_ports(m_rt, false);
- if (ret < 0) {
- dev_err(bus->dev, "Disable port(s) failed: %d\n", ret);
- return ret;
- }
- }
- return 0;
- }
- /**
- * sdw_disable_stream() - Disable SoundWire stream
- *
- * @stream: Soundwire stream
- *
- * Documentation/driver-api/soundwire/stream.rst explains this API in detail
- */
- int sdw_disable_stream(struct sdw_stream_runtime *stream)
- {
- int ret;
- if (!stream) {
- pr_err("SoundWire: Handle not found for stream\n");
- return -EINVAL;
- }
- sdw_acquire_bus_lock(stream);
- if (stream->state != SDW_STREAM_ENABLED) {
- pr_err("%s: %s: inconsistent state state %d\n",
- __func__, stream->name, stream->state);
- ret = -EINVAL;
- goto state_err;
- }
- ret = _sdw_disable_stream(stream);
- state_err:
- sdw_release_bus_lock(stream);
- return ret;
- }
- EXPORT_SYMBOL(sdw_disable_stream);
- static int _sdw_deprepare_stream(struct sdw_stream_runtime *stream)
- {
- struct sdw_master_runtime *m_rt;
- struct sdw_bus *bus;
- int ret = 0;
- list_for_each_entry(m_rt, &stream->master_list, stream_node) {
- bus = m_rt->bus;
- /* De-prepare port(s) */
- ret = sdw_prep_deprep_ports(m_rt, false);
- if (ret < 0) {
- dev_err(bus->dev,
- "De-prepare port(s) failed: %d\n", ret);
- return ret;
- }
- /* TODO: Update this during Device-Device support */
- bus->params.bandwidth -= m_rt->stream->params.rate *
- m_rt->ch_count * m_rt->stream->params.bps;
- /* Compute params */
- if (bus->compute_params) {
- ret = bus->compute_params(bus);
- if (ret < 0) {
- dev_err(bus->dev, "Compute params failed: %d",
- ret);
- return ret;
- }
- }
- /* Program params */
- ret = sdw_program_params(bus, false);
- if (ret < 0) {
- dev_err(bus->dev, "Program params failed: %d\n", ret);
- return ret;
- }
- }
- stream->state = SDW_STREAM_DEPREPARED;
- return do_bank_switch(stream);
- }
- /**
- * sdw_deprepare_stream() - Deprepare SoundWire stream
- *
- * @stream: Soundwire stream
- *
- * Documentation/driver-api/soundwire/stream.rst explains this API in detail
- */
- int sdw_deprepare_stream(struct sdw_stream_runtime *stream)
- {
- int ret;
- if (!stream) {
- pr_err("SoundWire: Handle not found for stream\n");
- return -EINVAL;
- }
- sdw_acquire_bus_lock(stream);
- if (stream->state != SDW_STREAM_PREPARED &&
- stream->state != SDW_STREAM_DISABLED) {
- pr_err("%s: %s: inconsistent state state %d\n",
- __func__, stream->name, stream->state);
- ret = -EINVAL;
- goto state_err;
- }
- ret = _sdw_deprepare_stream(stream);
- state_err:
- sdw_release_bus_lock(stream);
- return ret;
- }
- EXPORT_SYMBOL(sdw_deprepare_stream);
- static int set_stream(struct snd_pcm_substream *substream,
- struct sdw_stream_runtime *sdw_stream)
- {
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct snd_soc_dai *dai;
- int ret = 0;
- int i;
- /* Set stream pointer on all DAIs */
- for_each_rtd_dais(rtd, i, dai) {
- ret = snd_soc_dai_set_sdw_stream(dai, sdw_stream, substream->stream);
- if (ret < 0) {
- dev_err(rtd->dev, "failed to set stream pointer on dai %s", dai->name);
- break;
- }
- }
- return ret;
- }
- /**
- * sdw_startup_stream() - Startup SoundWire stream
- *
- * @sdw_substream: Soundwire stream
- *
- * Documentation/driver-api/soundwire/stream.rst explains this API in detail
- */
- int sdw_startup_stream(void *sdw_substream)
- {
- struct snd_pcm_substream *substream = sdw_substream;
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct sdw_stream_runtime *sdw_stream;
- char *name;
- int ret;
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- name = kasprintf(GFP_KERNEL, "%s-Playback", substream->name);
- else
- name = kasprintf(GFP_KERNEL, "%s-Capture", substream->name);
- if (!name)
- return -ENOMEM;
- sdw_stream = sdw_alloc_stream(name);
- if (!sdw_stream) {
- dev_err(rtd->dev, "alloc stream failed for substream DAI %s", substream->name);
- ret = -ENOMEM;
- goto error;
- }
- ret = set_stream(substream, sdw_stream);
- if (ret < 0)
- goto release_stream;
- return 0;
- release_stream:
- sdw_release_stream(sdw_stream);
- set_stream(substream, NULL);
- error:
- kfree(name);
- return ret;
- }
- EXPORT_SYMBOL(sdw_startup_stream);
- /**
- * sdw_shutdown_stream() - Shutdown SoundWire stream
- *
- * @sdw_substream: Soundwire stream
- *
- * Documentation/driver-api/soundwire/stream.rst explains this API in detail
- */
- void sdw_shutdown_stream(void *sdw_substream)
- {
- struct snd_pcm_substream *substream = sdw_substream;
- struct snd_soc_pcm_runtime *rtd = substream->private_data;
- struct sdw_stream_runtime *sdw_stream;
- struct snd_soc_dai *dai;
- /* Find stream from first CPU DAI */
- dai = asoc_rtd_to_cpu(rtd, 0);
- sdw_stream = snd_soc_dai_get_sdw_stream(dai, substream->stream);
- if (IS_ERR(sdw_stream)) {
- dev_err(rtd->dev, "no stream found for DAI %s", dai->name);
- return;
- }
- /* release memory */
- kfree(sdw_stream->name);
- sdw_release_stream(sdw_stream);
- /* clear DAI data */
- set_stream(substream, NULL);
- }
- EXPORT_SYMBOL(sdw_shutdown_stream);
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