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- // SPDX-License-Identifier: GPL-2.0
- /*
- * MIPI DSI Bus
- *
- * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
- * Copyright (C) 2019 STMicroelectronics - All Rights Reserved
- * Andrzej Hajda <a.hajda@samsung.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * Mipi_dsi.c contains a set of dsi helpers.
- * This file is inspired from the drm helper file drivers/gpu/drm/drm_mipi_dsi.c
- * (kernel linux).
- *
- */
- #include <common.h>
- #include <clk.h>
- #include <display.h>
- #include <dm.h>
- #include <mipi_display.h>
- #include <mipi_dsi.h>
- #include <dm/devres.h>
- /**
- * DOC: dsi helpers
- *
- * These functions contain some common logic and helpers to deal with MIPI DSI
- * peripherals.
- *
- * Helpers are provided for a number of standard MIPI DSI command as well as a
- * subset of the MIPI DCS command set.
- */
- /**
- * mipi_dsi_attach - attach a DSI device to its DSI host
- * @dsi: DSI peripheral
- */
- int mipi_dsi_attach(struct mipi_dsi_device *dsi)
- {
- const struct mipi_dsi_host_ops *ops = dsi->host->ops;
- if (!ops || !ops->attach)
- return -ENOSYS;
- return ops->attach(dsi->host, dsi);
- }
- EXPORT_SYMBOL(mipi_dsi_attach);
- /**
- * mipi_dsi_detach - detach a DSI device from its DSI host
- * @dsi: DSI peripheral
- */
- int mipi_dsi_detach(struct mipi_dsi_device *dsi)
- {
- const struct mipi_dsi_host_ops *ops = dsi->host->ops;
- if (!ops || !ops->detach)
- return -ENOSYS;
- return ops->detach(dsi->host, dsi);
- }
- EXPORT_SYMBOL(mipi_dsi_detach);
- /**
- * mipi_dsi_device_transfer - transfer message to a DSI device
- * @dsi: DSI peripheral
- * @msg: message
- */
- static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi,
- struct mipi_dsi_msg *msg)
- {
- const struct mipi_dsi_host_ops *ops = dsi->host->ops;
- if (!ops || !ops->transfer)
- return -ENOSYS;
- if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
- msg->flags |= MIPI_DSI_MSG_USE_LPM;
- return ops->transfer(dsi->host, msg);
- }
- /**
- * mipi_dsi_packet_format_is_short - check if a packet is of the short format
- * @type: MIPI DSI data type of the packet
- *
- * Return: true if the packet for the given data type is a short packet, false
- * otherwise.
- */
- bool mipi_dsi_packet_format_is_short(u8 type)
- {
- switch (type) {
- case MIPI_DSI_V_SYNC_START:
- case MIPI_DSI_V_SYNC_END:
- case MIPI_DSI_H_SYNC_START:
- case MIPI_DSI_H_SYNC_END:
- case MIPI_DSI_END_OF_TRANSMISSION:
- case MIPI_DSI_COLOR_MODE_OFF:
- case MIPI_DSI_COLOR_MODE_ON:
- case MIPI_DSI_SHUTDOWN_PERIPHERAL:
- case MIPI_DSI_TURN_ON_PERIPHERAL:
- case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
- case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
- case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM:
- case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
- case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
- case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
- case MIPI_DSI_DCS_SHORT_WRITE:
- case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
- case MIPI_DSI_DCS_READ:
- case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE:
- return true;
- }
- return false;
- }
- EXPORT_SYMBOL(mipi_dsi_packet_format_is_short);
- /**
- * mipi_dsi_packet_format_is_long - check if a packet is of the long format
- * @type: MIPI DSI data type of the packet
- *
- * Return: true if the packet for the given data type is a long packet, false
- * otherwise.
- */
- bool mipi_dsi_packet_format_is_long(u8 type)
- {
- switch (type) {
- case MIPI_DSI_NULL_PACKET:
- case MIPI_DSI_BLANKING_PACKET:
- case MIPI_DSI_GENERIC_LONG_WRITE:
- case MIPI_DSI_DCS_LONG_WRITE:
- case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20:
- case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24:
- case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16:
- case MIPI_DSI_PACKED_PIXEL_STREAM_30:
- case MIPI_DSI_PACKED_PIXEL_STREAM_36:
- case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12:
- case MIPI_DSI_PACKED_PIXEL_STREAM_16:
- case MIPI_DSI_PACKED_PIXEL_STREAM_18:
- case MIPI_DSI_PIXEL_STREAM_3BYTE_18:
- case MIPI_DSI_PACKED_PIXEL_STREAM_24:
- return true;
- }
- return false;
- }
- EXPORT_SYMBOL(mipi_dsi_packet_format_is_long);
- /**
- * mipi_dsi_create_packet - create a packet from a message according to the
- * DSI protocol
- * @packet: pointer to a DSI packet structure
- * @msg: message to translate into a packet
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
- const struct mipi_dsi_msg *msg)
- {
- if (!packet || !msg)
- return -EINVAL;
- /* do some minimum sanity checking */
- if (!mipi_dsi_packet_format_is_short(msg->type) &&
- !mipi_dsi_packet_format_is_long(msg->type))
- return -EINVAL;
- if (msg->channel > 3)
- return -EINVAL;
- memset(packet, 0, sizeof(*packet));
- packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f);
- /* TODO: compute ECC if hardware support is not available */
- /*
- * Long write packets contain the word count in header bytes 1 and 2.
- * The payload follows the header and is word count bytes long.
- *
- * Short write packets encode up to two parameters in header bytes 1
- * and 2.
- */
- if (mipi_dsi_packet_format_is_long(msg->type)) {
- packet->header[1] = (msg->tx_len >> 0) & 0xff;
- packet->header[2] = (msg->tx_len >> 8) & 0xff;
- packet->payload_length = msg->tx_len;
- packet->payload = msg->tx_buf;
- } else {
- const u8 *tx = msg->tx_buf;
- packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0;
- packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0;
- }
- packet->size = sizeof(packet->header) + packet->payload_length;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_create_packet);
- /**
- * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi)
- {
- struct mipi_dsi_msg msg = {
- .channel = dsi->channel,
- .type = MIPI_DSI_SHUTDOWN_PERIPHERAL,
- .tx_buf = (u8 [2]) { 0, 0 },
- .tx_len = 2,
- };
- int ret = mipi_dsi_device_transfer(dsi, &msg);
- return (ret < 0) ? ret : 0;
- }
- EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral);
- /**
- * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi)
- {
- struct mipi_dsi_msg msg = {
- .channel = dsi->channel,
- .type = MIPI_DSI_TURN_ON_PERIPHERAL,
- .tx_buf = (u8 [2]) { 0, 0 },
- .tx_len = 2,
- };
- int ret = mipi_dsi_device_transfer(dsi, &msg);
- return (ret < 0) ? ret : 0;
- }
- EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral);
- /*
- * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
- * the payload in a long packet transmitted from the peripheral back to the
- * host processor
- * @dsi: DSI peripheral device
- * @value: the maximum size of the payload
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
- u16 value)
- {
- u8 tx[2] = { value & 0xff, value >> 8 };
- struct mipi_dsi_msg msg = {
- .channel = dsi->channel,
- .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
- .tx_len = sizeof(tx),
- .tx_buf = tx,
- };
- int ret = mipi_dsi_device_transfer(dsi, &msg);
- return (ret < 0) ? ret : 0;
- }
- EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
- /**
- * mipi_dsi_generic_write() - transmit data using a generic write packet
- * @dsi: DSI peripheral device
- * @payload: buffer containing the payload
- * @size: size of payload buffer
- *
- * This function will automatically choose the right data type depending on
- * the payload length.
- *
- * Return: The number of bytes transmitted on success or a negative error code
- * on failure.
- */
- ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
- size_t size)
- {
- struct mipi_dsi_msg msg = {
- .channel = dsi->channel,
- .tx_buf = payload,
- .tx_len = size
- };
- switch (size) {
- case 0:
- msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
- break;
- case 1:
- msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
- break;
- case 2:
- msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
- break;
- default:
- msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
- break;
- }
- return mipi_dsi_device_transfer(dsi, &msg);
- }
- EXPORT_SYMBOL(mipi_dsi_generic_write);
- /**
- * mipi_dsi_generic_read() - receive data using a generic read packet
- * @dsi: DSI peripheral device
- * @params: buffer containing the request parameters
- * @num_params: number of request parameters
- * @data: buffer in which to return the received data
- * @size: size of receive buffer
- *
- * This function will automatically choose the right data type depending on
- * the number of parameters passed in.
- *
- * Return: The number of bytes successfully read or a negative error code on
- * failure.
- */
- ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
- size_t num_params, void *data, size_t size)
- {
- struct mipi_dsi_msg msg = {
- .channel = dsi->channel,
- .tx_len = num_params,
- .tx_buf = params,
- .rx_len = size,
- .rx_buf = data
- };
- switch (num_params) {
- case 0:
- msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
- break;
- case 1:
- msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
- break;
- case 2:
- msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
- break;
- default:
- return -EINVAL;
- }
- return mipi_dsi_device_transfer(dsi, &msg);
- }
- EXPORT_SYMBOL(mipi_dsi_generic_read);
- /**
- * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
- * @dsi: DSI peripheral device
- * @data: buffer containing data to be transmitted
- * @len: size of transmission buffer
- *
- * This function will automatically choose the right data type depending on
- * the command payload length.
- *
- * Return: The number of bytes successfully transmitted or a negative error
- * code on failure.
- */
- ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
- const void *data, size_t len)
- {
- struct mipi_dsi_msg msg = {
- .channel = dsi->channel,
- .tx_buf = data,
- .tx_len = len
- };
- switch (len) {
- case 0:
- return -EINVAL;
- case 1:
- msg.type = MIPI_DSI_DCS_SHORT_WRITE;
- break;
- case 2:
- msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM;
- break;
- default:
- msg.type = MIPI_DSI_DCS_LONG_WRITE;
- break;
- }
- return mipi_dsi_device_transfer(dsi, &msg);
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer);
- /**
- * mipi_dsi_dcs_write() - send DCS write command
- * @dsi: DSI peripheral device
- * @cmd: DCS command
- * @data: buffer containing the command payload
- * @len: command payload length
- *
- * This function will automatically choose the right data type depending on
- * the command payload length.
- *
- * Return: The number of bytes successfully transmitted or a negative error
- * code on failure.
- */
- ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
- const void *data, size_t len)
- {
- ssize_t err;
- size_t size;
- u8 *tx;
- if (len > 0) {
- size = 1 + len;
- tx = kmalloc(size, GFP_KERNEL);
- if (!tx)
- return -ENOMEM;
- /* concatenate the DCS command byte and the payload */
- tx[0] = cmd;
- memcpy(&tx[1], data, len);
- } else {
- tx = &cmd;
- size = 1;
- }
- err = mipi_dsi_dcs_write_buffer(dsi, tx, size);
- if (len > 0)
- kfree(tx);
- return err;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_write);
- /**
- * mipi_dsi_dcs_read() - send DCS read request command
- * @dsi: DSI peripheral device
- * @cmd: DCS command
- * @data: buffer in which to receive data
- * @len: size of receive buffer
- *
- * Return: The number of bytes read or a negative error code on failure.
- */
- ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
- size_t len)
- {
- struct mipi_dsi_msg msg = {
- .channel = dsi->channel,
- .type = MIPI_DSI_DCS_READ,
- .tx_buf = &cmd,
- .tx_len = 1,
- .rx_buf = data,
- .rx_len = len
- };
- return mipi_dsi_device_transfer(dsi, &msg);
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_read);
- /**
- * mipi_dsi_dcs_nop() - send DCS nop packet
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi)
- {
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0);
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_nop);
- /**
- * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi)
- {
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0);
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset);
- /**
- * mipi_dsi_dcs_get_power_mode() - query the display module's current power
- * mode
- * @dsi: DSI peripheral device
- * @mode: return location for the current power mode
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode)
- {
- ssize_t err;
- err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode,
- sizeof(*mode));
- if (err <= 0) {
- if (err == 0)
- err = -ENODATA;
- return err;
- }
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode);
- /**
- * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image
- * data used by the interface
- * @dsi: DSI peripheral device
- * @format: return location for the pixel format
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format)
- {
- ssize_t err;
- err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format,
- sizeof(*format));
- if (err <= 0) {
- if (err == 0)
- err = -ENODATA;
- return err;
- }
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format);
- /**
- * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the
- * display module except interface communication
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi)
- {
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode);
- /**
- * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display
- * module
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi)
- {
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0);
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode);
- /**
- * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the
- * display device
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi)
- {
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off);
- /**
- * mipi_dsi_dcs_set_display_on() - start displaying the image data on the
- * display device
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure
- */
- int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi)
- {
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0);
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on);
- /**
- * mipi_dsi_dcs_set_column_address() - define the column extent of the frame
- * memory accessed by the host processor
- * @dsi: DSI peripheral device
- * @start: first column of frame memory
- * @end: last column of frame memory
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
- u16 end)
- {
- u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload,
- sizeof(payload));
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address);
- /**
- * mipi_dsi_dcs_set_page_address() - define the page extent of the frame
- * memory accessed by the host processor
- * @dsi: DSI peripheral device
- * @start: first page of frame memory
- * @end: last page of frame memory
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
- u16 end)
- {
- u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff };
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload,
- sizeof(payload));
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address);
- /**
- * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect
- * output signal on the TE signal line
- * @dsi: DSI peripheral device
- *
- * Return: 0 on success or a negative error code on failure
- */
- int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi)
- {
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0);
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off);
- /**
- * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect
- * output signal on the TE signal line.
- * @dsi: DSI peripheral device
- * @mode: the Tearing Effect Output Line mode
- *
- * Return: 0 on success or a negative error code on failure
- */
- int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
- enum mipi_dsi_dcs_tear_mode mode)
- {
- u8 value = mode;
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value,
- sizeof(value));
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on);
- /**
- * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image
- * data used by the interface
- * @dsi: DSI peripheral device
- * @format: pixel format
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format)
- {
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format,
- sizeof(format));
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format);
- /**
- * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for
- * the Tearing Effect output signal of the display module
- * @dsi: DSI peripheral device
- * @scanline: scanline to use as trigger
- *
- * Return: 0 on success or a negative error code on failure
- */
- int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline)
- {
- u8 payload[3] = { MIPI_DCS_SET_TEAR_SCANLINE, scanline >> 8,
- scanline & 0xff };
- ssize_t err;
- err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline);
- /**
- * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the
- * display
- * @dsi: DSI peripheral device
- * @brightness: brightness value
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
- u16 brightness)
- {
- u8 payload[2] = { brightness & 0xff, brightness >> 8 };
- ssize_t err;
- err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
- payload, sizeof(payload));
- if (err < 0)
- return err;
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness);
- /**
- * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value
- * of the display
- * @dsi: DSI peripheral device
- * @brightness: brightness value
- *
- * Return: 0 on success or a negative error code on failure.
- */
- int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
- u16 *brightness)
- {
- ssize_t err;
- err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
- brightness, sizeof(*brightness));
- if (err <= 0) {
- if (err == 0)
- err = -ENODATA;
- return err;
- }
- return 0;
- }
- EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness);
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