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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (C) 2014 Traphandler
- * Copyright (C) 2014 Free Electrons
- *
- * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
- * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
- */
- #include <linux/clk.h>
- #include <linux/mfd/atmel-hlcdc.h>
- #include <linux/pinctrl/consumer.h>
- #include <linux/pm.h>
- #include <linux/pm_runtime.h>
- #include <video/videomode.h>
- #include <drm/drm_atomic.h>
- #include <drm/drm_atomic_helper.h>
- #include <drm/drm_crtc.h>
- #include <drm/drm_modeset_helper_vtables.h>
- #include <drm/drm_probe_helper.h>
- #include <drm/drm_vblank.h>
- #include "atmel_hlcdc_dc.h"
- /**
- * Atmel HLCDC CRTC state structure
- *
- * @base: base CRTC state
- * @output_mode: RGBXXX output mode
- */
- struct atmel_hlcdc_crtc_state {
- struct drm_crtc_state base;
- unsigned int output_mode;
- };
- static inline struct atmel_hlcdc_crtc_state *
- drm_crtc_state_to_atmel_hlcdc_crtc_state(struct drm_crtc_state *state)
- {
- return container_of(state, struct atmel_hlcdc_crtc_state, base);
- }
- /**
- * Atmel HLCDC CRTC structure
- *
- * @base: base DRM CRTC structure
- * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
- * @event: pointer to the current page flip event
- * @id: CRTC id (returned by drm_crtc_index)
- */
- struct atmel_hlcdc_crtc {
- struct drm_crtc base;
- struct atmel_hlcdc_dc *dc;
- struct drm_pending_vblank_event *event;
- int id;
- };
- static inline struct atmel_hlcdc_crtc *
- drm_crtc_to_atmel_hlcdc_crtc(struct drm_crtc *crtc)
- {
- return container_of(crtc, struct atmel_hlcdc_crtc, base);
- }
- static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
- {
- struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
- struct regmap *regmap = crtc->dc->hlcdc->regmap;
- struct drm_display_mode *adj = &c->state->adjusted_mode;
- struct atmel_hlcdc_crtc_state *state;
- unsigned long mode_rate;
- struct videomode vm;
- unsigned long prate;
- unsigned int mask = ATMEL_HLCDC_CLKDIV_MASK | ATMEL_HLCDC_CLKPOL;
- unsigned int cfg = 0;
- int div, ret;
- ret = clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
- if (ret)
- return;
- vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
- vm.vback_porch = adj->crtc_vtotal - adj->crtc_vsync_end;
- vm.vsync_len = adj->crtc_vsync_end - adj->crtc_vsync_start;
- vm.hfront_porch = adj->crtc_hsync_start - adj->crtc_hdisplay;
- vm.hback_porch = adj->crtc_htotal - adj->crtc_hsync_end;
- vm.hsync_len = adj->crtc_hsync_end - adj->crtc_hsync_start;
- regmap_write(regmap, ATMEL_HLCDC_CFG(1),
- (vm.hsync_len - 1) | ((vm.vsync_len - 1) << 16));
- regmap_write(regmap, ATMEL_HLCDC_CFG(2),
- (vm.vfront_porch - 1) | (vm.vback_porch << 16));
- regmap_write(regmap, ATMEL_HLCDC_CFG(3),
- (vm.hfront_porch - 1) | ((vm.hback_porch - 1) << 16));
- regmap_write(regmap, ATMEL_HLCDC_CFG(4),
- (adj->crtc_hdisplay - 1) |
- ((adj->crtc_vdisplay - 1) << 16));
- prate = clk_get_rate(crtc->dc->hlcdc->sys_clk);
- mode_rate = adj->crtc_clock * 1000;
- if (!crtc->dc->desc->fixed_clksrc) {
- prate *= 2;
- cfg |= ATMEL_HLCDC_CLKSEL;
- mask |= ATMEL_HLCDC_CLKSEL;
- }
- div = DIV_ROUND_UP(prate, mode_rate);
- if (div < 2) {
- div = 2;
- } else if (ATMEL_HLCDC_CLKDIV(div) & ~ATMEL_HLCDC_CLKDIV_MASK) {
- /* The divider ended up too big, try a lower base rate. */
- cfg &= ~ATMEL_HLCDC_CLKSEL;
- prate /= 2;
- div = DIV_ROUND_UP(prate, mode_rate);
- if (ATMEL_HLCDC_CLKDIV(div) & ~ATMEL_HLCDC_CLKDIV_MASK)
- div = ATMEL_HLCDC_CLKDIV_MASK;
- } else {
- int div_low = prate / mode_rate;
- if (div_low >= 2 &&
- (10 * (prate / div_low - mode_rate) <
- (mode_rate - prate / div)))
- /*
- * At least 10 times better when using a higher
- * frequency than requested, instead of a lower.
- * So, go with that.
- */
- div = div_low;
- }
- cfg |= ATMEL_HLCDC_CLKDIV(div);
- regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0), mask, cfg);
- state = drm_crtc_state_to_atmel_hlcdc_crtc_state(c->state);
- cfg = state->output_mode << 8;
- if (adj->flags & DRM_MODE_FLAG_NVSYNC)
- cfg |= ATMEL_HLCDC_VSPOL;
- if (adj->flags & DRM_MODE_FLAG_NHSYNC)
- cfg |= ATMEL_HLCDC_HSPOL;
- regmap_update_bits(regmap, ATMEL_HLCDC_CFG(5),
- ATMEL_HLCDC_HSPOL | ATMEL_HLCDC_VSPOL |
- ATMEL_HLCDC_VSPDLYS | ATMEL_HLCDC_VSPDLYE |
- ATMEL_HLCDC_DISPPOL | ATMEL_HLCDC_DISPDLY |
- ATMEL_HLCDC_VSPSU | ATMEL_HLCDC_VSPHO |
- ATMEL_HLCDC_GUARDTIME_MASK | ATMEL_HLCDC_MODE_MASK,
- cfg);
- clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
- }
- static enum drm_mode_status
- atmel_hlcdc_crtc_mode_valid(struct drm_crtc *c,
- const struct drm_display_mode *mode)
- {
- struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
- return atmel_hlcdc_dc_mode_valid(crtc->dc, mode);
- }
- static void atmel_hlcdc_crtc_atomic_disable(struct drm_crtc *c,
- struct drm_crtc_state *old_state)
- {
- struct drm_device *dev = c->dev;
- struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
- struct regmap *regmap = crtc->dc->hlcdc->regmap;
- unsigned int status;
- drm_crtc_vblank_off(c);
- pm_runtime_get_sync(dev->dev);
- regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
- while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
- (status & ATMEL_HLCDC_DISP))
- cpu_relax();
- regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
- while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
- (status & ATMEL_HLCDC_SYNC))
- cpu_relax();
- regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
- while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
- (status & ATMEL_HLCDC_PIXEL_CLK))
- cpu_relax();
- clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
- pinctrl_pm_select_sleep_state(dev->dev);
- pm_runtime_allow(dev->dev);
- pm_runtime_put_sync(dev->dev);
- }
- static void atmel_hlcdc_crtc_atomic_enable(struct drm_crtc *c,
- struct drm_crtc_state *old_state)
- {
- struct drm_device *dev = c->dev;
- struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
- struct regmap *regmap = crtc->dc->hlcdc->regmap;
- unsigned int status;
- pm_runtime_get_sync(dev->dev);
- pm_runtime_forbid(dev->dev);
- pinctrl_pm_select_default_state(dev->dev);
- clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
- regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
- while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
- !(status & ATMEL_HLCDC_PIXEL_CLK))
- cpu_relax();
- regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
- while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
- !(status & ATMEL_HLCDC_SYNC))
- cpu_relax();
- regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
- while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
- !(status & ATMEL_HLCDC_DISP))
- cpu_relax();
- pm_runtime_put_sync(dev->dev);
- drm_crtc_vblank_on(c);
- }
- #define ATMEL_HLCDC_RGB444_OUTPUT BIT(0)
- #define ATMEL_HLCDC_RGB565_OUTPUT BIT(1)
- #define ATMEL_HLCDC_RGB666_OUTPUT BIT(2)
- #define ATMEL_HLCDC_RGB888_OUTPUT BIT(3)
- #define ATMEL_HLCDC_OUTPUT_MODE_MASK GENMASK(3, 0)
- static int atmel_hlcdc_connector_output_mode(struct drm_connector_state *state)
- {
- struct drm_connector *connector = state->connector;
- struct drm_display_info *info = &connector->display_info;
- struct drm_encoder *encoder;
- unsigned int supported_fmts = 0;
- int j;
- encoder = state->best_encoder;
- if (!encoder)
- encoder = connector->encoder;
- switch (atmel_hlcdc_encoder_get_bus_fmt(encoder)) {
- case 0:
- break;
- case MEDIA_BUS_FMT_RGB444_1X12:
- return ATMEL_HLCDC_RGB444_OUTPUT;
- case MEDIA_BUS_FMT_RGB565_1X16:
- return ATMEL_HLCDC_RGB565_OUTPUT;
- case MEDIA_BUS_FMT_RGB666_1X18:
- return ATMEL_HLCDC_RGB666_OUTPUT;
- case MEDIA_BUS_FMT_RGB888_1X24:
- return ATMEL_HLCDC_RGB888_OUTPUT;
- default:
- return -EINVAL;
- }
- for (j = 0; j < info->num_bus_formats; j++) {
- switch (info->bus_formats[j]) {
- case MEDIA_BUS_FMT_RGB444_1X12:
- supported_fmts |= ATMEL_HLCDC_RGB444_OUTPUT;
- break;
- case MEDIA_BUS_FMT_RGB565_1X16:
- supported_fmts |= ATMEL_HLCDC_RGB565_OUTPUT;
- break;
- case MEDIA_BUS_FMT_RGB666_1X18:
- supported_fmts |= ATMEL_HLCDC_RGB666_OUTPUT;
- break;
- case MEDIA_BUS_FMT_RGB888_1X24:
- supported_fmts |= ATMEL_HLCDC_RGB888_OUTPUT;
- break;
- default:
- break;
- }
- }
- return supported_fmts;
- }
- static int atmel_hlcdc_crtc_select_output_mode(struct drm_crtc_state *state)
- {
- unsigned int output_fmts = ATMEL_HLCDC_OUTPUT_MODE_MASK;
- struct atmel_hlcdc_crtc_state *hstate;
- struct drm_connector_state *cstate;
- struct drm_connector *connector;
- struct atmel_hlcdc_crtc *crtc;
- int i;
- crtc = drm_crtc_to_atmel_hlcdc_crtc(state->crtc);
- for_each_new_connector_in_state(state->state, connector, cstate, i) {
- unsigned int supported_fmts = 0;
- if (!cstate->crtc)
- continue;
- supported_fmts = atmel_hlcdc_connector_output_mode(cstate);
- if (crtc->dc->desc->conflicting_output_formats)
- output_fmts &= supported_fmts;
- else
- output_fmts |= supported_fmts;
- }
- if (!output_fmts)
- return -EINVAL;
- hstate = drm_crtc_state_to_atmel_hlcdc_crtc_state(state);
- hstate->output_mode = fls(output_fmts) - 1;
- return 0;
- }
- static int atmel_hlcdc_crtc_atomic_check(struct drm_crtc *c,
- struct drm_crtc_state *s)
- {
- int ret;
- ret = atmel_hlcdc_crtc_select_output_mode(s);
- if (ret)
- return ret;
- ret = atmel_hlcdc_plane_prepare_disc_area(s);
- if (ret)
- return ret;
- return atmel_hlcdc_plane_prepare_ahb_routing(s);
- }
- static void atmel_hlcdc_crtc_atomic_begin(struct drm_crtc *c,
- struct drm_crtc_state *old_s)
- {
- struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
- if (c->state->event) {
- c->state->event->pipe = drm_crtc_index(c);
- WARN_ON(drm_crtc_vblank_get(c) != 0);
- crtc->event = c->state->event;
- c->state->event = NULL;
- }
- }
- static void atmel_hlcdc_crtc_atomic_flush(struct drm_crtc *crtc,
- struct drm_crtc_state *old_s)
- {
- /* TODO: write common plane control register if available */
- }
- static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = {
- .mode_valid = atmel_hlcdc_crtc_mode_valid,
- .mode_set_nofb = atmel_hlcdc_crtc_mode_set_nofb,
- .atomic_check = atmel_hlcdc_crtc_atomic_check,
- .atomic_begin = atmel_hlcdc_crtc_atomic_begin,
- .atomic_flush = atmel_hlcdc_crtc_atomic_flush,
- .atomic_enable = atmel_hlcdc_crtc_atomic_enable,
- .atomic_disable = atmel_hlcdc_crtc_atomic_disable,
- };
- static void atmel_hlcdc_crtc_destroy(struct drm_crtc *c)
- {
- struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
- drm_crtc_cleanup(c);
- kfree(crtc);
- }
- static void atmel_hlcdc_crtc_finish_page_flip(struct atmel_hlcdc_crtc *crtc)
- {
- struct drm_device *dev = crtc->base.dev;
- unsigned long flags;
- spin_lock_irqsave(&dev->event_lock, flags);
- if (crtc->event) {
- drm_crtc_send_vblank_event(&crtc->base, crtc->event);
- drm_crtc_vblank_put(&crtc->base);
- crtc->event = NULL;
- }
- spin_unlock_irqrestore(&dev->event_lock, flags);
- }
- void atmel_hlcdc_crtc_irq(struct drm_crtc *c)
- {
- drm_crtc_handle_vblank(c);
- atmel_hlcdc_crtc_finish_page_flip(drm_crtc_to_atmel_hlcdc_crtc(c));
- }
- static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc)
- {
- struct atmel_hlcdc_crtc_state *state;
- if (crtc->state) {
- __drm_atomic_helper_crtc_destroy_state(crtc->state);
- state = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
- kfree(state);
- crtc->state = NULL;
- }
- state = kzalloc(sizeof(*state), GFP_KERNEL);
- if (state)
- __drm_atomic_helper_crtc_reset(crtc, &state->base);
- }
- static struct drm_crtc_state *
- atmel_hlcdc_crtc_duplicate_state(struct drm_crtc *crtc)
- {
- struct atmel_hlcdc_crtc_state *state, *cur;
- if (WARN_ON(!crtc->state))
- return NULL;
- state = kmalloc(sizeof(*state), GFP_KERNEL);
- if (!state)
- return NULL;
- __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
- cur = drm_crtc_state_to_atmel_hlcdc_crtc_state(crtc->state);
- state->output_mode = cur->output_mode;
- return &state->base;
- }
- static void atmel_hlcdc_crtc_destroy_state(struct drm_crtc *crtc,
- struct drm_crtc_state *s)
- {
- struct atmel_hlcdc_crtc_state *state;
- state = drm_crtc_state_to_atmel_hlcdc_crtc_state(s);
- __drm_atomic_helper_crtc_destroy_state(s);
- kfree(state);
- }
- static int atmel_hlcdc_crtc_enable_vblank(struct drm_crtc *c)
- {
- struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
- struct regmap *regmap = crtc->dc->hlcdc->regmap;
- /* Enable SOF (Start Of Frame) interrupt for vblank counting */
- regmap_write(regmap, ATMEL_HLCDC_IER, ATMEL_HLCDC_SOF);
- return 0;
- }
- static void atmel_hlcdc_crtc_disable_vblank(struct drm_crtc *c)
- {
- struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
- struct regmap *regmap = crtc->dc->hlcdc->regmap;
- regmap_write(regmap, ATMEL_HLCDC_IDR, ATMEL_HLCDC_SOF);
- }
- static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = {
- .page_flip = drm_atomic_helper_page_flip,
- .set_config = drm_atomic_helper_set_config,
- .destroy = atmel_hlcdc_crtc_destroy,
- .reset = atmel_hlcdc_crtc_reset,
- .atomic_duplicate_state = atmel_hlcdc_crtc_duplicate_state,
- .atomic_destroy_state = atmel_hlcdc_crtc_destroy_state,
- .enable_vblank = atmel_hlcdc_crtc_enable_vblank,
- .disable_vblank = atmel_hlcdc_crtc_disable_vblank,
- .gamma_set = drm_atomic_helper_legacy_gamma_set,
- };
- int atmel_hlcdc_crtc_create(struct drm_device *dev)
- {
- struct atmel_hlcdc_plane *primary = NULL, *cursor = NULL;
- struct atmel_hlcdc_dc *dc = dev->dev_private;
- struct atmel_hlcdc_crtc *crtc;
- int ret;
- int i;
- crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
- if (!crtc)
- return -ENOMEM;
- crtc->dc = dc;
- for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
- if (!dc->layers[i])
- continue;
- switch (dc->layers[i]->desc->type) {
- case ATMEL_HLCDC_BASE_LAYER:
- primary = atmel_hlcdc_layer_to_plane(dc->layers[i]);
- break;
- case ATMEL_HLCDC_CURSOR_LAYER:
- cursor = atmel_hlcdc_layer_to_plane(dc->layers[i]);
- break;
- default:
- break;
- }
- }
- ret = drm_crtc_init_with_planes(dev, &crtc->base, &primary->base,
- &cursor->base, &atmel_hlcdc_crtc_funcs,
- NULL);
- if (ret < 0)
- goto fail;
- crtc->id = drm_crtc_index(&crtc->base);
- for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
- struct atmel_hlcdc_plane *overlay;
- if (dc->layers[i] &&
- dc->layers[i]->desc->type == ATMEL_HLCDC_OVERLAY_LAYER) {
- overlay = atmel_hlcdc_layer_to_plane(dc->layers[i]);
- overlay->base.possible_crtcs = 1 << crtc->id;
- }
- }
- drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
- drm_mode_crtc_set_gamma_size(&crtc->base, ATMEL_HLCDC_CLUT_SIZE);
- drm_crtc_enable_color_mgmt(&crtc->base, 0, false,
- ATMEL_HLCDC_CLUT_SIZE);
- dc->crtc = &crtc->base;
- return 0;
- fail:
- atmel_hlcdc_crtc_destroy(&crtc->base);
- return ret;
- }
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