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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 NXP.
*/
#include <drm/drm_atomic_helper.h>
#include <drm/drm_vblank.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include "dcss-dev.h"
#include "dcss-kms.h"
static int dcss_enable_vblank(struct drm_crtc *crtc)
{
struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
base);
struct dcss_dev *dcss = crtc->dev->dev_private;
dcss_dtg_vblank_irq_enable(dcss->dtg, true);
dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);
enable_irq(dcss_crtc->irq);
return 0;
}
static void dcss_disable_vblank(struct drm_crtc *crtc)
{
struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
base);
struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
disable_irq_nosync(dcss_crtc->irq);
dcss_dtg_vblank_irq_enable(dcss->dtg, false);
if (dcss_crtc->disable_ctxld_kick_irq)
dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, false);
}
static const struct drm_crtc_funcs dcss_crtc_funcs = {
.set_config = drm_atomic_helper_set_config,
.destroy = drm_crtc_cleanup,
.page_flip = drm_atomic_helper_page_flip,
.reset = drm_atomic_helper_crtc_reset,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
.enable_vblank = dcss_enable_vblank,
.disable_vblank = dcss_disable_vblank,
};
static void dcss_crtc_atomic_begin(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
drm_crtc_vblank_on(crtc);
}
static void dcss_crtc_atomic_flush(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
base);
struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
spin_lock_irq(&crtc->dev->event_lock);
if (crtc->state->event) {
WARN_ON(drm_crtc_vblank_get(crtc));
drm_crtc_arm_vblank_event(crtc, crtc->state->event);
crtc->state->event = NULL;
}
spin_unlock_irq(&crtc->dev->event_lock);
if (dcss_dtg_is_enabled(dcss->dtg))
dcss_ctxld_enable(dcss->ctxld);
}
static void dcss_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
base);
struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
struct drm_display_mode *mode = &crtc->state->adjusted_mode;
struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
struct videomode vm;
drm_display_mode_to_videomode(mode, &vm);
pm_runtime_get_sync(dcss->dev);
vm.pixelclock = mode->crtc_clock * 1000;
dcss_ss_subsam_set(dcss->ss);
dcss_dtg_css_set(dcss->dtg);
if (!drm_mode_equal(mode, old_mode) || !old_crtc_state->active) {
dcss_dtg_sync_set(dcss->dtg, &vm);
dcss_ss_sync_set(dcss->ss, &vm,
mode->flags & DRM_MODE_FLAG_PHSYNC,
mode->flags & DRM_MODE_FLAG_PVSYNC);
}
dcss_enable_dtg_and_ss(dcss);
dcss_ctxld_enable(dcss->ctxld);
/* Allow CTXLD kick interrupt to be disabled when VBLANK is disabled. */
dcss_crtc->disable_ctxld_kick_irq = true;
}
static void dcss_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
base);
struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
struct drm_display_mode *mode = &crtc->state->adjusted_mode;
struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, false);
spin_lock_irq(&crtc->dev->event_lock);
if (crtc->state->event) {
drm_crtc_send_vblank_event(crtc, crtc->state->event);
crtc->state->event = NULL;
}
spin_unlock_irq(&crtc->dev->event_lock);
dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);
reinit_completion(&dcss->disable_completion);
dcss_disable_dtg_and_ss(dcss);
dcss_ctxld_enable(dcss->ctxld);
if (!drm_mode_equal(mode, old_mode) || !crtc->state->active)
if (!wait_for_completion_timeout(&dcss->disable_completion,
msecs_to_jiffies(100)))
dev_err(dcss->dev, "Shutting off DTG timed out.\n");
/*
* Do not shut off CTXLD kick interrupt when shutting VBLANK off. It
* will be needed to commit the last changes, before going to suspend.
*/
dcss_crtc->disable_ctxld_kick_irq = false;
drm_crtc_vblank_off(crtc);
pm_runtime_mark_last_busy(dcss->dev);
pm_runtime_put_autosuspend(dcss->dev);
}
static const struct drm_crtc_helper_funcs dcss_helper_funcs = {
.atomic_begin = dcss_crtc_atomic_begin,
.atomic_flush = dcss_crtc_atomic_flush,
.atomic_enable = dcss_crtc_atomic_enable,
.atomic_disable = dcss_crtc_atomic_disable,
};
static irqreturn_t dcss_crtc_irq_handler(int irq, void *dev_id)
{
struct dcss_crtc *dcss_crtc = dev_id;
struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
if (!dcss_dtg_vblank_irq_valid(dcss->dtg))
return IRQ_NONE;
if (dcss_ctxld_is_flushed(dcss->ctxld))
drm_crtc_handle_vblank(&dcss_crtc->base);
dcss_dtg_vblank_irq_clear(dcss->dtg);
return IRQ_HANDLED;
}
int dcss_crtc_init(struct dcss_crtc *crtc, struct drm_device *drm)
{
struct dcss_dev *dcss = drm->dev_private;
struct platform_device *pdev = to_platform_device(dcss->dev);
int ret;
crtc->plane[0] = dcss_plane_init(drm, drm_crtc_mask(&crtc->base),
DRM_PLANE_TYPE_PRIMARY, 0);
if (IS_ERR(crtc->plane[0]))
return PTR_ERR(crtc->plane[0]);
crtc->base.port = dcss->of_port;
drm_crtc_helper_add(&crtc->base, &dcss_helper_funcs);
ret = drm_crtc_init_with_planes(drm, &crtc->base, &crtc->plane[0]->base,
NULL, &dcss_crtc_funcs, NULL);
if (ret) {
dev_err(dcss->dev, "failed to init crtc\n");
return ret;
}
crtc->irq = platform_get_irq_byname(pdev, "vblank");
if (crtc->irq < 0)
return crtc->irq;
ret = request_irq(crtc->irq, dcss_crtc_irq_handler,
0, "dcss_drm", crtc);
if (ret) {
dev_err(dcss->dev, "irq request failed with %d.\n", ret);
return ret;
}
disable_irq(crtc->irq);
return 0;
}
void dcss_crtc_deinit(struct dcss_crtc *crtc, struct drm_device *drm)
{
free_irq(crtc->irq, crtc);
}
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