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drm/komeda: Fix handling of atomic commits in the atomic_commit_tail hook

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[ Upstream commit eaa225b6b52233d45457fd33730e1528c604d92d ]

Komeda driver relies on the generic DRM atomic helper functions to handle
commits. It only implements an atomic_commit_tail hook for the
mode_config_helper_funcs and even that one is pretty close to the generic
implementation with the exception of additional dma_fence signalling.

What the generic helper framework doesn't do is waiting for the actual
hardware to signal that the commit parameters have been written into the
appropriate registers. As we signal CRTC events only on the irq handlers,
we need to flush the configuration and wait for the hardware to respond.

Add the Komeda specific implementation for atomic_commit_hw_done() that
flushes and waits for flip done before calling drm_atomic_helper_commit_hw_done().

The fix was prompted by a patch from Carsten Haitzler where he was trying to
solve the same issue but in a different way that I think can lead to wrong
event signaling to userspace.

Reported-by: Carsten Haitzler <carsten.haitzler@arm.com>
Tested-by: Carsten Haitzler <carsten.haitzler@arm.com>
Reviewed-by: Carsten Haitzler <carsten.haitzler@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220722122139.288486-1-liviu.dudau@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Liviu Dudau 2022-07-08 16:39:21 +01:00 committed by Greg Kroah-Hartman
parent ca163e389f
commit 5ff7bec678
3 changed files with 24 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
View File

@ -235,7 +235,7 @@ void komeda_crtc_handle_event(struct komeda_crtc *kcrtc,
crtc->state->event = NULL;
drm_crtc_send_vblank_event(crtc, event);
} else {
DRM_WARN("CRTC[%d]: FLIP happen but no pending commit.\n",
DRM_WARN("CRTC[%d]: FLIP happened but no pending commit.\n",
drm_crtc_index(&kcrtc->base));
}
spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
@ -286,7 +286,7 @@ komeda_crtc_atomic_enable(struct drm_crtc *crtc,
komeda_crtc_do_flush(crtc, old);
}
static void
void
komeda_crtc_flush_and_wait_for_flip_done(struct komeda_crtc *kcrtc,
struct completion *input_flip_done)
{

21
drivers/gpu/drm/arm/display/komeda/komeda_kms.c
View File

@ -69,6 +69,25 @@ static const struct drm_driver komeda_kms_driver = {
.minor = 1,
};
static void komeda_kms_atomic_commit_hw_done(struct drm_atomic_state *state)
{
struct drm_device *dev = state->dev;
struct komeda_kms_dev *kms = to_kdev(dev);
int i;
for (i = 0; i < kms->n_crtcs; i++) {
struct komeda_crtc *kcrtc = &kms->crtcs[i];
if (kcrtc->base.state->active) {
struct completion *flip_done = NULL;
if (kcrtc->base.state->event)
flip_done = kcrtc->base.state->event->base.completion;
komeda_crtc_flush_and_wait_for_flip_done(kcrtc, flip_done);
}
}
drm_atomic_helper_commit_hw_done(state);
}
static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
{
struct drm_device *dev = old_state->dev;
@ -81,7 +100,7 @@ static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
drm_atomic_helper_commit_modeset_enables(dev, old_state);
drm_atomic_helper_commit_hw_done(old_state);
komeda_kms_atomic_commit_hw_done(old_state);
drm_atomic_helper_wait_for_flip_done(dev, old_state);

2
drivers/gpu/drm/arm/display/komeda/komeda_kms.h
View File

@ -182,6 +182,8 @@ void komeda_kms_cleanup_private_objs(struct komeda_kms_dev *kms);
void komeda_crtc_handle_event(struct komeda_crtc *kcrtc,
struct komeda_events *evts);
void komeda_crtc_flush_and_wait_for_flip_done(struct komeda_crtc *kcrtc,
struct completion *input_flip_done);
struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev);
void komeda_kms_detach(struct komeda_kms_dev *kms);