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drm/atomic-helper: Re-order bridge chain pre-enable and post-disable

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Move the bridge pre_enable call before crtc enable, and the bridge
post_disable call after the crtc disable.

The sequence of enable after this patch will look like:

	bridge[n]_pre_enable
	...
	bridge[1]_pre_enable

	crtc_enable
	encoder_enable

	bridge[1]_enable
	...
	bridge[n]_enable

And, the disable sequence for the display pipeline will look like:

	bridge[n]_disable
	...
	bridge[1]_disable

	encoder_disable
	crtc_disable

	bridge[1]_post_disable
	...
	bridge[n]_post_disable

The definition of bridge pre_enable hook says that,
"The display pipe (i.e. clocks and timing signals) feeding this bridge
will not yet be running when this callback is called".

Since CRTC is also a source feeding the bridge, it should not be enabled
before the bridges in the pipeline are pre_enabled. Fix that by
re-ordering the sequence of bridge pre_enable and bridge post_disable.

While at it, update the drm bridge API documentation as well.

Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Signed-off-by: Aradhya Bhatia <aradhya.bhatia@linux.dev>
Tested-by: Devarsh Thakkar <devarsht@ti.com>
Link: https://lore.kernel.org/r/20250605171524.27222-4-aradhya.bhatia@linux.dev
Signed-off-by: Maxime Ripard <mripard@kernel.org>
This commit is contained in:
Aradhya Bhatia
2025-06-05 22:45:23 +05:30
committed by Maxime Ripard
parent d5bef6430c
commit c9b1150a68
2 changed files with 187 additions and 70 deletions
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8
drivers/gpu/drm/drm_atomic_helper.c
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@@ -1336,9 +1336,9 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *state)
{
encoder_bridge_disable(dev, state);
encoder_bridge_post_disable(dev, state);
crtc_disable(dev, state);
encoder_bridge_post_disable(dev, state);
}
/**
@@ -1674,10 +1674,10 @@ encoder_bridge_enable(struct drm_device *dev, struct drm_atomic_state *state)
void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
struct drm_atomic_state *state)
{
crtc_enable(dev, state);
encoder_bridge_pre_enable(dev, state);
crtc_enable(dev, state);
encoder_bridge_enable(dev, state);
drm_atomic_helper_commit_writebacks(dev, state);