Am 06.04.25 um 15:16 schrieb Aradhya Bhatia:
> 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.
>
> Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> 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>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
> drivers/gpu/drm/drm_atomic_helper.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 86824f769623..db5aae15e75d 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -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);
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)