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drm/mediatek: Fix mtk_atomic_complete for runtime_pm

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To properly implement atomic w/ runtime pm, we move
drm_atomic_helper_commit_modeset_enables() above
drm_atomic_helper_commit_planes() to ensure CRTCs are enabled before
modifying plane registers, and set active_only to true to filter out
plane update notifications when the CRTC is disabled.

According to the document from linux kernel:
Set the active_only parameters to true in order not to receive plane
update notifications related to a disabled CRTC. This avoids the need
to manually ignore plane updates in driver code when the driver and/or
hardware can't or just don't need to deal with updates on disabled
CRTCs, for example when supporting runtime PM.

Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1470279597-60453-8-git-send-email-bibby.hsieh@mediatek.com
This commit is contained in:
Bibby Hsieh 2016-08-04 10:59:57 +08:00 committed by Sean Paul
parent 9c350d834f
commit ac08500c1b
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/mediatek/mtk_drm_drv.c
View file

@ -61,10 +61,25 @@ static void mtk_atomic_complete(struct mtk_drm_private *private,
mtk_atomic_wait_for_fences(state);
/*
* Mediatek drm supports runtime PM, so plane registers cannot be
* written when their crtc is disabled.
*
* The comment for drm_atomic_helper_commit states:
* For drivers supporting runtime PM the recommended sequence is
*
* drm_atomic_helper_commit_modeset_disables(dev, state);
* drm_atomic_helper_commit_modeset_enables(dev, state);
* drm_atomic_helper_commit_planes(dev, state, true);
*
* See the kerneldoc entries for these three functions for more details.
*/
drm_atomic_helper_commit_modeset_disables(drm, state);
drm_atomic_helper_commit_planes(drm, state, false);
drm_atomic_helper_commit_modeset_enables(drm, state);
drm_atomic_helper_commit_planes(drm, state, true);
drm_atomic_helper_wait_for_vblanks(drm, state);
drm_atomic_helper_cleanup_planes(drm, state);
drm_atomic_state_free(state);
}