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| author | Bibby Hsieh <bibby.hsieh@mediatek.com> | 2016-08-04 05:59:57 +0300 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2016-08-08 21:20:02 +0300 |
| commit | ac08500c1bcb620810838c735143a00e5acf5b5f (patch) | |
| tree | fb743a1fd8e51872bbae90498a47e6a35fa2f6f4 /drivers/gpu/drm/mediatek/mtk_drm_drv.c | |
| parent | 9c350d834f08407d8470b3c09bbc34e42d261362 (diff) | |
| download | linux-ac08500c1bcb620810838c735143a00e5acf5b5f.tar.xz | |
drm/mediatek: Fix mtk_atomic_complete for runtime_pm
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
Diffstat (limited to 'drivers/gpu/drm/mediatek/mtk_drm_drv.c')
| -rw-r--r-- | drivers/gpu/drm/mediatek/mtk_drm_drv.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index eebb7d881c2b..0e769abd0c2c 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -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); } |