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| author | Brian Masney <masneyb@onstation.org> | 2019-05-31 05:46:15 -0400 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2019-08-01 10:21:23 -0400 |
| commit | 2bab52af6fe68c43b327a57e5ce5fc10eefdfadf (patch) | |
| tree | b2b050dc192c480ee4c0a749dfe48cfa26cc8e11 /drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | |
| parent | 3de433c5b38af49a5fc7602721e2ab5d39f1e69c (diff) | |
| download | linux-stable-2bab52af6fe68c43b327a57e5ce5fc10eefdfadf.tar.gz linux-stable-2bab52af6fe68c43b327a57e5ce5fc10eefdfadf.tar.bz2 linux-stable-2bab52af6fe68c43b327a57e5ce5fc10eefdfadf.zip | |
drm/msm: add support for per-CRTC max_vblank_count on mdp5
The mdp5 drm/kms driver currently does not work on command-mode DSI
panels due to 'vblank wait timed out' errors. This causes a latency
of seconds, or tens of seconds in some cases, before content is shown
on the panel. This hardware does not have the something that we can use
as a frame counter available when running in command mode, so we need to
fall back to using timestamps by setting the max_vblank_count to zero.
This can be done on a per-CRTC basis, so the convert mdp5 to use
drm_crtc_set_max_vblank_count().
This change was tested on a LG Nexus 5 (hammerhead) phone.
Suggested-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190531094619.31704-3-masneyb@onstation.org
Diffstat (limited to 'drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c')
| -rw-r--r-- | drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c index 4a60f5fca6b0..fec6ef1ae3b9 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c @@ -740,7 +740,7 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev) dev->driver->get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos; dev->driver->get_scanout_position = mdp5_get_scanoutpos; dev->driver->get_vblank_counter = mdp5_get_vblank_counter; - dev->max_vblank_count = 0xffffffff; + dev->max_vblank_count = 0; /* max_vblank_count is set on each CRTC */ dev->vblank_disable_immediate = true; return kms; |