UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

drm/omap: work-around for omap3 display enable 

Seems that on omap3 enabling a crtc without any planes causes a sync
lost flood. This only happens on the first enable, and after that it
works. This looks like an HW issue and it's unclear why this is
happening or how to fix it.

This started happening after 897145d0c7
("drm/omapdrm: Move commit_modeset_enables() before commit_planes()")
which, as a work-around, changed omapdrm first to do the modeset enable,
and plane set only after that. This WA should be fine on all DSS
versions, but apparently OMAP3 DSS is an exception.

This patch reverts that work-around for OMAP3 DSS.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2017-08-23 12:19:02 +03:00
parent 0c43f1e025
commit fc5cc9678e
1 changed files with 28 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/gpu/drm/omapdrm/omap_drv.c
View File

@ -84,23 +84,36 @@ static void omap_atomic_commit_tail(struct drm_atomic_state *old_state)
/* Apply the atomic update. */
drm_atomic_helper_commit_modeset_disables(dev, old_state);
/* With the current dss dispc implementation we have to enable
* the new modeset before we can commit planes. The dispc ovl
* configuration relies on the video mode configuration been
* written into the HW when the ovl configuration is
* calculated.
*
* This approach is not ideal because after a mode change the
* plane update is executed only after the first vblank
* interrupt. The dispc implementation should be fixed so that
* it is able use uncommitted drm state information.
*/
drm_atomic_helper_commit_modeset_enables(dev, old_state);
omap_atomic_wait_for_completion(dev, old_state);
if (priv->omaprev != 0x3430) {
/* With the current dss dispc implementation we have to enable
* the new modeset before we can commit planes. The dispc ovl
* configuration relies on the video mode configuration been
* written into the HW when the ovl configuration is
* calculated.
*
* This approach is not ideal because after a mode change the
* plane update is executed only after the first vblank
* interrupt. The dispc implementation should be fixed so that
* it is able use uncommitted drm state information.
*/
drm_atomic_helper_commit_modeset_enables(dev, old_state);
omap_atomic_wait_for_completion(dev, old_state);
drm_atomic_helper_commit_planes(dev, old_state, 0);
drm_atomic_helper_commit_planes(dev, old_state, 0);
drm_atomic_helper_commit_hw_done(old_state);
drm_atomic_helper_commit_hw_done(old_state);
} else {
/*
* OMAP3 DSS seems to have issues with the work-around above,
* resulting in endless sync losts if a crtc is enabled without
* a plane. For now, skip the WA for OMAP3.
*/
drm_atomic_helper_commit_planes(dev, old_state, 0);
drm_atomic_helper_commit_modeset_enables(dev, old_state);
drm_atomic_helper_commit_hw_done(old_state);
}
/*
* Wait for completion of the page flips to ensure that old buffers