xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm: Introduce drm_fb_helper_prepare()

Browse Source 
To implement hotplug detection in a race-free manner, drivers must call
drm_kms_helper_poll_init() before hotplug events can be triggered. Such
events can be triggered right after any of the encoders or connectors
are initialized. At the same time, if the drm_fb_helper_hotplug_event()
helper is used by a driver, then the poll helper requires some parts of
the FB helper to be initialized to prevent a crash.

At the same time, drm_fb_helper_init() requires information that is not
necessarily available at such an early stage (number of CRTCs and
connectors), so it cannot be used yet.

Add a new helper, drm_fb_helper_prepare(), that initializes the bare
minimum needed to allow drm_kms_helper_poll_init() to execute and any
subsequent hotplug events to be processed properly.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thierry Reding
2014-06-27 17:19:24 +02:00
committed by Dave Airlie
parent 3a4938799d
commit 10a2310265
18 changed files with 72 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/radeon/radeon_fb.c
View File

@@ -353,7 +353,9 @@ int radeon_fbdev_init(struct radeon_device *rdev)
rfbdev->rdev = rdev;
rdev->mode_info.rfbdev = rfbdev;
rfbdev->helper.funcs = &radeon_fb_helper_funcs;
drm_fb_helper_prepare(rdev->ddev, &rfbdev->helper,
&radeon_fb_helper_funcs);
ret = drm_fb_helper_init(rdev->ddev, &rfbdev->helper,
rdev->num_crtc,