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drm/radeon/kms: Disable both CRTCs during mode switch

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Reconfiguring one CRTC whilst another is running can cause a hang under
some circumstances. Unfortunately we haven't pinpointed exactly what those
circumstances are, so disable all CRTCs for every mode switch.

Signed-off-by: Pierre Ossman <pierre@ossman.eu>
Acked-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Pierre Ossman 2009-11-30 21:15:44 +01:00 committed by Dave Airlie
parent 32f48ffea9
commit ec51efa9b2
1 changed files with 19 additions and 2 deletions
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21
drivers/gpu/drm/radeon/radeon_legacy_crtc.c
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@ -1047,12 +1047,29 @@ static int radeon_crtc_mode_set(struct drm_crtc *crtc,
static void radeon_crtc_prepare(struct drm_crtc *crtc)
{
radeon_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
struct drm_device *dev = crtc->dev;
struct drm_crtc *crtci;
/*
* The hardware wedges sometimes if you reconfigure one CRTC
* whilst another is running (see fdo bug #24611).
*/
list_for_each_entry(crtci, &dev->mode_config.crtc_list, head)
radeon_crtc_dpms(crtci, DRM_MODE_DPMS_OFF);
}
static void radeon_crtc_commit(struct drm_crtc *crtc)
{
radeon_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
struct drm_device *dev = crtc->dev;
struct drm_crtc *crtci;
/*
* Reenable the CRTCs that should be running.
*/
list_for_each_entry(crtci, &dev->mode_config.crtc_list, head) {
if (crtci->enabled)
radeon_crtc_dpms(crtci, DRM_MODE_DPMS_ON);
}
}
static const struct drm_crtc_helper_funcs legacy_helper_funcs = {