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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-05-11 21:45:21 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-05-11 21:45:21 +0400 |
| commit | 254c44ea822066e24ab5efbdff1e43b8fe45ae76 (patch) | |
| tree | 547f6fd4ce1bd6dba6a5cc5184df28501d550795 /drivers/gpu/drm/i915/intel_dp.c | |
| parent | 7b76415375ba91f5a06f8d5179278c03d6151d16 (diff) | |
| parent | 6ac77e469e991e9dd91b28e503fa24b5609eedba (diff) | |
| download | linux-254c44ea822066e24ab5efbdff1e43b8fe45ae76.tar.xz | |
Merge branch 'gic-fasteoi' of git://linux-arm.org/linux-2.6-wd into devel-stable
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index cb8578b7e443..a4d80314e7f8 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1470,7 +1470,8 @@ intel_dp_link_down(struct intel_dp *intel_dp) if (!HAS_PCH_CPT(dev) && I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) { - struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp->base.base.crtc); + struct drm_crtc *crtc = intel_dp->base.base.crtc; + /* Hardware workaround: leaving our transcoder select * set to transcoder B while it's off will prevent the * corresponding HDMI output on transcoder A. @@ -1485,7 +1486,19 @@ intel_dp_link_down(struct intel_dp *intel_dp) /* Changes to enable or select take place the vblank * after being written. */ - intel_wait_for_vblank(dev, intel_crtc->pipe); + if (crtc == NULL) { + /* We can arrive here never having been attached + * to a CRTC, for instance, due to inheriting + * random state from the BIOS. + * + * If the pipe is not running, play safe and + * wait for the clocks to stabilise before + * continuing. + */ + POSTING_READ(intel_dp->output_reg); + msleep(50); + } else + intel_wait_for_vblank(dev, to_intel_crtc(crtc)->pipe); } I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN); |