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drm/i915/tv: Sleep before checking for state changes.

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We need to wait for the PLLs to settle prior to detecting the state
changes. The BIOS writers guide suggests waiting for the next vblank.

Reported-by: Carlos R. Mafra <crmafra2@gmail.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2010-09-22 19:10:09 +01:00
parent 20f0cd55f6
commit 29e1316ab1
1 changed files with 5 additions and 2 deletions
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drivers/gpu/drm/i915/intel_tv.c
+5 -2
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@@ -1271,8 +1271,12 @@ intel_tv_detect_type (struct intel_tv *intel_tv)
I915_WRITE(TV_DAC, tv_dac);
POSTING_READ(TV_DAC);
intel_wait_for_vblank(intel_tv->base.base.dev,
to_intel_crtc(intel_tv->base.base.crtc)->pipe);
type = -1;
if (wait_for((tv_dac = I915_READ(TV_DAC)) & TVDAC_STATE_CHG, 20) == 0) {
DRM_DEBUG_KMS("TV detected: %x, %x\n", tv_ctl, tv_dac);
/*
* A B C
* 0 1 1 Composite
@@ -1289,8 +1293,7 @@ intel_tv_detect_type (struct intel_tv *intel_tv)
DRM_DEBUG_KMS("Detected Component TV connection\n");
type = DRM_MODE_CONNECTOR_Component;
} else {
DRM_DEBUG_KMS("Unrecognised TV connection: %x\n",
tv_dac);
DRM_DEBUG_KMS("Unrecognised TV connection\n");
}
}