From: Zhao Yakui Date: Wed, 7 Apr 2010 09:11:19 +0000 (+0800) Subject: drm/i915: Configure the TV sense state correctly on GM45 to make TV detection reliable X-Git-Tag: firefly_0821_release~9833^2~1599^2~116^2~47 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fb8b5a39b6310379d7b54c0c7113703a8eaf4a57;p=firefly-linux-kernel-4.4.55.git drm/i915: Configure the TV sense state correctly on GM45 to make TV detection reliable The TV detection logic is not reliable on the Cantiga platform. Sometimes the TV will be misdetected as the following two cases: - TV is misdetected on some laptops. e.g. There is no TV connector port or no TV is attached. But the TV is shown as connected. - TV connector type is misdetected. e.g. the component TV is attached, but the TV is shown as S-video type. According to the hardware requirement, the TV sense state bits of TV DAC register should be cleared to zero on Cantiga platfrom. https://bugzilla.kernel.org/show_bug.cgi?id=14792 Cc: Stable Team Signed-off-by: Zhao Yakui Tested-by: Santi Signed-off-by: Zhenyu Wang Signed-off-by: Eric Anholt --- diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c index d7d39b2327df..eea593071e49 100644 --- a/drivers/gpu/drm/i915/intel_tv.c +++ b/drivers/gpu/drm/i915/intel_tv.c @@ -1399,6 +1399,15 @@ intel_tv_detect_type (struct drm_crtc *crtc, struct intel_encoder *intel_encoder DAC_A_0_7_V | DAC_B_0_7_V | DAC_C_0_7_V); + + /* + * The TV sense state should be cleared to zero on cantiga platform. Otherwise + * the TV is misdetected. This is hardware requirement. + */ + if (IS_GM45(dev)) + tv_dac &= ~(TVDAC_STATE_CHG_EN | TVDAC_A_SENSE_CTL | + TVDAC_B_SENSE_CTL | TVDAC_C_SENSE_CTL); + I915_WRITE(TV_CTL, tv_ctl); I915_WRITE(TV_DAC, tv_dac); intel_wait_for_vblank(dev);