From: Stéphane Marchesin <marcheu@xxxxxxxxxxxx> The AVI Infoframe disappears on SNB after suspend/resume. This patch works around what seems to be a hardware issue by doing a dummy register write on DPMS calls. BUG=chrome-os-partner:16054 TEST=with the HDMI analyzer: suspend/resume parrot, verify that TEST=the AVI infoframe is still here Change-Id: I7cb880408db3cd279d09cb7a53f6787c14e03027 Reviewed-on: https://gerrit.chromium.org/gerrit/37596 Tested-by: Stéphane Marchesin <marcheu@xxxxxxxxxxxx> Reviewed-by: Stuart Abercrombie <sabercrombie@xxxxxxxxxxxx> Commit-Ready: Stéphane Marchesin <marcheu@xxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_hdmi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index 2ee9821..3085e2b 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -746,6 +746,12 @@ static void intel_disable_hdmi(struct intel_encoder *encoder) I915_WRITE(intel_hdmi->sdvox_reg, temp); POSTING_READ(intel_hdmi->sdvox_reg); } + + /* Workaround for disappearing AVI Infoframe on SNB on resume */ + if (HAS_PCH_SPLIT(dev)) { + I915_WRITE(_VIDEO_DIP_CTL_A, I915_READ(_VIDEO_DIP_CTL_A)); + I915_WRITE(_VIDEO_DIP_CTL_B, I915_READ(_VIDEO_DIP_CTL_B)); + } } static int intel_hdmi_mode_valid(struct drm_connector *connector, -- 1.8.3.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
