At Thu, 13 Sep 2012 11:19:00 +0800, Wang Xingchao wrote: > > Clear Audio Enable bit to trigger unsolicated event to notify Audio > Driver part the HDMI hot plug change. The patch fixed the bug when > remove HDMI cable the bit was not cleared correctly. > > In intel_enable_hdmi(), if intel_hdmi->has_audio been true, the "Audio enable bit" will > be set to trigger unsolicated event to notify Alsa driver the change. > > intel_hdmi->has_audio will be reset to false from intel_hdmi_detect() after > remove the hdmi cable, here's debug log: > > [ 187.494153] [drm:output_poll_execute], [CONNECTOR:17:HDMI-A-1] status updated from 1 to 2 > [ 187.525349] [drm:intel_hdmi_detect], HDMI: has_audio = 0 > > so when comes back to intel_disable_hdmi(), the "Audio enable bit" will not be cleared. And this > cause the eld infomation and pin presence doesnot update accordingly in alsa driver side. > > This patch will also trigger unsolicated event to alsa driver to notify the hot plug event: > > [ 187.853159] ALSA sound/pci/hda/patch_hdmi.c:772 HDMI hot plug event: Codec=3 Pin=5 Presence_Detect=0 ELD_Valid=1 > [ 187.853268] ALSA sound/pci/hda/patch_hdmi.c:990 HDMI status: Codec=3 Pin=5 Presence_Detect=0 ELD_Valid=0 > > Signed-off-by: Wang Xingchao <xingchao.wang at intel.com> We need the same fix for stable kernels, too, but unfortunately this can't be applied to 3.6 or earlier. Greg prefers still having a Cc to stable even in such a case, and then send a separate patch applicable to the existing kernels. http://lwn.net/Articles/515528/ So better to have a Cc to stable in the patch. thanks, Takashi > --- > drivers/gpu/drm/i915/intel_hdmi.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c > index 5d02aad..229897f 100644 > --- a/drivers/gpu/drm/i915/intel_hdmi.c > +++ b/drivers/gpu/drm/i915/intel_hdmi.c > @@ -674,10 +674,7 @@ static void intel_disable_hdmi(struct intel_encoder *encoder) > struct drm_i915_private *dev_priv = dev->dev_private; > struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base); > u32 temp; > - u32 enable_bits = SDVO_ENABLE; > - > - if (intel_hdmi->has_audio) > - enable_bits |= SDVO_AUDIO_ENABLE; > + u32 enable_bits = SDVO_ENABLE | SDVO_AUDIO_ENABLE; > > temp = I915_READ(intel_hdmi->sdvox_reg); > > -- > 1.7.9.5 > > _______________________________________________ > Alsa-devel mailing list > Alsa-devel at alsa-project.org > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel >
