[alsa-devel] [PATCH v2] drm/i915: HDMI - Clear Audio Enable bit for Hot Plug unconditionally
tiwai at suse.de
Thu Sep 13 16:00:34 CEST 2012
At Thu, 13 Sep 2012 21:53:12 +0800,
Wang Xingchao wrote:
> Hi Takashi,
> 2012/9/13 Takashi Iwai <tiwai at suse.de>:
> > 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.
> I had another patch against 3.6 kernel, I send it out at first. This
> v2 version is based on Daniel's drm-intel-next branch.
I know. But my point is to put a Cc line into the patch itself.
> so i will resend that seperate patch to Greg.
FYI, sending a separate stable patch would be better done once after
the original patch gets merged to Linus tree and Greg pings you due
to a cherry-pick failure. As a rule of thumb, all stable patches
must be merged to Linus tree at first.
But, this makes me wonder why this patch can't go into 3.6. It's a
clear bug and the fix is trivial.
Daniel, isn't it better to pick the fix (for 3.6) to drm-intel-fixes,
then merge back to drm-intel-next?
> The patch for 3.6 kernel:
> > 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);
> >> --
> >> 126.96.36.199
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