[Intel-gfx] [alsa-devel] [PATCH v2] drm/i915: HDMI - Clear Audio Enable bit for Hot Plug unconditionally

[Wang Xingchao]

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.
so i will resend that seperate patch to Greg.

The patch for 3.6 kernel:
http://lists.freedesktop.org/archives/intel-gfx/2012-September/020413.html

thanks
--xingchao
>
> 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
>>
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