[Intel-gfx] [PATCH v5] drm/i915: pass ELD to HDMI/DP audio driver

[Wu Fengguang]

Hi Christopher,

Sorry I'm just back from traveling..

On Fri, Oct 28, 2011 at 03:54:23AM +0800, Christopher White wrote:
> There appears to be some issues with the patch? I'm on SandyBridge and 
> using the HD3000's HDMI.
> 
> I've now tried manually merging the ELD patch (both files Wu Fengguang 
> submitted) and compiling Kernel 3.0.4. I've also tried drm-intel-next 
> Kernel 3.1 pre-built from 
> http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/current/ as 
> I knew it was built from keithp's latest drm-intel-next repository.
> 
> Both of these methods had the patch applied, yet neither were able to 
> read the ELD correctly from my Onkyo TX-SR607 receiver.
> 
> If I manually dump the EDID from my receiver and analyze it with Monitor 
> Asset Manager (by EnTech Taiwan), it shows that the ELD contains an 8 
> channel specification up to 192 kHz, and that's what's being exposed 
> over HDMI to the Intel graphics adapter, yet this isn't detected. It 
> just plain isn't being read, and is falling back to the default 2ch 
> 16kHz configuration. It's exactly as it was in the past, before this 
> patch attempt.
> 
> You can see my 256 byte EDID dump, straight from the receiver, over at:
> http://www.pulseforce.com/node/edid.dump
> 
> It shows exactly what the receiver is exposing over HDMI, proving that 
> it's not the device that's at fault.
> 
> Any ideas what's wrong? Here's the HDMI messages from the startup log:

Would you boot the kernel with drm.debug=6 and post the dmesg?
That will show more details.

One possible problem is the hardware reports small ELD buffer size
which truncates the additional 8-channel information.

Thanks,
Fengguang

> HDMI status: Pin=7 Presence_Detect=1 ELD_Valid=1
> HDMI: detected monitor  at connection type HDMI
> HDMI: available speakers: FL/FR
> HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 
> 88200, bits = 16
> HDMI hot plug event: Pin=7 Presence_Detect=1 ELD_Valid=1
> HDMI status: Pin=7 Presence_Detect=1 ELD_Valid=1
> input: HDA Intel PCH HDMI/DP as 
> /devices/pci0000:00/0000:00:1b.0/sound/card0/input9
> HDMI: detected monitor  at connection type HDMI
> HDMI: available speakers: FL/FR
> HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 
> 88200, bits = 16
> HDMI hot plug event: Pin=7 Presence_Detect=1 ELD_Valid=1
> HDMI status: Pin=7 Presence_Detect=1 ELD_Valid=1
> HDMI: detected monitor  at connection type HDMI
> HDMI: available speakers: FL/FR
> HDMI: supports coding type LPCM: channels = 2, rates = 44100 48000 
> 88200, bits = 16
> 
> 
> 
> Christopher White