linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: set AUD_CONFIG N_value

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Date:	Mon, 16 Jan 2012 21:26:18 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Keith Packard <keithp@...thp.com>, Takashi Iwai <tiwai@...e.de>,
	"intel-gfx@...ts.freedesktop..." <intel-gfx@...ts.freedesktop.org>,
	Michal Marek <mmarek@...e.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Robert Lemaire <rlemaire@...e.com>
Subject: Re: [Intel-gfx] [PATCH] drm/i915: set AUD_CONFIG N_value_index for
 DisplayPort

On Mon, Jan 16, 2012 at 04:02:53PM +0800, Wu Fengguang wrote:
> On Thu, Jan 12, 2012 at 09:33:34AM -0800, Keith Packard wrote:
> > On Tue, 10 Jan 2012 13:45:19 +0800, Wu Fengguang <fengguang.wu@...el.com> wrote:
> > 
> > > @@ -5943,6 +5947,7 @@ static void ironlake_write_eld(struct dr
> > >  	if (intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
> > >  		DRM_DEBUG_DRIVER("ELD: DisplayPort detected\n");
> > >  		eld[5] |= (1 << 2);	/* Conn_Type, 0x1 = DisplayPort */
> > > +		I915_WRITE(aud_config, AUD_CONFIG_N_VALUE_INDEX); /* 0x1 = DP */
> > >  	}
> > 
> > Do we need to clear this bit in the HDMI case? Or do we just trust the
> > BIOS to either leave this bit zero or set it correctly?
> 
> I tried booting
> 
> 1) with HDMI monitor plugged
> 2) plug HDMI monitor after BIOS boot
> 
> In both cases, I get the same AUD_CONFIG values for the host/sink matrix
> 
>                 RX-V1800        SONY TV
> ivybridge       0x00000000      0x00000000
> ironlake        0x00000000      0x00000000
> 
> HDMI audio is working fine in all cases. So I guess it's fine to leave
> HDMI as (unconfigured) 0.

Keith, does this address your concern and this patch is r-b: Keith or do
we want an

} else {
	I915_WRITE(aud_config, 0);
}

for paranoia?
-Daniel
-- 
Daniel Vetter
Mail: daniel@...ll.ch
Mobile: +41 (0)79 365 57 48
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