[Intel-gfx] [PATCH 1/2] drm/i915/dp: there is no audio on port A on non-DDI platforms

[Sivakumar Thulasimani]

On 5/4/2015 7:50 PM, Jani Nikula wrote:
> The eDP port A register on PCH split platforms has a slightly different
> register layout from the other ports, with bit 6 being either alternate
> scrambler reset or reserved, depending on the generation. Our
> misinterpretation of the bit as audio has lead to warnings.
>
> Fix this by not enabling audio on port A on non-DDI platforms. The check
> could be made more specific, but this corresponds to the audio codec
> enabling code which emits the warning for port A.
shouldn't we disable audio for eDP on all platforms , including DDI ones ?
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89958
> Reported-and-tested-by: Chris Bainbridge <chris.bainbridge at gmail.com>
> Cc: stable at vger.kernel.org
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> ---
>   drivers/gpu/drm/i915/intel_dp.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 937ba31d8dde..fa71fb4d6542 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1355,7 +1355,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>   
>   	pipe_config->has_dp_encoder = true;
>   	pipe_config->has_drrs = false;
> -	pipe_config->has_audio = intel_dp->has_audio;
> +	if (HAS_DDI(dev) || port != PORT_A)
> +		pipe_config->has_audio = intel_dp->has_audio;
>   
this still enables audio for PORT_A on for HSW/BDW/etc .  the following 
is better IMO

+	if (!is_edp(encoder))
+		pipe_config->has_audio = intel_dp->has_audio;



-- 
regards,
Sivakumar