[PATCH] drm/edid: Add EDID_QUIRK_FORCE_8BPC quirk for Rotel RSX-1058

[Ville Syrjälä]

On Mon, Feb 20, 2017 at 04:25:45PM +0100, Tomeu Vizoso wrote:
> Rotel RSX-1058 is a receiver with 4 HDMI inputs and a HDMI output, all
> 1.1.
> 
> When a sink that supports deep color is connected to the output, the
> receiver will send EDIDs that advertise this capability, even if it
> isn't possible with HDMI versions earlier than 1.3.
> 
> Currently the kernel is assuming that deep color is possible and the
> sink displays an error.
> 
> This quirk will make sure that deep color isn't used with this
> particular receiver.
> 
> Fixes: 7a0baa623446 ("Revert "drm/i915: Disable 12bpc hdmi for now"")
> References: https://bugs.freedesktop.org/show_bug.cgi?id=99869
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso at collabora.com>

Cc: stable at vger.kernel.org
Cc: Matt Horan <matt at matthoran.com>
Tested-by: Matt Horan <matt at matthoran.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99869
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/drm_edid.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 24e7b282f16c..d994ccf94f88 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -148,6 +148,9 @@ static const struct edid_quirk {
>  
>  	/* Panel in Samsung NP700G7A-S01PL notebook reports 6bpc */
>  	{ "SEC", 0xd033, EDID_QUIRK_FORCE_8BPC },
> +
> +	/* Rotel RSX-1058 forwards sink's EDID but only does HDMI 1.1*/
> +	{ "ETR", 13896, EDID_QUIRK_FORCE_8BPC },
>  };
>  
>  /*
> -- 
> 2.9.3
> 
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-- 
Ville Syrjälä
Intel OTC