[Intel-gfx] [PATCH] drm/i915/glk: ECS Liva Q2 needs GLK HDMI port timing quirk

[Ville Syrjälä]

On Thu, Jun 16, 2022 at 03:41:37PM +0300, Jani Nikula wrote:
> From: Diego Santa Cruz <Diego.SantaCruz at spinetix.com>
> 
> The quirk added in upstream commit 90c3e2198777 ("drm/i915/glk: Add
> Quirk for GLK NUC HDMI port issues.") is also required on the ECS Liva
> Q2.
> 
> Note: Would be nicer to figure out the extra delay required for the
> retimer without quirks, however don't know how to check for that.
> 
> Cc: stable at vger.kernel.org
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1326
> Signed-off-by: Diego Santa Cruz <Diego.SantaCruz at spinetix.com>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>

Seems fine. Although I do wonder whether we could directly identify the
bogus retimer chip via the dual mode adapter registers. I've asked for
that in the bug.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_quirks.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c b/drivers/gpu/drm/i915/display/intel_quirks.c
> index c8488f5ebd04..e415cd7c0b84 100644
> --- a/drivers/gpu/drm/i915/display/intel_quirks.c
> +++ b/drivers/gpu/drm/i915/display/intel_quirks.c
> @@ -191,6 +191,9 @@ static struct intel_quirk intel_quirks[] = {
>  	/* ASRock ITX*/
>  	{ 0x3185, 0x1849, 0x2212, quirk_increase_ddi_disabled_time },
>  	{ 0x3184, 0x1849, 0x2212, quirk_increase_ddi_disabled_time },
> +	/* ECS Liva Q2 */
> +	{ 0x3185, 0x1019, 0xa94d, quirk_increase_ddi_disabled_time },
> +	{ 0x3184, 0x1019, 0xa94d, quirk_increase_ddi_disabled_time },
>  };
>  
>  void intel_init_quirks(struct drm_i915_private *i915)
> -- 
> 2.30.2

-- 
Ville Syrjälä
Intel