[Intel-gfx] [PATCH 3/5] drm/i915: Disable LTTPR detection on GLK once again

[Jani Nikula]

On Mon, 12 Apr 2021, Ville Syrjala <ville.syrjala at linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> The glk display version change is causing us to again attempt
> LTTPR detection on glk. We must not do tha since glk doesn't
> have a long enough AUX timeout. Restore the correct logic to
> skip the detection.
>
> Cc: Matt Roper <matthew.d.roper at intel.com>
> Fixes: 2b5a4562edd0 ("drm/i915/display: Simplify GLK display version tests")
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dp_link_training.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> index 5e9c3c74310c..597634e4f35f 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> @@ -96,7 +96,7 @@ static bool intel_dp_read_lttpr_common_caps(struct intel_dp *intel_dp)
>  	 * Detecting LTTPRs must be avoided on platforms with an AUX timeout
>  	 * period < 3.2ms. (see DP Standard v2.0, 2.11.2, 3.6.6.1).
>  	 */
> -	if (DISPLAY_VER(i915) < 10)
> +	if (DISPLAY_VER(i915) < 10 || IS_GEMINILAKE(i915))
>  		return false;
>  
>  	if (drm_dp_read_lttpr_common_caps(&intel_dp->aux,

-- 
Jani Nikula, Intel Open Source Graphics Center