On Mon, 12 Apr 2021, Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx> wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> 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@xxxxxxxxx>
> Fixes: 2b5a4562edd0 ("drm/i915/display: Simplify GLK display version tests")
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> 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
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