Re: [PATCH] drm/i915/lnl: Modeset sequence change for DP on LNL

[Jani Nikula <jani.nikula@linux.intel.com>]

On Thu, 29 Feb 2024, Shekhar Chauhan <shekhar.chauhan@intel.com> wrote:
> Currently, the driver is only waiting for 1ms for
> idle patterns. But starting from LNL and beyond,
> the MST wants the driver to wait for 1640us before
> timing out (which we round up to 2ms).
>
> BSpec: 68849
> Signed-off-by: Shekhar Chauhan <shekhar.chauhan@intel.com>

Replied in the other thread:

https://lore.kernel.org/r/878r338nhs.fsf@intel.com


> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index bea441590204..05ba3642d486 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -3680,7 +3680,7 @@ static void intel_ddi_set_idle_link_train(struct intel_dp *intel_dp,
>  
>  	if (intel_de_wait_for_set(dev_priv,
>  				  dp_tp_status_reg(encoder, crtc_state),
> -				  DP_TP_STATUS_IDLE_DONE, 1))
> +				  DP_TP_STATUS_IDLE_DONE, 2))
>  		drm_err(&dev_priv->drm,
>  			"Timed out waiting for DP idle patterns\n");
>  }

-- 
Jani Nikula, Intel