Re: [PATCH 15/19] drm/i915/psr: Program Panel Replay CONFIG3 using AS SDP transmission time

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Mar 30, 2026 at 09:36:52AM +0530, Ankit Nautiyal wrote:
> Panel Replay requires the AS SDP transmission time to be written into
> PANEL_REPLAY_CONFIG3. This field was previously not programmed.
> 
> Use the AS SDP transmission-time helper to populate CONFIG3.
> 
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index ca054135ca30..34b0993d9b1d 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -783,7 +783,7 @@ static void _panel_replay_enable_sink(struct intel_dp *intel_dp,
>  				      const struct intel_crtc_state *crtc_state)
>  {
>  	struct intel_display *display = to_intel_display(intel_dp);
> -	u8 panel_replay_config[2];
> +	u8 panel_replay_config[3];
>  	int ret;
>  
>  	panel_replay_config[0] = DP_PANEL_REPLAY_ENABLE |
> @@ -792,6 +792,7 @@ static void _panel_replay_enable_sink(struct intel_dp *intel_dp,
>  				 DP_PANEL_REPLAY_RFB_STORAGE_ERROR_EN |
>  				 DP_PANEL_REPLAY_ACTIVE_FRAME_CRC_ERROR_EN;
>  	panel_replay_config[1] = DP_PANEL_REPLAY_CRC_VERIFICATION;
> +	panel_replay_config[2] = intel_dp_as_sdp_transmission_time();

PANEL_REPLAY_CONFIG3 0x11a
...
PANEL_REPLAY_CONFIG1 0x1b0
PANEL_REPLAY_CONFIG2 0x1b1

So apparently we can't do the burst write for all three :/

Looks like 0x1b2 is not used for anything so don't really understand
why it wasn't added there. Oh well.

>  
>  	if (crtc_state->has_sel_update)
>  		panel_replay_config[0] |= DP_PANEL_REPLAY_SU_ENABLE;
> -- 
> 2.45.2

-- 
Ville Syrjälä
Intel