On Mon, 26 Feb 2024, Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx> wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> ADL DSI transcoders do not have the new SET_CONTEXT_LATENCY
> register. Instead they supposedly use the older TGL VBLANK_START
> based method of defining the vblank delay.
>
> Completely untested due to lack of suitable hardware.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 00ac65a14029..e9c7e9b8957a 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -2617,7 +2617,7 @@ static void intel_set_transcoder_timings(const struct intel_crtc_state *crtc_sta
> * VBLANK_START no longer works on ADL+, instead we must use
> * TRANS_SET_CONTEXT_LATENCY to configure the pipe vblank start.
> */
> - if (DISPLAY_VER(dev_priv) >= 13) {
> + if (DISPLAY_VER(dev_priv) >= 13 && !transcoder_is_dsi(cpu_transcoder)) {
> intel_de_write(dev_priv, TRANS_SET_CONTEXT_LATENCY(cpu_transcoder),
> crtc_vblank_start - crtc_vdisplay);
--
Jani Nikula, Intel
