Re: [PATCH 06/13] drm/i915/vrr: Compute vrr vsync if platforms support it

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On 9/3/2024 6:15 PM, Ville Syrjälä wrote:
On Mon, Sep 02, 2024 at 01:36:27PM +0530, Ankit Nautiyal wrote:
Previously, TRANS_VRR_VSYNC was exclusively used for panels with
adaptive-sync SDP support in VRR scenarios. However, to drive fixed refresh
rates using the VRR Timing generator, we now need to program
TRANS_VRR_VSYNC regardless of adaptive sync SDP support. Therefore, let's
remove the adaptive sync SDP check and program TRANS_VRR_VSYNC for
platforms where VRR timing generator is used.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
---
  drivers/gpu/drm/i915/display/intel_vrr.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 9a51f5bac307..03af50b9f9eb 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -231,7 +231,7 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
  		crtc_state->mode_flags |= I915_MODE_FLAG_VRR;
  	}
- if (intel_dp->as_sdp_supported && crtc_state->vrr.enable) {
+	if (HAS_AS_SDP(display) && crtc_state->vrr.enable) {
That vrr.enable check should be nuked as well. We are supposed to
compute the full state whether VRR is actually enabled or not.

Hmm. We are trying to move to VRR TG from LNL+ so for these platform vrr.enable will always be set. For older platforms where vrr.enable is not set, whether enabling TRANS_VRR_VSYNC can cause any issue? If this is set and TRANS_VRR_CTL is disable, then perhaps it wont have any effect.

Regards,

Ankit



  		crtc_state->vrr.vsync_start =
  			(crtc_state->hw.adjusted_mode.crtc_vtotal -
  			 crtc_state->hw.adjusted_mode.vsync_start);
--
2.45.2



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