drm/amd/display: use a more lax vblank enable policy for DCN35+

Ideally, we want to enable immediate vblank disable, when possible and
we should be able to do so on DCN35+, if PSR isn't supported by a given
CRTC.

Suggested-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240822161856.174600-3-hamza.mahfooz@amd.com

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -8246,7 +8246,8 @@ static void manage_dm_interrupts(struct amdgpu_device *adev,
 		if (amdgpu_ip_version(adev, DCE_HWIP, 0) <
 		    IP_VERSION(3, 5, 0)) {
 			drm_crtc_vblank_on(&acrtc->base);
-		} else {
+		} else if (acrtc_state->stream->link->psr_settings.psr_version <
+			   DC_PSR_VERSION_UNSUPPORTED) {
 			timing = &acrtc_state->stream->timing;
 
 			/* at least 2 frames */
@@ -8258,6 +8259,10 @@ static void manage_dm_interrupts(struct amdgpu_device *adev,
 			config.offdelay_ms = offdelay ?: 30;
 			drm_crtc_vblank_on_config(&acrtc->base,
 						  &config);
+		} else {
+			config.disable_immediate = true;
+			drm_crtc_vblank_on_config(&acrtc->base,
+						  &config);
 		}
 
 		amdgpu_irq_get(