drm/i915/vrr: Fix guardband/vblank exit length calculation for adl+

We are miscalculating both the guardband value, and the resulting
vblank exit length on adl+. This means that our start of vblank
(double buffered register latch point) is incorrect, and we also
think that it's not where it actually is (hence vblank evasion/etc.
may not work properly). Fix up the calculations to match the real
hardware behaviour (as reverse engineered by intel_display_poller).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221202134412.21943-3-ville.syrjala@linux.intel.com
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
index 6655dd2..753e7b2 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -78,10 +78,10 @@ static int intel_vrr_vblank_exit_length(const struct intel_crtc_state *crtc_stat
        struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
        struct drm_i915_private *i915 = to_i915(crtc->base.dev);
 
-       /* The hw imposes the extra scanline before frame start */
        if (DISPLAY_VER(i915) >= 13)
-               return crtc_state->vrr.guardband + crtc_state->framestart_delay + 1;
+               return crtc_state->vrr.guardband;
        else
+               /* The hw imposes the extra scanline before frame start */
                return crtc_state->vrr.pipeline_full + crtc_state->framestart_delay + 1;
 }
 
@@ -151,7 +151,7 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
                 * number of scan lines. Assuming 0 for no DSB.
                 */
                crtc_state->vrr.guardband =
-                       crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay;
+                       crtc_state->vrr.vmin + 1 - adjusted_mode->crtc_vdisplay;
        } else {
                crtc_state->vrr.pipeline_full =
                        min(255, crtc_state->vrr.vmin - adjusted_mode->crtc_vdisplay -