diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2022-12-02 15:44:10 +0200 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2022-12-08 21:33:02 +0200 |
| commit | 944bda740fc953d37d8a8a5506193c6031ecd2f9 (patch) | |
| tree | 29135f20a7c1f15cf6958f9e4b18a4175ae46c2b | |
| parent | 98f974aa3c43f862826d2c05e3844536d0972ed4 (diff) | |
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>
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_vrr.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c index 6655dd2c1684..753e7b211708 100644 --- 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 - |