Check if vblank is too short for scaler prefill latency.
Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/skl_watermark.c | 22 ++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
index d3506e8ccd9b..a538e2b82c12 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -2292,6 +2292,27 @@ static int icl_build_plane_wm(struct intel_crtc_state *crtc_state,
return 0;
}
+static int
+scaler_prefill_time(const struct intel_crtc_state *crtc_state)
+{
+ const struct intel_crtc_scaler_state *scaler_state =
+ &crtc_state->scaler_state;
+ int scaler_users = scaler_state->scaler_users;
+ int count = 0;
+ int hscale = scaler_state->scalers[0].hscale;
+ int vscale = scaler_state->scalers[0].vscale;
+
+ while (scaler_users) {
+ count += scaler_users & 1;
+ scaler_users >>= 1;
+ }
+
+ if (count > 1)
+ return (4 * crtc_state->linetime * hscale * vscale);
+ else
+ return (4 * crtc_state->linetime);
+}
+
static bool
skl_is_vblank_too_short(const struct intel_crtc_state *crtc_state,
int wm0_lines, int latency)
@@ -2302,6 +2323,7 @@ skl_is_vblank_too_short(const struct intel_crtc_state *crtc_state,
/* FIXME missing scaler and DSC pre-fill time */
return crtc_state->framestart_delay +
intel_usecs_to_scanlines(adjusted_mode, latency) +
+ scaler_prefill_time(crtc_state) +
wm0_lines >
adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vblank_start;
}
--
2.46.0
