[PATCH 03/36] drm/i915: Fix skl+ non-scaled pfit modes

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Fix skl_update_scaler_crtc() to deal with different scaling
modes correctly. The current implementation assumes
DRM_MODE_SCALE_FULLSCREEN. Fortunately we don't expose any
border properties currently so the code does actually end
up doing the right thing (assigning a scaler for pfit).
The code does need to be fixed before any borders are
exposed.

Also we have redundant calls to skl_update_scaler_crtc() in
dp/hdmi .compute_config() which can be nuked. They were anyway
called before we had even computed the pfit state so were
basically nonsense. The real call we need to keep is in
intel_crtc_atomic_check().

v2: Deal witrh skl_update_scaler_crtc() in intel_dp_ycbcr420_config()

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 38 ++++++++++----------
 drivers/gpu/drm/i915/display/intel_display.h |  1 -
 drivers/gpu/drm/i915/display/intel_dp.c      | 15 --------
 drivers/gpu/drm/i915/display/intel_hdmi.c    |  6 ----
 4 files changed, 19 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index fa9c2f2778ef..03a6ec812766 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5637,28 +5637,28 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
 	return 0;
 }
 
-/**
- * skl_update_scaler_crtc - Stages update to scaler state for a given crtc.
- *
- * @state: crtc's scaler state
- *
- * Return
- *     0 - scaler_usage updated successfully
- *    error - requested scaling cannot be supported or other error condition
- */
-int skl_update_scaler_crtc(struct intel_crtc_state *state)
+static int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state)
 {
-	const struct drm_display_mode *adjusted_mode = &state->hw.adjusted_mode;
-	bool need_scaler = false;
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int width, height;
 
-	if (state->output_format == INTEL_OUTPUT_FORMAT_YCBCR420)
-		need_scaler = true;
+	if (crtc_state->pch_pfit.enabled) {
+		u32 pfit_size = crtc_state->pch_pfit.size;
+
+		width = pfit_size >> 16;
+		height = pfit_size & 0xffff;
+	} else {
+		width = adjusted_mode->crtc_hdisplay;
+		height = adjusted_mode->crtc_vdisplay;
+	}
 
-	return skl_update_scaler(state, !state->hw.active, SKL_CRTC_INDEX,
-				 &state->scaler_state.scaler_id,
-				 state->pipe_src_w, state->pipe_src_h,
-				 adjusted_mode->crtc_hdisplay,
-				 adjusted_mode->crtc_vdisplay, NULL, need_scaler);
+	return skl_update_scaler(crtc_state, !crtc_state->hw.active,
+				 SKL_CRTC_INDEX,
+				 &crtc_state->scaler_state.scaler_id,
+				 crtc_state->pipe_src_w, crtc_state->pipe_src_h,
+				 width, height, NULL,
+				 crtc_state->pch_pfit.enabled);
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h
index ff496cfbd4ab..0443ea1d2415 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -577,7 +577,6 @@ void intel_crtc_arm_fifo_underrun(struct intel_crtc *crtc,
 				  struct intel_crtc_state *crtc_state);
 
 u16 skl_scaler_calc_phase(int sub, int scale, bool chroma_center);
-int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state);
 void skylake_scaler_disable(const struct intel_crtc_state *old_crtc_state);
 void ironlake_pfit_disable(const struct intel_crtc_state *old_crtc_state);
 u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 2f31d226c6eb..f6edf53127fd 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2294,7 +2294,6 @@ intel_dp_ycbcr420_config(struct intel_dp *intel_dp,
 	const struct drm_display_mode *adjusted_mode =
 		&crtc_state->hw.adjusted_mode;
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
-	int ret;
 
 	if (!drm_mode_is_420_only(info, adjusted_mode) ||
 	    !intel_dp_get_colorimetry_status(intel_dp) ||
@@ -2303,13 +2302,6 @@ intel_dp_ycbcr420_config(struct intel_dp *intel_dp,
 
 	crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;
 
-	/* YCBCR 420 output conversion needs a scaler */
-	ret = skl_update_scaler_crtc(crtc_state);
-	if (ret) {
-		DRM_DEBUG_KMS("Scaler allocation for output failed\n");
-		return ret;
-	}
-
 	intel_pch_panel_fitting(crtc, crtc_state, DRM_MODE_SCALE_FULLSCREEN);
 
 	return 0;
@@ -2387,7 +2379,6 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	else
 		ret = intel_dp_ycbcr420_config(intel_dp, &intel_connector->base,
 					       pipe_config);
-
 	if (ret)
 		return ret;
 
@@ -2403,12 +2394,6 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 		intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
 				       adjusted_mode);
 
-		if (INTEL_GEN(dev_priv) >= 9) {
-			ret = skl_update_scaler_crtc(pipe_config);
-			if (ret)
-				return ret;
-		}
-
 		if (HAS_GMCH(dev_priv))
 			intel_gmch_panel_fitting(intel_crtc, pipe_config,
 						 conn_state->scaling_mode);
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index a89a09b25260..a6ff81a421d9 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2290,12 +2290,6 @@ intel_hdmi_ycbcr420_config(struct drm_connector *connector,
 
 	config->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;
 
-	/* YCBCR 420 output conversion needs a scaler */
-	if (skl_update_scaler_crtc(config)) {
-		DRM_DEBUG_KMS("Scaler allocation for output failed\n");
-		return false;
-	}
-
 	intel_pch_panel_fitting(intel_crtc, config,
 				DRM_MODE_SCALE_FULLSCREEN);
 
-- 
2.23.0