drm/i915/dsc: stop using interim structure for calculated params

Stop using an interim structure rc_parameters for storing calculated
params and then setting drm_dsc_config using that structure. Instead put
calculated params into the struct drm_dsc_config directly.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230517102807.2181589-5-dmitry.baryshkov@linaro.org

drivers/gpu/drm/i915/display/intel_vdsc.c

@@ -19,17 +19,6 @@
 #include "intel_vdsc.h"
 #include "intel_vdsc_regs.h"
 
-struct rc_parameters {
-	u16 initial_xmit_delay;
-	u8 first_line_bpg_offset;
-	u16 initial_offset;
-	u8 flatness_min_qp;
-	u8 flatness_max_qp;
-	u8 rc_quant_incr_limit0;
-	u8 rc_quant_incr_limit1;
-	struct drm_dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES];
-};
-
 bool intel_dsc_source_support(const struct intel_crtc_state *crtc_state)
 {
 	const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -64,8 +53,7 @@ static bool is_pipe_dsc(struct intel_crtc *crtc, enum transcoder cpu_transcoder)
 }
 
 static void
-calculate_rc_params(struct rc_parameters *rc,
-		    struct drm_dsc_config *vdsc_cfg)
+calculate_rc_params(struct drm_dsc_config *vdsc_cfg)
 {
 	int bpc = vdsc_cfg->bits_per_component;
 	int bpp = vdsc_cfg->bits_per_pixel >> 4;
@@ -85,56 +73,57 @@ calculate_rc_params(struct rc_parameters *rc,
 	u32 res, buf_i, bpp_i;
 
 	if (vdsc_cfg->slice_height >= 8)
-		rc->first_line_bpg_offset =
+		vdsc_cfg->first_line_bpg_offset =
 			12 + DIV_ROUND_UP((9 * min(34, vdsc_cfg->slice_height - 8)), 100);
 	else
-		rc->first_line_bpg_offset = 2 * (vdsc_cfg->slice_height - 1);
+		vdsc_cfg->first_line_bpg_offset = 2 * (vdsc_cfg->slice_height - 1);
 
 	/* Our hw supports only 444 modes as of today */
 	if (bpp >= 12)
-		rc->initial_offset = 2048;
+		vdsc_cfg->initial_offset = 2048;
 	else if (bpp >= 10)
-		rc->initial_offset = 5632 - DIV_ROUND_UP(((bpp - 10) * 3584), 2);
+		vdsc_cfg->initial_offset = 5632 - DIV_ROUND_UP(((bpp - 10) * 3584), 2);
 	else if (bpp >= 8)
-		rc->initial_offset = 6144 - DIV_ROUND_UP(((bpp - 8) * 512), 2);
+		vdsc_cfg->initial_offset = 6144 - DIV_ROUND_UP(((bpp - 8) * 512), 2);
 	else
-		rc->initial_offset = 6144;
+		vdsc_cfg->initial_offset = 6144;
 
 	/* initial_xmit_delay = rc_model_size/2/compression_bpp */
-	rc->initial_xmit_delay = DIV_ROUND_UP(DSC_RC_MODEL_SIZE_CONST, 2 * bpp);
+	vdsc_cfg->initial_xmit_delay = DIV_ROUND_UP(DSC_RC_MODEL_SIZE_CONST, 2 * bpp);
 
-	rc->flatness_min_qp = 3 + qp_bpc_modifier;
-	rc->flatness_max_qp = 12 + qp_bpc_modifier;
+	vdsc_cfg->flatness_min_qp = 3 + qp_bpc_modifier;
+	vdsc_cfg->flatness_max_qp = 12 + qp_bpc_modifier;
 
-	rc->rc_quant_incr_limit0 = 11 + qp_bpc_modifier;
-	rc->rc_quant_incr_limit1 = 11 + qp_bpc_modifier;
+	vdsc_cfg->rc_quant_incr_limit0 = 11 + qp_bpc_modifier;
+	vdsc_cfg->rc_quant_incr_limit1 = 11 + qp_bpc_modifier;
 
 	bpp_i  = (2 * (bpp - 6));
 	for (buf_i = 0; buf_i < DSC_NUM_BUF_RANGES; buf_i++) {
+		u8 range_bpg_offset;
+
 		/* Read range_minqp and range_max_qp from qp tables */
-		rc->rc_range_params[buf_i].range_min_qp =
+		vdsc_cfg->rc_range_params[buf_i].range_min_qp =
 			intel_lookup_range_min_qp(bpc, buf_i, bpp_i, vdsc_cfg->native_420);
-		rc->rc_range_params[buf_i].range_max_qp =
+		vdsc_cfg->rc_range_params[buf_i].range_max_qp =
 			intel_lookup_range_max_qp(bpc, buf_i, bpp_i, vdsc_cfg->native_420);
 
-		/* Calculate range_bgp_offset */
+		/* Calculate range_bpg_offset */
 		if (bpp <= 6) {
-			rc->rc_range_params[buf_i].range_bpg_offset = ofs_und6[buf_i];
+			range_bpg_offset = ofs_und6[buf_i];
 		} else if (bpp <= 8) {
 			res = DIV_ROUND_UP(((bpp - 6) * (ofs_und8[buf_i] - ofs_und6[buf_i])), 2);
-			rc->rc_range_params[buf_i].range_bpg_offset =
-								ofs_und6[buf_i] + res;
+			range_bpg_offset = ofs_und6[buf_i] + res;
 		} else if (bpp <= 12) {
-			rc->rc_range_params[buf_i].range_bpg_offset =
-								ofs_und8[buf_i];
+			range_bpg_offset = ofs_und8[buf_i];
 		} else if (bpp <= 15) {
 			res = DIV_ROUND_UP(((bpp - 12) * (ofs_und15[buf_i] - ofs_und12[buf_i])), 3);
-			rc->rc_range_params[buf_i].range_bpg_offset =
-								ofs_und12[buf_i] + res;
+			range_bpg_offset = ofs_und12[buf_i] + res;
 		} else {
-			rc->rc_range_params[buf_i].range_bpg_offset =
-								ofs_und15[buf_i];
+			range_bpg_offset = ofs_und15[buf_i];
 		}
+
+		vdsc_cfg->rc_range_params[buf_i].range_bpg_offset =
+			range_bpg_offset & DSC_RANGE_BPG_OFFSET_MASK;
 	}
 }
 
@@ -167,10 +156,7 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	struct drm_dsc_config *vdsc_cfg = &pipe_config->dsc.config;
 	u16 compressed_bpp = pipe_config->dsc.compressed_bpp;
-	const struct rc_parameters *rc_params;
-	struct rc_parameters *rc = NULL;
 	int err;
-	u8 i = 0;
 	int ret;
 
 	vdsc_cfg->pic_width = pipe_config->hw.adjusted_mode.crtc_hdisplay;
@@ -238,43 +224,12 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 	 * parameters
 	 */
 	if (DISPLAY_VER(dev_priv) >= 13) {
-		rc = kmalloc(sizeof(*rc), GFP_KERNEL);
-		if (!rc)
-			return -ENOMEM;
-
-		calculate_rc_params(rc, vdsc_cfg);
-		rc_params = rc;
+		calculate_rc_params(vdsc_cfg);
 	} else {
 		ret = drm_dsc_setup_rc_params(vdsc_cfg);
 		if (ret)
 			return ret;
 
-		goto out;
-	}
-
-	vdsc_cfg->first_line_bpg_offset = rc_params->first_line_bpg_offset;
-	vdsc_cfg->initial_xmit_delay = rc_params->initial_xmit_delay;
-	vdsc_cfg->initial_offset = rc_params->initial_offset;
-	vdsc_cfg->flatness_min_qp = rc_params->flatness_min_qp;
-	vdsc_cfg->flatness_max_qp = rc_params->flatness_max_qp;
-	vdsc_cfg->rc_quant_incr_limit0 = rc_params->rc_quant_incr_limit0;
-	vdsc_cfg->rc_quant_incr_limit1 = rc_params->rc_quant_incr_limit1;
-
-	for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
-		vdsc_cfg->rc_range_params[i].range_min_qp =
-			rc_params->rc_range_params[i].range_min_qp;
-		vdsc_cfg->rc_range_params[i].range_max_qp =
-			rc_params->rc_range_params[i].range_max_qp;
-		/*
-		 * Range BPG Offset uses 2's complement and is only a 6 bits. So
-		 * mask it to get only 6 bits.
-		 */
-		vdsc_cfg->rc_range_params[i].range_bpg_offset =
-			rc_params->rc_range_params[i].range_bpg_offset &
-			DSC_RANGE_BPG_OFFSET_MASK;
-	}
-
-	if (DISPLAY_VER(dev_priv) < 13) {
 		/*
 		 * FIXME: verify that the hardware actually needs these
 		 * modifications rather than them being simple typos.
@@ -288,7 +243,6 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 			vdsc_cfg->rc_range_params[0].range_bpg_offset = 0;
 	}
 
-out:
 	/*
 	 * BitsPerComponent value determines mux_word_size:
 	 * When BitsPerComponent is less than or 10bpc, muxWordSize will be equal to
@@ -303,8 +257,6 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 	vdsc_cfg->initial_scale_value = (vdsc_cfg->rc_model_size << 3) /
 		(vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset);
 
-	kfree(rc);
-
 	return 0;
 }