drm/msm/dpu: add support for clk and bw scaling for display

This change adds support to scale src clk and bandwidth as
per composition requirements.

Interconnect registration for bw has been moved to mdp
device node from mdss to facilitate the scaling.

Signed-off-by: Kalyan Thota <kalyan_t@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

Author: Kalyan Thota

drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c

@@ -29,6 +29,73 @@ enum dpu_perf_mode {
 	DPU_PERF_MODE_MAX
 };
 
+/**
+ * @_dpu_core_perf_calc_bw() - to calculate BW per crtc
+ * @kms -  pointer to the dpu_kms
+ * @crtc - pointer to a crtc
+ * Return: returns aggregated BW for all planes in crtc.
+ */
+static u64 _dpu_core_perf_calc_bw(struct dpu_kms *kms,
+		struct drm_crtc *crtc)
+{
+	struct drm_plane *plane;
+	struct dpu_plane_state *pstate;
+	u64 crtc_plane_bw = 0;
+	u32 bw_factor;
+
+	drm_atomic_crtc_for_each_plane(plane, crtc) {
+		pstate = to_dpu_plane_state(plane->state);
+
+		if (!pstate)
+			continue;
+
+		crtc_plane_bw += pstate->plane_fetch_bw;
+	}
+
+	bw_factor = kms->catalog->perf.bw_inefficiency_factor;
+	if (bw_factor)
+		crtc_plane_bw = mult_frac(crtc_plane_bw, bw_factor, 100);
+
+	return crtc_plane_bw;
+}
+
+/**
+ * _dpu_core_perf_calc_clk() - to calculate clock per crtc
+ * @kms -  pointer to the dpu_kms
+ * @crtc - pointer to a crtc
+ * @state - pointer to a crtc state
+ * Return: returns max clk for all planes in crtc.
+ */
+static u64 _dpu_core_perf_calc_clk(struct dpu_kms *kms,
+		struct drm_crtc *crtc, struct drm_crtc_state *state)
+{
+	struct drm_plane *plane;
+	struct dpu_plane_state *pstate;
+	struct drm_display_mode *mode;
+	u64 crtc_clk;
+	u32 clk_factor;
+
+	mode = &state->adjusted_mode;
+
+	crtc_clk = mode->vtotal * mode->hdisplay * drm_mode_vrefresh(mode);
+
+	drm_atomic_crtc_for_each_plane(plane, crtc) {
+		pstate = to_dpu_plane_state(plane->state);
+
+		if (!pstate)
+			continue;
+
+		crtc_clk = max(pstate->plane_clk, crtc_clk);
+	}
+
+	clk_factor = kms->catalog->perf.clk_inefficiency_factor;
+	if (clk_factor)
+		crtc_clk = mult_frac(crtc_clk, clk_factor, 100);
+
+	return crtc_clk;
+}
+
+
 static struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
 {
 	struct msm_drm_private *priv;
@@ -67,19 +134,18 @@ static void _dpu_core_perf_calc_crtc(struct dpu_kms *kms,
 	dpu_cstate = to_dpu_crtc_state(state);
 	memset(perf, 0, sizeof(struct dpu_core_perf_params));
 
-	if (!dpu_cstate->bw_control) {
-		perf->bw_ctl = kms->catalog->perf.max_bw_high *
-					1000ULL;
-		perf->max_per_pipe_ib = perf->bw_ctl;
-		perf->core_clk_rate = kms->perf.max_core_clk_rate;
-	} else if (kms->perf.perf_tune.mode == DPU_PERF_MODE_MINIMUM) {
+	if (kms->perf.perf_tune.mode == DPU_PERF_MODE_MINIMUM) {
 		perf->bw_ctl = 0;
 		perf->max_per_pipe_ib = 0;
 		perf->core_clk_rate = 0;
 	} else if (kms->perf.perf_tune.mode == DPU_PERF_MODE_FIXED) {
 		perf->bw_ctl = kms->perf.fix_core_ab_vote;
 		perf->max_per_pipe_ib = kms->perf.fix_core_ib_vote;
 		perf->core_clk_rate = kms->perf.fix_core_clk_rate;
+	} else {
+		perf->bw_ctl = _dpu_core_perf_calc_bw(kms, crtc);
+		perf->max_per_pipe_ib = kms->catalog->perf.min_dram_ib;
+		perf->core_clk_rate = _dpu_core_perf_calc_clk(kms, crtc, state);
 	}
 
 	DPU_DEBUG(
@@ -132,11 +198,7 @@ int dpu_core_perf_crtc_check(struct drm_crtc *crtc,
 			DPU_DEBUG("crtc:%d bw:%llu ctrl:%d\n",
 				tmp_crtc->base.id, tmp_cstate->new_perf.bw_ctl,
 				tmp_cstate->bw_control);
-			/*
-			 * For bw check only use the bw if the
-			 * atomic property has been already set
-			 */
-			if (tmp_cstate->bw_control)
+
 				bw_sum_of_intfs += tmp_cstate->new_perf.bw_ctl;
 		}
 
@@ -152,9 +214,7 @@ int dpu_core_perf_crtc_check(struct drm_crtc *crtc,
 
 		DPU_DEBUG("final threshold bw limit = %d\n", threshold);
 
-		if (!dpu_cstate->bw_control) {
-			DPU_DEBUG("bypass bandwidth check\n");
-		} else if (!threshold) {
+		if (!threshold) {
 			DPU_ERROR("no bandwidth limits specified\n");
 			return -E2BIG;
 		} else if (bw > threshold) {
@@ -175,7 +235,8 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms,
 					= dpu_crtc_get_client_type(crtc);
 	struct drm_crtc *tmp_crtc;
 	struct dpu_crtc_state *dpu_cstate;
-	int ret = 0;
+	int i, ret = 0;
+	u64 avg_bw;
 
 	drm_for_each_crtc(tmp_crtc, crtc->dev) {
 		if (tmp_crtc->enabled &&
@@ -186,10 +247,21 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms,
 			perf.max_per_pipe_ib = max(perf.max_per_pipe_ib,
 					dpu_cstate->new_perf.max_per_pipe_ib);
 
-			DPU_DEBUG("crtc=%d bw=%llu\n", tmp_crtc->base.id,
-					dpu_cstate->new_perf.bw_ctl);
+			perf.bw_ctl += dpu_cstate->new_perf.bw_ctl;
+
+			DPU_DEBUG("crtc=%d bw=%llu paths:%d\n",
+				  tmp_crtc->base.id,
+				  dpu_cstate->new_perf.bw_ctl, kms->num_paths);
 		}
 	}
+
+	avg_bw = kms->num_paths ?
+			perf.bw_ctl / kms->num_paths : 0;
+
+	for (i = 0; i < kms->num_paths; i++)
+		icc_set_bw(kms->path[i],
+			Bps_to_icc(avg_bw), (perf.max_per_pipe_ib));
+
 	return ret;
 }
 

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c

@@ -541,7 +541,8 @@ static const struct dpu_perf_cfg sc7180_perf_data = {
 	.max_bw_high = 5500000,
 	.min_core_ib = 2400000,
 	.min_llcc_ib = 800000,
-	.min_dram_ib = 800000,
+	.min_dram_ib = 1600000,
+	.min_prefill_lines = 24,
 	.danger_lut_tbl = {0xff, 0xffff, 0x0},
 	.qos_lut_tbl = {
 		{.nentry = ARRAY_SIZE(sc7180_qos_linear),
@@ -558,6 +559,8 @@ static const struct dpu_perf_cfg sc7180_perf_data = {
 		{.rd_enable = 1, .wr_enable = 1},
 		{.rd_enable = 1, .wr_enable = 0}
 	},
+	.clk_inefficiency_factor = 105,
+	.bw_inefficiency_factor = 120,
 };
 
 /*************************************************************

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h

@@ -651,6 +651,8 @@ struct dpu_perf_cdp_cfg {
  * @downscaling_prefill_lines  downscaling latency in lines
  * @amortizable_theshold minimum y position for traffic shaping prefill
  * @min_prefill_lines  minimum pipeline latency in lines
+ * @clk_inefficiency_factor DPU src clock inefficiency factor
+ * @bw_inefficiency_factor DPU axi bus bw inefficiency factor
  * @safe_lut_tbl: LUT tables for safe signals
  * @danger_lut_tbl: LUT tables for danger signals
  * @qos_lut_tbl: LUT tables for QoS signals
@@ -675,6 +677,8 @@ struct dpu_perf_cfg {
 	u32 downscaling_prefill_lines;
 	u32 amortizable_threshold;
 	u32 min_prefill_lines;
+	u32 clk_inefficiency_factor;
+	u32 bw_inefficiency_factor;
 	u32 safe_lut_tbl[DPU_QOS_LUT_USAGE_MAX];
 	u32 danger_lut_tbl[DPU_QOS_LUT_USAGE_MAX];
 	struct dpu_qos_lut_tbl qos_lut_tbl[DPU_QOS_LUT_USAGE_MAX];

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

@@ -303,6 +303,28 @@ static int dpu_kms_global_obj_init(struct dpu_kms *dpu_kms)
 	return 0;
 }
 
+static int dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms)
+{
+	struct icc_path *path0;
+	struct icc_path *path1;
+	struct drm_device *dev = dpu_kms->dev;
+
+	path0 = of_icc_get(dev->dev, "mdp0-mem");
+	path1 = of_icc_get(dev->dev, "mdp1-mem");
+
+	if (IS_ERR_OR_NULL(path0))
+		return PTR_ERR_OR_ZERO(path0);
+
+	dpu_kms->path[0] = path0;
+	dpu_kms->num_paths = 1;
+
+	if (!IS_ERR_OR_NULL(path1)) {
+		dpu_kms->path[1] = path1;
+		dpu_kms->num_paths++;
+	}
+	return 0;
+}
+
 static int dpu_kms_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
 {
 	return dpu_crtc_vblank(crtc, true);
@@ -980,6 +1002,9 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 
 	dpu_vbif_init_memtypes(dpu_kms);
 
+	if (of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss"))
+		dpu_kms_parse_data_bus_icc_path(dpu_kms);
+
 	pm_runtime_put_sync(&dpu_kms->pdev->dev);
 
 	return 0;
@@ -1085,7 +1110,7 @@ static int dpu_dev_remove(struct platform_device *pdev)
 
 static int __maybe_unused dpu_runtime_suspend(struct device *dev)
 {
-	int rc = -1;
+	int i, rc = -1;
 	struct platform_device *pdev = to_platform_device(dev);
 	struct dpu_kms *dpu_kms = platform_get_drvdata(pdev);
 	struct dss_module_power *mp = &dpu_kms->mp;
@@ -1094,6 +1119,9 @@ static int __maybe_unused dpu_runtime_suspend(struct device *dev)
 	if (rc)
 		DPU_ERROR("clock disable failed rc:%d\n", rc);
 
+	for (i = 0; i < dpu_kms->num_paths; i++)
+		icc_set_bw(dpu_kms->path[i], 0, 0);
+
 	return rc;
 }
 
@@ -1105,8 +1133,15 @@ static int __maybe_unused dpu_runtime_resume(struct device *dev)
 	struct drm_encoder *encoder;
 	struct drm_device *ddev;
 	struct dss_module_power *mp = &dpu_kms->mp;
+	int i;
 
 	ddev = dpu_kms->dev;
+
+	/* Min vote of BW is required before turning on AXI clk */
+	for (i = 0; i < dpu_kms->num_paths; i++)
+		icc_set_bw(dpu_kms->path[i], 0,
+			dpu_kms->catalog->perf.min_dram_ib);
+
 	rc = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
 	if (rc) {
 		DPU_ERROR("clock enable failed rc:%d\n", rc);

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h

@@ -8,6 +8,8 @@
 #ifndef __DPU_KMS_H__
 #define __DPU_KMS_H__
 
+#include <linux/interconnect.h>
+
 #include <drm/drm_drv.h>
 
 #include "msm_drv.h"
@@ -137,6 +139,8 @@ struct dpu_kms {
 	 * when disabled.
 	 */
 	atomic_t bandwidth_ref;
+	struct icc_path *path[2];
+	u32 num_paths;
 };
 
 struct vsync_info {

drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c

@@ -8,7 +8,6 @@
 #include <linux/irqdesc.h>
 #include <linux/irqchip/chained_irq.h>
 #include "dpu_kms.h"
-#include <linux/interconnect.h>
 
 #define to_dpu_mdss(x) container_of(x, struct dpu_mdss, base)
 
@@ -315,9 +314,11 @@ int dpu_mdss_init(struct drm_device *dev)
 	}
 	dpu_mdss->mmio_len = resource_size(res);
 
-	ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
-	if (ret)
-		return ret;
+	if (!of_device_is_compatible(dev->dev->of_node, "qcom,sc7180-mdss")) {
+		ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss);
+		if (ret)
+			return ret;
+	}
 
 	mp = &dpu_mdss->mp;
 	ret = msm_dss_parse_clock(pdev, mp);