[v2 1/3] drm/msm/dpu: add support for clk and bw scaling for display

From: Krishna Manikandan
Date: Thu Apr 02 2020 - 02:53:19 EST

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.
---
drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 106 +++++++++++++++++++++----
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 5 +-
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 4 +
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 37 ++++++++-
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 4 +
drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 9 ++-
drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 82 +++++++++++++++++++
drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h | 4 +
8 files changed, 228 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
index 11f2beb..24874f6 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c
+++ b/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;
@@ -67,12 +134,7 @@ 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;
@@ -80,6 +142,10 @@ static void _dpu_core_perf_calc_crtc(struct dpu_kms *kms,
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;
}

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
index c567917..9c6b10a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
@@ -519,7 +519,8 @@
.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),
@@ -536,6 +537,8 @@
{.rd_enable = 1, .wr_enable = 1},
{.rd_enable = 1, .wr_enable = 0}
},
+ .clk_inefficiency_factor = 105,
+ .bw_inefficiency_factor = 120,
};

/*************************************************************
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index 09df7d8..b47e0e6 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -616,6 +616,8 @@ 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
@@ -640,6 +642,8 @@ 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];
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index cb08faf..3c3a838 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -228,6 +228,28 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor)
}
#endif

+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);
@@ -910,6 +932,9 @@ 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;
@@ -1015,7 +1040,7 @@ 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 drm_device *ddev;
@@ -1026,6 +1051,9 @@ 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;
}

@@ -1037,8 +1065,15 @@ 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);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index c6169e7..fc1d303 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/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"
@@ -130,6 +132,8 @@ struct dpu_kms {
* when disabled.
*/
atomic_t bandwidth_ref;
+ struct icc_path *path[2];
+ u32 num_paths;
};

struct vsync_info {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
index 80d3cfc..df0a983 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
+++ b/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);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
index 3b9c33e..c2a6e3d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
@@ -132,6 +132,84 @@ static struct dpu_kms *_dpu_plane_get_kms(struct drm_plane *plane)
}

/**
+ * _dpu_plane_calc_bw - calculate bandwidth required for a plane
+ * @Plane: Pointer to drm plane.
+ * Result: Updates calculated bandwidth in the plane state.
+ * BW Equation: src_w * src_h * bpp * fps * (v_total / v_dest)
+ * Prefill BW Equation: line src bytes * line_time
+ */
+static void _dpu_plane_calc_bw(struct drm_plane *plane,
+ struct drm_framebuffer *fb)
+{
+ struct dpu_plane *pdpu = to_dpu_plane(plane);
+ struct dpu_plane_state *pstate;
+ struct drm_display_mode *mode;
+ const struct dpu_format *fmt = NULL;
+ struct dpu_kms *dpu_kms = _dpu_plane_get_kms(plane);
+ int src_width, src_height, dst_height, fps;
+ u64 plane_prefill_bw;
+ u64 plane_bw;
+ u32 hw_latency_lines;
+ u32 scale_factor;
+ int vbp, vpw;
+
+ pstate = to_dpu_plane_state(plane->state);
+ mode = &plane->state->crtc->mode;
+
+ fmt = dpu_get_dpu_format_ext(fb->format->format, fb->modifier);
+
+ src_width = drm_rect_width(&pdpu->pipe_cfg.src_rect);
+ src_height = drm_rect_height(&pdpu->pipe_cfg.src_rect);
+ dst_height = drm_rect_height(&pdpu->pipe_cfg.dst_rect);
+ fps = drm_mode_vrefresh(mode);
+ vbp = mode->vtotal - mode->vsync_end;
+ vpw = mode->vsync_end - mode->vsync_start;
+ hw_latency_lines = dpu_kms->catalog->perf.min_prefill_lines;
+ scale_factor = src_height > dst_height ?
+ mult_frac(src_height, 1, dst_height) : 1;
+
+ plane_bw =
+ src_width * mode->vtotal * fps * fmt->bpp * scale_factor;
+
+ plane_prefill_bw =
+ src_width * hw_latency_lines * fps * fmt->bpp * scale_factor;
+
+ plane_prefill_bw = mult_frac(plane_prefill_bw, mode->vtotal, (vbp+vpw));
+
+ pstate->plane_fetch_bw = max(plane_bw, plane_prefill_bw);
+}
+
+
+/**
+ * _dpu_plane_calc_clk - calculate clock required for a plane
+ * @Plane: Pointer to drm plane.
+ * Result: Updates calculated clock in the plane state.
+ * Clock equation: dst_w * v_total * fps * (src_h / dst_h)
+ */
+static void _dpu_plane_calc_clk(struct drm_plane *plane)
+{
+ struct dpu_plane *pdpu = to_dpu_plane(plane);
+ struct dpu_plane_state *pstate;
+ struct drm_display_mode *mode;
+ int dst_width, src_height, dst_height, fps;
+
+ pstate = to_dpu_plane_state(plane->state);
+ mode = &plane->state->crtc->mode;
+
+ src_height = drm_rect_height(&pdpu->pipe_cfg.src_rect);
+ dst_width = drm_rect_width(&pdpu->pipe_cfg.dst_rect);
+ dst_height = drm_rect_height(&pdpu->pipe_cfg.dst_rect);
+ fps = drm_mode_vrefresh(mode);
+
+ pstate->plane_clk =
+ dst_width * mode->vtotal * fps;
+
+ if (src_height > dst_height)
+ pstate->plane_clk = mult_frac(pstate->plane_clk,
+ src_height, dst_height);
+}
+
+/**
* _dpu_plane_calc_fill_level - calculate fill level of the given source format
* @plane: Pointer to drm plane
* @fmt: Pointer to source buffer format
@@ -1102,6 +1180,10 @@ static void dpu_plane_sspp_atomic_update(struct drm_plane *plane)
}

_dpu_plane_set_qos_remap(plane);
+
+ _dpu_plane_calc_bw(plane, fb);
+
+ _dpu_plane_calc_clk(plane);
}

static void _dpu_plane_atomic_disable(struct drm_plane *plane)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
index 4569497..ca83b87 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.h
@@ -25,6 +25,8 @@
* @scaler3_cfg: configuration data for scaler3
* @pixel_ext: configuration data for pixel extensions
* @cdp_cfg: CDP configuration
+ * @plane_fetch_bw: calculated BW per plane
+ * @plane_clk: calculated clk per plane
*/
struct dpu_plane_state {
struct drm_plane_state base;
@@ -39,6 +41,8 @@ struct dpu_plane_state {
struct dpu_hw_pixel_ext pixel_ext;

struct dpu_hw_pipe_cdp_cfg cdp_cfg;
+ u64 plane_fetch_bw;
+ u64 plane_clk;
};

/**
--
1.9.1