[RFC PATCH 04/13] drm/msm/disp/dpu1: Add support for DSC

Vinod Koul
2021-05-21T12:51:13Z

Display Stream Compression (DSC) is one of the hw blocks in dpu, so add
support by adding hw blocks for DSC

Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
drivers/gpu/drm/msm/Makefile | 1 +
.../gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 26 +++
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c | 221 ++++++++++++++++++
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h | 79 +++++++
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h | 13 ++
5 files changed, 340 insertions(+)
create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h

diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
index 610d630326bb..fd8fc57f1f58 100644
--- a/drivers/gpu/drm/msm/Makefile
+++ b/drivers/gpu/drm/msm/Makefile
@@ -61,6 +61,7 @@ msm-y := \
disp/dpu1/dpu_hw_blk.o \
disp/dpu1/dpu_hw_catalog.o \
disp/dpu1/dpu_hw_ctl.o \
+ disp/dpu1/dpu_hw_dsc.o \
disp/dpu1/dpu_hw_interrupts.o \
disp/dpu1/dpu_hw_intf.o \
disp/dpu1/dpu_hw_lm.o \
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 4dfd8a20ad5c..a699633f7013 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -165,6 +165,7 @@ enum {
* @DPU_PINGPONG_TE2 Additional tear check block for split pipes
* @DPU_PINGPONG_SPLIT PP block supports split fifo
* @DPU_PINGPONG_SLAVE PP block is a suitable slave for split fifo
+ * @DPU_PINGPONG_DSC Display stream compression blocks
* @DPU_PINGPONG_DITHER, Dither blocks
* @DPU_PINGPONG_MAX
*/
@@ -173,10 +174,21 @@ enum {
DPU_PINGPONG_TE2,
DPU_PINGPONG_SPLIT,
DPU_PINGPONG_SLAVE,
+ DPU_PINGPONG_DSC,
DPU_PINGPONG_DITHER,
DPU_PINGPONG_MAX
};

+/**
+ * DSC sub-blocks
+ * @DPU_DSC DSC sub block
+ * @DPU_DSC_MAX
+ */
+enum {
+ DPU_DSC = 0x1,
+ DPU_DSC_MAX
+};
+
/**
* CTL sub-blocks
* @DPU_CTL_SPLIT_DISPLAY CTL supports video mode split display
@@ -413,6 +425,7 @@ struct dpu_dspp_sub_blks {
struct dpu_pingpong_sub_blks {
struct dpu_pp_blk te;
struct dpu_pp_blk te2;
+ struct dpu_pp_blk dsc;
struct dpu_pp_blk dither;
};

@@ -547,6 +560,16 @@ struct dpu_merge_3d_cfg {
const struct dpu_merge_3d_sub_blks *sblk;
};

+/**
+ * struct dpu_dsc_cfg - information of DSC blocks
+ * @id enum identifying this block
+ * @base register offset of this block
+ * @features bit mask identifying sub-blocks/features
+ */
+struct dpu_dsc_cfg {
+ DPU_HW_BLK_INFO;
+};
+
/**
* struct dpu_intf_cfg - information of timing engine blocks
* @id enum identifying this block
@@ -748,6 +771,9 @@ struct dpu_mdss_cfg {
u32 merge_3d_count;
const struct dpu_merge_3d_cfg *merge_3d;

+ u32 dsc_count;
+ struct dpu_dsc_cfg *dsc;
+
u32 intf_count;
const struct dpu_intf_cfg *intf;

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
new file mode 100644
index 000000000000..8b8d0553709d
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020, Linaro Limited
+ */
+
+#include "dpu_kms.h"
+#include "dpu_hw_catalog.h"
+#include "dpu_hwio.h"
+#include "dpu_hw_mdss.h"
+#include "dpu_hw_dsc.h"
+
+#define DSC_COMMON_MODE 0x000
+#define DSC_ENC 0X004
+#define DSC_PICTURE 0x008
+#define DSC_SLICE 0x00C
+#define DSC_CHUNK_SIZE 0x010
+#define DSC_DELAY 0x014
+#define DSC_SCALE_INITIAL 0x018
+#define DSC_SCALE_DEC_INTERVAL 0x01C
+#define DSC_SCALE_INC_INTERVAL 0x020
+#define DSC_FIRST_LINE_BPG_OFFSET 0x024
+#define DSC_BPG_OFFSET 0x028
+#define DSC_DSC_OFFSET 0x02C
+#define DSC_FLATNESS 0x030
+#define DSC_RC_MODEL_SIZE 0x034
+#define DSC_RC 0x038
+#define DSC_RC_BUF_THRESH 0x03C
+#define DSC_RANGE_MIN_QP 0x074
+#define DSC_RANGE_MAX_QP 0x0B0
+#define DSC_RANGE_BPG_OFFSET 0x0EC
+
+static void dpu_hw_dsc_disable(struct dpu_hw_dsc *dsc)
+{
+ struct dpu_hw_blk_reg_map *c = &dsc->hw;
+
+ DPU_REG_WRITE(c, DSC_COMMON_MODE, 0);
+}
+
+static void dpu_hw_dsc_config(struct dpu_hw_dsc *hw_dsc,
+ struct msm_display_dsc_config *dsc,
+ u32 mode, bool ich_reset_override)
+{
+ struct dpu_hw_blk_reg_map *c = &hw_dsc->hw;
+ u32 data;
+ u32 initial_lines = dsc->initial_lines;
+ bool is_cmd_mode = !(mode & BIT(2));
+
+ DPU_REG_WRITE(c, DSC_COMMON_MODE, mode);
+
+ data = 0;
+ if (ich_reset_override)
+ data = 3 << 28;
+
+ if (is_cmd_mode)
+ initial_lines += 1;
+
+ data |= (initial_lines << 20);
+ data |= ((dsc->slice_last_group_size) << 18);
+ /* bpp is 6.4 format, 4 LSBs bits are for fractional part */
+ data |= dsc->drm.bits_per_pixel << 12;
+ data |= (dsc->drm.block_pred_enable << 7);
+ data |= (dsc->drm.line_buf_depth << 3);
+ data |= (dsc->drm.simple_422 << 2);
+ data |= (dsc->drm.convert_rgb << 1);
+ if (dsc->drm.bits_per_component == 10)
+ data |= BIT(0);
+
+ DPU_REG_WRITE(c, DSC_ENC, data);
+
+ data = dsc->drm.pic_width << 16;
+ data |= dsc->drm.pic_height;
+ DPU_REG_WRITE(c, DSC_PICTURE, data);
+
+ data = dsc->drm.slice_width << 16;
+ data |= dsc->drm.slice_height;
+ DPU_REG_WRITE(c, DSC_SLICE, data);
+
+ data = DIV_ROUND_UP(dsc->drm.slice_width * dsc->drm.bits_per_pixel, 8) << 16;
+
+ DPU_REG_WRITE(c, DSC_CHUNK_SIZE, data);
+
+ data = dsc->drm.initial_dec_delay << 16;
+ data |= dsc->drm.initial_xmit_delay;
+ DPU_REG_WRITE(c, DSC_DELAY, data);
+
+ data = dsc->drm.initial_scale_value;
+ DPU_REG_WRITE(c, DSC_SCALE_INITIAL, data);
+
+ data = dsc->drm.scale_decrement_interval;
+ DPU_REG_WRITE(c, DSC_SCALE_DEC_INTERVAL, data);
+
+ data = 0x00000184; /* only this value works */
+ DPU_REG_WRITE(c, DSC_SCALE_INC_INTERVAL, data);
+
+ data = dsc->drm.first_line_bpg_offset;
+ DPU_REG_WRITE(c, DSC_FIRST_LINE_BPG_OFFSET, data);
+
+ data = dsc->drm.nfl_bpg_offset << 16;
+ data |= dsc->drm.slice_bpg_offset;
+ DPU_REG_WRITE(c, DSC_BPG_OFFSET, data);
+
+ data = dsc->drm.initial_offset << 16;
+ data |= dsc->drm.final_offset;
+ DPU_REG_WRITE(c, DSC_DSC_OFFSET, data);
+
+ data = dsc->det_thresh_flatness << 10;
+ data |= dsc->drm.flatness_max_qp << 5;
+ data |= dsc->drm.flatness_min_qp;
+ DPU_REG_WRITE(c, DSC_FLATNESS, data);
+
+ data = dsc->drm.rc_model_size;
+ DPU_REG_WRITE(c, DSC_RC_MODEL_SIZE, data);
+
+ data = dsc->drm.rc_tgt_offset_low << 18;
+ data |= dsc->drm.rc_tgt_offset_high << 14;
+ data |= dsc->drm.rc_quant_incr_limit1 << 9;
+ data |= dsc->drm.rc_quant_incr_limit0 << 4;
+ data |= dsc->drm.rc_edge_factor;
+ DPU_REG_WRITE(c, DSC_RC, data);
+}
+
+static void dpu_hw_dsc_config_thresh(struct dpu_hw_dsc *hw_dsc,
+ struct msm_display_dsc_config *dsc)
+{
+ struct drm_dsc_rc_range_parameters *rc = dsc->drm.rc_range_params;
+ struct dpu_hw_blk_reg_map *c = &hw_dsc->hw;
+ u32 off = 0x0;
+ u16 *lp;
+ int i;
+
+ lp = dsc->drm.rc_buf_thresh;
+ off = DSC_RC_BUF_THRESH;
+ for (i = 0; i < DSC_NUM_BUF_RANGES - 1 ; i++) {
+ DPU_REG_WRITE(c, off, *lp++);
+ off += 4;
+ }
+
+ off = DSC_RANGE_MIN_QP;
+ for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
+ DPU_REG_WRITE(c, off, rc[i].range_min_qp);
+ off += 4;
+ }
+
+ off = DSC_RANGE_MAX_QP;
+ for (i = 0; i < 15; i++) {
+ DPU_REG_WRITE(c, off, rc[i].range_max_qp);
+ off += 4;
+ }
+
+ off = DSC_RANGE_BPG_OFFSET;
+ for (i = 0; i < 15; i++) {
+ DPU_REG_WRITE(c, off, rc[i].range_bpg_offset);
+ off += 4;
+ }
+}
+
+static struct dpu_dsc_cfg *_dsc_offset(enum dpu_dsc dsc,
+ struct dpu_mdss_cfg *m,
+ void __iomem *addr,
+ struct dpu_hw_blk_reg_map *b)
+{
+ int i;
+
+ for (i = 0; i < m->dsc_count; i++) {
+ if (dsc == m->dsc[i].id) {
+ b->base_off = addr;
+ b->blk_off = m->dsc[i].base;
+ b->length = m->dsc[i].len;
+ b->hwversion = m->hwversion;
+ b->log_mask = DPU_DBG_MASK_DSC;
+ return &m->dsc[i];
+ }
+ }
+
+ return NULL;
+}
+
+static void _setup_dsc_ops(struct dpu_hw_dsc_ops *ops,
+ unsigned long cap)
+{
+ ops->dsc_disable = dpu_hw_dsc_disable;
+ ops->dsc_config = dpu_hw_dsc_config;
+ ops->dsc_config_thresh = dpu_hw_dsc_config_thresh;
+};
+
+static struct dpu_hw_blk_ops dpu_hw_ops = {
+ .start = NULL,
+ .stop = NULL,
+};
+
+struct dpu_hw_dsc *dpu_hw_dsc_init(enum dpu_dsc idx, void __iomem *addr,
+ struct dpu_mdss_cfg *m)
+{
+ struct dpu_hw_dsc *c;
+ struct dpu_dsc_cfg *cfg;
+
+ c = kzalloc(sizeof(*c), GFP_KERNEL);
+ if (!c)
+ return ERR_PTR(-ENOMEM);
+
+ cfg = _dsc_offset(idx, m, addr, &c->hw);
+ if (IS_ERR_OR_NULL(cfg)) {
+ kfree(c);
+ return ERR_PTR(-EINVAL);
+ }
+
+ c->idx = idx;
+ c->caps = cfg;
+ _setup_dsc_ops(&c->ops, c->caps->features);
+
+ dpu_hw_blk_init(&c->base, DPU_HW_BLK_DSC, idx, &dpu_hw_ops);
+
+ return c;
+}
+
+void dpu_hw_dsc_destroy(struct dpu_hw_dsc *dsc)
+{
+ if (dsc)
+ dpu_hw_blk_destroy(&dsc->base);
+ kfree(dsc);
+}
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
new file mode 100644
index 000000000000..c680fd948865
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (c) 2020, Linaro Limited */
+
+#ifndef _DPU_HW_DSC_H
+#define _DPU_HW_DSC_H
+
+#include <drm/drm_dsc.h>
+
+#define DSC_MODE_SPLIT_PANEL BIT(0)
+#define DSC_MODE_MULTIPLEX BIT(1)
+#define DSC_MODE_VIDEO BIT(2)
+
+struct dpu_hw_dsc;
+
+/**
+ * struct dpu_hw_dsc_ops - interface to the dsc hardware driver functions
+ * Assumption is these functions will be called after clocks are enabled
+ */
+struct dpu_hw_dsc_ops {
+ /**
+ * dsc_disable - disable dsc
+ * @hw_dsc: Pointer to dsc context
+ */
+ void (*dsc_disable)(struct dpu_hw_dsc *hw_dsc);
+
+ /**
+ * dsc_config - configures dsc encoder
+ * @hw_dsc: Pointer to dsc context
+ * @dsc: panel dsc parameters
+ * @mode: dsc topology mode to be set
+ * @ich_reset_override: option to reset ich
+ */
+ void (*dsc_config)(struct dpu_hw_dsc *hw_dsc,
+ struct msm_display_dsc_config *dsc,
+ u32 mode, bool ich_reset_override);
+
+ /**
+ * dsc_config_thresh - programs panel thresholds
+ * @hw_dsc: Pointer to dsc context
+ * @dsc: panel dsc parameters
+ */
+ void (*dsc_config_thresh)(struct dpu_hw_dsc *hw_dsc,
+ struct msm_display_dsc_config *dsc);
+};
+
+struct dpu_hw_dsc {
+ struct dpu_hw_blk base;
+ struct dpu_hw_blk_reg_map hw;
+
+ /* dsc */
+ enum dpu_dsc idx;
+ const struct dpu_dsc_cfg *caps;
+
+ /* ops */
+ struct dpu_hw_dsc_ops ops;
+};
+
+/**
+ * dpu_hw_dsc_init - initializes the dsc block for the passed dsc idx.
+ * @idx: DSC index for which driver object is required
+ * @addr: Mapped register io address of MDP
+ * @m: Pointer to mdss catalog data
+ * Returns: Error code or allocated dpu_hw_dsc context
+ */
+struct dpu_hw_dsc *dpu_hw_dsc_init(enum dpu_dsc idx, void __iomem *addr,
+ struct dpu_mdss_cfg *m);
+
+/**
+ * dpu_hw_dsc_destroy - destroys dsc driver context
+ * @dsc: Pointer to dsc driver context returned by dpu_hw_dsc_init
+ */
+void dpu_hw_dsc_destroy(struct dpu_hw_dsc *dsc);
+
+static inline struct dpu_hw_dsc *to_dpu_hw_dsc(struct dpu_hw_blk *hw)
+{
+ return container_of(hw, struct dpu_hw_dsc, base);
+}
+
+#endif /* _DPU_HW_DSC_H */
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
index 09a3fb3e89f5..1b72c11090ee 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
@@ -97,6 +97,7 @@ enum dpu_hw_blk_type {
DPU_HW_BLK_WB,
DPU_HW_BLK_DSPP,
DPU_HW_BLK_MERGE_3D,
+ DPU_HW_BLK_DSC,
DPU_HW_BLK_MAX,
};

@@ -176,6 +177,17 @@ enum dpu_ctl {
CTL_MAX
};

+enum dpu_dsc {
+ DSC_NONE = 0,
+ DSC_0,
+ DSC_1,
+ DSC_2,
+ DSC_3,
+ DSC_4,
+ DSC_5,
+ DSC_MAX
+};
+
enum dpu_pingpong {
PINGPONG_0 = 1,
PINGPONG_1,
@@ -437,5 +449,6 @@ struct dpu_mdss_color {
#define DPU_DBG_MASK_VBIF (1 << 8)
#define DPU_DBG_MASK_ROT (1 << 9)
#define DPU_DBG_MASK_DSPP (1 << 10)
+#define DPU_DBG_MASK_DSC (1 << 11)

#endif /* _DPU_HW_MDSS_H */
--
2.26.3