Re: [PATCH v2 07/16] drm/msm/dpu: add dpu_hw_cdm abstraction for CDM block

From: Dmitry Baryshkov
Date: Fri Dec 08 2023 - 07:07:18 EST

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In reply to: Abhinav Kumar: "[PATCH v2 07/16] drm/msm/dpu: add dpu_hw_cdm abstraction for CDM block"
Next in thread: Abhinav Kumar: "Re: [PATCH v2 07/16] drm/msm/dpu: add dpu_hw_cdm abstraction for CDM block"
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On Fri, 8 Dec 2023 at 07:07, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> wrote:
>
> CDM block comes with its own set of registers and operations
> which can be done. In-line with other hardware sub-blocks, this

I always thought that sub-blocks refer to the dpu_foo_sub_blks data,
which CDM doesn't have.

> change adds the dpu_hw_cdm abstraction for the CDM block.
>
> changes in v2:
> - replace bit magic with relevant defines
> - use drmm_kzalloc instead of kzalloc/free
> - some formatting fixes
> - inline _setup_cdm_ops()
> - protect bind_pingpong_blk with core_rev check
> - drop setup_csc_data() and setup_cdwn() ops as they
> are merged into enable()
>
> Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/Makefile | 1 +
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c | 276 ++++++++++++++++++++
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h | 114 ++++++++
> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h | 1 +
> 4 files changed, 392 insertions(+)
> create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
> create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h
>
> diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
> index 49671364fdcf..b1173128b5b9 100644
> --- a/drivers/gpu/drm/msm/Makefile
> +++ b/drivers/gpu/drm/msm/Makefile
> @@ -63,6 +63,7 @@ msm-$(CONFIG_DRM_MSM_DPU) += \
> disp/dpu1/dpu_encoder_phys_wb.o \
> disp/dpu1/dpu_formats.o \
> disp/dpu1/dpu_hw_catalog.o \
> + disp/dpu1/dpu_hw_cdm.o \
> disp/dpu1/dpu_hw_ctl.o \
> disp/dpu1/dpu_hw_dsc.o \
> disp/dpu1/dpu_hw_dsc_1_2.o \
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
> new file mode 100644
> index 000000000000..0dbe2df56cc8
> --- /dev/null
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.c
> @@ -0,0 +1,276 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2023, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <drm/drm_managed.h>
> +
> +#include "dpu_hw_mdss.h"
> +#include "dpu_hw_util.h"
> +#include "dpu_hw_catalog.h"
> +#include "dpu_hw_cdm.h"
> +#include "dpu_kms.h"
> +
> +#define CDM_CSC_10_OPMODE 0x000
> +#define CDM_CSC_10_BASE 0x004
> +
> +#define CDM_CDWN2_OP_MODE 0x100
> +#define CDM_CDWN2_CLAMP_OUT 0x104
> +#define CDM_CDWN2_PARAMS_3D_0 0x108
> +#define CDM_CDWN2_PARAMS_3D_1 0x10C
> +#define CDM_CDWN2_COEFF_COSITE_H_0 0x110
> +#define CDM_CDWN2_COEFF_COSITE_H_1 0x114
> +#define CDM_CDWN2_COEFF_COSITE_H_2 0x118
> +#define CDM_CDWN2_COEFF_OFFSITE_H_0 0x11C
> +#define CDM_CDWN2_COEFF_OFFSITE_H_1 0x120
> +#define CDM_CDWN2_COEFF_OFFSITE_H_2 0x124
> +#define CDM_CDWN2_COEFF_COSITE_V 0x128
> +#define CDM_CDWN2_COEFF_OFFSITE_V 0x12C
> +#define CDM_CDWN2_OUT_SIZE 0x130
> +
> +#define CDM_HDMI_PACK_OP_MODE 0x200
> +#define CDM_CSC_10_MATRIX_COEFF_0 0x004
> +
> +#define CDM_MUX 0x224
> +
> +/* CDM CDWN2 sub-block bit definitions */
> +#define CDM_CDWN2_OP_MODE_EN BIT(0)
> +#define CDM_CDWN2_OP_MODE_ENABLE_H BIT(1)
> +#define CDM_CDWN2_OP_MODE_ENABLE_V BIT(2)
> +#define CDM_CDWN2_OP_MODE_METHOD_H_AVG BIT(3)
> +#define CDM_CDWN2_OP_MODE_METHOD_H_COSITE BIT(4)
> +#define CDM_CDWN2_OP_MODE_METHOD_V_AVG BIT(5)
> +#define CDM_CDWN2_OP_MODE_METHOD_V_COSITE BIT(6)
> +#define CDM_CDWN2_OP_MODE_BITS_OUT_8BIT BIT(7)
> +#define CDM_CDWN2_OP_MODE_METHOD_H_OFFSITE GENMASK(4, 3)
> +#define CDM_CDWN2_OP_MODE_METHOD_V_OFFSITE GENMASK(6, 5)
> +#define CDM_CDWN2_V_PIXEL_DROP_MASK GENMASK(6, 5)
> +#define CDM_CDWN2_H_PIXEL_DROP_MASK GENMASK(4, 3)
> +
> +/* CDM CSC10 sub-block bit definitions */
> +#define CDM_CSC10_OP_MODE_EN BIT(0)
> +#define CDM_CSC10_OP_MODE_SRC_FMT_YUV BIT(1)
> +#define CDM_CSC10_OP_MODE_DST_FMT_YUV BIT(2)
> +
> +/* CDM HDMI pack sub-block bit definitions */
> +#define CDM_HDMI_PACK_OP_MODE_EN BIT(0)
> +
> +/**
> + * Horizontal coefficients for cosite chroma downscale
> + * s13 representation of coefficients
> + */
> +static u32 cosite_h_coeff[] = {0x00000016, 0x000001cc, 0x0100009e};
> +
> +/**
> + * Horizontal coefficients for offsite chroma downscale
> + */
> +static u32 offsite_h_coeff[] = {0x000b0005, 0x01db01eb, 0x00e40046};
> +
> +/**
> + * Vertical coefficients for cosite chroma downscale
> + */
> +static u32 cosite_v_coeff[] = {0x00080004};
> +/**
> + * Vertical coefficients for offsite chroma downscale
> + */
> +static u32 offsite_v_coeff[] = {0x00060002};
> +
> +static int dpu_hw_cdm_setup_cdwn(struct dpu_hw_cdm *ctx, struct dpu_hw_cdm_cfg *cfg)
> +{
> + struct dpu_hw_blk_reg_map *c = &ctx->hw;
> + u32 opmode = 0;
> + u32 out_size = 0;
> +
> + if (cfg->output_bit_depth == CDM_CDWN_OUTPUT_10BIT)
> + opmode &= ~CDM_CDWN2_OP_MODE_BITS_OUT_8BIT;

We start from opmode = 0. Does it really make sense to mask bits from
the zero opmode?

> + else
> + opmode |= CDM_CDWN2_OP_MODE_BITS_OUT_8BIT;
> +
> + /* ENABLE DWNS_H bit */
> + opmode |= CDM_CDWN2_OP_MODE_ENABLE_H;
> +
> + switch (cfg->h_cdwn_type) {
> + case CDM_CDWN_DISABLE:
> + /* CLEAR METHOD_H field */
> + opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> + /* CLEAR DWNS_H bit */
> + opmode &= ~CDM_CDWN2_OP_MODE_ENABLE_H;
> + break;
> + case CDM_CDWN_PIXEL_DROP:
> + /* Clear METHOD_H field (pixel drop is 0) */
> + opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> + break;
> + case CDM_CDWN_AVG:
> + /* Clear METHOD_H field (Average is 0x1) */
> + opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> + opmode |= CDM_CDWN2_OP_MODE_METHOD_H_AVG;
> + break;
> + case CDM_CDWN_COSITE:
> + /* Clear METHOD_H field (Average is 0x2) */
> + opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> + opmode |= CDM_CDWN2_OP_MODE_METHOD_H_COSITE;
> + /* Co-site horizontal coefficients */
> + DPU_REG_WRITE(c, CDM_CDWN2_COEFF_COSITE_H_0,
> + cosite_h_coeff[0]);
> + DPU_REG_WRITE(c, CDM_CDWN2_COEFF_COSITE_H_1,
> + cosite_h_coeff[1]);
> + DPU_REG_WRITE(c, CDM_CDWN2_COEFF_COSITE_H_2,
> + cosite_h_coeff[2]);
> + break;
> + case CDM_CDWN_OFFSITE:
> + /* Clear METHOD_H field (Average is 0x3) */
> + opmode &= ~CDM_CDWN2_H_PIXEL_DROP_MASK;
> + opmode |= CDM_CDWN2_OP_MODE_METHOD_H_OFFSITE;
> +
> + /* Off-site horizontal coefficients */
> + DPU_REG_WRITE(c, CDM_CDWN2_COEFF_OFFSITE_H_0,
> + offsite_h_coeff[0]);
> + DPU_REG_WRITE(c, CDM_CDWN2_COEFF_OFFSITE_H_1,
> + offsite_h_coeff[1]);
> + DPU_REG_WRITE(c, CDM_CDWN2_COEFF_OFFSITE_H_2,
> + offsite_h_coeff[2]);
> + break;
> + default:
> + pr_err("%s invalid horz down sampling type\n", __func__);

DPU_ERROR or drm_err

> + return -EINVAL;
> + }
> +
> + /* ENABLE DWNS_V bit */
> + opmode |= CDM_CDWN2_OP_MODE_ENABLE_V;
> +
> + switch (cfg->v_cdwn_type) {
> + case CDM_CDWN_DISABLE:
> + /* CLEAR METHOD_V field */
> + opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> + /* CLEAR DWNS_V bit */
> + opmode &= ~CDM_CDWN2_OP_MODE_ENABLE_V;
> + break;
> + case CDM_CDWN_PIXEL_DROP:
> + /* Clear METHOD_V field (pixel drop is 0) */
> + opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> + break;
> + case CDM_CDWN_AVG:
> + /* Clear METHOD_V field (Average is 0x1) */
> + opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> + opmode |= CDM_CDWN2_OP_MODE_METHOD_V_AVG;
> + break;
> + case CDM_CDWN_COSITE:
> + /* Clear METHOD_V field (Average is 0x2) */
> + opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> + opmode |= CDM_CDWN2_OP_MODE_METHOD_V_COSITE;
> + /* Co-site vertical coefficients */
> + DPU_REG_WRITE(c,
> + CDM_CDWN2_COEFF_COSITE_V,
> + cosite_v_coeff[0]);
> + break;
> + case CDM_CDWN_OFFSITE:
> + /* Clear METHOD_V field (Average is 0x3) */
> + opmode &= ~CDM_CDWN2_V_PIXEL_DROP_MASK;
> + opmode |= CDM_CDWN2_OP_MODE_METHOD_V_OFFSITE;
> +
> + /* Off-site vertical coefficients */
> + DPU_REG_WRITE(c,
> + CDM_CDWN2_COEFF_OFFSITE_V,
> + offsite_v_coeff[0]);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + if (cfg->v_cdwn_type || cfg->h_cdwn_type)
> + opmode |= CDM_CDWN2_OP_MODE_EN; /* EN CDWN module */
> + else
> + opmode &= ~CDM_CDWN2_OP_MODE_EN;
> +
> + out_size = (cfg->output_width & 0xFFFF) | ((cfg->output_height & 0xFFFF) << 16);
> + DPU_REG_WRITE(c, CDM_CDWN2_OUT_SIZE, out_size);
> + DPU_REG_WRITE(c, CDM_CDWN2_OP_MODE, opmode);
> + DPU_REG_WRITE(c, CDM_CDWN2_CLAMP_OUT, ((0x3FF << 16) | 0x0));
> +
> + return 0;
> +}
> +
> +int dpu_hw_cdm_enable(struct dpu_hw_cdm *ctx, struct dpu_hw_cdm_cfg *cdm)
> +{
> + struct dpu_hw_blk_reg_map *c = &ctx->hw;
> + const struct dpu_format *fmt;
> + u32 opmode = 0;
> + u32 csc = 0;
> +
> + if (!ctx || !cdm)
> + return -EINVAL;
> +
> + fmt = cdm->output_fmt;
> +
> + if (!DPU_FORMAT_IS_YUV(fmt))
> + return -EINVAL;
> +
> + dpu_hw_csc_setup(&ctx->hw, CDM_CSC_10_MATRIX_COEFF_0, cdm->csc_cfg, true);
> + dpu_hw_cdm_setup_cdwn(ctx, cdm);
> +
> + if (cdm->output_type == CDM_CDWN_OUTPUT_HDMI) {
> + if (fmt->chroma_sample != DPU_CHROMA_H1V2)
> + return -EINVAL; /*unsupported format */
> + opmode = CDM_HDMI_PACK_OP_MODE_EN;
> + opmode |= (fmt->chroma_sample << 1);
> + }
> +
> + csc |= CDM_CSC10_OP_MODE_DST_FMT_YUV;
> + csc &= ~CDM_CSC10_OP_MODE_SRC_FMT_YUV;
> + csc |= CDM_CSC10_OP_MODE_EN;
> +
> + if (ctx && ctx->ops.bind_pingpong_blk)
> + ctx->ops.bind_pingpong_blk(ctx, true, cdm->pp_id);
> +
> + DPU_REG_WRITE(c, CDM_CSC_10_OPMODE, csc);
> + DPU_REG_WRITE(c, CDM_HDMI_PACK_OP_MODE, opmode);
> + return 0;
> +}
> +
> +void dpu_hw_cdm_disable(struct dpu_hw_cdm *ctx)
> +{
> + if (!ctx)
> + return;
> +
> + if (ctx && ctx->ops.bind_pingpong_blk)
> + ctx->ops.bind_pingpong_blk(ctx, false, PINGPONG_NONE);

So the bind/un_pingpong_block gets hidden here. Why do we need to
unbind it manually in the dpu_encoder then?

> +}
> +
> +static void dpu_hw_cdm_bind_pingpong_blk(struct dpu_hw_cdm *ctx, bool enable,
> + const enum dpu_pingpong pp)

I think we settled on the PINGPONG_NONE for removing the binding

> +{
> + struct dpu_hw_blk_reg_map *c;
> + int mux_cfg = 0xF;
> +
> + c = &ctx->hw;
> +
> + if (enable)
> + mux_cfg = (pp - PINGPONG_0) & 0x7;
> +
> + DPU_REG_WRITE(c, CDM_MUX, mux_cfg);
> +}
> +
> +struct dpu_hw_cdm *dpu_hw_cdm_init(struct drm_device *dev,
> + const struct dpu_cdm_cfg *cfg, void __iomem *addr,
> + const struct dpu_mdss_version *mdss_rev)
> +{
> + struct dpu_hw_cdm *c;
> +
> + c = drmm_kzalloc(dev, sizeof(*c), GFP_KERNEL);
> + if (!c)
> + return ERR_PTR(-ENOMEM);
> +
> + c->hw.blk_addr = addr + cfg->base;
> + c->hw.log_mask = DPU_DBG_MASK_CDM;
> +
> + /* Assign ops */
> + c->idx = cfg->id;
> + c->caps = cfg;
> +
> + c->ops.enable = dpu_hw_cdm_enable;
> + c->ops.disable = dpu_hw_cdm_disable;
> + if (mdss_rev->core_major_ver >= 5)
> + c->ops.bind_pingpong_blk = dpu_hw_cdm_bind_pingpong_blk;
> +
> + return c;
> +}
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h
> new file mode 100644
> index 000000000000..1ca806f9d18d
> --- /dev/null
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_cdm.h
> @@ -0,0 +1,114 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2023, The Linux Foundation. All rights reserved.
> + */
> +
> +#ifndef _DPU_HW_CDM_H
> +#define _DPU_HW_CDM_H
> +
> +#include "dpu_hw_mdss.h"
> +#include "dpu_hw_top.h"
> +
> +struct dpu_hw_cdm;
> +
> +struct dpu_hw_cdm_cfg {
> + u32 output_width;
> + u32 output_height;
> + u32 output_bit_depth;
> + u32 h_cdwn_type;
> + u32 v_cdwn_type;
> + const struct dpu_format *output_fmt;
> + const struct dpu_csc_cfg *csc_cfg;
> + u32 output_type;
> + int pp_id;
> +};
> +
> +enum dpu_hw_cdwn_type {
> + CDM_CDWN_DISABLE,
> + CDM_CDWN_PIXEL_DROP,
> + CDM_CDWN_AVG,
> + CDM_CDWN_COSITE,
> + CDM_CDWN_OFFSITE,
> +};
> +
> +enum dpu_hw_cdwn_output_type {
> + CDM_CDWN_OUTPUT_HDMI,
> + CDM_CDWN_OUTPUT_WB,
> +};
> +
> +enum dpu_hw_cdwn_output_bit_depth {
> + CDM_CDWN_OUTPUT_8BIT,
> + CDM_CDWN_OUTPUT_10BIT,
> +};

Can we please get some documentation for these enums?

> +
> +/**
> + * struct dpu_hw_cdm_ops : Interface to the chroma down Hw driver functions
> + * Assumption is these functions will be called after
> + * clocks are enabled
> + * @enable: Enables the output to interface and programs the
> + * output packer
> + * @disable: Puts the cdm in bypass mode
> + * @bind_pingpong_blk: enable/disable the connection with pingpong which
> + * will feed pixels to this cdm
> + */
> +struct dpu_hw_cdm_ops {
> + /**
> + * Enable the CDM module
> + * @cdm Pointer to chroma down context
> + */
> + int (*enable)(struct dpu_hw_cdm *cdm, struct dpu_hw_cdm_cfg *cfg);
> +
> + /**
> + * Disable the CDM module
> + * @cdm Pointer to chroma down context
> + */
> + void (*disable)(struct dpu_hw_cdm *cdm);
> +
> + /**
> + * Enable/disable the connection with pingpong
> + * @cdm Pointer to chroma down context
> + * @enable Enable/disable control
> + * @pp pingpong block id.
> + */
> + void (*bind_pingpong_blk)(struct dpu_hw_cdm *cdm, bool enable,
> + const enum dpu_pingpong pp);
> +};
> +
> +/**
> + * struct dpu_hw_cdm - cdm description
> + * @base: Hardware block base structure
> + * @hw: Block hardware details
> + * @idx: CDM index
> + * @caps: Pointer to cdm_cfg
> + * @ops: handle to operations possible for this CDM
> + */
> +struct dpu_hw_cdm {
> + struct dpu_hw_blk base;
> + struct dpu_hw_blk_reg_map hw;
> +
> + /* chroma down */
> + const struct dpu_cdm_cfg *caps;
> + enum dpu_cdm idx;
> +
> + /* ops */
> + struct dpu_hw_cdm_ops ops;
> +};
> +
> +/**
> + * dpu_hw_cdm_init - initializes the cdm hw driver object.
> + * should be called once before accessing every cdm.
> + * @dev: DRM device handle
> + * @cdm: CDM catalog entry for which driver object is required
> + * @addr : mapped register io address of MDSS
> + * @mdss_rev: mdss hw core revision
> + */
> +struct dpu_hw_cdm *dpu_hw_cdm_init(struct drm_device *dev,
> + const struct dpu_cdm_cfg *cdm, void __iomem *addr,
> + const struct dpu_mdss_version *mdss_rev);
> +
> +static inline struct dpu_hw_cdm *to_dpu_hw_cdm(struct dpu_hw_blk *hw)
> +{
> + return container_of(hw, struct dpu_hw_cdm, base);
> +}
> +
> +#endif /*_DPU_HW_CDM_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 f319c8232ea5..9db4cf61bd29 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
> @@ -466,6 +466,7 @@ struct dpu_mdss_color {
> #define DPU_DBG_MASK_ROT (1 << 9)
> #define DPU_DBG_MASK_DSPP (1 << 10)
> #define DPU_DBG_MASK_DSC (1 << 11)
> +#define DPU_DBG_MASK_CDM (1 << 12)
>
> /**
> * struct dpu_hw_tear_check - Struct contains parameters to configure
> --
> 2.40.1
>

--
With best wishes

Dmitry

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