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Message-ID: <f183bed1-76d4-abb2-49d0-f40da65fcf75@linaro.org>
Date: Mon, 1 May 2023 23:50:53 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Kuogee Hsieh <quic_khsieh@...cinc.com>,
dri-devel@...ts.freedesktop.org, robdclark@...il.com,
sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
vkoul@...nel.org, daniel@...ll.ch, airlied@...il.com,
agross@...nel.org, andersson@...nel.org
Cc: quic_abhinavk@...cinc.com, quic_sbillaka@...cinc.com,
marijn.suijten@...ainline.org, freedreno@...ts.freedesktop.org,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] drm/msm/dpu: add support for DSC encoder v1.2
engine
On 01/05/2023 23:40, Kuogee Hsieh wrote:
>
> On 4/28/2023 5:30 PM, Dmitry Baryshkov wrote:
>> On 29/04/2023 02:45, Kuogee Hsieh wrote:
>>> Add support for DSC 1.2 by providing the necessary hooks to program
>>> the DPU DSC 1.2 encoder.
>>>
>>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> What exactly was reported?
>>
>>> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
>>> ---
>>> drivers/gpu/drm/msm/Makefile | 1 +
>>> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 34 ++-
>>> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h | 14 +-
>>> drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc_1_2.c | 335
>>> +++++++++++++++++++++++++
>>> drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 7 +-
>>> 5 files changed, 387 insertions(+), 4 deletions(-)
>>> create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc_1_2.c
>>>
>>> diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
>>> index b814fc8..b9af5e4 100644
>>> --- a/drivers/gpu/drm/msm/Makefile
>>> +++ b/drivers/gpu/drm/msm/Makefile
>>> @@ -65,6 +65,7 @@ msm-$(CONFIG_DRM_MSM_DPU) += \
>>> disp/dpu1/dpu_hw_catalog.o \
>>> disp/dpu1/dpu_hw_ctl.o \
>>> disp/dpu1/dpu_hw_dsc.o \
>>> + disp/dpu1/dpu_hw_dsc_1_2.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 71584cd..fc87db1 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>>> @@ -1,6 +1,6 @@
>>> /* SPDX-License-Identifier: GPL-2.0-only */
>>> /*
>>> - * Copyright (c) 2022. Qualcomm Innovation Center, Inc. All rights
>>> reserved.
>>> + * Copyright (c) 2022-2023, Qualcomm Innovation Center, Inc. All
>>> rights reserved.
>>> * Copyright (c) 2015-2018, 2020 The Linux Foundation. All rights
>>> reserved.
>>> */
>>> @@ -241,12 +241,20 @@ enum {
>>> };
>>> /**
>>> - * DSC features
>>> + * DSC sub-blocks/features
>>> * @DPU_DSC_OUTPUT_CTRL Configure which PINGPONG block gets
>>> * the pixel output from this DSC.
>>> + * @DPU_DSC_HW_REV_1_1 DSC block supports dsc 1.1 only
>>> + * @DPU_DSC_HW_REV_1_2 DSC block supports dsc 1.1 and 1.2
>>> + * @DPU_DSC_NATIVE_422_EN Supports native422 and native420 encoding
>>> + * @DPU_DSC_MAX
>>> */
>>> enum {
>>> DPU_DSC_OUTPUT_CTRL = 0x1,
>>> + DPU_DSC_HW_REV_1_1,
>>> + DPU_DSC_HW_REV_1_2,
>>> + DPU_DSC_NATIVE_422_EN,
>>> + DPU_DSC_MAX
>>> };
>>> /**
>>> @@ -311,6 +319,14 @@ struct dpu_pp_blk {
>>> };
>>> /**
>>> + * struct dpu_dsc_blk - DSC Encoder sub-blk information
>>> + * @info: HW register and features supported by this sub-blk
>>> + */
>>> +struct dpu_dsc_blk {
>>> + DPU_HW_SUBBLK_INFO;
>>> +};
>>> +
>>> +/**
>>> * enum dpu_qos_lut_usage - define QoS LUT use cases
>>> */
>>> enum dpu_qos_lut_usage {
>>> @@ -459,6 +475,17 @@ struct dpu_pingpong_sub_blks {
>>> };
>>> /**
>>> + * struct dpu_dsc_sub_blks - DSC sub-blks
>>> + * @enc: DSC encoder sub block
>>> + * @ctl: DSC controller sub block
>>> + *
>>> + */
>>> +struct dpu_dsc_sub_blks {
>>> + struct dpu_dsc_blk enc;
>>> + struct dpu_dsc_blk ctl;
>>> +};
>>> +
>>> +/**
>>> * dpu_clk_ctrl_type - Defines top level clock control signals
>>> */
>>> enum dpu_clk_ctrl_type {
>>> @@ -612,10 +639,13 @@ struct dpu_merge_3d_cfg {
>>> * struct dpu_dsc_cfg - information of DSC blocks
>>> * @id enum identifying this block
>>> * @base register offset of this block
>>> + * @len: length of hardware block
>>> * @features bit mask identifying sub-blocks/features
>>> + * @sblk sub-blocks information
>>> */
>>> struct dpu_dsc_cfg {
>>> DPU_HW_BLK_INFO;
>>> + const struct dpu_dsc_sub_blks *sblk;
>>> };
>>> /**
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
>>> index 287ec5f..e11240a 100644
>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc.h
>>> @@ -1,5 +1,8 @@
>>> /* SPDX-License-Identifier: GPL-2.0-only */
>>> -/* Copyright (c) 2020-2022, Linaro Limited */
>>> +/*
>>> + * Copyright (c) 2020-2022, Linaro Limited
>>> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights
>>> reserved
>>> + */
>>> #ifndef _DPU_HW_DSC_H
>>> #define _DPU_HW_DSC_H
>>> @@ -70,6 +73,15 @@ struct dpu_hw_dsc *dpu_hw_dsc_init(const struct
>>> dpu_dsc_cfg *cfg,
>>> void __iomem *addr);
>>> /**
>>> + * dpu_hw_dsc_init_1_2 - initializes the v1.2 DSC hw driver block
>>> + * @cfg: DSC catalog entry for which driver object is required
>>> + * @addr: Mapped register io address of MDP
>>> + * Returns: Error code or allocated dpu_hw_dsc context
>>> + */
>>> +struct dpu_hw_dsc *dpu_hw_dsc_init_1_2(const struct dpu_dsc_cfg *cfg,
>>> + void __iomem *addr);
>>> +
>>> +/**
>>> * dpu_hw_dsc_destroy - destroys dsc driver context
>>> * @dsc: Pointer to dsc driver context returned by dpu_hw_dsc_init
>>> */
>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc_1_2.c
>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc_1_2.c
>>> new file mode 100644
>>> index 00000000..a777c7b
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_dsc_1_2.c
>>> @@ -0,0 +1,335 @@
>>> +// SPDX-License-Identifier: GPL-2.0-only
>>> +/*
>>> + * Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
>>> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights
>>> reserved
>>> + */
>>> +
>>> +#include <drm/display/drm_dsc_helper.h>
>>> +
>>> +#include "dpu_kms.h"
>>> +#include "dpu_hw_catalog.h"
>>> +#include "dpu_hwio.h"
>>> +#include "dpu_hw_mdss.h"
>>> +#include "dpu_hw_dsc.h"
>>> +
>>> +
>>
>> Unused empty line
>>
>>> +#define DSC_CMN_MAIN_CNF 0x00
>>> +
>>> +/* DPU_DSC_ENC register offsets */
>>> +#define ENC_DF_CTRL 0x00
>>> +#define ENC_GENERAL_STATUS 0x04
>>> +#define ENC_HSLICE_STATUS 0x08
>>> +#define ENC_OUT_STATUS 0x0C
>>> +#define ENC_INT_STAT 0x10
>>> +#define ENC_INT_CLR 0x14
>>> +#define ENC_INT_MASK 0x18
>>> +#define DSC_MAIN_CONF 0x30
>>> +#define DSC_PICTURE_SIZE 0x34
>>> +#define DSC_SLICE_SIZE 0x38
>>> +#define DSC_MISC_SIZE 0x3C
>>> +#define DSC_HRD_DELAYS 0x40
>>> +#define DSC_RC_SCALE 0x44
>>> +#define DSC_RC_SCALE_INC_DEC 0x48
>>> +#define DSC_RC_OFFSETS_1 0x4C
>>> +#define DSC_RC_OFFSETS_2 0x50
>>> +#define DSC_RC_OFFSETS_3 0x54
>>> +#define DSC_RC_OFFSETS_4 0x58
>>> +#define DSC_FLATNESS_QP 0x5C
>>> +#define DSC_RC_MODEL_SIZE 0x60
>>> +#define DSC_RC_CONFIG 0x64
>>> +#define DSC_RC_BUF_THRESH_0 0x68
>>> +#define DSC_RC_MIN_QP_0 0x78
>>> +#define DSC_RC_MAX_QP_0 0x84
>>> +#define DSC_RC_RANGE_BPG_OFFSETS_0 0x90
>>> +
>>> +/* DPU_DSC_CTL register offsets */
>>> +#define DSC_CTL 0x00
>>> +#define DSC_CFG 0x04
>>> +#define DSC_DATA_IN_SWAP 0x08
>>> +#define DSC_CLK_CTRL 0x0C
>>> +
>>> +static inline int _dsc_calc_ob_max_addr(struct dpu_hw_dsc *hw_dsc,
>>> int num_ss, bool native_422)
>>> +{
>>> + int max_addr = 2400 / num_ss;
>>> +
>>> + if ((hw_dsc->caps->features & BIT(DPU_DSC_NATIVE_422_EN)) &&
>>> native_422)
>>> + max_addr /= 2;
>>> +
>>> + return max_addr - 1;
>>> +};
>>> +
>>> +static void dpu_hw_dsc_disable_1_2(struct dpu_hw_dsc *hw_dsc)
>>> +{
>>> + struct dpu_hw_blk_reg_map *hw;
>>> + u32 offset;
>>> +
>>> + if (!hw_dsc)
>>> + return;
>>> +
>>> + hw = &hw_dsc->hw;
>>> + offset = hw_dsc->caps->sblk->ctl.base;
>>> + DPU_REG_WRITE(hw, offset + DSC_CFG, 0);
>>> +
>>> + offset = hw_dsc->caps->sblk->enc.base;
>>> + DPU_REG_WRITE(hw, offset + ENC_DF_CTRL, 0);
>>> + DPU_REG_WRITE(hw, offset + DSC_MAIN_CONF, 0);
>>> +}
>>> +
>>> +static void dpu_hw_dsc_config_1_2(struct dpu_hw_dsc *hw_dsc,
>>> + struct drm_dsc_config *dsc,
>>> + u32 mode,
>>> + u32 initial_lines)
>>> +{
>>> + struct dpu_hw_blk_reg_map *hw;
>>> + u32 offset;
>>> + u32 data = 0;
>>> + u32 det_thresh_flatness;
>>> + u32 num_active_ss_per_enc;
>>> + u32 bpp;
>>> +
>>> + if (!hw_dsc || !dsc)
>>> + return;
>>> +
>>> + hw = &hw_dsc->hw;
>>> +
>>> + offset = hw_dsc->caps->sblk->enc.base;
>>> +
>>> + if (mode & DSC_MODE_SPLIT_PANEL)
>>> + data |= BIT(0);
>>> +
>>> + if (mode & DSC_MODE_MULTIPLEX)
>>> + data |= BIT(1);
>>> +
>>> + num_active_ss_per_enc = dsc->slice_count;
>>> + if (mode & DSC_MODE_MULTIPLEX)
>>> + num_active_ss_per_enc = dsc->slice_count >> 1;
>>> +
>>> + data |= (num_active_ss_per_enc & 0x3) << 7;
>>> +
>>> + DPU_REG_WRITE(hw, DSC_CMN_MAIN_CNF, data);
>>> +
>>> + data = (initial_lines & 0xff);
>>> +
>>> + if (mode & DSC_MODE_VIDEO)
>>> + data |= BIT(9);
>>> +
>>> + data |= (_dsc_calc_ob_max_addr(hw_dsc, num_active_ss_per_enc,
>>> dsc->native_422) << 18);
>>> +
>>> + DPU_REG_WRITE(hw, offset + ENC_DF_CTRL, data);
>>> +
>>> + data = (dsc->dsc_version_minor & 0xf) << 28;
>>> + if (dsc->dsc_version_minor == 0x2) {
>>> + if (dsc->native_422)
>>> + data |= BIT(22);
>>> + if (dsc->native_420)
>>> + data |= BIT(21);
>>> + }
>>> +
>>> + bpp = dsc->bits_per_pixel;
>>> + /* as per hw requirement bpp should be programmed
>>> + * twice the actual value in case of 420 or 422 encoding
>>> + */
>>> + if (dsc->native_422 || dsc->native_420)
>>> + bpp = 2 * bpp;
>>> + data |= (dsc->block_pred_enable ? 1 : 0) << 20;
>>> + data |= bpp << 10;
>>> + data |= (dsc->line_buf_depth & 0xf) << 6;
>>> + data |= dsc->convert_rgb << 4;
>>> + data |= dsc->bits_per_component & 0xf;
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_MAIN_CONF, data);
>>> +
>>> + data = (dsc->pic_width & 0xffff) |
>>> + ((dsc->pic_height & 0xffff) << 16);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_PICTURE_SIZE, data);
>>> +
>>> + data = (dsc->slice_width & 0xffff) |
>>> + ((dsc->slice_height & 0xffff) << 16);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_SLICE_SIZE, data);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_MISC_SIZE,
>>> + (dsc->slice_chunk_size) & 0xffff);
>>> +
>>> + data = (dsc->initial_xmit_delay & 0xffff) |
>>> + ((dsc->initial_dec_delay & 0xffff) << 16);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_HRD_DELAYS, data);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_SCALE,
>>> + dsc->initial_scale_value & 0x3f);
>>> +
>>> + data = (dsc->scale_increment_interval & 0xffff) |
>>> + ((dsc->scale_decrement_interval & 0x7ff) << 16);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_SCALE_INC_DEC, data);
>>> +
>>> + data = (dsc->first_line_bpg_offset & 0x1f) |
>>> + ((dsc->second_line_bpg_offset & 0x1f) << 5);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_OFFSETS_1, data);
>>> +
>>> + data = (dsc->nfl_bpg_offset & 0xffff) |
>>> + ((dsc->slice_bpg_offset & 0xffff) << 16);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_OFFSETS_2, data);
>>> +
>>> + data = (dsc->initial_offset & 0xffff) |
>>> + ((dsc->final_offset & 0xffff) << 16);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_OFFSETS_3, data);
>>> +
>>> + data = (dsc->nsl_bpg_offset & 0xffff) |
>>> + ((dsc->second_line_offset_adj & 0xffff) << 16);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_OFFSETS_4, data);
>>> +
>>> + data = (dsc->flatness_min_qp & 0x1f);
>>> + data |= (dsc->flatness_max_qp & 0x1f) << 5;
>>> +
>>> + det_thresh_flatness = drm_dsc_calculate_flatness_det_thresh(dsc);
>>> + data |= (det_thresh_flatness & 0xff) << 10;
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_FLATNESS_QP, data);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_MODEL_SIZE,
>>> + (dsc->rc_model_size) & 0xffff);
>>> +
>>> + data = dsc->rc_edge_factor & 0xf;
>>> + data |= (dsc->rc_quant_incr_limit0 & 0x1f) << 8;
>>> + data |= (dsc->rc_quant_incr_limit1 & 0x1f) << 13;
>>> + data |= (dsc->rc_tgt_offset_high & 0xf) << 20;
>>> + data |= (dsc->rc_tgt_offset_low & 0xf) << 24;
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_CONFIG, data);
>>> +
>>> + /* program the dsc wrapper */
>>> + offset = hw_dsc->caps->sblk->ctl.base;
>>> +
>>> + data = BIT(0); /* encoder enable */
>>> + if (dsc->native_422)
>>> + data |= BIT(8);
>>> + else if (dsc->native_420)
>>> + data |= BIT(9);
>>> + if (!dsc->convert_rgb)
>>> + data |= BIT(10);
>>> + if (dsc->bits_per_component == 8)
>>> + data |= BIT(11);
>>> + if (mode & DSC_MODE_SPLIT_PANEL)
>>> + data |= BIT(12);
>>> + if (mode & DSC_MODE_MULTIPLEX)
>>> + data |= BIT(13);
>>> + if (!(mode & DSC_MODE_VIDEO))
>>> + data |= BIT(17);
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_CFG, data);
>>> +}
>>> +
>>> +static void dpu_hw_dsc_config_thresh_1_2(struct dpu_hw_dsc *hw_dsc,
>>> + struct drm_dsc_config *dsc)
>>> +{
>>> + struct dpu_hw_blk_reg_map *hw;
>>> + u32 offset, off;
>>> + int i, j = 0;
>>> + struct drm_dsc_rc_range_parameters *rc;
>>> + u32 data = 0, min_qp = 0, max_qp = 0, bpg_off = 0;
>>> +
>>> + if (!hw_dsc || !dsc)
>>> + return;
>>> +
>>> + offset = hw_dsc->caps->sblk->enc.base;
>>> +
>>> + hw = &hw_dsc->hw;
>>> +
>>> + rc = dsc->rc_range_params;
>>> +
>>> + /*
>>> + * With BUF_THRESH -- 14 in total
>>> + * each register contains 4 thresh values with the last register
>>> + * containing only 2 thresh values
>>> + */
>>> + off = 0;
>>> + for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++) {
>>> + data |= dsc->rc_buf_thresh[i] << (8 * j);
>>> + j++;
>>> + if ((j == 4) || (i == DSC_NUM_BUF_RANGES - 2)) {
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_BUF_THRESH_0 + off,
>>> data);
>>> + off += 4;
>>> + j = 0;
>>> + data = 0;
>>> + }
>>> + }
>>
>> This is barely understandable code. The following line is much better:
>>
>> DPU_REG_WRITE(hw, offset + DSC_RC_BUF_THRESH_0,
>> (dsc->rc_buf_thresh[0] << 0) |
>> (dsc->rc_buf_thresh[1] << 8) |
>> (dsc->rc_buf_thresh[2] << 16) |
>> (dsc->rc_buf_thresh[3] << 24));
>>
>> etc.
>>
>> Please unroll both loops.
>>
>>> +
>>> +
>>> + /*
>>> + * with min/max_QP -- 5 bits each
>>> + * each register contains 5 min_qp or max_qp for total of 15
>>> + *
>>> + * With BPG_OFFSET -- 6 bits each
>>> + * each register contains 5 BPG_offset for total of 15
>>> + */
>>> + off = 0;
>>> + for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
>>> + min_qp |= rc[i].range_min_qp << (5 * j);
>>> + max_qp |= rc[i].range_max_qp << (5 * j);
>>> + bpg_off |= rc[i].range_bpg_offset << (6 * j);
>>> + j++;
>>> + if (j == 5) {
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_MIN_QP_0 + off, min_qp);
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_MAX_QP_0 + off, max_qp);
>>> + DPU_REG_WRITE(hw, offset + DSC_RC_RANGE_BPG_OFFSETS_0 +
>>> off, bpg_off);
>>> + off += 4;
>>> + j = 0;
>>> + min_qp = 0;
>>> + max_qp = 0;
>>> + bpg_off = 0;
>>> + }
>>> + }
>>> +}
>>> +
>>> +static void dpu_hw_dsc_bind_pingpong_blk_1_2(
>>> + struct dpu_hw_dsc *hw_dsc,
>>> + bool enable,
>>> + const enum dpu_pingpong pp)
>>> +{
>>> + struct dpu_hw_blk_reg_map *hw;
>>> + int offset;
>>> + int mux_cfg = 0xf; /* Disabled */
>>> +
>>> + offset = hw_dsc->caps->sblk->ctl.base;
>>> +
>>> + hw = &hw_dsc->hw;
>>> + if (enable)
>>> + mux_cfg = (pp - PINGPONG_0) & 0x7;
>>> +
>>> + DPU_REG_WRITE(hw, offset + DSC_CTL, mux_cfg);
>>> +}
>>
>> Please refactor the existing bind_pingpong_blk() semantics to accept
>> either a valid PINGPONG_n, or PINGPONG_NONE to disable the binding.
>
> Could you please give me more details for this comment.
>
> both dsc_1_1 and dsc_1_2 are required to select and set mux bits of
> mux_cfg to binding dsc and pingpong together.
Yes. I was refererring to the function interface. You pass both `bool
enable` and PP index. The index doesn't make sense for 'disable' case.
So we can use a single argument of `enum dpu_pingpong` type. Pass
PINGPONG_n for binding it. Pass PINGPONG_NONE for removing the binding.
>
--
With best wishes
Dmitry
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