[PATCH v2 1/7] drm/msm/dpu: add support for DSC encoder v1.2 engine
Kuogee Hsieh
quic_khsieh at quicinc.com
Mon May 1 20:40:55 UTC 2023
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 at intel.com>
>
> What exactly was reported?
>
>> Signed-off-by: Kuogee Hsieh <quic_khsieh at quicinc.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.
>
>> +
>> +static void _setup_dcs_ops_1_2(struct dpu_hw_dsc_ops *ops,
>> + const unsigned long features)
>> +{
>> + ops->dsc_disable = dpu_hw_dsc_disable_1_2;
>> + ops->dsc_config = dpu_hw_dsc_config_1_2;
>> + ops->dsc_config_thresh = dpu_hw_dsc_config_thresh_1_2;
>> + ops->dsc_bind_pingpong_blk = dpu_hw_dsc_bind_pingpong_blk_1_2;
>> +}
>
> Please inline the function.
>
>> +
>> +struct dpu_hw_dsc *dpu_hw_dsc_init_1_2(const struct dpu_dsc_cfg *cfg,
>> + void __iomem *addr)
>> +{
>> + struct dpu_hw_dsc *c;
>> +
>> + c = kzalloc(sizeof(*c), GFP_KERNEL);
>> + if (!c)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + c->hw.blk_addr = addr + cfg->base;
>> + c->hw.log_mask = DPU_DBG_MASK_DSC;
>> +
>> + c->idx = cfg->id;
>> + c->caps = cfg;
>> + _setup_dcs_ops_1_2(&c->ops, c->caps->features);
>> +
>> + return c;
>> +}
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
>> index 3452f88..b2f618f6 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
>> @@ -1,6 +1,7 @@
>> // SPDX-License-Identifier: GPL-2.0-only
>> /*
>> * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
>> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights
>> reserved.
>> */
>> #define pr_fmt(fmt) "[drm:%s] " fmt, __func__
>> @@ -250,7 +251,11 @@ int dpu_rm_init(struct dpu_rm *rm,
>> struct dpu_hw_dsc *hw;
>> const struct dpu_dsc_cfg *dsc = &cat->dsc[i];
>> - hw = dpu_hw_dsc_init(dsc, mmio);
>> + if (test_bit(DPU_DSC_HW_REV_1_2, &dsc->features))
>> + hw = dpu_hw_dsc_init_1_2(dsc, mmio);
>> + else
>> + hw = dpu_hw_dsc_init(dsc, mmio);
>> +
>> if (IS_ERR_OR_NULL(hw)) {
>> rc = PTR_ERR(hw);
>> DPU_ERROR("failed dsc object creation: err %d\n", rc);
>
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