Re: [PATCH 1/3] media: rockchip: Introduce the rkvdec2 driver

Detlev Casanova
2024-06-17T13:56:38Z

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On Sunday, June 16, 2024 5:40:25 P.M. EDT Jonas Karlman wrote:
> Hi Detlev,
>
> A few quick notes below, will do a more in depth review later.
>
> On 2024-06-15 03:56, Detlev Casanova wrote:
> > This driver supports the second generation of the Rockchip Video
> > decoder, also known as vdpu34x.
> > It is currently only used on the RK3588(s) SoC.
> >
> > There are 2 decoders on the RK3588 SoC that can work in pair to decode
> > 8K video at 30 FPS but currently, only using one core at a time is
> > supported.
> >
> > Scheduling requests between the two cores will be implemented later.
> >
> > The core supports H264, HEVC, VP9 and AVS2 decoding but this driver
> > currently only supports H264.
> >
> > The driver is based on rkvdec and they may share some code in the
> > future.
> > The decision to make a different driver is mainly because rkvdec2 has
> > more features and can work with multiple cores.
>
> Please elaborate on the "more features" part, to my knowledge the main
> difference is multiple cores and updated/extended regs.
>
> Is more features refering to the linked list/table feature?, a feature
> already present in the vdpu341 (rk3328) variant.
>
> Hopefully both drivers can be combined and/or share common parts before
> this leave staging.

Yes, those are the features. There are also small differences in the PPS fields
(pic size field width is bigger here, which changes the alignment later).
I don't know if other differences exist, but although I don't believe the
drivers should be merged (Avoiding recreating a bigger complex driver like
hantro), sharing code for the 2 drivers would be great.

> > The registers are mapped in a struct in RAM using bitfields. It is IO
> > copied to the HW when all values are configured.
> > The decision to use such a struct instead of writing buffers one by one
> >
> > is based on the following reasons:
> > - Rockchip cores are known to misbehave when registers are not written
> >
> > in address order,
> >
> > - Those cores also need the software to write all registers, even if
> >
> > they are written their default values or are not related to the task
> > (this core will not start decoding some H264 frames if some VP9
> > registers are not written to 0)
> >
> > - In the future, to support multiple cores, the scheduler could be
> >
> > optimized by storing the precomputed registers values and copy them
> > to the HW as soos as a core becomes available.
> >
> > This makes the code more readable and may bring performance improvements
> > in future features.
> >
> > Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
> > ---
> >
> > drivers/staging/media/Kconfig | 1 +
> > drivers/staging/media/Makefile | 1 +
> > drivers/staging/media/rkvdec2/Kconfig | 15 +
> > drivers/staging/media/rkvdec2/Makefile | 3 +
> > drivers/staging/media/rkvdec2/TODO | 13 +
> > drivers/staging/media/rkvdec2/rkvdec2-h264.c | 899 ++++++++++++++
> > drivers/staging/media/rkvdec2/rkvdec2-regs.h | 372 ++++++
> > drivers/staging/media/rkvdec2/rkvdec2.c | 1160 ++++++++++++++++++
> > drivers/staging/media/rkvdec2/rkvdec2.h | 123 ++
> > 9 files changed, 2587 insertions(+)
> > create mode 100644 drivers/staging/media/rkvdec2/Kconfig
> > create mode 100644 drivers/staging/media/rkvdec2/Makefile
> > create mode 100644 drivers/staging/media/rkvdec2/TODO
> > create mode 100644 drivers/staging/media/rkvdec2/rkvdec2-h264.c
> > create mode 100644 drivers/staging/media/rkvdec2/rkvdec2-regs.h
> > create mode 100644 drivers/staging/media/rkvdec2/rkvdec2.c
> > create mode 100644 drivers/staging/media/rkvdec2/rkvdec2.h
>
> [snip]
>
> > diff --git a/drivers/staging/media/rkvdec2/rkvdec2-regs.h
> > b/drivers/staging/media/rkvdec2/rkvdec2-regs.h new file mode 100644
> > index 000000000000..a214597cdcdc
> > --- /dev/null
> > +++ b/drivers/staging/media/rkvdec2/rkvdec2-regs.h
>
> [snip]
>
> > +
> > +/* base: OFFSET_COMMON_REGS */
> > +struct rkvdec2_regs_common {
> > + struct rkvdec2_in_out {
> > + u32 in_endian : 1;
> > + u32 in_swap32_e : 1;
> > + u32 in_swap64_e : 1;
> > + u32 str_endian : 1;
> > + u32 str_swap32_e : 1;
> > + u32 str_swap64_e : 1;
> > + u32 out_endian : 1;
> > + u32 out_swap32_e : 1;
> > + u32 out_cbcr_swap : 1;
> > + u32 out_swap64_e : 1;
> > + u32 reserved : 22;
> > + } reg008;
> > +
> > + struct rkvdec2_dec_mode {
> > + u32 dec_mode : 10;
> > + u32 reserved : 22;
> > + } reg009;
> > +
> > + struct rkvdec2_dec_e {
> > + u32 dec_e : 1;
> > + u32 reserved : 31;
> > + } reg010;
> > +
> > + struct rkvdec2_important_en {
> > + u32 reserved : 1;
> > + u32 dec_clkgate_e : 1;
> > + u32 dec_e_strmd_clkgate_dis : 1;
> > + u32 reserved0 : 1;
> > +
> > + u32 dec_irq_dis : 1;
> > + u32 dec_timeout_e : 1;
> > + u32 buf_empty_en : 1;
> > + u32 reserved1 : 3;
> > +
> > + u32 dec_e_rewrite_valid : 1;
> > + u32 reserved2 : 9;
> > + u32 softrst_en_p : 1;
> > + u32 force_softreset_valid : 1;
> > + u32 reserved3 : 2;
> > + u32 pix_range_detection_e : 1;
> > + u32 reserved4 : 7;
> > + } reg011;
> > +
> > + struct rkvdec2_sencodary_en {
> > + u32 wr_ddr_align_en : 1;
> > + u32 colmv_compress_en : 1;
> > + u32 fbc_e : 1;
> > + u32 reserved0 : 1;
> > +
> > + u32 buspr_slot_disable : 1;
> > + u32 error_info_en : 1;
> > + u32 info_collect_en : 1;
> > + u32 wait_reset_en : 1;
> > +
> > + u32 scanlist_addr_valid_en : 1;
> > + u32 scale_down_en : 1;
> > + u32 error_cfg_wr_disable : 1;
> > + u32 reserved1 : 21;
> > + } reg012;
> > +
> > + struct rkvdec2_en_mode_set {
> > + u32 timeout_mode : 1;
> > + u32 req_timeout_rst_sel : 1;
> > + u32 reserved0 : 1;
> > + u32 dec_commonirq_mode : 1;
> > + u32 reserved1 : 2;
> > + u32 stmerror_waitdecfifo_empty : 1;
> > + u32 reserved2 : 2;
> > + u32 h26x_streamd_error_mode : 1;
> > + u32 reserved3 : 2;
> > + u32 allow_not_wr_unref_bframe : 1;
> > + u32 fbc_output_wr_disable : 1;
> > + u32 reserved4 : 1;
> > + u32 colmv_error_mode : 1;
> > +
> > + u32 reserved5 : 2;
> > + u32 h26x_error_mode : 1;
> > + u32 reserved6 : 2;
> > + u32 ycacherd_prior : 1;
> > + u32 reserved7 : 2;
> > + u32 cur_pic_is_idr : 1;
> > + u32 reserved8 : 1;
> > + u32 right_auto_rst_disable : 1;
> > + u32 frame_end_err_rst_flag : 1;
> > + u32 rd_prior_mode : 1;
> > + u32 rd_ctrl_prior_mode : 1;
> > + u32 reserved9 : 1;
> > + u32 filter_outbuf_mode : 1;
> > + } reg013;
> > +
> > + struct rkvdec2_fbc_param_set {
> > + u32 fbc_force_uncompress : 1;
> > +
> > + u32 reserved0 : 2;
> > + u32 allow_16x8_cp_flag : 1;
> > + u32 reserved1 : 2;
> > +
> > + u32 fbc_h264_exten_4or8_flag : 1;
> > + u32 reserved2 : 25;
> > + } reg014;
> > +
> > + struct rkvdec2_stream_param_set {
> > + u32 rlc_mode_direct_write : 1;
> > + u32 rlc_mode : 1;
> > + u32 reserved0 : 3;
> > +
> > + u32 strm_start_bit : 7;
> > + u32 reserved1 : 20;
> > + } reg015;
> > +
> > + u32 reg016_str_len;
> > +
> > + struct rkvdec2_slice_number {
> > + u32 slice_num : 25;
> > + u32 reserved : 7;
> > + } reg017;
> > +
> > + struct rkvdec2_y_hor_stride {
> > + u32 y_hor_virstride : 16;
> > + u32 reserved : 16;
> > + } reg018;
> > +
> > + struct rkvdec2_uv_hor_stride {
> > + u32 uv_hor_virstride : 16;
> > + u32 reserved : 16;
> > + } reg019;
> > +
> > + union {
> > + struct rkvdec2_y_stride {
> > + u32 y_virstride : 28;
> > + u32 reserved : 4;
> > + } reg020_y_virstride;
> > +
> > + struct rkvdec2_fbc_payload_offset {
> > + u32 reserved : 4;
> > + u32 payload_st_offset : 28;
> > + } reg020_fbc_payload_off;
> > + };
> > +
> > + struct rkvdec2_error_ctrl_set {
> > + u32 inter_error_prc_mode : 1;
> > + u32 error_intra_mode : 1;
> > + u32 error_deb_en : 1;
> > + u32 picidx_replace : 5;
> > + u32 error_spread_e : 1;
> > + u32 reserved0
: 3;
> > + u32 error_inter_pred_cross_slice : 1;
> > + u32 reserved1
: 11;
> > + u32 roi_error_ctu_cal_en : 1;
> > + u32 reserved2
: 7;
> > + } reg021;
> > +
> > + struct rkvdec2_err_roi_ctu_offset_start {
> > + u32 roi_x_ctu_offset_st : 12;
> > + u32 reserved0 : 4;
> > + u32 roi_y_ctu_offset_st : 12;
> > + u32 reserved1 : 4;
> > + } reg022;
> > +
> > + struct rkvdec2_err_roi_ctu_offset_end {
> > + u32 roi_x_ctu_offset_end : 12;
> > + u32 reserved0 : 4;
> > + u32 roi_y_ctu_offset_end : 12;
> > + u32 reserved1 : 4;
> > + } reg023;
> > +
> > + struct rkvdec2_cabac_error_en_lowbits {
> > + u32 cabac_err_en_lowbits : 32;
> > + } reg024;
> > +
> > + struct rkvdec2_cabac_error_en_highbits {
> > + u32 cabac_err_en_highbits : 30;
> > + u32 reserved : 2;
> > + } reg025;
> > +
> > + struct rkvdec2_block_gating_en {
> > + u32 swreg_block_gating_e : 20;
> > + u32 reserved : 11;
> > + u32 reg_cfg_gating_en : 1;
> > + } reg026;
> > +
> > + /* NOTE: reg027 ~ reg032 are added in vdpu38x at rk3588 */
> > + struct SW027_CORE_SAFE_PIXELS {
> > + // colmv and recon report coord x safe pixels
> > + u32 core_safe_x_pixels : 16;
> > + // colmv and recon report coord y safe pixels
> > + u32 core_safe_y_pixels : 16;
> > + } reg027;
> > +
> > + struct rkvdec2_multiply_core_ctrl {
> > + u32 swreg_vp9_wr_prob_idx : 3;
> > + u32 reserved0 : 1;
> > + u32 swreg_vp9_rd_prob_idx : 3;
> > + u32 reserved1 : 1;
> > +
> > + u32 swreg_ref_req_advance_flag : 1;
> > + u32 sw_colmv_req_advance_flag : 1;
> > + u32 sw_poc_only_highbit_flag : 1;
> > + u32 sw_poc_arb_flag : 1;
> > +
> > + u32 reserved2 : 4;
> > + u32 sw_film_idx : 10;
> > + u32 reserved3 : 2;
> > + u32 sw_pu_req_mismatch_dis : 1;
> > + u32 sw_colmv_req_mismatch_dis : 1;
> > + u32 reserved4 : 2;
> > + } reg028;
> > +
> > + struct SW029_SCALE_DOWN_CTRL {
> > + u32 scale_down_hor_ratio : 2;
> > + u32 reserved0 : 6;
> > + u32 scale_down_vrz_ratio : 2;
> > + u32 reserved1 : 22;
> > + } reg029;
> > +
> > + struct SW032_Y_SCALE_DOWN_TILE8x8_HOR_STRIDE {
> > + u32 y_scale_down_hor_stride : 20;
> > + u32 reserved0 : 12;
> > + } reg030;
> > +
> > + struct SW031_UV_SCALE_DOWN_TILE8x8_HOR_STRIDE {
> > + u32 uv_scale_down_hor_stride : 20;
> > + u32 reserved0 : 12;
> > + } reg031;
> > +
> > + u32 reg032_timeout_threshold;
> > +} __packed;
> > +
> > +/* base: OFFSET_COMMON_ADDR_REGS */
> > +struct rkvdec2_regs_common_addr {
> > + u32 reg128_rlc_base;
> > + u32 reg129_rlcwrite_base;
> > + u32 reg130_decout_base;
> > + u32 reg131_colmv_cur_base;
> > + u32 reg132_error_ref_base;
> > + u32 reg133_142_rcb_base[10];
> > +} __packed;
> > +
> > +/* base: OFFSET_CODEC_PARAMS_REGS */
> > +struct rkvdec2_regs_h264_params {
> > + struct rkvdec2_h26x_set {
> > + u32 h26x_frame_orslice : 1;
> > + u32 h26x_rps_mode : 1;
> > + u32 h26x_stream_mode : 1;
> > + u32 h26x_stream_lastpacket : 1;
> > + u32 h264_firstslice_flag : 1;
> > + u32 reserved : 27;
> > + } reg64;
>
> Please be consistent in naming the regs, some have leading zero prefix
> others do not. E.g. reg031 above and reg64 here.

Right, I'll fix that.

> > +
> > + u32 cur_top_poc;
> > + u32 cur_bot_poc;
> > + u32 reg67_98_ref_poc[32];
> > +
> > + /* Regs 99 - 102 */
> > + struct rkvdec2_h264_info {
> > + struct rkvdec2_h264_ref_info {
> > + u32 ref_field : 1;
> > + u32 ref_topfield_used : 1;
> > + u32 ref_botfield_used : 1;
> > + u32 ref_colmv_use_flag : 1;
> > + u32 ref_reserved : 4;
> > + } __packed ref_info[4];
> > + } __packed reg99_102_ref_info[4];
> > +
> > + u32 reserved_103_111[9];
> > +
> > + struct rkvdec2_error_ref_info {
> > + u32 avs2_ref_error_field : 1;
> > + u32 avs2_ref_error_topfield : 1;
> > + u32 ref_error_topfield_used : 1;
> > + u32 ref_error_botfield_used : 1;
> > + u32 reserved : 28;
> > + } reg112;
> > +} __packed;
> > +
>
> [snip]
>
> > diff --git a/drivers/staging/media/rkvdec2/rkvdec2.c
> > b/drivers/staging/media/rkvdec2/rkvdec2.c new file mode 100644
> > index 000000000000..db37fdbfc366
> > --- /dev/null
> > +++ b/drivers/staging/media/rkvdec2/rkvdec2.c
> > @@ -0,0 +1,1160 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Rockchip Video Decoder 2 driver
> > + *
> > + * Copyright (C) 2024 Collabora, Ltd.
> > + * Detlev Casanova <detlev.casanova@collabora.com>
> > + *
> > + * Based on rkvdec driver by Boris Brezillon
> > <boris.brezillon@collabora.com> + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/pm.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/slab.h>
> > +#include <linux/videodev2.h>
> > +#include <linux/workqueue.h>
> > +#include <media/v4l2-event.h>
> > +#include <media/v4l2-mem2mem.h>
> > +#include <media/videobuf2-core.h>
> > +#include <media/videobuf2-vmalloc.h>
> > +
> > +#include "rkvdec2.h"
> > +
> > +static int rkvdec2_try_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > + struct rkvdec2_ctx *ctx = container_of(ctrl->handler, struct
> > rkvdec2_ctx, ctrl_hdl); + const struct rkvdec2_coded_fmt_desc
*desc =
> > ctx->coded_fmt_desc; +
> > + if (desc->ops->try_ctrl)
> > + return desc->ops->try_ctrl(ctx, ctrl);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct v4l2_ctrl_ops rkvdec2_ctrl_ops = {
> > + .try_ctrl = rkvdec2_try_ctrl,
> > +};
> > +
> > +static const struct rkvdec2_ctrl_desc rkvdec2_h264_ctrl_descs[] = {
> > + {
> > + .cfg.id = V4L2_CID_STATELESS_H264_DECODE_PARAMS,
> > + },
> > + {
> > + .cfg.id = V4L2_CID_STATELESS_H264_SPS,
> > + .cfg.ops = &rkvdec2_ctrl_ops,
> > + },
> > + {
> > + .cfg.id = V4L2_CID_STATELESS_H264_PPS,
> > + },
> > + {
> > + .cfg.id = V4L2_CID_STATELESS_H264_SCALING_MATRIX,
> > + },
> > + {
> > + .cfg.id = V4L2_CID_STATELESS_H264_DECODE_MODE,
> > + .cfg.min = V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED,
> > + .cfg.max = V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED,
> > + .cfg.def = V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED,
> > + },
> > + {
> > + .cfg.id = V4L2_CID_STATELESS_H264_START_CODE,
> > + .cfg.min = V4L2_STATELESS_H264_START_CODE_ANNEX_B,
> > + .cfg.def = V4L2_STATELESS_H264_START_CODE_ANNEX_B,
> > + .cfg.max = V4L2_STATELESS_H264_START_CODE_ANNEX_B,
> > + },
> > + {
> > + .cfg.id = V4L2_CID_MPEG_VIDEO_H264_PROFILE,
> > + .cfg.min = V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE,
> > + .cfg.max = V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10,
>
> In an earlier comment there was mention that high 10 was not yet
> implemented?

Indeed, this need more testing. I'll either make it work or remove High 10
support from here.

> > + .cfg.menu_skip_mask =
> > + BIT(V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED),
> > + .cfg.def = V4L2_MPEG_VIDEO_H264_PROFILE_MAIN,
> > + },
> > + {
> > + .cfg.id = V4L2_CID_MPEG_VIDEO_H264_LEVEL,
> > + .cfg.min = V4L2_MPEG_VIDEO_H264_LEVEL_1_0,
> > + .cfg.max = V4L2_MPEG_VIDEO_H264_LEVEL_6_0,
> > + },
> > +};
> > +
>
> [snip]
>
> > +
> > +static int rkvdec2_queue_init(void *priv,
> > + struct vb2_queue *src_vq,
> > + struct vb2_queue *dst_vq)
> > +{
> > + struct rkvdec2_ctx *ctx = priv;
> > + struct rkvdec2_dev *rkvdec = ctx->dev;
> > + int ret;
> > +
> > + src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> > + src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> > + src_vq->drv_priv = ctx;
> > + src_vq->ops = &rkvdec2_queue_ops;
> > + src_vq->mem_ops = &vb2_dma_contig_memops;
> > +
> > + /*
> > + * Driver does mostly sequential access, so sacrifice TLB efficiency
> > + * for faster allocation. Also, no CPU access on the source queue,
> > + * so no kernel mapping needed.
> > + */
> > + src_vq->dma_attrs = DMA_ATTR_ALLOC_SINGLE_PAGES |
>
> Do we really need to use ALLOC_SINGLE_PAGES flag, e.g. use 4K pages?
>
> Was probably only needed for 32-bit to work with the arm mmu instead
> of the rk iommu present on all newer socs.
>
> Also, allocating chunks of 4 MiB should help reduce resources
> required for export/import of video buffers to display pipeline.

Probably not needed indeed.

> > + DMA_ATTR_NO_KERNEL_MAPPING;
> > + src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
> > + src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> > + src_vq->lock = &rkvdec->vdev_lock;
> > + src_vq->dev = rkvdec->v4l2_dev.dev;
> > + src_vq->supports_requests = true;
> > + src_vq->requires_requests = true;
> > +
> > + ret = vb2_queue_init(src_vq);
> > + if (ret)
> > + return ret;
> > +
> > + dst_vq->bidirectional = true;
> > + dst_vq->mem_ops = &vb2_dma_contig_memops;
> > + dst_vq->dma_attrs = DMA_ATTR_ALLOC_SINGLE_PAGES |
>
> Same here.
>
> > + DMA_ATTR_NO_KERNEL_MAPPING;
> > + dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> > + dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> > + dst_vq->drv_priv = ctx;
> > + dst_vq->ops = &rkvdec2_queue_ops;
> > + dst_vq->buf_struct_size = sizeof(struct rkvdec2_decoded_buffer);
> > + dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> > + dst_vq->lock = &rkvdec->vdev_lock;
> > + dst_vq->dev = rkvdec->v4l2_dev.dev;
> > +
> > + return vb2_queue_init(dst_vq);
> > +}
> > +
> > +static int rkvdec2_add_ctrls(struct rkvdec2_ctx *ctx,
> > + const struct rkvdec2_ctrls *ctrls)
> > +{
> > + unsigned int i;
> > +
> > + for (i = 0; i < ctrls->num_ctrls; i++) {
> > + const struct v4l2_ctrl_config *cfg = &ctrls-
>ctrls[i].cfg;
> > +
> > + v4l2_ctrl_new_custom(&ctx->ctrl_hdl, cfg, ctx);
> > + if (ctx->ctrl_hdl.error)
> > + return ctx->ctrl_hdl.error;
> > + }
> > +
> > + return 0;
> > +}
> > +
>
> [snip]
>
> > +
> > +static int rkvdec2_probe(struct platform_device *pdev)
> > +{
> > + struct rkvdec2_dev *rkvdec;
> > + unsigned int i;
> > + int ret, irq;
> > +
> > + rkvdec = devm_kzalloc(&pdev->dev, sizeof(*rkvdec), GFP_KERNEL);
> > + if (!rkvdec)
> > + return -ENOMEM;
> > +
> > + platform_set_drvdata(pdev, rkvdec);
> > + rkvdec->dev = &pdev->dev;
> > +
> > + mutex_init(&rkvdec->vdev_lock);
> > + INIT_DELAYED_WORK(&rkvdec->watchdog_work, rkvdec2_watchdog_func);
> > +
> > + rkvdec->clocks = devm_kcalloc(&pdev->dev,
ARRAY_SIZE(rkvdec2_clk_names),
> > + sizeof(*rkvdec->clocks),
GFP_KERNEL);
> > + if (!rkvdec->clocks)
> > + return -ENOMEM;
> > +
> > + for (i = 0; i < ARRAY_SIZE(rkvdec2_clk_names); i++)
> > + rkvdec->clocks[i].id = rkvdec2_clk_names[i];
> > +
> > + ret = devm_clk_bulk_get(&pdev->dev, ARRAY_SIZE(rkvdec2_clk_names),
> > + rkvdec->clocks);
> > + if (ret)
> > + return ret;
> > +
> > + rkvdec->regs = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(rkvdec->regs))
> > + return PTR_ERR(rkvdec->regs);
> > +
> > + ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
>
> I am expecting that this should be albe to work with 40 bits together
> with the iommu. I know too little about dma subsystem to know if this
> mask refers to the iova or the physical memory that can be used.
>
> With the iommu in use we should be able to use buffers in 40-bit
> addressable physical memory.

Right but we don't use the rk iommu yet. I don't think we can go higher than
32 bits memory without it, but I can check.

> > + if (ret) {
> > + dev_err(&pdev->dev, "Could not set DMA coherent mask.
\n");
> > + return ret;
> > + }
> > +
> > + vb2_dma_contig_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
> > +
> > + irq = platform_get_irq(pdev, 0);
> > + if (irq <= 0)
> > + return -ENXIO;
> > +
> > + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
> > + rkvdec2_irq_handler,
IRQF_ONESHOT,
> > + dev_name(&pdev->dev),
rkvdec);
> > + if (ret) {
> > + dev_err(&pdev->dev, "Could not request vdec2 IRQ\n");
> > + return ret;
> > + }
> > +
> > + pm_runtime_set_autosuspend_delay(&pdev->dev, 100);
> > + pm_runtime_use_autosuspend(&pdev->dev);
> > + pm_runtime_enable(&pdev->dev);
> > +
> > + ret = clk_bulk_prepare_enable(ARRAY_SIZE(rkvdec2_clk_names),
> > rkvdec->clocks); + if (ret) {
> > + dev_err(&pdev->dev, "Could not start clocks\n");
> > + return ret;
> > + }
> > +
> > + ret = rkvdec2_v4l2_init(rkvdec);
> > + if (ret)
> > + goto err_disable_runtime_pm;
> > +
> > + return 0;
> > +
> > +err_disable_runtime_pm:
> > + pm_runtime_dont_use_autosuspend(&pdev->dev);
> > + pm_runtime_disable(&pdev->dev);
> > + return ret;
> > +}
> > +
>
> [snip]

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