Re: [PATCH 2/3] media: cedrus: Fix H264 4k support

Paul Kocialkowski
2019-11-04T10:13:31Z

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Hi,

On Sat 26 Oct 19, 09:49, Jernej Skrabec wrote:
> H264 decoder needs additional or bigger buffers in order to decode 4k
> videos.

Thanks for the fixup, we hadn't looked into those bits at all during initial
bringup of H.264!

See a few minor comments below.

> Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
> ---
> drivers/staging/media/sunxi/cedrus/cedrus.h | 7 ++
> .../staging/media/sunxi/cedrus/cedrus_h264.c | 83 +++++++++++++++++--
> .../staging/media/sunxi/cedrus/cedrus_regs.h | 11 +++
> 3 files changed, 93 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
> index c45fb9a7ad07..96765555ab8a 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus.h
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
> @@ -116,8 +116,15 @@ struct cedrus_ctx {
> ssize_t mv_col_buf_size;
> void *pic_info_buf;
> dma_addr_t pic_info_buf_dma;
> + ssize_t pic_info_buf_size;
> void *neighbor_info_buf;
> dma_addr_t neighbor_info_buf_dma;
> + void *deblk_buf;
> + dma_addr_t deblk_buf_dma;
> + ssize_t deblk_buf_size;
> + void *intra_pred_buf;
> + dma_addr_t intra_pred_buf_dma;
> + ssize_t intra_pred_buf_size;
> } h264;
> struct {
> void *mv_col_buf;
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> index d2c854ecdf15..19962f4213d4 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> @@ -39,7 +39,6 @@ struct cedrus_h264_sram_ref_pic {
> #define CEDRUS_H264_FRAME_NUM 18
>
> #define CEDRUS_NEIGHBOR_INFO_BUF_SIZE (16 * SZ_1K)
> -#define CEDRUS_PIC_INFO_BUF_SIZE (128 * SZ_1K)

Could we keep a define with the minimum size that you are using later
(increased to 130 * SZ_1K)?

> static void cedrus_h264_write_sram(struct cedrus_dev *dev,
> enum cedrus_h264_sram_off off,
> @@ -342,6 +341,20 @@ static void cedrus_set_params(struct cedrus_ctx *ctx,
> VE_H264_VLD_ADDR_FIRST | VE_H264_VLD_ADDR_VALID |
> VE_H264_VLD_ADDR_LAST);
>
> + if (ctx->src_fmt.width > 2048) {
> + cedrus_write(dev, VE_BUF_CTRL,
> + VE_BUF_CTRL_INTRAPRED_MIXED_RAM |
> + VE_BUF_CTRL_DBLK_MIXED_RAM);
> + cedrus_write(dev, VE_DBLK_DRAM_BUF_ADDR,
> + ctx->codec.h264.deblk_buf_dma);
> + cedrus_write(dev, VE_INTRAPRED_DRAM_BUF_ADDR,
> + ctx->codec.h264.intra_pred_buf_dma);
> + } else {
> + cedrus_write(dev, VE_BUF_CTRL,
> + VE_BUF_CTRL_INTRAPRED_INT_SRAM |
> + VE_BUF_CTRL_DBLK_INT_SRAM);
> + }
> +
> /*
> * FIXME: Since the bitstream parsing is done in software, and
> * in userspace, this shouldn't be needed anymore. But it
> @@ -502,18 +515,28 @@ static void cedrus_h264_setup(struct cedrus_ctx *ctx,
> static int cedrus_h264_start(struct cedrus_ctx *ctx)
> {
> struct cedrus_dev *dev = ctx->dev;
> + unsigned int pic_info_size;
> unsigned int field_size;
> unsigned int mv_col_size;
> int ret;
>

Maybe add a comment here this is a half-magic sub-optimal formula?

> + if (ctx->src_fmt.width > 2048)
> + pic_info_size = CEDRUS_H264_FRAME_NUM * 0x4000;
> + else
> + pic_info_size = CEDRUS_H264_FRAME_NUM * 0x1000;
> +
> /*
> - * FIXME: It seems that the H6 cedarX code is using a formula
> - * here based on the size of the frame, while all the older
> - * code is using a fixed size, so that might need to be
> - * changed at some point.
> + * FIXME: If V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY is set,
> + * there is no need to multiply by 2.
> */
> + pic_info_size += ctx->src_fmt.height * 2 * 64;
> +
> + if (pic_info_size < 130 * SZ_1K)
> + pic_info_size = 130 * SZ_1K;

This is where I think we could have a "minimum pic info size" define.

> +
> + ctx->codec.h264.pic_info_buf_size = pic_info_size;
> ctx->codec.h264.pic_info_buf =
> - dma_alloc_coherent(dev->dev, CEDRUS_PIC_INFO_BUF_SIZE,
> + dma_alloc_coherent(dev->dev, ctx->codec.h264.pic_info_buf_size,
> &ctx->codec.h264.pic_info_buf_dma,
> GFP_KERNEL);
> if (!ctx->codec.h264.pic_info_buf)
> @@ -566,15 +589,51 @@ static int cedrus_h264_start(struct cedrus_ctx *ctx)
> goto err_neighbor_buf;
> }
>
> + if (ctx->src_fmt.width > 2048) {

Feel free to add a comment here to explain where the 12 below comes from if you
have some idea, or that it's a somewhat magical value that generally works.

> + ctx->codec.h264.deblk_buf_size =
> + ALIGN(ctx->src_fmt.width, 32) * 12;
> + ctx->codec.h264.deblk_buf =
> + dma_alloc_coherent(dev->dev,
> + ctx->codec.h264.deblk_buf_size,
> + &ctx->codec.h264.deblk_buf_dma,
> + GFP_KERNEL);
> + if (!ctx->codec.h264.deblk_buf) {
> + ret = -ENOMEM;
> + goto err_mv_col_buf;
> + }
> +

Same here, a comment would be welcome about the 5 value below.

Cheers,

Paul

> + ctx->codec.h264.intra_pred_buf_size =
> + ALIGN(ctx->src_fmt.width, 64) * 5;
> + ctx->codec.h264.intra_pred_buf =
> + dma_alloc_coherent(dev->dev,
> + ctx->codec.h264.intra_pred_buf_size,
> + &ctx->codec.h264.intra_pred_buf_dma,
> + GFP_KERNEL);
> + if (!ctx->codec.h264.intra_pred_buf) {
> + ret = -ENOMEM;
> + goto err_deblk_buf;
> + }
> + }
> +
> return 0;
>
> +err_deblk_buf:
> + dma_free_coherent(dev->dev, ctx->codec.h264.deblk_buf_size,
> + ctx->codec.h264.deblk_buf,
> + ctx->codec.h264.deblk_buf_dma);
> +
> +err_mv_col_buf:
> + dma_free_coherent(dev->dev, ctx->codec.h264.mv_col_buf_size,
> + ctx->codec.h264.mv_col_buf,
> + ctx->codec.h264.mv_col_buf_dma);
> +
> err_neighbor_buf:
> dma_free_coherent(dev->dev, CEDRUS_NEIGHBOR_INFO_BUF_SIZE,
> ctx->codec.h264.neighbor_info_buf,
> ctx->codec.h264.neighbor_info_buf_dma);
>
> err_pic_buf:
> - dma_free_coherent(dev->dev, CEDRUS_PIC_INFO_BUF_SIZE,
> + dma_free_coherent(dev->dev, ctx->codec.h264.pic_info_buf_size,
> ctx->codec.h264.pic_info_buf,
> ctx->codec.h264.pic_info_buf_dma);
> return ret;
> @@ -590,9 +649,17 @@ static void cedrus_h264_stop(struct cedrus_ctx *ctx)
> dma_free_coherent(dev->dev, CEDRUS_NEIGHBOR_INFO_BUF_SIZE,
> ctx->codec.h264.neighbor_info_buf,
> ctx->codec.h264.neighbor_info_buf_dma);
> - dma_free_coherent(dev->dev, CEDRUS_PIC_INFO_BUF_SIZE,
> + dma_free_coherent(dev->dev, ctx->codec.h264.pic_info_buf_size,
> ctx->codec.h264.pic_info_buf,
> ctx->codec.h264.pic_info_buf_dma);
> + if (ctx->codec.h264.deblk_buf_size)
> + dma_free_coherent(dev->dev, ctx->codec.h264.deblk_buf_size,
> + ctx->codec.h264.deblk_buf,
> + ctx->codec.h264.deblk_buf_dma);
> + if (ctx->codec.h264.intra_pred_buf_size)
> + dma_free_coherent(dev->dev, ctx->codec.h264.intra_pred_buf_size,
> + ctx->codec.h264.intra_pred_buf,
> + ctx->codec.h264.intra_pred_buf_dma);
> }
>
> static void cedrus_h264_trigger(struct cedrus_ctx *ctx)
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_regs.h b/drivers/staging/media/sunxi/cedrus/cedrus_regs.h
> index ace3d49fcd82..7beb03d3bb39 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_regs.h
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_regs.h
> @@ -46,6 +46,17 @@
> #define VE_MODE_DEC_H264 (0x01 << 0)
> #define VE_MODE_DEC_MPEG (0x00 << 0)
>
> +#define VE_BUF_CTRL 0x50
> +
> +#define VE_BUF_CTRL_INTRAPRED_EXT_RAM (0x02 << 2)
> +#define VE_BUF_CTRL_INTRAPRED_MIXED_RAM (0x01 << 2)
> +#define VE_BUF_CTRL_INTRAPRED_INT_SRAM (0x00 << 2)
> +#define VE_BUF_CTRL_DBLK_EXT_RAM (0x02 << 0)
> +#define VE_BUF_CTRL_DBLK_MIXED_RAM (0x01 << 0)
> +#define VE_BUF_CTRL_DBLK_INT_SRAM (0x00 << 0)
> +
> +#define VE_DBLK_DRAM_BUF_ADDR 0x54
> +#define VE_INTRAPRED_DRAM_BUF_ADDR 0x58
> #define VE_PRIMARY_CHROMA_BUF_LEN 0xc4
> #define VE_PRIMARY_FB_LINE_STRIDE 0xc8
>
> --
> 2.23.0
>

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