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

Paul Kocialkowski
2019-11-05T08:07:32Z

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Hi Jernej,

On Mon 04 Nov 19, 17:53, Jernej Škrabec wrote:
> Dne ponedeljek, 04. november 2019 ob 11:13:19 CET je Paul Kocialkowski
> napisal(a):
> > 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)?
>
> Sure.
>
> >
> > > 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?
>
> Well, I'm not sure how much suboptimal formulas this and those below are. They
> are taken from CedarX source. I would imagine that they didn't waste too much
> memory. What kind of comment would be ok for you? "Formula taken from CedarX
> source"?

Yes, something like that would work fine. The point is to make it clear that
it is not an obvious or direct calculation based on something from the spec.

Cheers,

Paul

> Best regards,
> Jernej
>
> >
> > > + 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
>
>
>
>

--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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