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SubjectRe: [PATCH v3 2/2] media: cedrus: Add H264 decoding support
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On Mon, 2019-02-11 at 15:39 +0100, Maxime Ripard wrote:
> Introduce some basic H264 decoding support in cedrus. So far, only the
> baseline profile videos have been tested, and some more advanced features
> used in higher profiles are not even implemented.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
[..]


> +static void _cedrus_write_ref_list(struct cedrus_ctx *ctx,
> + struct cedrus_run *run,
> + const u8 *ref_list, u8 num_ref,
> + enum cedrus_h264_sram_off sram)
> +{
> + const struct v4l2_ctrl_h264_decode_param *decode = run->h264.decode_param;
> + struct vb2_queue *cap_q = &ctx->fh.m2m_ctx->cap_q_ctx.q;
> + const struct vb2_buffer *dst_buf = &run->dst->vb2_buf;
> + struct cedrus_dev *dev = ctx->dev;
> + u8 sram_array[CEDRUS_MAX_REF_IDX];
> + unsigned int size, i;
> +
> + memset(sram_array, 0, sizeof(sram_array));
> +
> + for (i = 0; i < num_ref; i++) {
> + const struct v4l2_h264_dpb_entry *dpb;
> + const struct cedrus_buffer *cedrus_buf;
> + const struct vb2_v4l2_buffer *ref_buf;
> + unsigned int position;
> + int buf_idx;
> + u8 dpb_idx;
> +
> + dpb_idx = ref_list[i];
> + dpb = &decode->dpb[dpb_idx];
> +
> + if (!(dpb->flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE))
> + continue;
> +
> + if (dst_buf->timestamp == dpb->timestamp)
> + buf_idx = dst_buf->index;
> + else
> + buf_idx = vb2_find_timestamp(cap_q, dpb->timestamp, 0);
> +
> + if (buf_idx < 0)
> + continue;
> +
> + ref_buf = to_vb2_v4l2_buffer(ctx->dst_bufs[buf_idx]);
> + cedrus_buf = vb2_v4l2_to_cedrus_buffer(ref_buf);
> + position = cedrus_buf->codec.h264.position;
> +
> + sram_array[i] |= position << 1;
> + if (ref_buf->field == V4L2_FIELD_BOTTOM)
> + sram_array[i] |= BIT(0);
> + }
> +
> + size = min((unsigned int)ALIGN(num_ref, 4), sizeof(sram_array));

Perhaps s/unsigned int/size_t, so the arguments to min() have the same type?

Otherwise, I got this warning:

/home/zeta/repos/linux/media_tree/drivers/staging/media/sunxi/cedrus/cedrus_h264.c: In function ‘_cedrus_write_ref_list’:
/home/zeta/repos/linux/media_tree/include/linux/kernel.h:846:29: warning: comparison of distinct pointer types lacks a cast
(!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))

Regards,
Ez

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