On 11/14/2014 12:20 PM, Nikhil Devshatwar wrote:
> The data_offset in v4l2_planes structure will help us point to the start of
> data content for that particular plane. This may be useful when a single
> buffer contains the data for different planes e.g. Y planes of two fields in
> the same buffer. With this, user space can pass queue top field and
> bottom field with same dmafd and different data_offsets.
>
> Signed-off-by: Nikhil Devshatwar <nikhil...@ti.com>
> ---
> drivers/media/platform/ti-vpe/vpe.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/ti-vpe/vpe.c
> b/drivers/media/platform/ti-vpe/vpe.c
> index 0ae19ee..e59eb81 100644
> --- a/drivers/media/platform/ti-vpe/vpe.c
> +++ b/drivers/media/platform/ti-vpe/vpe.c
> @@ -495,6 +495,14 @@ struct vpe_mmr_adb {
>
> #define VPE_SET_MMR_ADB_HDR(ctx, hdr, regs, offset_a) \
> VPDMA_SET_MMR_ADB_HDR(ctx->mmr_adb, vpe_mmr_adb, hdr, regs, offset_a)
> +
> +static inline dma_addr_t vb2_dma_addr_plus_data_offset(struct vb2_buffer *vb,
> + unsigned int plane_no)
> +{
> + return vb2_dma_contig_plane_dma_addr(vb, plane_no) +
> + vb->v4l2_planes[plane_no].data_offset;
> +}
> +
> /*
> * Set the headers for all of the address/data block structures.
> */
> @@ -1002,7 +1010,7 @@ static void add_out_dtd(struct vpe_ctx *ctx, int port)
> int plane = fmt->coplanar ? p_data->vb_part : 0;
>
> vpdma_fmt = fmt->vpdma_fmt[plane];
> - dma_addr = vb2_dma_contig_plane_dma_addr(vb, plane);
> + dma_addr = vb2_dma_addr_plus_data_offset(vb, plane);
> if (!dma_addr) {
> vpe_err(ctx->dev,
> "acquiring output buffer(%d) dma_addr failed\n",
> @@ -1042,7 +1050,7 @@ static void add_in_dtd(struct vpe_ctx *ctx, int port)
>
> vpdma_fmt = fmt->vpdma_fmt[plane];
>
> - dma_addr = vb2_dma_contig_plane_dma_addr(vb, plane);
> + dma_addr = vb2_dma_addr_plus_data_offset(vb, plane);
> if (!dma_addr) {
> vpe_err(ctx->dev,
> "acquiring input buffer(%d) dma_addr failed\n",
>
I suspect this does not do what you want. data_offset is set by the application
for an output stream (i.e. from memory to the hardware) and it is set by the
driver for a capture stream (i.e. from hardware to memory). It looks like you
expect that it is set by the application for capture streams as well, but
that's not true.
Regards,
Hans
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