Hello Pankaj,
On 12/16/2016 08:48 AM, Pankaj Dubey wrote:
> From: Smitha T Murthy <smith...@samsung.com>
>
> commit 2548fee63d9e ("[media] media/platform: convert drivers to use the new
> vb2_queue dev field") has missed to set dev pointer of vb2_queue which will be
> used in reqbufs of mfc driver. Without this change following error is
> observed:
>
> ---------------------------------------------------------------
> V4L2 Codec decoding example application
> Kamil Debski <k.deb...@samsung.com>
> Copyright 2012 Samsung Electronics Co., Ltd.
>
> Opening MFC.
> (mfc.c:mfc_open:58): MFC Info (/dev/video0): driver="s5p-mfc" \
> bus_info="platform:12c30000.mfc0" card="s5p-mfc-dec" fd=0x4[
> 42.339165] Remapping memory failed, error: -6
>
> MFC Open Success.
> (main.c:main:711): Successfully opened all necessary files and devices
> (mfc.c:mfc_dec_setup_output:103): Setup MFC decoding OUTPUT buffer \
> size=4194304 (requested=4194304)
> (mfc.c:mfc_dec_setup_output:120): Number of MFC OUTPUT buffers is 2 \
> (requested 2)
>
> [App] Out buf phy : 0x00000000, virt : 0xffffffff
> Output Length is = 0x300000
> Error (mfc.c:mfc_dec_setup_output:145): Failed to MMAP MFC OUTPUT buffer
> -------------------------------------------------------
>
On which kernel version did you face this issue?
> Signed-off-by: Smitha T Murthy <smith...@samsung.com>
> [pankaj.dubey: debugging issue and formatting commit message]
> Signed-off-by: Pankaj Dubey <pankaj.du...@samsung.com>
> ---
> drivers/media/platform/s5p-mfc/s5p_mfc.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c
> b/drivers/media/platform/s5p-mfc/s5p_mfc.c
> index 0a5b8f5..6ea8246 100644
> --- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
> +++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
> @@ -838,6 +838,7 @@ static int s5p_mfc_open(struct file *file)
> q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> q->drv_priv = &ctx->fh;
> q->lock = &dev->mfc_mutex;
> + q->dev = &dev->plat_dev->dev;
> if (vdev == dev->vfd_dec) {
> q->io_modes = VB2_MMAP;
> q->ops = get_dec_queue_ops();
> @@ -861,6 +862,7 @@ static int s5p_mfc_open(struct file *file)
> q->io_modes = VB2_MMAP;
> q->drv_priv = &ctx->fh;
> q->lock = &dev->mfc_mutex;
> + q->dev = &dev->plat_dev->dev;
> if (vdev == dev->vfd_dec) {
> q->io_modes = VB2_MMAP;
> q->ops = get_dec_queue_ops();
>
Please correct me if I'm wrong, but AFAIU this shouldn't be needed in
the s5p-mfc driver since the videobuf2 core either uses the vb2_queue
.dev field or the vb2_queue .alloc_devs. And the latter is set in the
s5p_mfc_queue_setup() function, so the .dev field shouldn't be used.
Best regards,
--
Javier Martinez Canillas
Open Source Group
Samsung Research America
