Re: [Patch 05/13] media: am437x-vpfe: Streamlined vb2 buffer cleanup

Benoit Parrot
2019-09-16T14:51:57Z

Lad, Prabhakar <prabhakar.csengg@gmail.com> wrote on Mon [2019-Sep-16 09:00:03 +0100]:
> Hi Benoit,
>
> Thank you for the patch.
>
> On Mon, Sep 9, 2019 at 5:26 PM Benoit Parrot <bparrot@ti.com> wrote:
> >
> > Returning queued vb2 buffers back to user space is a common
> > task best handled by a helper function.
> >
> > Signed-off-by: Benoit Parrot <bparrot@ti.com>
> > ---
> > drivers/media/platform/am437x/am437x-vpfe.c | 54 ++++++++++-----------
> > 1 file changed, 26 insertions(+), 28 deletions(-)
> >
> > diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
> > index 3a8ad9bdf283..52f7fc6e11dd 100644
> > --- a/drivers/media/platform/am437x/am437x-vpfe.c
> > +++ b/drivers/media/platform/am437x/am437x-vpfe.c
> > @@ -1949,6 +1949,29 @@ static void vpfe_buffer_queue(struct vb2_buffer *vb)
> > spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
> > }
> >
> > +static void vpfe_return_all_buffers(struct vpfe_device *vpfe,
> > + enum vb2_buffer_state state)
> > +{
> > + struct vpfe_cap_buffer *buf, *node;
> > + unsigned long flags;
> > +
> > + spin_lock_irqsave(&vpfe->dma_queue_lock, flags);
> > + list_for_each_entry_safe(buf, node, &vpfe->dma_queue, list) {
> > + vb2_buffer_done(&buf->vb.vb2_buf, state);
> > + list_del(&buf->list);
> > + }
> > +
> > + if (vpfe->cur_frm)
> > + vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf, state);
> > +
> > + if (vpfe->next_frm && vpfe->next_frm != vpfe->cur_frm)
> > + vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf, state);
> > +
> > + vpfe->cur_frm = NULL;
> > + vpfe->next_frm = NULL;
> > + spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
> > +}
> > +
> > /*
> > * vpfe_start_streaming : Starts the DMA engine for streaming
> > * @vb: ptr to vb2_buffer
> > @@ -1957,7 +1980,6 @@ static void vpfe_buffer_queue(struct vb2_buffer *vb)
> > static int vpfe_start_streaming(struct vb2_queue *vq, unsigned int count)
> > {
> > struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
> > - struct vpfe_cap_buffer *buf, *tmp;
> > struct vpfe_subdev_info *sdinfo;
> > unsigned long flags;
> > unsigned long addr;
> > @@ -2003,11 +2025,8 @@ static int vpfe_start_streaming(struct vb2_queue *vq, unsigned int count)
> > return 0;
> >
> > err:
> > - list_for_each_entry_safe(buf, tmp, &vpfe->dma_queue, list) {
> > - list_del(&buf->list);
> > - vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
> > - }
> > -
> > + vpfe_return_all_buffers(vpfe, VB2_BUF_STATE_QUEUED);
> > + vpfe_pcr_enable(&vpfe->ccdc, 0);
>
> please create a seperate patch for the above change.

You mean a separate patch just for the vpfe_pcr_enable() call?

Benoit

>
> Cheers,
> --Prabhakar Lad
>
> > return ret;
> > }
> >
> > @@ -2022,7 +2041,6 @@ static void vpfe_stop_streaming(struct vb2_queue *vq)
> > {
> > struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
> > struct vpfe_subdev_info *sdinfo;
> > - unsigned long flags;
> > int ret;
> >
> > vpfe_pcr_enable(&vpfe->ccdc, 0);
> > @@ -2040,27 +2058,7 @@ static void vpfe_stop_streaming(struct vb2_queue *vq)
> > vpfe_dbg(1, vpfe, "stream off failed in subdev\n");
> >
> > /* release all active buffers */
> > - spin_lock_irqsave(&vpfe->dma_queue_lock, flags);
> > - if (vpfe->cur_frm == vpfe->next_frm) {
> > - vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf,
> > - VB2_BUF_STATE_ERROR);
> > - } else {
> > - if (vpfe->cur_frm != NULL)
> > - vb2_buffer_done(&vpfe->cur_frm->vb.vb2_buf,
> > - VB2_BUF_STATE_ERROR);
> > - if (vpfe->next_frm != NULL)
> > - vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf,
> > - VB2_BUF_STATE_ERROR);
> > - }
> > -
> > - while (!list_empty(&vpfe->dma_queue)) {
> > - vpfe->next_frm = list_entry(vpfe->dma_queue.next,
> > - struct vpfe_cap_buffer, list);
> > - list_del(&vpfe->next_frm->list);
> > - vb2_buffer_done(&vpfe->next_frm->vb.vb2_buf,
> > - VB2_BUF_STATE_ERROR);
> > - }
> > - spin_unlock_irqrestore(&vpfe->dma_queue_lock, flags);
> > + vpfe_return_all_buffers(vpfe, VB2_BUF_STATE_ERROR);
> > }
> >
> > static int vpfe_g_pixelaspect(struct file *file, void *priv,
> > --
> > 2.17.1
> >