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

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Message-ID: <CA+V-a8t0ukJ9zkz1yLaReQzMBpcN4o1182ao4OQSyCgEu3M_VQ@mail.gmail.com>
Date:   Mon, 16 Sep 2019 17:02:16 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Benoit Parrot <bparrot@...com>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        linux-media <linux-media@...r.kernel.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Patch 05/13] media: am437x-vpfe: Streamlined vb2 buffer cleanup

On Mon, Sep 16, 2019 at 3:51 PM Benoit Parrot <bparrot@...com> wrote:
>
> Lad, Prabhakar <prabhakar.csengg@...il.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@...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@...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?
>
yes, as the call to vpfe_pcr_enable() is to disable the CCDC and it
doesn't match the patch
description.

Cheers,
--Prabhakar Lad