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SubjectRe: [PATCH v5 02/10] [media] marvell-ccic: fix DMA s/g desc number calculation
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On Fri, 2019-06-14 at 11:41 +0200, Jacopo Mondi wrote:
> Hi Lubomir,
>
> On Sun, May 05, 2019 at 04:00:23PM +0200, Lubomir Rintel wrote:
> > The commit d790b7eda953 ("[media] vb2-dma-sg: move dma_(un)map_sg here")
> > left dma_desc_nent unset. It previously contained the number of DMA
> > descriptors as returned from dma_map_sg().
> >
> > We can now (since the commit referred to above) obtain the same value from
> > the sg_table and drop dma_desc_nent altogether.
> >
> > Tested on OLPC XO-1.75 machine. Doesn't affect the OLPC XO-1's Cafe
> > driver, since that one doesn't do DMA.
> >
> > Fixes: d790b7eda953df474f470169ebdf111c02fa7a2d
>
> Could you use the proper 'fixes' format here?
> Fixes: d790b7eda953 ("[media] vb2-dma-sg: move dma_(un)map_sg here")
>
> > Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> > ---
> > drivers/media/platform/marvell-ccic/mcam-core.c | 5 +++--
> > 1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c b/drivers/media/platform/marvell-ccic/mcam-core.c
> > index f1b301810260a..d97f39bde9bd6 100644
> > --- a/drivers/media/platform/marvell-ccic/mcam-core.c
> > +++ b/drivers/media/platform/marvell-ccic/mcam-core.c
> > @@ -200,7 +200,6 @@ struct mcam_vb_buffer {
> > struct list_head queue;
> > struct mcam_dma_desc *dma_desc; /* Descriptor virtual address */
> > dma_addr_t dma_desc_pa; /* Descriptor physical address */
> > - int dma_desc_nent; /* Number of mapped descriptors */
> > };
> >
> > static inline struct mcam_vb_buffer *vb_to_mvb(struct vb2_v4l2_buffer *vb)
> > @@ -608,9 +607,11 @@ static void mcam_dma_contig_done(struct mcam_camera *cam, int frame)
> > static void mcam_sg_next_buffer(struct mcam_camera *cam)
> > {
> > struct mcam_vb_buffer *buf;
> > + struct sg_table *sg_table;
> >
> > buf = list_first_entry(&cam->buffers, struct mcam_vb_buffer, queue);
> > list_del_init(&buf->queue);
> > + sg_table = vb2_dma_sg_plane_desc(&buf->vb_buf.vb2_buf, 0);
> > /*
> > * Very Bad Not Good Things happen if you don't clear
> > * C1_DESC_ENA before making any descriptor changes.
> > @@ -618,7 +619,7 @@ static void mcam_sg_next_buffer(struct mcam_camera *cam)
> > mcam_reg_clear_bit(cam, REG_CTRL1, C1_DESC_ENA);
> > mcam_reg_write(cam, REG_DMA_DESC_Y, buf->dma_desc_pa);
> > mcam_reg_write(cam, REG_DESC_LEN_Y,
> > - buf->dma_desc_nent*sizeof(struct mcam_dma_desc));
> > + sg_table->nents*sizeof(struct mcam_dma_desc));
>
> Space betwen operators (it was there already, I know).
>
> Apart for that, patch seems fine to me:
> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

This has been already applied to media_tree.git, with the Fixes: tag
corrected by Mauro Chehab.

I suppose I can't make changes anymore and the space-between-operators
things is not worth fixing up in a separate commit?

> Thanks
> j
> > mcam_reg_write(cam, REG_DESC_LEN_U, 0);
> > mcam_reg_write(cam, REG_DESC_LEN_V, 0);
> > mcam_reg_set_bit(cam, REG_CTRL1, C1_DESC_ENA);
> >

Thank you
Lubo

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