linux-kernel - Re: [PATCH 04/14] media: sun6i-csi: Fix the image storage bpp for 10/12-bit Bayer formats

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Message-ID: <20201104105619.GG285779@aptenodytes>
Date:   Wed, 4 Nov 2020 11:56:19 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Helen Koike <helen.koike@...labora.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-sunxi@...glegroups.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Yong Deng <yong.deng@...ewell.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Hans Verkuil <hverkuil@...all.nl>, kevin.lhopital@...mail.com,
        Kévin L'hôpital <kevin.lhopital@...tlin.com>
Subject: Re: [PATCH 04/14] media: sun6i-csi: Fix the image storage bpp for
 10/12-bit Bayer formats

Hi Helen,

On Fri 30 Oct 20, 19:45, Helen Koike wrote:
> Hi Paul,
> 
> On 10/23/20 2:45 PM, Paul Kocialkowski wrote:
> > Both 10 and 12-bit Bayer formats are stored aligned as 16-bit values
> > in memory, not unaligned 10 or 12 bits.
> > 
> > Since the current code for retreiving the bpp is used only to
> > calculate the memory storage size of the picture (which is what
> > pixel formats describe, unlike media bus formats), fix it there.
> > 
> > Fixes: 5cc7522d8965 ("media: sun6i: Add support for Allwinner CSI V3s")
> > Co-developed-by: Kévin L'hôpital <kevin.lhopital@...tlin.com>
> > Signed-off-by: Kévin L'hôpital <kevin.lhopital@...tlin.com>
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > ---
> >  .../platform/sunxi/sun6i-csi/sun6i_csi.h      | 20 +++++++++----------
> >  1 file changed, 10 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> > index c626821aaedb..7f2be70ae641 100644
> > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.h
> > @@ -86,7 +86,7 @@ void sun6i_csi_update_buf_addr(struct sun6i_csi *csi, dma_addr_t addr);
> >   */
> >  void sun6i_csi_set_stream(struct sun6i_csi *csi, bool enable);
> >  
> > -/* get bpp form v4l2 pixformat */
> > +/* get memory storage bpp from v4l2 pixformat */
> >  static inline int sun6i_csi_get_bpp(unsigned int pixformat)
> >  {
> >  	switch (pixformat) {
> > @@ -96,15 +96,6 @@ static inline int sun6i_csi_get_bpp(unsigned int pixformat)
> >  	case V4L2_PIX_FMT_SRGGB8:
> >  	case V4L2_PIX_FMT_JPEG:
> >  		return 8;
> > -	case V4L2_PIX_FMT_SBGGR10:
> > -	case V4L2_PIX_FMT_SGBRG10:
> > -	case V4L2_PIX_FMT_SGRBG10:
> > -	case V4L2_PIX_FMT_SRGGB10:
> > -		return 10;
> > -	case V4L2_PIX_FMT_SBGGR12:
> > -	case V4L2_PIX_FMT_SGBRG12:
> > -	case V4L2_PIX_FMT_SGRBG12:
> > -	case V4L2_PIX_FMT_SRGGB12:
> >  	case V4L2_PIX_FMT_HM12:
> >  	case V4L2_PIX_FMT_NV12:
> >  	case V4L2_PIX_FMT_NV21:
> > @@ -121,6 +112,15 @@ static inline int sun6i_csi_get_bpp(unsigned int pixformat)
> >  	case V4L2_PIX_FMT_RGB565:
> >  	case V4L2_PIX_FMT_RGB565X:
> >  		return 16;
> > +	case V4L2_PIX_FMT_SBGGR10:
> > +	case V4L2_PIX_FMT_SGBRG10:
> > +	case V4L2_PIX_FMT_SGRBG10:
> > +	case V4L2_PIX_FMT_SRGGB10:
> > +	case V4L2_PIX_FMT_SBGGR12:
> > +	case V4L2_PIX_FMT_SGBRG12:
> > +	case V4L2_PIX_FMT_SGRBG12:
> > +	case V4L2_PIX_FMT_SRGGB12:
> > +		return 16;
> >  	case V4L2_PIX_FMT_RGB24:
> >  	case V4L2_PIX_FMT_BGR24:
> >  		return 24;
> > 
> 
> Instead of updating this table, how about using v4l2_format_info() instead?

Yes that would be a very good thing to do indeed!

Thanks,

Paul

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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