linux-kernel - Re: (EXT) Re: [PATCH v2 3/9] media: imx: Use dedicated format handler for i.MX7/8

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Date:   Tue, 15 Feb 2022 08:29:34 +0100
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: (EXT) Re: [PATCH v2 3/9] media: imx: Use dedicated format handler for i.MX7/8

Hi Jacopo,

Am Montag, 14. Februar 2022, 19:51:15 CET schrieb Jacopo Mondi:
> Hello
> 
> On Fri, Feb 11, 2022 at 03:27:46PM +0100, Alexander Stein wrote:
> > From: Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
> > 
> > This splits out a format handler which takes into account
> > the capabilities of the i.MX7/8 video device,
> > as opposed to the default handler compatible with both i.MX5/6 and
> > i.MX7/8.
> > 
> > Signed-off-by: Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
> > Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> > ---
> > Changes in v2:
> > * Switch back to using enum
> > * Get rid of an additional call to v4l2_fill_pixfmt()
> > 
> >  drivers/staging/media/imx/imx-media-utils.c | 60 +++++++++++++++++++--
> >  1 file changed, 56 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/staging/media/imx/imx-media-utils.c
> > b/drivers/staging/media/imx/imx-media-utils.c index
> > c42f3da8e3a8..02a4cb124d37 100644
> > --- a/drivers/staging/media/imx/imx-media-utils.c
> > +++ b/drivers/staging/media/imx/imx-media-utils.c
> > @@ -516,10 +516,9 @@ void imx_media_try_colorimetry(struct
> > v4l2_mbus_framefmt *tryfmt,> 
> >  }
> >  EXPORT_SYMBOL_GPL(imx_media_try_colorimetry);
> > 
> > -int imx_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> > -				  const struct v4l2_mbus_framefmt 
*mbus,
> > -				  const struct imx_media_pixfmt 
*cc,
> > -				  enum imx_media_device_type type)
> > +static int imx56_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> > +					   const struct 
v4l2_mbus_framefmt *mbus,
> > +					   const struct 
imx_media_pixfmt *cc)
> > 
> >  {
> >  
> >  	u32 width;
> >  	u32 stride;
> > 
> > @@ -568,6 +567,59 @@ int imx_media_mbus_fmt_to_pix_fmt(struct
> > v4l2_pix_format *pix,> 
> >  	return 0;
> >  
> >  }
> > 
> > +
> > +static int imx78_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> > +					   const struct 
v4l2_mbus_framefmt *mbus,
> > +					   const struct 
imx_media_pixfmt *cc)
> > +{
> > +	u32 aligned_width;
> > +	int ret;
> > +
> > +	if (!cc)
> > +		cc = imx_media_find_mbus_format(mbus->code, 
PIXFMT_SEL_ANY);
> > +
> > +	if (!cc)
> > +		return -EINVAL;
> > +	/*
> > +	 * The hardware can handle line lengths divisible by 4 pixels
> > +	 * as long as the whole buffer size ends up divisible by 8 bytes.
> > +	 * If not, use the value of 8 pixels recommended in the datasheet.
> > +	 * Only 8bits-per-pixel formats may need to get aligned to 8 
pixels,
> > +	 * because both 10-bit and 16-bit pixels occupy 2 bytes.
> > +	 * In those, 4-pixel aligmnent is equal to 8-byte alignment.
> > +	 */
> > +	if (cc->bpp == 1)
> 
> Am I mistaken or in the format enumeration bpp is expressed in bits
> and not bytes ?

No, you are completely right. Thanks for find noticing that.

Regards,
Alexander

> > +		aligned_width = round_up(mbus->width, 8);
> > +	else
> > +		aligned_width = round_up(mbus->width, 4);
> > +
> > +	ret = v4l2_fill_pixfmt(pix, cc->fourcc,
> > +			       aligned_width, mbus->height);
> > +	if (ret)
> > +		return ret;
> > +
> > +	pix->colorspace = mbus->colorspace;
> > +	pix->xfer_func = mbus->xfer_func;
> > +	pix->ycbcr_enc = mbus->ycbcr_enc;
> > +	pix->quantization = mbus->quantization;
> > +	pix->field = mbus->field;
> > +
> > +	return ret;
> > +}
> > +
> > +int imx_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> > +				  const struct v4l2_mbus_framefmt 
*mbus,
> > +				  const struct imx_media_pixfmt 
*cc,
> > +				  enum imx_media_device_type type)
> > +{
> > +	switch (type) {
> > +	case DEVICE_TYPE_IMX56:
> > +		return imx56_media_mbus_fmt_to_pix_fmt(pix, mbus, cc);
> > +	case DEVICE_TYPE_IMX78:
> > +		return imx78_media_mbus_fmt_to_pix_fmt(pix, mbus, cc);
> > +	}
> > +	return -EINVAL;
> > +}
> > 
> >  EXPORT_SYMBOL_GPL(imx_media_mbus_fmt_to_pix_fmt);
> >  
> >  void imx_media_free_dma_buf(struct device *dev,
> > 
> > --
> > 2.25.1