linux-kernel - 回复: [PATCH] staging: media: starfive: Add multiple resolution support

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Message-ID:
 <ZQ0PR01MB1302CAAE59FA0358E7FE6BD0F2BA2@ZQ0PR01MB1302.CHNPR01.prod.partner.outlook.cn>
Date: Fri, 9 Aug 2024 12:12:01 +0000
From: Changhuang Liang <changhuang.liang@...rfivetech.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC: Mauro Carvalho Chehab <mchehab@...nel.org>, Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>, Hans Verkuil <hverkuil-cisco@...all.nl>, Jack
 Zhu <jack.zhu@...rfivetech.com>, "linux-media@...r.kernel.org"
	<linux-media@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-staging@...ts.linux.dev"
	<linux-staging@...ts.linux.dev>
Subject:
 回复: [PATCH] staging: media: starfive: Add multiple resolution support

Hi, Laurent

Thanks for your comments.

> Hi Changhuang,
> 
> Thank you for the patch.
> 
> On Fri, Apr 19, 2024 at 01:19:55AM -0700, Changhuang Liang wrote:
> > Add multiple resolution support for video "capture_raw" device.
> > Otherwise it will capture the wrong image data if the width is not 1920.
> >
> > Fixes: e080f339c80a ("media: staging: media: starfive: camss: Add
> > capture driver")
> >
> > Signed-off-by: Changhuang Liang <changhuang.liang@...rfivetech.com>
> > ---
> >  drivers/staging/media/starfive/camss/stf-capture.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/media/starfive/camss/stf-capture.c
> > b/drivers/staging/media/starfive/camss/stf-capture.c
> > index ec5169e7b391..9e853ff2596a 100644
> > --- a/drivers/staging/media/starfive/camss/stf-capture.c
> > +++ b/drivers/staging/media/starfive/camss/stf-capture.c
> > @@ -177,9 +177,12 @@ static void stf_channel_set(struct stfcamss_video
> > *video)  {
> >  	struct stf_capture *cap = to_stf_capture(video);
> >  	struct stfcamss *stfcamss = cap->video.stfcamss;
> > +	struct v4l2_pix_format *pix;
> 
> This variable can be const as you don't modify the format.
> 
> >  	u32 val;
> >
> >  	if (cap->type == STF_CAPTURE_RAW) {
> > +		pix = &video->active_fmt.fmt.pix;
> 
> And it can be declared and initialized here:
> 
> 		const struct v4l2_pix_format *pix = &video->active_fmt.fmt.pix;
> 
> > +
> >  		val = stf_syscon_reg_read(stfcamss, VIN_CHANNEL_SEL_EN);
> >  		val &= ~U0_VIN_CHANNEL_SEL_MASK;
> >  		val |= CHANNEL(0);
> > @@ -193,7 +196,7 @@ static void stf_channel_set(struct stfcamss_video
> *video)
> >  		val |= PIXEL_HEIGH_BIT_SEL(0);
> >
> >  		val &= ~U0_VIN_PIX_CNT_END_MASK;
> > -		val |= PIX_CNT_END(IMAGE_MAX_WIDTH / 4 - 1);
> > +		val |= PIX_CNT_END(pix->width / 4 - 1);
> 
> Is there no need to consider the image height as well ? How does the driver
> prevent buffer overflows if the sensor sends more data than expected ?
> 

Our hardware will confirm a frame of data through vblank signal, so there is no image height configuration.

Ragards,
Changhuang

> >
> >  		stf_syscon_reg_write(stfcamss, VIN_INRT_PIX_CFG, val);
> >  	} else if (cap->type == STF_CAPTURE_YUV) {
> 
> --
> Regards,
> 
> Laurent Pinchart