> -----Original Message----- > From: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx> > Sent: 06 January 2023 03:15 PM > To: shravan Chippa - I35088 <Shravan.Chippa@xxxxxxxxxxxxx>; Hans Verkuil > <hverkuil@xxxxxxxxx> > Cc: paul.j.murphy@xxxxxxxxx; daniele.alessandrelli@xxxxxxxxx; > mchehab@xxxxxxxxxx; linux-media@xxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v8 1/4] media: i2c: imx334: replace __v4l2_ctrl_s_ctrl to > __v4l2_ctrl_modify_range > > [You don't often get email from jacopo.mondi@xxxxxxxxxxxxxxxx. Learn > why this is important at https://aka.ms/LearnAboutSenderIdentification ] > > EXTERNAL EMAIL: Do not click links or open attachments unless you know the > content is safe > > Hi Sharavan, > > I'm a bit confused here > > On Fri, Jan 06, 2023 at 12:59:28PM +0530, shravan kumar wrote: > > From: Shravan Chippa <shravan.chippa@xxxxxxxxxxxxx> > > > > For evry mode we will get new set of values for hbalnk so use > > __v4l2_ctrl_modify_range() to support multi modes for hblank. > > > > The hblank value is readonly in the driver. because of this the > > function returns error if we try to change. so added dumy return case > > in imx334_set_ctrl function > > > > Suggested-by: Jacopo Mondi <jacopo@xxxxxxxxxx> > > Signed-off-by: Shravan Chippa <shravan.chippa@xxxxxxxxxxxxx> > > --- > > drivers/media/i2c/imx334.c | 6 +++++- > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c > > index 7b0a9086447d..ebacba3059b3 100644 > > --- a/drivers/media/i2c/imx334.c > > +++ b/drivers/media/i2c/imx334.c > > @@ -382,7 +382,8 @@ static int imx334_update_controls(struct imx334 > *imx334, > > if (ret) > > return ret; > > > > - ret = __v4l2_ctrl_s_ctrl(imx334->hblank_ctrl, mode->hblank); > > + ret = __v4l2_ctrl_modify_range(imx334->hblank_ctrl, mode->hblank, > > + mode->hblank, 1, mode->hblank); > > if (ret) > > return ret; > > > > @@ -480,6 +481,9 @@ static int imx334_set_ctrl(struct v4l2_ctrl *ctrl) > > > > pm_runtime_put(imx334->dev); > > > > + break; > > + case V4L2_CID_HBLANK: > > + ret = 0; > > Hblank is said to be read-only Yes, read-only. > > if (imx334->hblank_ctrl) > imx334->hblank_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY; > > So you shouldn't need this safety measure here. > > However I see that __v4l2_ctrl_modify_range() can call s_ctrl() if the current > value has to be adjusted to the new limits. > > Hans, how does this work ? Do we need the above even if the control is said > to be RO ? > > Sharavan: have you experienced failures here, or is this just for safety ? The value is changing if we change the mode. While changing mode. I have experienced failures. Thanks, Shravan. > > > > break; > > default: > > dev_err(imx334->dev, "Invalid control %d", ctrl->id); > > -- > > 2.34.1 > >
