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Message-ID: <20231218025430.GA9012@pendragon.ideasonboard.com>
Date: Mon, 18 Dec 2023 04:54:30 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Tommaso Merciai <tomm.merciai@...il.com>
Cc: linuxfancy@...glegroups.com, sakari.ailus@...ux.intel.com,
Martin Hecht <martin.hecht@...et.eu>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] media: i2c: alvium: removal of dft_fr, min_fr and
max_fr
On Mon, Dec 18, 2023 at 04:50:46AM +0200, Laurent Pinchart wrote:
> Hi Tommaso,
>
> Thank you for the patch.
>
> On Fri, Dec 15, 2023 at 09:24:50AM +0100, Tommaso Merciai wrote:
> > Remove driver private data dft_fr, min_fr and max_fr.
> > Those are used only in alvium_set_frame_interval function.
> > Use local ones instead.
>
> The fields are used to pass data from alvium_get_frame_interval() to its
> caller, not just in alvium_get_frame_interval(). You can write
>
> The dft_fr, min_fr and max_fr fields of the alvium_dev structure are
> only used to pass results from alvium_get_frame_interval() to its
> caller. Replace them with function parameters.
>
> > Signed-off-by: Tommaso Merciai <tomm.merciai@...il.com>
> > ---
> > drivers/media/i2c/alvium-csi2.c | 45 +++++++++++++++------------------
> > drivers/media/i2c/alvium-csi2.h | 3 ---
> > 2 files changed, 21 insertions(+), 27 deletions(-)
> >
> > diff --git a/drivers/media/i2c/alvium-csi2.c b/drivers/media/i2c/alvium-csi2.c
> > index 34ff7fad3877..c4b7851045a1 100644
> > --- a/drivers/media/i2c/alvium-csi2.c
> > +++ b/drivers/media/i2c/alvium-csi2.c
> > @@ -1170,40 +1170,36 @@ static int alvium_set_bayer_pattern(struct alvium_dev *alvium,
> > return 0;
> > }
> >
> > -static int alvium_get_frame_interval(struct alvium_dev *alvium)
> > +static int alvium_get_frame_interval(struct alvium_dev *alvium,
> > + u64 *dft_fr, u64 *min_fr, u64 *max_fr)
> > {
> > - u64 dft_fr, min_fr, max_fr;
> > int ret = 0;
> >
> > alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_RW,
> > - &dft_fr, &ret);
> > + dft_fr, &ret);
> > alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MIN_R,
> > - &min_fr, &ret);
> > + min_fr, &ret);
> > alvium_read(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_MAX_R,
> > - &max_fr, &ret);
> > + max_fr, &ret);
> > if (ret)
> > return ret;
>
> You can just
>
> return ret;
>
> >
> > - alvium->dft_fr = dft_fr;
> > - alvium->min_fr = min_fr;
> > - alvium->max_fr = max_fr;
> > -
> > return 0;
> > }
> >
> > -static int alvium_set_frame_rate(struct alvium_dev *alvium)
> > +static int alvium_set_frame_rate(struct alvium_dev *alvium, u64 fr)
> > {
> > struct device *dev = &alvium->i2c_client->dev;
> > int ret;
> >
> > ret = alvium_write_hshake(alvium, REG_BCRM_ACQUISITION_FRAME_RATE_RW,
> > - alvium->fr);
> > + fr);
>
> This is unrelated to the commit message. Please split handling of the fr
> field to a separate patch. One change, one patch.
>
> > if (ret) {
> > dev_err(dev, "Fail to set frame rate lanes reg\n");
> > return ret;
> > }
> >
> > - dev_dbg(dev, "set frame rate: %llu us\n", alvium->fr);
> > + dev_dbg(dev, "set frame rate: %llu us\n", fr);
> >
> > return 0;
> > }
> > @@ -1667,36 +1663,36 @@ static int alvium_g_frame_interval(struct v4l2_subdev *sd,
> > }
> >
> > static int alvium_set_frame_interval(struct alvium_dev *alvium,
> > - struct v4l2_subdev_frame_interval *fi)
> > + struct v4l2_subdev *sd,
> > + struct v4l2_subdev_state *sd_state,
This is also unrelated to this patch.
> > + struct v4l2_subdev_frame_interval *fi,
> > + u64 *req_fr)
> > {
> > struct device *dev = &alvium->i2c_client->dev;
> > - u64 req_fr, min_fr, max_fr;
> > + u64 dft_fr, min_fr, max_fr;
> > int ret;
> >
> > if (fi->interval.denominator == 0)
> > return -EINVAL;
> >
> > - ret = alvium_get_frame_interval(alvium);
> > + ret = alvium_get_frame_interval(alvium, &dft_fr, &min_fr, &max_fr);
> > if (ret) {
> > dev_err(dev, "Fail to get frame interval\n");
> > return ret;
> > }
> >
> > - min_fr = alvium->min_fr;
> > - max_fr = alvium->max_fr;
> > -
> > dev_dbg(dev, "fi->interval.numerator = %d\n",
> > fi->interval.numerator);
> > dev_dbg(dev, "fi->interval.denominator = %d\n",
> > fi->interval.denominator);
> >
> > - req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
> > + *req_fr = (u64)((fi->interval.denominator * USEC_PER_SEC) /
> > fi->interval.numerator);
> >
> > - if (req_fr >= max_fr && req_fr <= min_fr)
> > - req_fr = alvium->dft_fr;
> > + if (*req_fr >= max_fr && *req_fr <= min_fr)
> > + *req_fr = dft_fr;
> >
> > - alvium->fr = req_fr;
> > + alvium->fr = *req_fr;
> > alvium->frame_interval.numerator = fi->interval.numerator;
> > alvium->frame_interval.denominator = fi->interval.denominator;
> >
> > @@ -1708,6 +1704,7 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
> > struct v4l2_subdev_frame_interval *fi)
> > {
> > struct alvium_dev *alvium = sd_to_alvium(sd);
> > + u64 req_fr;
> > int ret;
> >
> > /*
> > @@ -1720,9 +1717,9 @@ static int alvium_s_frame_interval(struct v4l2_subdev *sd,
> > if (alvium->streaming)
> > return -EBUSY;
> >
> > - ret = alvium_set_frame_interval(alvium, fi);
> > + ret = alvium_set_frame_interval(alvium, sd, sd_state, fi, &req_fr);
> > if (!ret)
> > - ret = alvium_set_frame_rate(alvium);
> > + ret = alvium_set_frame_rate(alvium, req_fr);
> >
> > return ret;
> > }
> > diff --git a/drivers/media/i2c/alvium-csi2.h b/drivers/media/i2c/alvium-csi2.h
> > index 8b554bffdc39..a6529b28e7dd 100644
> > --- a/drivers/media/i2c/alvium-csi2.h
> > +++ b/drivers/media/i2c/alvium-csi2.h
> > @@ -443,9 +443,6 @@ struct alvium_dev {
> >
> > struct alvium_mode mode;
> > struct v4l2_fract frame_interval;
> > - u64 dft_fr;
> > - u64 min_fr;
> > - u64 max_fr;
> > u64 fr;
> >
> > u8 h_sup_csi_lanes;
--
Regards,
Laurent Pinchart
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