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Message-ID: <ZW2cMPpbDN8xrOM9@kekkonen.localdomain>
Date: Mon, 4 Dec 2023 09:30:24 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Tommaso Merciai <tomm.merciai@...il.com>
Cc: laurent.pinchart@...asonboard.com, martin.hecht@...et.eu,
michael.roeder@...et.eu, linuxfancy@...glegroups.com,
mhecht73@...il.com, christophe.jaillet@...adoo.fr,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Hans de Goede <hdegoede@...hat.com>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Gerald Loacker <gerald.loacker@...fvision.net>,
Nicholas Roth <nicholas@...hemail.net>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Daniel Scally <djrscally@...il.com>,
Bingbu Cao <bingbu.cao@...el.com>,
Linus Walleij <linus.walleij@...aro.org>,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH v14 3/3] media: i2c: Add support for alvium camera
Hi Tommaso,
On Sat, Dec 02, 2023 at 10:32:11AM +0100, Tommaso Merciai wrote:
> Hi Sakari,
> Thanks for your comments.
>
> On Fri, Dec 01, 2023 at 09:00:33PM +0000, Sakari Ailus wrote:
> > Hi Tommaso,
> >
> > A few more comments below...
> >
> > On Fri, Nov 24, 2023 at 10:30:07AM +0100, Tommaso Merciai wrote:
> >
> > ...
> >
> > > +static int alvium_get_bcrm_vers(struct alvium_dev *alvium)
> > > +{
> > > + struct device *dev = &alvium->i2c_client->dev;
> > > + struct alvium_bcrm_vers *v;
> > > + u64 val;
> > > + int ret;
> > > +
> > > + ret = alvium_read(alvium, REG_BCRM_VERSION_R, &val, NULL);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + v = (struct alvium_bcrm_vers *)&val;
> >
> > You're still reading the entire struct using a single read. :-( This won't
> > work on a BE machine as while the struct fields are in the same memory
> > locations, the respective data in a single 64-bit value is not.
>
> What about splitting REG_BCRM_VERSION_R in:
>
> #define REG_BCRM_MINOR_VERSION_R CCI_REG16(0x0000)
> #define REG_BCRM_MAJOR_VERSION_R CCI_REG16(0x0002)
>
> and REG_BCRM_DEVICE_FIRMWARE_VERSION_R in:
>
> #define REG_BCRM_DEVICE_FW_SPEC_VERSION_R REG_BCRM_V4L2_8BIT(0x0010)
> #define REG_BCRM_DEVICE_FW_MAJOR_VERSION_R REG_BCRM_V4L2_8BIT(0x0011)
> #define REG_BCRM_DEVICE_FW_MINOR_VERSION_R REG_BCRM_V4L2_16BIT(0x0012)
> #define REG_BCRM_DEVICE_FW_PATCH_VERSION_R REG_BCRM_V4L2_32BIT(0x0014)
>
>
> Then reading those values as a single values as you suggest:
>
> static int alvium_get_bcrm_vers(struct alvium_dev *alvium)
> {
> struct device *dev = &alvium->i2c_client->dev;
> u64 min, maj;
> int ret = 0;
>
> ret = alvium_read(alvium, REG_BCRM_MINOR_VERSION_R, &min, &ret);
> ret = alvium_read(alvium, REG_BCRM_MAJOR_VERSION_R, &maj, &ret);
> if (ret)
> return ret;
>
> dev_info(dev, "bcrm version: %llu.%llu\n", min, maj);
>
> return 0;
> }
>
> static int alvium_get_fw_version(struct alvium_dev *alvium)
> {
> struct device *dev = &alvium->i2c_client->dev;
> u64 spec, maj, min, pat;
> int ret = 0;
>
> ret = alvium_read(alvium, REG_BCRM_DEVICE_FW_SPEC_VERSION_R, &spec, &ret);
> ret = alvium_read(alvium, REG_BCRM_DEVICE_FW_MAJOR_VERSION_R, &maj, &ret);
> ret = alvium_read(alvium, REG_BCRM_DEVICE_FW_MINOR_VERSION_R, &min, &ret);
> ret = alvium_read(alvium, REG_BCRM_DEVICE_FW_PATCH_VERSION_R, &pat, &ret);
> if (ret)
> return ret;
>
> dev_info(dev, "fw version: %llu.%llu.%llu.%llu\n", spec, maj, min, pat);
>
> return 0;
> }
>
> Then I'm going to remove alvium_bcrm_vers and alvium_fw_vers.
> And alvium_is_alive became:
>
> static int alvium_is_alive(struct alvium_dev *alvium)
> {
> u64 bcrm, hbeat;
> int ret = 0;
>
> alvium_read(alvium, REG_BCRM_MINOR_VERSION_R, &bcrm, &ret);
> alvium_read(alvium, REG_BCRM_HEARTBEAT_RW, &hbeat, &ret);
> if (ret)
> return ret;
>
> return hbeat;
> }
>
> What do you think? Let me know.
> (Maybe is this that you are trying to explain me but I haven't catch,
> sorry) :)
Yes. The above code looks good to me.
>
>
> >
> > > +
> > > + dev_info(dev, "bcrm version: %u.%u\n", v->minor, v->major);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int alvium_get_fw_version(struct alvium_dev *alvium)
> > > +{
> > > + struct device *dev = &alvium->i2c_client->dev;
> > > + struct alvium_fw_vers *fw_v;
> > > + u64 val;
> > > + int ret;
> > > +
> > > + ret = alvium_read(alvium, REG_BCRM_DEVICE_FIRMWARE_VERSION_R, &val, NULL);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + fw_v = (struct alvium_fw_vers *)&val;
> >
> > Same here.
> >
> > > +
> > > + dev_info(dev, "fw version: %u.%u.%u.%u\n", fw_v->special, fw_v->major,
> > > + fw_v->minor, fw_v->patch);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int alvium_get_bcrm_addr(struct alvium_dev *alvium)
> > > +{
> > > + u64 val;
> > > + int ret;
> > > +
> > > + ret = alvium_read(alvium, REG_BCRM_REG_ADDR_R, &val, NULL);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + alvium->bcrm_addr = val;
> > > +
> > > + return 0;
> > > +}
> >
> > ...
> >
> > > +static int alvium_setup_mipi_fmt(struct alvium_dev *alvium)
> > > +{
> > > + unsigned int avail_fmt_cnt = 0;
> > > + unsigned int fmt = 0;
> > > + size_t sz = 0;
> > > +
> > > + alvium->alvium_csi2_fmt = NULL;
> >
> > This seems to be unnnecessary: the field is assigned below without using it
> > (obviously).
>
> Ok, I will remove this in v15.
>
> >
> > > +
> > > + /* calculate fmt array size */
> > > + for (fmt = 0; fmt < ALVIUM_NUM_SUPP_MIPI_DATA_FMT; fmt++) {
> > > + if (!alvium->is_mipi_fmt_avail[alvium_csi2_fmts[fmt].fmt_av_bit])
> > > + continue;
> > > +
> > > + if ((!alvium_csi2_fmts[fmt].is_raw) ||
> > > + (alvium->is_bay_avail[alvium_csi2_fmts[fmt].bay_av_bit]))
> > > + sz++;
> > > + }
> > > +
> > > + /* init alvium_csi2_fmt array */
> > > + alvium->alvium_csi2_fmt_n = sz;
> > > + alvium->alvium_csi2_fmt =
> > > + kmalloc_array(sz, sizeof(struct alvium_pixfmt), GFP_KERNEL);
> > > + if (!alvium->alvium_csi2_fmt)
> > > + return -ENOMEM;
> > > +
> > > + /* Create the alvium_csi2 fmt array from formats available */
> > > + for (fmt = 0; fmt < ALVIUM_NUM_SUPP_MIPI_DATA_FMT; fmt++) {
> > > + if (!alvium->is_mipi_fmt_avail[alvium_csi2_fmts[fmt].fmt_av_bit])
> > > + continue;
> > > +
> > > + if ((!alvium_csi2_fmts[fmt].is_raw) ||
> > > + (alvium->is_bay_avail[alvium_csi2_fmts[fmt].bay_av_bit])) {
> > > + alvium->alvium_csi2_fmt[avail_fmt_cnt] = alvium_csi2_fmts[fmt];
> > > + avail_fmt_cnt++;
> > > + }
> > > + }
> > > +
> > > + return 0;
> > > +}
> >
> > ...
> >
> > > +static const struct alvium_pixfmt *
> > > +alvium_code_to_pixfmt(struct alvium_dev *alvium, u32 code)
> > > +{
> > > + const struct alvium_pixfmt *formats = alvium->alvium_csi2_fmt;
> >
> > I'd use alvium->alvium_csi2_fmt and not add a local variable. Up to you.
>
> Ok also for me.
>
> >
> > > + unsigned int i;
> > > +
> > > + for (i = 0; formats[i].code; ++i)
> > > + if (formats[i].code == code)
> > > + return &formats[i];
> > > +
> > > + return &formats[0];
> > > +}
> > > +
> > > +static int alvium_set_mode(struct alvium_dev *alvium,
> > > + struct v4l2_subdev_state *state)
> > > +{
> > > + struct v4l2_mbus_framefmt *fmt;
> > > + struct v4l2_rect *crop;
> > > + int ret;
> > > +
> > > + crop = v4l2_subdev_state_get_crop(state, 0);
> > > + fmt = v4l2_subdev_state_get_format(state, 0);
> > > +
> > > + v4l_bound_align_image(&fmt->width, alvium->img_min_width,
> > > + alvium->img_max_width, 0,
> > > + &fmt->height, alvium->img_min_height,
> > > + alvium->img_max_height, 0, 0);
> > > +
> > > + /* alvium don't accept negative crop left/top */
> > > + crop->left = clamp((u32)max(0, crop->left), alvium->min_offx,
> > > + (u32)(alvium->img_max_width - fmt->width));
> > > + crop->top = clamp((u32)max(0, crop->top), alvium->min_offy,
> > > + (u32)(alvium->img_max_height - fmt->height));
> > > +
> > > + ret = alvium_set_img_width(alvium, fmt->width);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = alvium_set_img_height(alvium, fmt->height);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = alvium_set_img_offx(alvium, crop->left);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = alvium_set_img_offy(alvium, crop->top);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + return 0;
> > > +}
>
> I'm going to rebase v15 on top of your master branch.
> My plan is moving alvium_init_cfg now alvium_init_state into
> v4l2_subdev_internal_ops.
Ack, thanks!
--
Regards,
Sakari Ailus
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