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Date: Tue, 10 Mar 2020 11:15:19 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Dave Stevenson <dave.stevenson@...pberrypi.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media <linux-media@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2 2/3] media: i2c: imx219: Add support for RAW8 bit bayer format
Hi Sakari,
Thank you for the review.
On Tue, Mar 10, 2020 at 10:01 AM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Prabhakar,
>
> On Fri, Mar 06, 2020 at 10:32:45AM +0000, Lad Prabhakar wrote:
> > IMX219 sensor is capable for RAW8/RAW10 modes. This commit adds support
> > for RAW8 bayer format.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> > ---
> > drivers/media/i2c/imx219.c | 161 +++++++++++++++++++++++++++++--------
> > 1 file changed, 127 insertions(+), 34 deletions(-)
> >
> > diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
> > index 16010ca1781a..f96f3ce9fd85 100644
> > --- a/drivers/media/i2c/imx219.c
> > +++ b/drivers/media/i2c/imx219.c
> > @@ -90,6 +90,11 @@
> >
> > #define IMX219_REG_ORIENTATION 0x0172
> >
> > +#define IMX219_CSI_DATA_FORMAT_A_0_7 0x018c
> > +#define IMX219_CSI_DATA_FORMAT_A_8_15 0x018d
> > +
> > +#define IMX219_OPPXCK_DIV 0x0309
> > +
> > /* Test Pattern Control */
> > #define IMX219_REG_TEST_PATTERN 0x0600
> > #define IMX219_TEST_PATTERN_DISABLE 0
> > @@ -168,15 +173,12 @@ static const struct imx219_reg mode_3280x2464_regs[] = {
> > {0x0171, 0x01},
> > {0x0174, 0x00},
> > {0x0175, 0x00},
> > - {0x018c, 0x0a},
> > - {0x018d, 0x0a},
> > {0x0301, 0x05},
> > {0x0303, 0x01},
> > {0x0304, 0x03},
> > {0x0305, 0x03},
> > {0x0306, 0x00},
> > {0x0307, 0x39},
> > - {0x0309, 0x0a},
> > {0x030b, 0x01},
> > {0x030c, 0x00},
> > {0x030d, 0x72},
> > @@ -230,15 +232,12 @@ static const struct imx219_reg mode_1920_1080_regs[] = {
> > {0x0171, 0x01},
> > {0x0174, 0x00},
> > {0x0175, 0x00},
> > - {0x018c, 0x0a},
> > - {0x018d, 0x0a},
> > {0x0301, 0x05},
> > {0x0303, 0x01},
> > {0x0304, 0x03},
> > {0x0305, 0x03},
> > {0x0306, 0x00},
> > {0x0307, 0x39},
> > - {0x0309, 0x0a},
> > {0x030b, 0x01},
> > {0x030c, 0x00},
> > {0x030d, 0x72},
> > @@ -290,15 +289,12 @@ static const struct imx219_reg mode_1640_1232_regs[] = {
> > {0x0171, 0x01},
> > {0x0174, 0x01},
> > {0x0175, 0x01},
> > - {0x018c, 0x0a},
> > - {0x018d, 0x0a},
> > {0x0301, 0x05},
> > {0x0303, 0x01},
> > {0x0304, 0x03},
> > {0x0305, 0x03},
> > {0x0306, 0x00},
> > {0x0307, 0x39},
> > - {0x0309, 0x0a},
> > {0x030b, 0x01},
> > {0x030c, 0x00},
> > {0x030d, 0x72},
> > @@ -348,6 +344,27 @@ static const char * const imx219_supply_name[] = {
> >
> > #define IMX219_NUM_SUPPLIES ARRAY_SIZE(imx219_supply_name)
> >
> > +/*
> > + * The supported formats.
> > + * This table MUST contain 4 entries per format, to cover the various flip
> > + * combinations in the order
> > + * - no flip
> > + * - h flip
> > + * - v flip
> > + * - h&v flips
> > + */
> > +static const u32 codes[] = {
> > + MEDIA_BUS_FMT_SRGGB10_1X10,
> > + MEDIA_BUS_FMT_SGRBG10_1X10,
> > + MEDIA_BUS_FMT_SGBRG10_1X10,
> > + MEDIA_BUS_FMT_SBGGR10_1X10,
> > +
> > + MEDIA_BUS_FMT_SRGGB8_1X8,
> > + MEDIA_BUS_FMT_SGRBG8_1X8,
> > + MEDIA_BUS_FMT_SGBRG8_1X8,
> > + MEDIA_BUS_FMT_SBGGR8_1X8,
> > +};
> > +
> > /*
> > * Initialisation delay between XCLR low->high and the moment when the sensor
> > * can start capture (i.e. can leave software stanby) must be not less than:
> > @@ -413,6 +430,8 @@ struct imx219 {
> > struct v4l2_subdev sd;
> > struct media_pad pad;
> >
> > + struct v4l2_mbus_framefmt fmt;
> > +
> > struct clk *xclk; /* system clock to IMX219 */
> > u32 xclk_freq;
> >
> > @@ -519,34 +538,57 @@ static int imx219_write_regs(struct imx219 *imx219,
> > }
> >
> > /* Get bayer order based on flip setting. */
> > -static u32 imx219_get_format_code(struct imx219 *imx219)
> > +static u32 imx219_get_format_code(struct imx219 *imx219, u32 code)
> > {
> > - /*
> > - * Only one bayer order is supported.
> > - * It depends on the flip settings.
> > - */
> > - static const u32 codes[2][2] = {
> > - { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10, },
> > - { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10, },
> > - };
> > + int i;
>
> unsigned int
>
sure will change it.
> >
> > lockdep_assert_held(&imx219->mutex);
> > - return codes[imx219->vflip->val][imx219->hflip->val];
> > +
> > + for (i = 0; i < ARRAY_SIZE(codes); i++)
> > + if (codes[i] == code)
> > + break;
> > +
> > + if (i >= ARRAY_SIZE(codes))
> > + i = 0;
> > +
> > + i = (i & ~3) | (imx219->vflip->val ? 2 : 0) |
> > + (imx219->hflip->val ? 1 : 0);
> > +
> > + return codes[i];
> > +}
> > +
> > +static void imx219_set_default_format(struct imx219 *imx219)
> > +{
> > + struct v4l2_mbus_framefmt *fmt;
> > +
> > + mutex_lock(&imx219->mutex);
>
> No mutex needed; all this information is static, and you're calling the
> function from probe before any driver's external APIs are accessible.
>
Agreed will drop the mutex.
> > +
> > + fmt = &imx219->fmt;
> > + fmt->code = MEDIA_BUS_FMT_SRGGB10_1X10;
> > + fmt->colorspace = V4L2_COLORSPACE_SRGB;
> > + fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
> > + fmt->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true,
> > + fmt->colorspace,
> > + fmt->ycbcr_enc);
> > + fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);
> > + fmt->width = supported_modes[0].width;
> > + fmt->height = supported_modes[0].height;
> > + fmt->field = V4L2_FIELD_NONE;
> > +
> > + mutex_unlock(&imx219->mutex);
> > }
> >
> > static int imx219_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> > {
> > struct imx219 *imx219 = to_imx219(sd);
> > + struct v4l2_mbus_framefmt *cur_fmt = &imx219->fmt;
> > struct v4l2_mbus_framefmt *try_fmt =
> > v4l2_subdev_get_try_format(sd, fh->pad, 0);
> >
> > mutex_lock(&imx219->mutex);
> >
> > /* Initialize try_fmt */
> > - try_fmt->width = supported_modes[0].width;
> > - try_fmt->height = supported_modes[0].height;
> > - try_fmt->code = imx219_get_format_code(imx219);
> > - try_fmt->field = V4L2_FIELD_NONE;
> > + try_fmt = cur_fmt;
>
> The default try format should reflect the device default, not current
> format. Although the pixel order needs to be taken into account, as was
> already done.
>
My bad, shall replace that with default format.
> >
> > mutex_unlock(&imx219->mutex);
> >
> > @@ -648,14 +690,12 @@ static int imx219_enum_mbus_code(struct v4l2_subdev *sd,
> > {
> > struct imx219 *imx219 = to_imx219(sd);
> >
> > - /*
> > - * Only one bayer order is supported (though it depends on the flip
> > - * settings)
> > - */
> > - if (code->index > 0)
> > + if (code->pad != 0)
> > + return -EINVAL;
>
> The pad is already checked by the caller, no need to repeat here.
>
OK, will drop it.
> > + if (code->index >= (ARRAY_SIZE(codes) / 4))
> > return -EINVAL;
> >
> > - code->code = imx219_get_format_code(imx219);
> > + code->code = imx219_get_format_code(imx219, codes[code->index * 4]);
> >
> > return 0;
> > }
> > @@ -669,7 +709,7 @@ static int imx219_enum_frame_size(struct v4l2_subdev *sd,
> > if (fse->index >= ARRAY_SIZE(supported_modes))
> > return -EINVAL;
> >
> > - if (fse->code != imx219_get_format_code(imx219))
> > + if (fse->code != imx219_get_format_code(imx219, imx219->fmt.code))
> > return -EINVAL;
> >
> > fse->min_width = supported_modes[fse->index].width;
> > @@ -696,7 +736,6 @@ static void imx219_update_pad_format(struct imx219 *imx219,
> > {
> > fmt->format.width = mode->width;
> > fmt->format.height = mode->height;
> > - fmt->format.code = imx219_get_format_code(imx219);
> > fmt->format.field = V4L2_FIELD_NONE;
> >
> > imx219_reset_colorspace(&fmt->format);
> > @@ -710,10 +749,12 @@ static int __imx219_get_pad_format(struct imx219 *imx219,
> > struct v4l2_mbus_framefmt *try_fmt =
> > v4l2_subdev_get_try_format(&imx219->sd, cfg, fmt->pad);
> > /* update the code which could change due to vflip or hflip: */
> > - try_fmt->code = imx219_get_format_code(imx219);
> > + try_fmt->code = imx219_get_format_code(imx219, try_fmt->code);
> > fmt->format = *try_fmt;
> > } else {
> > imx219_update_pad_format(imx219, imx219->mode, fmt);
> > + fmt->format.code = imx219_get_format_code(imx219,
> > + imx219->fmt.code);
> > }
> >
> > return 0;
> > @@ -741,11 +782,18 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
> > const struct imx219_mode *mode;
> > struct v4l2_mbus_framefmt *framefmt;
> > int exposure_max, exposure_def, hblank;
> > + int i;
>
> unsigned int
>
sure will change it.
> >
> > mutex_lock(&imx219->mutex);
> >
> > + for (i = 0; i < ARRAY_SIZE(codes); i++)
> > + if (codes[i] == fmt->format.code)
> > + break;
> > + if (i >= ARRAY_SIZE(codes))
> > + i = 0;
> > +
> > /* Bayer order varies with flips */
> > - fmt->format.code = imx219_get_format_code(imx219);
> > + fmt->format.code = imx219_get_format_code(imx219, codes[i]);
> >
> > mode = v4l2_find_nearest_size(supported_modes,
> > ARRAY_SIZE(supported_modes),
> > @@ -755,7 +803,9 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
> > if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
> > framefmt = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
> > *framefmt = fmt->format;
> > - } else if (imx219->mode != mode) {
> > + } else if (imx219->mode != mode ||
> > + imx219->fmt.code != fmt->format.code) {
> > + imx219->fmt = fmt->format;
> > imx219->mode = mode;
> > /* Update limits and set FPS to default */
> > __v4l2_ctrl_modify_range(imx219->vblank, IMX219_VBLANK_MIN,
> > @@ -786,6 +836,40 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
> > return 0;
> > }
> >
> > +static int imx219_set_framefmt(struct imx219 *imx219)
> > +{
> > + int ret;
> > +
> > + switch (imx219->fmt.code) {
> > + case MEDIA_BUS_FMT_SRGGB8_1X8:
> > + case MEDIA_BUS_FMT_SGRBG8_1X8:
> > + case MEDIA_BUS_FMT_SGBRG8_1X8:
> > + case MEDIA_BUS_FMT_SBGGR8_1X8:
> > + ret = imx219_write_reg(imx219, IMX219_CSI_DATA_FORMAT_A_0_7,
> > + IMX219_REG_VALUE_08BIT, 0x08);
> > + ret |= imx219_write_reg(imx219, IMX219_CSI_DATA_FORMAT_A_8_15,
> > + IMX219_REG_VALUE_08BIT, 0x08);
> > + ret |= imx219_write_reg(imx219, IMX219_OPPXCK_DIV,
> > + IMX219_REG_VALUE_08BIT, 0x08);
>
> What kind of error codes do you expect to get? :-)
>
> Please either return the error immediately, or check ret before the
> assignment.
>
sure will change it and instead make it a bulk write.
> > + break;
> > + case MEDIA_BUS_FMT_SRGGB10_1X10:
> > + case MEDIA_BUS_FMT_SGRBG10_1X10:
> > + case MEDIA_BUS_FMT_SGBRG10_1X10:
> > + case MEDIA_BUS_FMT_SBGGR10_1X10:
> > + ret = imx219_write_reg(imx219, IMX219_CSI_DATA_FORMAT_A_0_7,
> > + IMX219_REG_VALUE_08BIT, 0x0a);
> > + ret |= imx219_write_reg(imx219, IMX219_CSI_DATA_FORMAT_A_8_15,
> > + IMX219_REG_VALUE_08BIT, 0x0a);
> > + ret |= imx219_write_reg(imx219, IMX219_OPPXCK_DIV,
> > + IMX219_REG_VALUE_08BIT, 0x0a);
> > + break;
> > + default:
> > + ret = -EINVAL;
>
> You could return -EINVAL here.
>
OK
> > + }
> > +
> > + return ret;
> > +}
> > +
> > static int imx219_start_streaming(struct imx219 *imx219)
> > {
> > struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
> > @@ -800,6 +884,12 @@ static int imx219_start_streaming(struct imx219 *imx219)
> > return ret;
> > }
> >
> > + ret = imx219_set_framefmt(imx219);
> > + if (ret) {
> > + dev_err(&client->dev, "%s failed to set format\n", __func__);
>
> The error code could be useful.
>
OK, will include ret in the print.
Cheers,
--Prabhakar
> > + return ret;
> > + }
> > +
> > /* Apply customized values from user */
> > ret = __v4l2_ctrl_handler_setup(imx219->sd.ctrl_handler);
> > if (ret)
> > @@ -1253,6 +1343,9 @@ static int imx219_probe(struct i2c_client *client)
> > /* Initialize source pad */
> > imx219->pad.flags = MEDIA_PAD_FL_SOURCE;
> >
> > + /* Initialize default format */
> > + imx219_set_default_format(imx219);
> > +
> > ret = media_entity_pads_init(&imx219->sd.entity, 1, &imx219->pad);
> > if (ret) {
> > dev_err(dev, "failed to init entity pads: %d\n", ret);
>
> --
> Kind regards,
>
> Sakari Ailus
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