Re: [PATCH 2/3] media: i2c: imx219: Add support for SRGGB8_1X8 format
From: Andrey Konovalov
Date: Mon Mar 02 2020 - 10:13:25 EST
Hi Lad,
Thanks for the patch!
On 28.02.2020 19:55, Lad Prabhakar wrote:
imx219 sensor is capable for RAW8/RAW10 modes, this commit adds support
for SRGGB8_1X8 format.
... but not for SGRBG8_1X8, SGBRG8_1X8, and SBGGR8_1X8?
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
---
drivers/media/i2c/imx219.c | 122 +++++++++++++++++++++++++++++--------
1 file changed, 96 insertions(+), 26 deletions(-)
diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index 8b48e148f2d0..1388c9bc00bb 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -90,6 +90,9 @@
#define IMX219_REG_ORIENTATION 0x0172
+#define IMX219_CSI_DATA_FORMAT_A_0_7 0x018c
+#define IMX219_CSI_DATA_FORMAT_A_8_15 0x018d
+
/* Test Pattern Control */
#define IMX219_REG_TEST_PATTERN 0x0600
#define IMX219_TEST_PATTERN_DISABLE 0
@@ -135,6 +138,16 @@ struct imx219_mode {
struct imx219_reg_list reg_list;
};
+struct imx219_pixfmt {
+ u32 code;
+ u32 colorspace;
+};
+
+static const struct imx219_pixfmt imx219_formats[] = {
+ { MEDIA_BUS_FMT_SRGGB8_1X8, V4L2_COLORSPACE_SRGB, },
+ { MEDIA_BUS_FMT_SRGGB10_1X10, V4L2_COLORSPACE_SRGB },
+};
This table has only one (RGGB) layout (out of 4 possible) for 8-bit and for 10-bit
modes.
+
/*
* Register sets lifted off the i2C interface from the Raspberry Pi firmware
* driver.
@@ -168,8 +181,6 @@ static const struct imx219_reg mode_3280x2464_regs[] = {
{0x0171, 0x01},
{0x0174, 0x00},
{0x0175, 0x00},
- {0x018c, 0x0a},
- {0x018d, 0x0a},
{0x0301, 0x05},
{0x0303, 0x01},
{0x0304, 0x03},
@@ -230,8 +241,6 @@ 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},
@@ -290,8 +299,6 @@ 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},
@@ -413,6 +420,8 @@ struct imx219 {
struct v4l2_subdev sd;
struct media_pad pad;
+ struct v4l2_mbus_framefmt fmt;
+
- adding the whole struct v4l2_mbus_framefmt for "is it RAW10 or RAW8" looks
like an overkill (and adds some duplication of code - see below).
struct clk *xclk; /* system clock to IMX219 */
u32 xclk_freq;
@@ -519,19 +528,26 @@ 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)
Naming the 2nd argument as 'code' seems a bit confusing to me, as it
used to select between MEDIA_BUS_FMT_*_1X10 and MEDIA_BUS_FMT_*_1X8.
While the Bayer order depends on the current hflip/vflip settings
(they are stored in struct imx219).
{
- /*
- * Only one bayer order is supported.
- * It depends on the flip settings.
- */
- static const u32 codes[2][2] = {
+ static const u32 codes10[2][2] = {
{ MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10, },
{ MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10, },
};
+ static const u32 codes8[2][2] = {
+ { MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8, },
+ { MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8, },
+ };
lockdep_assert_held(&imx219->mutex);
- return codes[imx219->vflip->val][imx219->hflip->val];
+
+ if (code == MEDIA_BUS_FMT_SRGGB10_1X10 ||
+ code == MEDIA_BUS_FMT_SGRBG10_1X10 ||
+ code == MEDIA_BUS_FMT_SGBRG10_1X10 ||
+ code == MEDIA_BUS_FMT_SBGGR10_1X10)
+ return codes10[imx219->vflip->val][imx219->hflip->val];
+
+ return codes8[imx219->vflip->val][imx219->hflip->val];
}
Wouldn't extending the original table be a better and simpler solution?
Something like:
static u32 imx219_get_format_code(struct imx219 *imx219, int is_8_bit)
{
static const u32 codes[2][2][2] = {
{
{ 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, },
},
};
lockdep_assert_held(&imx219->mutex);
return codes[is_8bit][imx219->vflip->val][imx219->hflip->val];
}
"is_8bit" a member of struct imx219 which equals to 0 if the sensor if RAW10 mode,
and is 1 for RAW8 mode.
static int imx219_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
@@ -539,13 +555,26 @@ static int imx219_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
struct imx219 *imx219 = to_imx219(sd);
struct v4l2_mbus_framefmt *try_fmt =
v4l2_subdev_get_try_format(sd, fh->pad, 0);
+ struct v4l2_mbus_framefmt *fmt;
mutex_lock(&imx219->mutex);
+ fmt = &imx219->fmt;
+ fmt->code = MEDIA_BUS_FMT_SRGGB8_1X8;
+ 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;
+
/* 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->code = imx219_get_format_code(imx219, fmt->code);
try_fmt->field = V4L2_FIELD_NONE;
mutex_unlock(&imx219->mutex);
@@ -646,16 +675,12 @@ static int imx219_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_mbus_code_enum *code)
{
- struct imx219 *imx219 = to_imx219(sd);
-
- /*
- * Only one bayer order is supported (though it depends on the flip
- * settings)
- */
Guess the above comment still holds
- if (code->index > 0)
Though two media bus formats will be available: 8-bit and 10-bit ones, both
with the same Bayer order.
+ if (code->pad != 0)
+ return -EINVAL;
+ if (code->index >= ARRAY_SIZE(imx219_formats))
return -EINVAL;
- code->code = imx219_get_format_code(imx219);
+ code->code = imx219_formats[code->index].code;
This excludes all the Bayer orders except RGGB thus breaking the hflip/vflip support, right?
I would better check (as the sensor can only support two media bus formats at a time):
if (code->index > 1)
return -EINVAL;
and use imx219_get_format_code(struct imx219 *imx219, int is_8_bit) to set the code->code:
code->code = imx219_get_format_code(imx219, code->index);
return 0;
}
@@ -669,7 +694,7 @@ 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;
Looking at the "[PATCH 3/3] media: i2c: imx219: Add support 640x480",
the RAW8 mode is added to the end of the supported_modes[] array after the three RAW10 modes.
Guess this breaks VIDIOC_SUBDEV_ENUM_FRAME_SIZE ioctl for RAW8, as in the RAW8 case
it would return 0 (and the supported frame sizes) for fse->index=3 only, while for all
the other values, fse->index=0 included, it will return -EINVAL ...
@@ -696,7 +721,7 @@ 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.code = imx219_get_format_code(imx219, imx219->fmt.code);
fmt->format.field = V4L2_FIELD_NONE;
imx219_reset_colorspace(&fmt->format);
@@ -710,7 +735,7 @@ 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);
@@ -741,11 +766,19 @@ 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;
mutex_lock(&imx219->mutex);
+ for (i = 0; i < ARRAY_SIZE(imx219_formats); i++)
+ if (imx219_formats[i].code == fmt->format.code)
This excludes all the Bayer orders except RGGB thus breaking the hflip/vflip support, right?
+ break;
+ if (i >= ARRAY_SIZE(imx219_formats))
+ i = 0;
+
/* Bayer order varies with flips */
- fmt->format.code = imx219_get_format_code(imx219);
+ fmt->format.code = imx219_get_format_code(imx219,
+ imx219_formats[i].code);
mode = v4l2_find_nearest_size(supported_modes,
ARRAY_SIZE(supported_modes),
@@ -756,6 +789,7 @@ static int imx219_set_pad_format(struct v4l2_subdev *sd,
framefmt = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
*framefmt = fmt->format;
} else if (imx219->mode != mode) {
+ 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 +820,36 @@ 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);
+ 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);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
static int imx219_start_streaming(struct imx219 *imx219)
{
struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd);
@@ -800,6 +864,12 @@ static int imx219_start_streaming(struct imx219 *imx219)
return ret;
}
+ ret = imx219_set_framefmt(imx219);
I just wonder if it makes sense to remove setting IMX219_CSI_DATA_FORMAT_A register
from the struct imx219_reg mode_x_y_regs[] tables and to introduce new imx219_set_framefmt()
function which is called right after the settings from the mode_x_y_regs[] are written
into the sensor, and is never called otherwise?
+ if (ret) {
+ dev_err(&client->dev, "%s failed to set format\n", __func__);
+ return ret;
+ }
+
/* Apply customized values from user */
ret = __v4l2_ctrl_handler_setup(imx219->sd.ctrl_handler);
if (ret)