Re: [PATCH 4/6 v3] [media] ov9740: Remove hardcoded resolution regs

From: Laurent Pinchart
Date: Wed Jun 29 2011 - 05:51:50 EST

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Hi Andrew,

Thanks for the patch.

On Friday 24 June 2011 01:19:42 achew@xxxxxxxxxx wrote:
> From: Andrew Chew <achew@xxxxxxxxxx>
>
> Derive resolution-dependent register settings programmatically.
>
> Signed-off-by: Andrew Chew <achew@xxxxxxxxxx>
> ---
> drivers/media/video/ov9740.c | 210
> +++++++++++++++++++++++------------------- 1 files changed, 114
> insertions(+), 96 deletions(-)
>
> diff --git a/drivers/media/video/ov9740.c b/drivers/media/video/ov9740.c
> index 72c6ac1d..decd706 100644
> --- a/drivers/media/video/ov9740.c
> +++ b/drivers/media/video/ov9740.c
> @@ -181,27 +181,8 @@
> #define OV9740_MIPI_CTRL_3012 0x3012
> #define OV9740_SC_CMMM_MIPI_CTR 0x3014
>
> -/* supported resolutions */
> -enum {
> - OV9740_VGA,
> - OV9740_720P,
> -};
> -
> -struct ov9740_resolution {
> - unsigned int width;
> - unsigned int height;
> -};
> -
> -static struct ov9740_resolution ov9740_resolutions[] = {
> - [OV9740_VGA] = {
> - .width = 640,
> - .height = 480,
> - },
> - [OV9740_720P] = {
> - .width = 1280,
> - .height = 720,
> - },
> -};
> +#define OV9740_MAX_WIDTH 1280
> +#define OV9740_MAX_HEIGHT 720
>
> /* Misc. structures */
> struct ov9740_reg {
> @@ -403,54 +384,6 @@ static const struct ov9740_reg ov9740_defaults[] = {
> { OV9740_ISP_CTRL19, 0x02 },
> };
>
> -static const struct ov9740_reg ov9740_regs_vga[] = {
> - { OV9740_X_ADDR_START_HI, 0x00 },
> - { OV9740_X_ADDR_START_LO, 0xa0 },
> - { OV9740_Y_ADDR_START_HI, 0x00 },
> - { OV9740_Y_ADDR_START_LO, 0x00 },
> - { OV9740_X_ADDR_END_HI, 0x04 },
> - { OV9740_X_ADDR_END_LO, 0x63 },
> - { OV9740_Y_ADDR_END_HI, 0x02 },
> - { OV9740_Y_ADDR_END_LO, 0xd3 },
> - { OV9740_X_OUTPUT_SIZE_HI, 0x02 },
> - { OV9740_X_OUTPUT_SIZE_LO, 0x80 },
> - { OV9740_Y_OUTPUT_SIZE_HI, 0x01 },
> - { OV9740_Y_OUTPUT_SIZE_LO, 0xe0 },
> - { OV9740_ISP_CTRL1E, 0x03 },
> - { OV9740_ISP_CTRL1F, 0xc0 },
> - { OV9740_ISP_CTRL20, 0x02 },
> - { OV9740_ISP_CTRL21, 0xd0 },
> - { OV9740_VFIFO_READ_START_HI, 0x01 },
> - { OV9740_VFIFO_READ_START_LO, 0x40 },
> - { OV9740_ISP_CTRL00, 0xff },
> - { OV9740_ISP_CTRL01, 0xff },
> - { OV9740_ISP_CTRL03, 0xff },
> -};
> -
> -static const struct ov9740_reg ov9740_regs_720p[] = {
> - { OV9740_X_ADDR_START_HI, 0x00 },
> - { OV9740_X_ADDR_START_LO, 0x00 },
> - { OV9740_Y_ADDR_START_HI, 0x00 },
> - { OV9740_Y_ADDR_START_LO, 0x00 },
> - { OV9740_X_ADDR_END_HI, 0x05 },
> - { OV9740_X_ADDR_END_LO, 0x03 },
> - { OV9740_Y_ADDR_END_HI, 0x02 },
> - { OV9740_Y_ADDR_END_LO, 0xd3 },
> - { OV9740_X_OUTPUT_SIZE_HI, 0x05 },
> - { OV9740_X_OUTPUT_SIZE_LO, 0x00 },
> - { OV9740_Y_OUTPUT_SIZE_HI, 0x02 },
> - { OV9740_Y_OUTPUT_SIZE_LO, 0xd0 },
> - { OV9740_ISP_CTRL1E, 0x05 },
> - { OV9740_ISP_CTRL1F, 0x00 },
> - { OV9740_ISP_CTRL20, 0x02 },
> - { OV9740_ISP_CTRL21, 0xd0 },
> - { OV9740_VFIFO_READ_START_HI, 0x02 },
> - { OV9740_VFIFO_READ_START_LO, 0x30 },
> - { OV9740_ISP_CTRL00, 0xff },
> - { OV9740_ISP_CTRL01, 0xef },
> - { OV9740_ISP_CTRL03, 0xff },
> -};
> -
> static enum v4l2_mbus_pixelcode ov9740_codes[] = {
> V4L2_MBUS_FMT_YUYV8_2X8,
> };
> @@ -727,39 +660,124 @@ static int ov9740_set_register(struct v4l2_subdev
> *sd, /* select nearest higher resolution for capture */
> static void ov9740_res_roundup(u32 *width, u32 *height)
> {
> - int i;
> + /* Width must be a multiple of 4 pixels. */
> + *width = ALIGN(*width, 4);
>
> - for (i = 0; i < ARRAY_SIZE(ov9740_resolutions); i++)
> - if ((ov9740_resolutions[i].width >= *width) &&
> - (ov9740_resolutions[i].height >= *height)) {
> - *width = ov9740_resolutions[i].width;
> - *height = ov9740_resolutions[i].height;
> - return;
> - }
> + /* Max resolution is 1280x720 (720p). */
> + if (*width > OV9740_MAX_WIDTH)
> + *width = OV9740_MAX_WIDTH;
>
> - *width = ov9740_resolutions[OV9740_720P].width;
> - *height = ov9740_resolutions[OV9740_720P].height;
> + if (*height > OV9740_MAX_HEIGHT)
> + *height = OV9740_MAX_HEIGHT;
> }
>
> /* Setup registers according to resolution and color encoding */
> -static int ov9740_set_res(struct i2c_client *client, u32 width)
> +static int ov9740_set_res(struct i2c_client *client, u32 width, u32
> height) {
> + u32 x_start;
> + u32 y_start;
> + u32 x_end;
> + u32 y_end;
> + bool scaling = 0;
> + u32 scale_input_x;
> + u32 scale_input_y;
> int ret;
>
> - /* select register configuration for given resolution */
> - if (width == ov9740_resolutions[OV9740_VGA].width) {
> - dev_dbg(&client->dev, "Setting image size to 640x480\n");
> - ret = ov9740_reg_write_array(client, ov9740_regs_vga,
> - ARRAY_SIZE(ov9740_regs_vga));
> - } else if (width == ov9740_resolutions[OV9740_720P].width) {
> - dev_dbg(&client->dev, "Setting image size to 1280x720\n");
> - ret = ov9740_reg_write_array(client, ov9740_regs_720p,
> - ARRAY_SIZE(ov9740_regs_720p));
> + if ((width != OV9740_MAX_WIDTH) || (height != OV9740_MAX_HEIGHT))
> + scaling = 1;
> +
> + /*
> + * Try to use as much of the sensor area as possible when supporting
> + * smaller resolutions. Depending on the aspect ratio of the
> + * chosen resolution, we can either use the full width of the sensor,
> + * or the full height of the sensor (or both if the aspect ratio is
> + * the same as 1280x720.
> + */
> + if ((OV9740_MAX_WIDTH * height) > (OV9740_MAX_HEIGHT * width)) {
> + scale_input_x = (OV9740_MAX_HEIGHT * width) / height;
> + scale_input_y = OV9740_MAX_HEIGHT;
> } else {
> - dev_err(&client->dev, "Failed to select resolution!\n");
> - return -EINVAL;
> + scale_input_x = OV9740_MAX_WIDTH;
> + scale_input_y = (OV9740_MAX_WIDTH * height) / width;
> }
>
> + /* These describe the area of the sensor to use. */
> + x_start = (OV9740_MAX_WIDTH - scale_input_x) / 2;
> + y_start = (OV9740_MAX_HEIGHT - scale_input_y) / 2;
> + x_end = x_start + scale_input_x - 1;
> + y_end = y_start + scale_input_y - 1;
> +
> + ret = ov9740_reg_write(client, OV9740_X_ADDR_START_HI, x_start >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_X_ADDR_START_LO, x_start & 0xff);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_Y_ADDR_START_HI, y_start >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_Y_ADDR_START_LO, y_start & 0xff);
> + if (ret)
> + goto done;
> +
> + ret = ov9740_reg_write(client, OV9740_X_ADDR_END_HI, x_end >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_X_ADDR_END_LO, x_end & 0xff);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_Y_ADDR_END_HI, y_end >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_Y_ADDR_END_LO, y_end & 0xff);
> + if (ret)
> + goto done;
> +
> + ret = ov9740_reg_write(client, OV9740_X_OUTPUT_SIZE_HI, width >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_X_OUTPUT_SIZE_LO, width & 0xff);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_Y_OUTPUT_SIZE_HI, height >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_Y_OUTPUT_SIZE_LO, height & 0xff);
> + if (ret)
> + goto done;
> +
> + ret = ov9740_reg_write(client, OV9740_ISP_CTRL1E, scale_input_x >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_ISP_CTRL1F, scale_input_x & 0xff);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_ISP_CTRL20, scale_input_y >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_ISP_CTRL21, scale_input_y & 0xff);
> + if (ret)
> + goto done;

Now that we know what control registers 1e to 21 are for, what about renaming
them ? Are they called CTRL1E to CTRL21 in the vendor documentation ?

> +
> + ret = ov9740_reg_write(client, OV9740_VFIFO_READ_START_HI,
> + (scale_input_x - width) >> 8);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_VFIFO_READ_START_LO,
> + (scale_input_x - width) & 0xff);
> + if (ret)
> + goto done;
> +
> + ret = ov9740_reg_write(client, OV9740_ISP_CTRL00, 0xff);
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_ISP_CTRL01, 0xef |
> + (scaling << 4));
> + if (ret)
> + goto done;
> + ret = ov9740_reg_write(client, OV9740_ISP_CTRL03, 0xff);
> +
> +done:
> return ret;
> }
>
> @@ -787,7 +805,7 @@ static int ov9740_s_fmt(struct v4l2_subdev *sd,
> if (ret < 0)
> return ret;
>
> - ret = ov9740_set_res(client, mf->width);
> + ret = ov9740_set_res(client, mf->width, mf->height);
> if (ret < 0)
> return ret;
>
> @@ -824,8 +842,8 @@ static int ov9740_cropcap(struct v4l2_subdev *sd,
> struct v4l2_cropcap *a) {
> a->bounds.left = 0;
> a->bounds.top = 0;
> - a->bounds.width = ov9740_resolutions[OV9740_720P].width;
> - a->bounds.height = ov9740_resolutions[OV9740_720P].height;
> + a->bounds.width = OV9740_MAX_WIDTH;
> + a->bounds.height = OV9740_MAX_HEIGHT;
> a->defrect = a->bounds;
> a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> a->pixelaspect.numerator = 1;
> @@ -838,8 +856,8 @@ static int ov9740_g_crop(struct v4l2_subdev *sd, struct
> v4l2_crop *a) {
> a->c.left = 0;
> a->c.top = 0;
> - a->c.width = ov9740_resolutions[OV9740_720P].width;
> - a->c.height = ov9740_resolutions[OV9740_720P].height;
> + a->c.width = OV9740_MAX_WIDTH;
> + a->c.height = OV9740_MAX_HEIGHT;
> a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
>
> return 0;

--
Regards,

Laurent Pinchart
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Next message: David Miller: "Re: linux-next: build failure after merge of the final tree (nettree related)"
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Next in thread: Andrew Chew: "RE: [PATCH 4/6 v3] [media] ov9740: Remove hardcoded resolution regs"
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