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;
+
+ 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;
--
1.7.5.4
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