media: atomisp: ov2680: Stop using half pixelclock for binned modes

Stop using half pixelclock for binned modes this fixes:
1. The exposure being twice as high for binned mods (due to the half clk)
2. The framerate being 15 fps instead of 30 fps

The original code with fixed per mode register lists did use half pixel
clk, but this should be combined with using half for the VTS value too.

Using half VTS fixes the framerate issue, but this has the undesired
side-effect of change the exposure ctrl range (half the range, double
the amount of exposure per step).

Link: https://lore.kernel.org/r/20230604161406.69369-3-hdegoede@redhat.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/i2c/atomisp-ov2680.c

@@ -244,27 +244,21 @@ static void ov2680_calc_mode(struct ov2680_dev *sensor)
 static int ov2680_set_mode(struct ov2680_dev *sensor)
 {
 	struct i2c_client *client = sensor->client;
-	u8 pll_div, unknown, inc, fmt1, fmt2;
+	u8 unknown, inc, fmt1, fmt2;
 	int ret;
 
 	if (sensor->mode.binning) {
-		pll_div = 1;
 		unknown = 0x23;
 		inc = 0x31;
 		fmt1 = 0xc2;
 		fmt2 = 0x01;
 	} else {
-		pll_div = 0;
 		unknown = 0x21;
 		inc = 0x11;
 		fmt1 = 0xc0;
 		fmt2 = 0x00;
 	}
 
-	ret = ov_write_reg8(client, 0x3086, pll_div);
-	if (ret)
-		return ret;
-
 	ret = ov_write_reg8(client, 0x370a, unknown);
 	if (ret)
 		return ret;

drivers/staging/media/atomisp/i2c/ov2680.h

@@ -181,6 +181,7 @@ static struct ov2680_reg const ov2680_global_setting[] = {
 	{0x3082, 0x45},
 	{0x3084, 0x09},
 	{0x3085, 0x04},
+	{0x3086, 0x00},
 	{0x3503, 0x03},
 	{0x350b, 0x36},
 	{0x3600, 0xb4},