From: Hans de Goede <hdegoede@redhat.com>
Date: Sun, 4 Jun 2023 16:14:03 +0000 (+0100)
Subject: media: atomisp: ov2680: Stop using half pixelclock for binned modes
X-Git-Tag: v6.5-rc1~48^2~38
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=7d45a432251a30ed0252655177e708229b163291;p=users%2Fdwmw2%2Flinux.git

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.com

Signed-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>
---

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
index 18b604a8b9322..10b27a45b8857 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
+++ b/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;
diff --git a/drivers/staging/media/atomisp/i2c/ov2680.h b/drivers/staging/media/atomisp/i2c/ov2680.h
index fd9c7485f8c19..b6c0ef591c693 100644
--- a/drivers/staging/media/atomisp/i2c/ov2680.h
+++ b/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},