[PATCH 6.4 609/800] media: atomisp: ov2680: Stop using half pixelclock for binned modes

Greg Kroah-Hartman
2023-07-16T20:21:18Z

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 7d45a432251a30ed0252655177e708229b163291 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/staging/media/atomisp/i2c/atomisp-ov2680.c | 8 +-------
drivers/staging/media/atomisp/i2c/ov2680.h | 1 +
2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
index c079368019e87..3a6bc3e56b10e 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-ov2680.c
@@ -239,27 +239,21 @@ static void ov2680_calc_mode(struct ov2680_device *sensor, int width, int height
static int ov2680_set_mode(struct ov2680_device *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 baf49eb0659e3..eed18d6943370 100644
--- a/drivers/staging/media/atomisp/i2c/ov2680.h
+++ b/drivers/staging/media/atomisp/i2c/ov2680.h
@@ -172,6 +172,7 @@ static struct ov2680_reg const ov2680_global_setting[] = {
{0x3082, 0x45},
{0x3084, 0x09},
{0x3085, 0x04},
+ {0x3086, 0x00},
{0x3503, 0x03},
{0x350b, 0x36},
{0x3600, 0xb4},
--
2.39.2