Umang and Laurent,

I just checked the spec, 0xc98 should be the initial value not for 4208x3118, the patch
looks good to me though I am not working on that anymore.

Reviewed-by: Bingbu Cao <bingbu.cao@intel.com>

On 7/23/21 7:50 PM, Laurent Pinchart wrote:

Hi Umang,

Thank you for the patch.

(Expanding the CC list)

On Fri, Jul 23, 2021 at 04:52:32PM +0530, Umang Jain wrote:

quoted

From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

The frame_length_lines (0x0340) registers are hard-coded as follows:

- 4208x3118
  frame_length_lines = 0x0c50

- 2104x1560
  frame_length_lines = 0x0638

- 1048x780
  frame_length_lines = 0x034c

The driver exposes the V4L2_CID_VBLANK control in read-only mode and
sets its value to vts_def - height, where vts_def is a mode-dependent
value coming from the supported_modes array. It is set using one of
the following macros defined in the driver:

  #define IMX258_VTS_30FPS                0x0c98
  #define IMX258_VTS_30FPS_2K             0x0638
  #define IMX258_VTS_30FPS_VGA            0x034c

There's a clear mismatch in the value for the full resolution mode i.e.
IMX258_VTS_30FPS. Fix it by rectifying the macro with the value set for
the frame_length_lines register as stated above.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Umang Jain <redacted>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

quoted

---
 drivers/media/i2c/imx258.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index 7ab9e5f9f267..4e695096e5d0 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c

@@ -23,7 +23,7 @@
 #define IMX258_CHIP_ID			0x0258
 
 /* V_TIMING internal */
-#define IMX258_VTS_30FPS		0x0c98
+#define IMX258_VTS_30FPS		0x0c50
 #define IMX258_VTS_30FPS_2K		0x0638
 #define IMX258_VTS_30FPS_VGA		0x034c
 #define IMX258_VTS_MAX			0xffff

-- 
Best regards,
Bingbu Cao