[PATCH v4 07/16] media: sony-starvis2: Correct the exposure range

[Dave Stevenson <dave.stevenson@raspberrypi.com>]

The software reference for imx678 lists register SHR0 setting
the shutter sweep time with a valid range of 4 to (Number of
lines per frame - 1), and then gives the example of all-pixel
scan mode with VMAX=2250 and SHR0=2249 giving an integration
time of "1H + Toffset" (further defining Toffset as 0).

The driver defining STARVIS2_EXPOSURE_MIN as 2 would therefore
be contradictory, and doubles the minimum exposure achievable.
The maximum exposure is derived from STARVIS2_SHR_MIN which
is defined as 8, when the actual minimum for that register is
4.

Correct STARVIS2_EXPOSURE_MIN and STARVIS2_SHR_MIN.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/sony-starvis2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/sony-starvis2.c b/drivers/media/i2c/sony-starvis2.c
index 02199336010e..10f91c4b6db3 100644
--- a/drivers/media/i2c/sony-starvis2.c
+++ b/drivers/media/i2c/sony-starvis2.c
@@ -61,10 +61,10 @@
 
 /* SHR internal */
 #define STARVIS2_REG_SHR                  CCI_REG24_LE(0x3050)
-#define STARVIS2_SHR_MIN                  8
+#define STARVIS2_SHR_MIN                  4
 
 /* Exposure control */
-#define STARVIS2_EXPOSURE_MIN             2
+#define STARVIS2_EXPOSURE_MIN             1
 #define STARVIS2_EXPOSURE_STEP            1
 #define STARVIS2_EXPOSURE_DEFAULT         1000
 

-- 
2.34.1