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[v2,06/16] media: i2c: ov9282: Correct HTS register for configured pixel rate

Message ID 20221028160902.2696973-7-dave.stevenson@raspberrypi.com
State Accepted
Commit 6b2a01c90e277d46f99321e4a1f50ee08c04abba
Headers show
Series Updates to ov9282 sensor driver | expand

Commit Message

Dave Stevenson Oct. 28, 2022, 4:08 p.m. UTC 
The calculations from pixel rate, width+hblank, and height+vblank
do not give the correct framerate - it's half the speed it should
be.

The datasheet lists the default for the TIMING_HTS registers (0x380c/d)
as being 0x2d8 (728) which is less than the width of the image, so
the units clearly can't be pixels.
If TIMING_HTS is considered to be units of 2-pixels, then the
resulting value of 0x5b0 (1456) makes all the calculations correct.

This driver is reporting an HBLANK value of 250, with an image width
of 1280, so TIMING_HTS is 1530 (0x5fa) pixels. However it was also
setting the register to 0x5fa, thereby not taking into account it
being units of 2-pixels.

Correct the register value to 0x2fd so that all the timing calculations
give the correct results.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/ov9282.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
index 1524189cf3e5..7e0b12b89655 100644
--- a/drivers/media/i2c/ov9282.c
+++ b/drivers/media/i2c/ov9282.c
@@ -236,8 +236,8 @@  static const struct ov9282_reg mode_1280x720_regs[] = {
 	{0x3809, 0x00},
 	{0x380a, 0x02},
 	{0x380b, 0xd0},
-	{0x380c, 0x05},
-	{0x380d, 0xfa},
+	{0x380c, 0x02},
+	{0x380d, 0xfd},
 	{0x3810, 0x00},
 	{0x3811, 0x08},
 	{0x3812, 0x00},