The ADV7604, ADV7611 and ADV7612 software manuals document the CP_HUE value differently: - For ADV7604 and ADV7611, the hue is specified as an unsigned 8-bit value, and calculated as (CP_HUE[7:0] * 180) / 256 - 90 with the range set to [-90°, 90°]. Additionally, the values 0x00, 0x0f and 0xff are documented as corresponding to -90°, 0° and 90° respectively. - For ADV7612, the hue is specified as a signed 8-bit value in the range [0°, 360°[ without any formula. Additionally, the value 0x00 is documented as corresponding to 0°. The ADV7604 and ADV7611 documentation is clearly wrong as the example values don't correspond to the formula. Furthermore, the [-90°, 90°] range seems incorrect as it would cover only half of the hue space. The ADV7612 documentation is better, although the range should likely be [-180°, 180°[ if the value is signed. Given that the values wrap around, this makes no difference in practice. The hue values have been verified on ADV7612 to follow the documentation. There is a high chance they do as well on ADV7604 and ADV7611. In any case, all software manuals document the register as 8-bit, so the current range of the V4L2 hue control [0, 128] is not correct. Expand it to cover the full 8-bit space, using unsigned values to avoid breaking any application that may rely on 128 being a valid value. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> Reviewed-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> Tested-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx> --- Changes since v1: - Fix typo in commit message --- drivers/media/i2c/adv7604.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c index 3af0e67f9edb..3d0898c4175e 100644 --- a/drivers/media/i2c/adv7604.c +++ b/drivers/media/i2c/adv7604.c @@ -3548,7 +3548,7 @@ static int adv76xx_probe(struct i2c_client *client) v4l2_ctrl_new_std(hdl, &adv76xx_ctrl_ops, V4L2_CID_SATURATION, 0, 255, 1, 128); v4l2_ctrl_new_std(hdl, &adv76xx_ctrl_ops, - V4L2_CID_HUE, 0, 128, 1, 0); + V4L2_CID_HUE, 0, 255, 1, 0); ctrl = v4l2_ctrl_new_std_menu(hdl, &adv76xx_ctrl_ops, V4L2_CID_DV_RX_IT_CONTENT_TYPE, V4L2_DV_IT_CONTENT_TYPE_NO_ITC, 0, V4L2_DV_IT_CONTENT_TYPE_NO_ITC); -- Regards, Laurent Pinchart
