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media: hi556: correct the test pattern configuration

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commit 020f602b06 upstream.

Hynix hi556 support 8 test pattern modes:
hi556_test_pattern_menu[] = {
{
	"Disabled",
	"Solid Colour",
	"100% Colour Bars",
	"Fade To Grey Colour Bars",
	"PN9",
	"Gradient Horizontal",
	"Gradient Vertical",
	"Check Board",
	"Slant Pattern",
}

The test pattern is set by a 8-bit register according to the
specification.
+--------+-------------------------------+
| BIT[0] |  Solid color                  |
+--------+-------------------------------+
| BIT[1] |  Color bar                    |
+--------+-------------------------------+
| BIT[2] |  Fade to grey color bar       |
+--------+-------------------------------+
| BIT[3] |  PN9                          |
+--------+-------------------------------+
| BIT[4] |  Gradient horizontal          |
+--------+-------------------------------+
| BIT[5] |  Gradient vertical            |
+--------+-------------------------------+
| BIT[6] |  Check board                  |
+--------+-------------------------------+
| BIT[7] |  Slant pattern                |
+--------+-------------------------------+
Based on function above, current test pattern programming is wrong.
This patch fixes it by 'BIT(pattern - 1)'. If pattern is 0, driver
will disable the test pattern generation and set the pattern to 0.

Fixes: e62138403a ("media: hi556: Add support for Hi-556 sensor")
Cc: stable@vger.kernel.org
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bingbu Cao 2025-06-30 17:04:20 +08:00 committed by Greg Kroah-Hartman
parent 7b15256361
commit 5c54ef825c
1 changed files with 14 additions and 12 deletions
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26
drivers/media/i2c/hi556.c
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@ -756,21 +756,23 @@ static int hi556_test_pattern(struct hi556 *hi556, u32 pattern)
int ret;
u32 val;
if (pattern) {
ret = hi556_read_reg(hi556, HI556_REG_ISP,
HI556_REG_VALUE_08BIT, &val);
if (ret)
return ret;
ret = hi556_read_reg(hi556, HI556_REG_ISP,
HI556_REG_VALUE_08BIT, &val);
if (ret)
return ret;
ret = hi556_write_reg(hi556, HI556_REG_ISP,
HI556_REG_VALUE_08BIT,
val | HI556_REG_ISP_TPG_EN);
if (ret)
return ret;
}
val = pattern ? (val | HI556_REG_ISP_TPG_EN) :
(val & ~HI556_REG_ISP_TPG_EN);
ret = hi556_write_reg(hi556, HI556_REG_ISP,
HI556_REG_VALUE_08BIT, val);
if (ret)
return ret;
val = pattern ? BIT(pattern - 1) : 0;
return hi556_write_reg(hi556, HI556_REG_TEST_PATTERN,
HI556_REG_VALUE_08BIT, pattern);
HI556_REG_VALUE_08BIT, val);
}
static int hi556_set_ctrl(struct v4l2_ctrl *ctrl)