linux-kernel - [PATCH v4] media: ov8856: Configure sensor for GRBG Bayer for all modes

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Message-Id: <20210118190132.1045913-1-robert.foss@linaro.org>
Date:   Mon, 18 Jan 2021 20:01:32 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     dongchun.zhu@...iatek.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dongchun Zhu <Dongchun.Zhu@...iatek.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...ux.intel.com>,
        Andrey Konovalov <andrey.konovalov@...aro.org>
Cc:     Tomasz Figa <tfiga@...gle.com>,
        Robert Foss <robert.foss@...aro.org>
Subject: [PATCH v4] media: ov8856: Configure sensor for GRBG Bayer for all modes

The previously added modes 3264x2448 & 1632x1224 are actually
configuring the sensor for BGGR mode, this is an issue since
the mode that is exposed through V4L incorrectly is set as GRBG.

This patch fixes the issue by moving the output crop window of
internal sensor ISP uses by one row, which means that the Bayer
pattern of the output is changed.

From:
row 1: B G B G B G ...
row 2: G R G R G R ...
raw 3: B G B G B G ...
...

To:
raw 2: G R G R G R ...
raw 3: B G B G B G ...
...

Signed-off-by: Robert Foss <robert.foss@...aro.org>
Suggested-by: Andrey Konovalov <andrey.konovalov@...aro.org>
---

Changes since v1:
 - Sakari: Added mode information to ov8856_mode struct
 - Sakari: enum_mbus_code updated

Changes since v2:
 - Andrey: Switched approach to changing the sensor configuration
   to yield identical Bayer modes for all modes

Changes since v3:
 - Andrey: Improve commit msg to explain Bayer shift better

 drivers/media/i2c/ov8856.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/ov8856.c b/drivers/media/i2c/ov8856.c
index 2f4ceaa80593..8a355135c7db 100644
--- a/drivers/media/i2c/ov8856.c
+++ b/drivers/media/i2c/ov8856.c
@@ -428,7 +428,7 @@ static const struct ov8856_reg mode_3264x2448_regs[] = {
 	{0x3810, 0x00},
 	{0x3811, 0x04},
 	{0x3812, 0x00},
-	{0x3813, 0x02},
+	{0x3813, 0x01},
 	{0x3814, 0x01},
 	{0x3815, 0x01},
 	{0x3816, 0x00},
@@ -821,7 +821,7 @@ static const struct ov8856_reg mode_1632x1224_regs[] = {
 	{0x3810, 0x00},
 	{0x3811, 0x02},
 	{0x3812, 0x00},
-	{0x3813, 0x02},
+	{0x3813, 0x01},
 	{0x3814, 0x03},
 	{0x3815, 0x01},
 	{0x3816, 0x00},
-- 
2.27.0