linux-kernel - [PATCH v5 4/5] media: i2c: imx219: Increase minimum LLP to fix blocky artefacts

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Message-Id: <20241230-imx219_fixes-v5-4-98446d816489@ideasonboard.com>
Date: Mon, 30 Dec 2024 11:41:21 +0530
From: Jai Luthra <jai.luthra@...asonboard.com>
To: Dave Stevenson <dave.stevenson@...pberrypi.com>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jacopo Mondi <jacopo.mondi@...asonboard.com>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Jai Luthra <jai.luthra@...asonboard.com>
Subject: [PATCH v5 4/5] media: i2c: imx219: Increase minimum LLP to fix
 blocky artefacts

The sensor's internal ADC supports a minimum line length of 3448 pixels,
which may be too small to use with analog binning, where ADC operates on
two lines together. Switch to a higher minimum line length of 3560
pixels to fix the blocky artefacts seen with analog binning [1].

To keep the same default framerate as before for all the modes, lower
the default fll value to compensate for the increase in llp.

[1]: https://github.com/raspberrypi/rpicam-apps/issues/281#issuecomment-1082894118

Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>
---
 drivers/media/i2c/imx219.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c
index 9682a74feb3b7b74cd2ca54779323396c77cd5a5..5cbd7b90bed28bcf59debdba6dfc76bcd34eb9b4 100644
--- a/drivers/media/i2c/imx219.c
+++ b/drivers/media/i2c/imx219.c
@@ -74,7 +74,7 @@
 #define IMX219_FLL_MAX			0xffff
 #define IMX219_VBLANK_MIN		32
 #define IMX219_REG_LINE_LENGTH		CCI_REG16(0x0162)
-#define IMX219_LLP_MIN			0x0d78
+#define IMX219_LLP_MIN			0x0de8
 #define IMX219_LLP_MAX			0x7ff0
 
 #define IMX219_REG_X_ADD_STA_A		CCI_REG16(0x0164)
@@ -287,25 +287,25 @@ static const struct imx219_mode supported_modes[] = {
 		/* 8MPix 15fps mode */
 		.width = 3280,
 		.height = 2464,
-		.fll_def = 3526,
+		.fll_def = 3415,
 	},
 	{
 		/* 1080P 30fps cropped */
 		.width = 1920,
 		.height = 1080,
-		.fll_def = 1763,
+		.fll_def = 1707,
 	},
 	{
 		/* 2x2 binned 30fps mode */
 		.width = 1640,
 		.height = 1232,
-		.fll_def = 1763,
+		.fll_def = 1707,
 	},
 	{
 		/* 640x480 30fps mode */
 		.width = 640,
 		.height = 480,
-		.fll_def = 1763,
+		.fll_def = 1707,
 	},
 };
 

-- 
2.47.1