[PATCH v2 3/3] mt9v022: set y_skip_top field to zero as default

[Anatolij Gustschin <agust@denx.de>]

Set "y_skip_top" to zero and revise comment as I do not see this line
corruption on two different mt9v022 setups. The first read-out line
is perfectly fine. Add mt9v022 platform data configuring y_skip_top
for platforms that have issues with the first read-out line. Set
y_skip_top to 1 for pcm990 board.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
---
Changes since first version:
 - add platform data to mt9v022 with only one parameter to initialise 
   y_skip_top, use 0 as default and set it to 1 on pcm990-baseboard.c
 - revise commit log
 - rebase on staging/for_v3.7 branch

 arch/arm/mach-pxa/pcm990-baseboard.c   |    6 ++++++
 drivers/media/i2c/soc_camera/mt9v022.c |    8 +++++---
 include/media/mt9v022.h                |   16 ++++++++++++++++
 3 files changed, 27 insertions(+), 3 deletions(-)
 create mode 100644 include/media/mt9v022.h

diff --git a/arch/arm/mach-pxa/pcm990-baseboard.c b/arch/arm/mach-pxa/pcm990-baseboard.c
index cb723e8..e2973f2 100644
--- a/arch/arm/mach-pxa/pcm990-baseboard.c
+++ b/arch/arm/mach-pxa/pcm990-baseboard.c
@@ -26,6 +26,7 @@
 #include <linux/i2c/pxa-i2c.h>
 #include <linux/pwm_backlight.h>
 
+#include <media/mt9v022.h>
 #include <media/soc_camera.h>
 
 #include <mach/camera.h>
@@ -468,6 +469,10 @@ static struct i2c_board_info __initdata pcm990_i2c_devices[] = {
 	},
 };
 
+static struct mt9v022_platform_data mt9v022_pdata = {
+	.y_skip_top = 1,
+};
+
 static struct i2c_board_info pcm990_camera_i2c[] = {
 	{
 		I2C_BOARD_INFO("mt9v022", 0x48),
@@ -480,6 +485,7 @@ static struct soc_camera_link iclink[] = {
 	{
 		.bus_id			= 0, /* Must match with the camera ID */
 		.board_info		= &pcm990_camera_i2c[0],
+		.priv			= &mt9v022_pdata,
 		.i2c_adapter_id		= 0,
 		.query_bus_param	= pcm990_camera_query_bus_param,
 		.set_bus_param		= pcm990_camera_set_bus_param,
diff --git a/drivers/media/i2c/soc_camera/mt9v022.c b/drivers/media/i2c/soc_camera/mt9v022.c
index e0f4cb4..8feaddc 100644
--- a/drivers/media/i2c/soc_camera/mt9v022.c
+++ b/drivers/media/i2c/soc_camera/mt9v022.c
@@ -15,6 +15,7 @@
 #include <linux/log2.h>
 #include <linux/module.h>
 
+#include <media/mt9v022.h>
 #include <media/soc_camera.h>
 #include <media/soc_mediabus.h>
 #include <media/v4l2-subdev.h>
@@ -849,6 +850,7 @@ static int mt9v022_probe(struct i2c_client *client,
 	struct mt9v022 *mt9v022;
 	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+	struct mt9v022_platform_data *pdata = icl->priv;
 	int ret;
 
 	if (!icl) {
@@ -912,10 +914,10 @@ static int mt9v022_probe(struct i2c_client *client,
 	mt9v022->chip_control = MT9V022_CHIP_CONTROL_DEFAULT;
 
 	/*
-	 * MT9V022 _really_ corrupts the first read out line.
-	 * TODO: verify on i.MX31
+	 * On some platforms the first read out line is corrupted.
+	 * Workaround it by skipping if indicated by platform data.
 	 */
-	mt9v022->y_skip_top	= 1;
+	mt9v022->y_skip_top	= pdata ? pdata->y_skip_top : 0;
 	mt9v022->rect.left	= MT9V022_COLUMN_SKIP;
 	mt9v022->rect.top	= MT9V022_ROW_SKIP;
 	mt9v022->rect.width	= MT9V022_MAX_WIDTH;
diff --git a/include/media/mt9v022.h b/include/media/mt9v022.h
new file mode 100644
index 0000000..4056180
--- /dev/null
+++ b/include/media/mt9v022.h
@@ -0,0 +1,16 @@
+/*
+ * mt9v022 sensor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __MT9V022_H__
+#define __MT9V022_H__
+
+struct mt9v022_platform_data {
+	unsigned short y_skip_top;	/* Lines to skip at the top */
+};
+
+#endif
-- 
1.7.1