bcm27xx: add support for linux v5.15

Build system: x86_64
Build-tested: bcm2708, bcm2709, bcm2710, bcm2711
Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B

Signed-off-by: Marty Jones <mj8263788@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0735-media-i2c-ov7251-Limit-exposure-based-on-VTS.patch b/target/linux/bcm27xx/patches-5.15/950-0735-media-i2c-ov7251-Limit-exposure-based-on-VTS.patch
new file mode 100644
index 0000000000..77686190e5
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0735-media-i2c-ov7251-Limit-exposure-based-on-VTS.patch
@@ -0,0 +1,78 @@
+From 1c779e83e5f78cadcd8dfc6cfca33e7aeb323f27 Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Thu, 17 Feb 2022 16:44:33 +0000
+Subject: [PATCH] media: i2c: ov7251: Limit exposure based on VTS
+
+The maximum exposure is dictated by VTS, so compute it rather
+than having the value in the mode table.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ drivers/media/i2c/ov7251.c | 14 ++++++--------
+ 1 file changed, 6 insertions(+), 8 deletions(-)
+
+--- a/drivers/media/i2c/ov7251.c
++++ b/drivers/media/i2c/ov7251.c
+@@ -37,6 +37,8 @@
+ #define OV7251_AEC_EXPO_2		0x3502
+ #define OV7251_AEC_AGC_ADJ_0		0x350a
+ #define OV7251_AEC_AGC_ADJ_1		0x350b
++/* Exposure must be at least 20 lines shorter than VTS */
++#define OV7251_EXPOSURE_OFFSET		20
+  /* HTS is registers 0x380c and 0x380d */
+ #define OV7251_HTS			0x3a0
+ #define OV7251_VTS_HIGH			0x380e
+@@ -82,7 +84,6 @@ struct ov7251_mode_info {
+ 	u32 height;
+ 	const struct reg_value *data;
+ 	u32 data_size;
+-	u16 exposure_max;
+ 	u16 exposure_def;
+ 	u16 vts;
+ 	struct v4l2_fract timeperframe;
+@@ -348,7 +349,6 @@ static const struct ov7251_mode_info ov7
+ 		.height = 480,
+ 		.data = ov7251_setting_vga,
+ 		.data_size = ARRAY_SIZE(ov7251_setting_vga),
+-		.exposure_max = 1704,
+ 		.exposure_def = 504,
+ 		.vts = 0x6bc,
+ 		.timeperframe = {
+@@ -361,7 +361,6 @@ static const struct ov7251_mode_info ov7
+ 		.height = 480,
+ 		.data = ov7251_setting_vga,
+ 		.data_size = ARRAY_SIZE(ov7251_setting_vga),
+-		.exposure_max = 840,
+ 		.exposure_def = 504,
+ 		.vts = 0x35c,
+ 		.timeperframe = {
+@@ -374,7 +373,6 @@ static const struct ov7251_mode_info ov7
+ 		.height = 480,
+ 		.data = ov7251_setting_vga,
+ 		.data_size = ARRAY_SIZE(ov7251_setting_vga),
+-		.exposure_max = 552,
+ 		.exposure_def = 504,
+ 		.vts = 0x23c,
+ 		.timeperframe = {
+@@ -915,8 +913,8 @@ static int ov7251_set_format(struct v4l2
+ 					 h_blank, 1, h_blank);
+ 		__v4l2_ctrl_s_ctrl(ov7251->hblank, h_blank);
+ 
+-		ret = __v4l2_ctrl_modify_range(ov7251->exposure,
+-					       1, new_mode->exposure_max,
++		ret = __v4l2_ctrl_modify_range(ov7251->exposure, 1,
++					       new_mode->vts - OV7251_EXPOSURE_OFFSET,
+ 					       1, new_mode->exposure_def);
+ 		if (ret < 0)
+ 			goto exit;
+@@ -1092,8 +1090,8 @@ static int ov7251_set_frame_interval(str
+ 	new_mode = ov7251_find_mode_by_ival(ov7251, &fi->interval);
+ 
+ 	if (new_mode != ov7251->current_mode) {
+-		ret = __v4l2_ctrl_modify_range(ov7251->exposure,
+-					       1, new_mode->exposure_max,
++		ret = __v4l2_ctrl_modify_range(ov7251->exposure, 1,
++					       new_mode->vts - OV7251_EXPOSURE_OFFSET,
+ 					       1, new_mode->exposure_def);
+ 		if (ret < 0)
+ 			goto exit;