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, 60 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0645-media-i2c-ov9281-Increase-diff-between-VTS-and-max-e.patch b/target/linux/bcm27xx/patches-5.15/950-0645-media-i2c-ov9281-Increase-diff-between-VTS-and-max-e.patch
new file mode 100644
index 0000000000..cc4928f4ef
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0645-media-i2c-ov9281-Increase-diff-between-VTS-and-max-e.patch
@@ -0,0 +1,60 @@
+From 0f60668a144d9bb7e9f313c389d078fd9e3befe2 Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Tue, 4 Jan 2022 14:46:01 +0000
+Subject: [PATCH] media: i2c: ov9281: Increase diff between VTS and max
+ exposure
+
+The driver did allow the exposure to go up to VTS - 4 lines,
+but this would produce a visible line on 1280x800, and a stall of
+the sensor at 640x480.
+
+Whilst it appears to work with a difference of 5, the datasheet states
+there should be at least 25 lines difference between VTS and exposure,
+so use that value.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ drivers/media/i2c/ov9281.c | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+--- a/drivers/media/i2c/ov9281.c
++++ b/drivers/media/i2c/ov9281.c
+@@ -52,7 +52,11 @@
+ #define OV9281_REG_EXPOSURE		0x3500
+ #define	OV9281_EXPOSURE_MIN		4
+ #define	OV9281_EXPOSURE_STEP		1
+-#define OV9281_VTS_MAX			0x7fff
++/*
++ * Number of lines less than frame length (VTS) that exposure must be.
++ * Datasheet states 25, although empirically 5 appears to work.
++ */
++#define OV9281_EXPOSURE_OFFSET		25
+ 
+ #define OV9281_REG_GAIN_H		0x3508
+ #define OV9281_REG_GAIN_L		0x3509
+@@ -69,6 +73,7 @@
+ #define OV9281_TEST_PATTERN_DISABLE	0x0
+ 
+ #define OV9281_REG_VTS			0x380e
++#define OV9281_VTS_MAX			0x7fff
+ 
+ /*
+  * OV9281 native and active pixel array size.
+@@ -967,7 +972,7 @@ static int ov9281_set_ctrl(struct v4l2_c
+ 	switch (ctrl->id) {
+ 	case V4L2_CID_VBLANK:
+ 		/* Update max exposure while meeting expected vblanking */
+-		max = ov9281->cur_mode->height + ctrl->val - 4;
++		max = ov9281->cur_mode->height + ctrl->val - OV9281_EXPOSURE_OFFSET;
+ 		__v4l2_ctrl_modify_range(ov9281->exposure,
+ 					 ov9281->exposure->minimum, max,
+ 					 ov9281->exposure->step,
+@@ -1062,7 +1067,7 @@ static int ov9281_initialize_controls(st
+ 					   OV9281_VTS_MAX - mode->height, 1,
+ 					   vblank_def);
+ 
+-	exposure_max = mode->vts_def - 4;
++	exposure_max = mode->vts_def - OV9281_EXPOSURE_OFFSET;
+ 	ov9281->exposure = v4l2_ctrl_new_std(handler, &ov9281_ctrl_ops,
+ 					     V4L2_CID_EXPOSURE,
+ 					     OV9281_EXPOSURE_MIN, exposure_max,