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, 48 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.15/950-0675-media-i2c-ov9281-Initialize-id_msb-to-zero-in-ov9281.patch b/target/linux/bcm27xx/patches-5.15/950-0675-media-i2c-ov9281-Initialize-id_msb-to-zero-in-ov9281.patch
new file mode 100644
index 0000000000..c80323cdd1
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0675-media-i2c-ov9281-Initialize-id_msb-to-zero-in-ov9281.patch
@@ -0,0 +1,48 @@
+From 573172b7b51a5b955627bd3d0cde5b2d2c4f9441 Mon Sep 17 00:00:00 2001
+From: Nathan Chancellor <nathan@kernel.org>
+Date: Mon, 31 Jan 2022 17:50:43 -0700
+Subject: [PATCH] media: i2c: ov9281: Initialize id_msb to zero in
+ ov9281_check_sensor_id()
+
+Clang warns:
+
+  drivers/media/i2c/ov9281.c:1132:6: warning: variable 'id_msb' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
+          if (!ret)
+              ^~~~
+  drivers/media/i2c/ov9281.c:1135:9: note: uninitialized use occurs here
+          id |= (id_msb << 8);
+                 ^~~~~~
+  drivers/media/i2c/ov9281.c:1132:2: note: remove the 'if' if its condition is always true
+          if (!ret)
+          ^~~~~~~~~
+  drivers/media/i2c/ov9281.c:1127:20: note: initialize the variable 'id_msb' to silence this warning
+          u32 id = 0, id_msb;
+                            ^
+                             = 0
+  1 warning generated.
+
+If the first ov9281_read_reg() call fails, id_msb will be used
+uninitialized. However, this warning does not actually matter in
+practice because the value of id is not used when either call to
+ov9281_read_reg() fails, as the boolean OR will short circuit due to the
+ret condition being checked first. Regardless, it is not good to use
+variables uninitialized so silence the warning by initializing id_msb to
+0, as was done with id.
+
+Fixes: 20855581e0eb ("media: i2c: ov9281: Read chip ID via 2 reads")
+Signed-off-by: Nathan Chancellor <nathan@kernel.org>
+---
+ drivers/media/i2c/ov9281.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/media/i2c/ov9281.c
++++ b/drivers/media/i2c/ov9281.c
+@@ -1124,7 +1124,7 @@ static int ov9281_check_sensor_id(struct
+ 				  struct i2c_client *client)
+ {
+ 	struct device *dev = &ov9281->client->dev;
+-	u32 id = 0, id_msb;
++	u32 id = 0, id_msb = 0;
+ 	int ret;
+ 
+ 	ret = ov9281_read_reg(client, OV9281_REG_CHIP_ID + 1,