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-5.15/950-0637-media-v4l2-ctrls-Document-V4L2_CID_NOTIFY_GAINS-cont.patch b/target/linux/bcm27xx/patches-5.15/950-0637-media-v4l2-ctrls-Document-V4L2_CID_NOTIFY_GAINS-cont.patch
new file mode 100644
index 0000000000..55a2a4ef22
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0637-media-v4l2-ctrls-Document-V4L2_CID_NOTIFY_GAINS-cont.patch
@@ -0,0 +1,48 @@
+From dd91fe58de578570d49fe644eb05398a27510478 Mon Sep 17 00:00:00 2001
+From: David Plowman <david.plowman@raspberrypi.com>
+Date: Mon, 16 Aug 2021 13:39:09 +0200
+Subject: [PATCH] media: v4l2-ctrls: Document V4L2_CID_NOTIFY_GAINS
+ control
+
+commit 311a839a1ad255ebcb7291fb4e0d2ec2f32312a7 upstream.
+
+Add documentation for the V4L2_CID_NOTIFY_GAINS control.
+
+This control is required by sensors that need to know what colour
+gains will be applied to pixels by downstream processing (such as by
+an ISP), though the sensor does not apply these gains itself.
+
+Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
+Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
+Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
+---
+ .../media/v4l/ext-ctrls-image-source.rst      | 20 +++++++++++++++++++
+ 1 file changed, 20 insertions(+)
+
+--- a/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst
++++ b/Documentation/userspace-api/media/v4l/ext-ctrls-image-source.rst
+@@ -72,3 +72,23 @@ Image Source Control IDs
+     * - __u32
+       - ``height``
+       - Height of the area.
++
++``V4L2_CID_NOTIFY_GAINS (integer array)``
++    The sensor is notified what gains will be applied to the different
++    colour channels by subsequent processing (such as by an ISP). The
++    sensor is merely informed of these values in case it performs
++    processing that requires them, but it does not apply them itself to
++    the output pixels.
++
++    Currently it is defined only for Bayer sensors, and is an array
++    control taking 4 gain values, being the gains for each of the
++    Bayer channels. The gains are always in the order B, Gb, Gr and R,
++    irrespective of the exact Bayer order of the sensor itself.
++
++    The use of an array allows this control to be extended to sensors
++    with, for example, non-Bayer CFAs (colour filter arrays).
++
++    The units for the gain values are linear, with the default value
++    representing a gain of exactly 1.0. For example, if this default value
++    is reported as being (say) 128, then a value of 192 would represent
++    a gain of exactly 1.5.