From de5758394b0ea66dc7fb3afbec88ea68dc0f5b2e Mon Sep 17 00:00:00 2001
From: henryhsu <henryhsu@chromium.org>
Date: Thu, 20 Aug 2015 17:57:58 +0800
Subject: [PATCH] [media] v4l: Add pixelformat change event

This event indicates that the video device has encountered a
pixelformat change during runtime. This event can be detected by a
decoder or a capture device.

Take decoder for example, input pixelformat change may affect
output format change.
This needs to be notified to the userspace and the application must
be expected to get format and reallocate buffers before proceeding.
If multiple events occurred before application could dequeue them,
then the changes will have the ORed value of all the events generated.

BUG=chromium:426383
TEST=build kernel and pass

Change-Id: Idb3f74adb662a4f897fb4323ab72e162d063f76a
Signed-off-by: Henry-Ruey Hsu <henryhsu@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/294147
Commit-Ready: Heng-ruey Hsu <henryhsu@chromium.org>
Tested-by: Heng-ruey Hsu <henryhsu@chromium.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
---

--- include/uapi/linux/videodev2.h	2015-08-20 18:34:10.172340830 +0800
+++ include/uapi/linux/videodev2.h	2015-08-20 18:34:12.744312208 +0800
@@ -1982,6 +1982,7 @@
 };
 
 #define V4L2_EVENT_SRC_CH_RESOLUTION		(1 << 0)
+#define V4L2_EVENT_SRC_CH_PIXELFORMAT		(1 << 1)
 
 struct v4l2_event_src_change {
 	__u32 changes;