media: tegra: camera: vi2: locking for vi recover

Introduce rwsem for the locking between vi/csi recover call and
the capture thread to avoid vi/csi register accesses during vi
reset.

Bug 200486098

Change-Id: I9a6b643708bec9db739ecd1e0607fe56713b00fb
Signed-off-by: Ken Chang <kenc@nvidia.com>
(cherry picked from commit 04765fae230bc8f7c4ae6908c7f934a4056000ae)
Reviewed-on: https://git-master.nvidia.com/r/2097524
(cherry picked from commit 8e4c60d8b7ff81b817226cad1a6fd82ffaeba623)
(cherry picked from commit 0313cd0998849973041daa78f57917504cf669b6)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2309291
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/media/mc_common.h b/include/media/mc_common.h
index 131087d32..c966cbd1c 100644
--- a/include/media/mc_common.h
+++ b/include/media/mc_common.h
@@ -33,6 +33,7 @@
 #include <media/csi.h>
 #include <linux/workqueue.h>
 #include <linux/semaphore.h>
+#include <linux/rwsem.h>
 
 #define MAX_FORMAT_NUM  64
 #define MAX_SUBDEVICES  4
@@ -262,6 +263,7 @@ struct tegra_channel {
         int interlace_bplfactor;
 
         atomic_t syncpt_depth;
+        struct rw_semaphore reset_lock;
 };
 
 #define to_tegra_channel(vdev) \