drivers: media: gmsl sensor flexi connections

Enable splitter mode only if more than one devices
said to be attached.

Consider sensor device does not exist, if serializer
fails to communicate on newly assigned proxy slave.
Also skip sensor probe in this case, to avoid
creating false dev node.

Reset to active gmsl link if all source devices are
not physically connected.

This enables support for all combinations of sensor
connections for streaming, i.e. dual or link-A only or
link-B only.

Use max_src instead of num_src during boot, since
num_src only reflects the number of devices
registered so far. Keep using num_src for streaming
sequence.

Some trivial fixes.

Bug 2838597

Change-Id: Ia5624906191cca3b4d30405d0ffba899eba95da6
Signed-off-by: Sudhir Vyas <svyas@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2299611
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Frank Chen <frankc@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

2 files changed, 4 insertions, 3 deletions

diff --git a/include/media/gmsl-link.h b/include/media/gmsl-link.h
index 79cef63fe..94df6bf3f 100644
--- a/include/media/gmsl-link.h
+++ b/include/media/gmsl-link.h
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2018-2019, NVIDIA Corporation.  All rights reserved.
+ * Copyright (c) 2018-2020, NVIDIA Corporation.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -59,6 +59,7 @@ struct gmsl_link_ctx {
         __u32 ser_reg;
         __u32 sdev_reg;
         __u32 sdev_def;
+        bool serdev_found;
         struct gmsl_stream streams[GMSL_DEV_MAX_NUM_DATA_STREAMS];
         struct device *s_dev;
 };
diff --git a/include/media/max9296.h b/include/media/max9296.h
index ffc8eae0e..014af0af2 100644
--- a/include/media/max9296.h
+++ b/include/media/max9296.h
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2018-2019, NVIDIA Corporation.  All rights reserved.
+ * Copyright (c) 2018-2020, NVIDIA Corporation.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -21,7 +21,7 @@
 
 int max9296_setup_link(struct device *dev, struct device *s_dev);
 
-int max9296_setup_control(struct device *dev);
+int max9296_setup_control(struct device *dev, struct device *s_dev);
 
 int max9296_reset_control(struct device *dev, struct device *s_dev);