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ASoC: tegra-alt: Fix restoration of mixer controls

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When using the ALSA 'alsactl' tool to save and restore mixer settings
the following type of errors are observed ...

alsactl: set_control:1461: Cannot write control '2:0:0:ADMAIF1 Channels:0' : Invalid argument
...
alsactl: set_control:1461: Cannot write control '2:0:0:AMX1 Output Channels:0' : Invalid argument
...
alsactl: set_control:1461: Cannot write control '2:0:0:RX1 Channels:0' : Invalid argument
...
alsactl: set_control:1461: Cannot write control '2:0:0:TX1 Channels:0' : Invalid argument
...
alsactl: set_control:1461: Cannot write control '2:0:0:TX5 Channels:0' : Invalid argument
...
alsactl: set_control:1461: Cannot write control '2:0:0:SFC1 Channels:0' : Invalid argument
...
alsactl: set_control:1461: Cannot write control '2:0:0:MVC1 Bits:0' : Invalid argument

These are just a few examples but these errors are seen for all
instances of the devices. The problem is that the 'put' handler for
the above mixer controls treats '0' as an invalid setting and so if
the default value is '0', then when we try to restore the setting to
'0' it fails because this is consider an 'invalid argument'. However,
'0' is not a invalid argument, it simply means that we are not
overriding this setting from userspace.

Furthermore, if someone happens to set an of the above mixer controls
to a non-zero value, then it is not possible to set it back to '0'
again.

Fix this by allowing userspace to set the above mixer controls to '0'.

Bug 2058979

Change-Id: Icd543c2ea956cb0690238d9a1f184c144a572029
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1675098
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Jon Hunter
2018-03-12 13:55:01 +00:00
committed by Sameer Pujar
parent 04f1ad23f1
commit f0ebf9d9c4
5 changed files with 12 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
sound/soc/tegra-alt/tegra210_mvc_alt.c
View File

@@ -1,7 +1,7 @@
/*
* tegra210_mvc_alt.c - Tegra210 MVC driver
*
* Copyright (c) 2014-2017 NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2014-2018 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,
@@ -304,6 +304,8 @@ static int tegra210_mvc_put_audio_bits(struct snd_kcontrol *kcontrol,
val = ucontrol->value.integer.value[0];
if ((val >= 8) && (val <= 32) && (val%4 == 0))
mvc->audio_bits = val/4 - 1;
else if (val == 0)
mvc->audio_bits = 0;
else
return -EINVAL;