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S24_LE is a 32-bit container with 24-bit data in LSBs, with zeroes in
most significant byte. S32_LE can act as 32-bit container for 24-bit
data where data is pushed to MSBs and zeroes are filled in least
significant byte. For example below is how the data is represented
for different containers, where 'abc' is 24-bit data.
0abc (S24_LE)
abc0 (S32_LE)
As per IAS, most significant bits are pushed first when data moves
in AHUB. For any down conversion LSBs are discarded, where as for any
up conversion, zeroes are filled in the LSBs. Hence extraction of
S24_LE results in data loss. Mentioned below are some of the examples
to illustrate this.
Consider for playback path, where data flow is from memory to AHUB and
its clients, where 'abc' is valid data and 'x' is to ignore.
* S32_LE
abc0 --> audio = 32, client = 32 --> abc0
abc0 --> audio = 32, client = 24 --> abcx
abc0 --> audio = 32, client = 16 --> abxx
* S24_LE
0abc --> audio = 32, client = 32 --> 0abc
0abc --> audio = 32, client = 24 --> 0abx (data loss)
0abc --> audio = 32, client = 16 --> 0axx (data loss)
Thus this patch removes S24_LE format from the drivers since Tegra audio
HW is not designed to support this. Also S24_LE is not a commonly used
format.
Bug 200568187
Change-Id: I778d2f70527c17f00728fce75fe152d902c5aaa0
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2264822
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Viswanath L <viswanathl@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sharad Gupta <sharadg@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>