Bug#940726: linux-source-5.2: Enable SOF audio driver and back-port fixes required to 5.2 kernel

[David Ward <david.ward@ll.mit.edu>]

On 11/10/19 1:05 PM, David Ward wrote:
> Unfortunately, this has caused a regression. The SST and SOF drivers 
> cannot both be enabled for the same Intel platform in the kernel 
> configuration, according to Intel. 
> https://bugzilla.kernel.org/show_bug.cgi?id=204237#c15

To clarify, the statement above applies to the Baytrail and Broadwell 
platforms (only).


These lines that were just added in debian/config/amd64/config need to 
be removed:

   CONFIG_SND_SOC_SOF_BAYTRAIL_SUPPORT=y
   CONFIG_SND_SOC_SOF_BROADWELL_SUPPORT=y

This will be enforced via Kconfig beginning in Linux 5.5-rc1:

   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=df7257e544faf838c3e7ad6b4e89ffe59e87f5e1
   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=a6955fe0e2309feeab5ec71e4b0dcbe498f4f497


The SOF drivers/firmware for the Broadwell and Baytrail platforms have 
issues, and Intel does not consider them ready for use in distributions yet:
https://github.com/thesofproject/linux/pull/1382#discussion_r344755772


Thank you.