linux-kernel - Re: [PATCH] ASoC: Intel: Skylake: Add alternative topology binary name

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Date:   Wed, 4 Nov 2020 12:46:36 +0100
From:   "Gorski, Mateusz" <mateusz.gorski@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, cezary.rojewski@...el.com,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] ASoC: Intel: Skylake: Add alternative topology binary
 name


>> [ Upstream commit 1b290ef023b3eeb4f4688b582fecb773915ef937 ]
>>
>> Add alternative topology binary file name based on used machine driver
>> and fallback to use this name after failed attempt to load topology file
>> with name based on NHLT.
>> This change addresses multiple issues with current mechanism, for
>> example - there are devices without NHLT table, and that currently
>> results in tplg_name being empty.
>>
>> Signed-off-by: Mateusz Gorski <mateusz.gorski@...ux.intel.com>
>> Reviewed-by: Cezary Rojewski <cezary.rojewski@...el.com>
>> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>> Link: https://lore.kernel.org/r/20200427132727.24942-2-mateusz.gorski@linux.intel.com
>> Signed-off-by: Mark Brown <broonie@...nel.org>
>> ---
>>
>> This functionality is merged on upstream kernel and widely used. Merging
>> it to LTS kernel would improve the user experience and resolve some of the
>> problems regarding topology naming that the users are facing.
> What problems are people facing, and what kernel(s) are you asking for
> this to be ported to, and why can't people just use 5.8 or newer if they
> have this new hardware?
>
> thanks,
>
> greg k-h

I forgot to add - I wanted this change to be merged to stable 5.4 
kernel. Please let me know if I should resend this patch with this 
information included.

As for the user issues - topology binary file name is currently created 
according to information from NHLT. The problem is, that some laptops 
(for example Dell XPS 13) do not have NHLT at all. This results in 
topology binary name being empty (" ").
This patch adds alternative name based on loaded machine driver.

It applies not only to new hardware, please note that the mentioned Dell 
XPS 13 is based on Kabylake. This issue existed on upstream from the 
beginning of Skylake driver and was only recently addressed.