[PATCH] ALSA: hda/realtek: Add quirk for Lenovo Ideapad S740

[Pierre-Louis Bossart]

On 4/16/21 3:47 AM, Jaroslav Kysela wrote:
> Dne 16. 04. 21 v 10:12 Takashi Iwai napsal(a):
>> Lenovo Ideapad S740 requires quite a few COEF setups to make its
>> speakers working.  The verb table was provided from Ryan Prescott as
>> the result of investigation via qemu:
>>    https://github.com/ryanprescott/realtek-verb-tools/wiki/How-to-sniff-verbs-from-a-Windows-sound-driver
> 
> [Cc: to Kailang / Realtek]
> 
> I believe that this sequence contains I2C writes to amplifier chips. It would
> be really helpful, if Realtek can provide more information for the I2C master
> interface for their codecs (describe basic I2C I/O).

The biggest problem is to figure what address/value pairs to write with 
I2C into the amplifiers, and here the catch is that those I2C/I2S 
amplifiers may or may not be sourced from Realtek, and it'd be difficult 
for Realtek to provide documentation on their competition, wouldn't it?