Re: [PATCH] regmap: maple: Don't sync read-only registers

[Mark Brown]

On Tue, Jun 13, 2023 at 09:45:11AM +0200, Takashi Iwai wrote:
> regcache_maple_sync() tries to sync all cached values no matter
> whether it's writable or not.  OTOH, regache_sync_val() does care the
> wrtability and returns -EIO for a read-only register.  This results in
> an error message like:
>   snd_hda_codec_realtek hdaudioC0D0: Unable to sync register 0x2f0009. -5
> and the sync loop is aborted incompletely.
> 
> This patch adds the writable register check in the loop for addressing
> the bug.

This should be in _needs_sync().

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