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Message-ID: <87ilbrejlm.wl-tiwai@suse.de>
Date: Tue, 13 Jun 2023 12:34:45 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Mark Brown <broonie@...nel.org>
Cc: linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH] regmap: maple: Don't sync read-only registers
On Tue, 13 Jun 2023 12:16:37 +0200,
Mark Brown wrote:
>
> 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().
I thought it's a different logic? regacahe_reg_needs_sync() checks
only whether it's a default value, and other call paths already check
regmap_writeable().
But I can put the check there instead if you still prefer, too.
thanks,
Takashi
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