linux-kernel - Re: [PATCH 08/11] mfd: wm5110: Update to use maple tree register cache

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Date:   Tue, 18 Jul 2023 15:42:00 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Richard Fitzgerald <rf@...nsource.cirrus.com>,
        Lee Jones <lee@...nel.org>, <alsa-devel@...a-project.org>,
        <patches@...nsource.cirrus.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/11] mfd: wm5110: Update to use maple tree register
 cache

On Thu, Jul 13, 2023 at 01:49:26AM +0100, Mark Brown wrote:
> The maple tree register cache is based on a much more modern data structure
> than the rbtree cache and makes optimisation choices which are probably
> more appropriate for modern systems than those made by the rbtree cache. In
> v6.5 it has also acquired the ability to generate multi-register writes in
> sync operations, bringing performance up to parity with the rbtree cache
> there.
> 
> Update the wm5110 driver to use the more modern data structure.
> 
> Signed-off-by: Mark Brown <broonie@...nel.org>
> ---
>  drivers/mfd/wm5110-tables.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/wm5110-tables.c b/drivers/mfd/wm5110-tables.c
> index 65b9b1d6daec..eba324875afd 100644
> --- a/drivers/mfd/wm5110-tables.c
> +++ b/drivers/mfd/wm5110-tables.c
> @@ -3218,7 +3218,7 @@ const struct regmap_config wm5110_i2c_regmap = {
>  	.readable_reg = wm5110_readable_register,
>  	.volatile_reg = wm5110_volatile_register,
>  
> -	.cache_type = REGCACHE_RBTREE,
> +	.cache_type = REGCACHE_MAPLE,
>  	.reg_defaults = wm5110_reg_default,
>  	.num_reg_defaults = ARRAY_SIZE(wm5110_reg_default),
>  };
> 
> -- 
> 2.39.2
> 

This one appears to cause me some issues, seems to get the IRQs
into a weird state when doing compressed stream stuff. The
issue seems to also require commit bfa0b38c1483 ("regmap:
maple: Implement block sync for the maple tree cache") to be
present. So it definitely seems to relate to the cache sync,
but not sure if it is something todo with the device itself,
or the maple tree stuff yet.

Thanks,
Charles