linux-kernel - Re: [PATCH] drm/bridge: lt9211: Convert to use maple tree register cache

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Message-ID: <033469a4-1f16-4be9-8e97-5646d66b9fae@linaro.org>
Date:   Mon, 2 Oct 2023 09:02:27 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Mark Brown <broonie@...nel.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: lt9211: Convert to use maple tree register
 cache

On 01/10/2023 12:24, 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.
> 
> Signed-off-by: Mark Brown <broonie@...nel.org>
> ---
>   drivers/gpu/drm/bridge/lontium-lt9211.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9211.c b/drivers/gpu/drm/bridge/lontium-lt9211.c
> index 4d404f5ef87e..c8881796fba4 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9211.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9211.c
> @@ -89,7 +89,7 @@ static const struct regmap_config lt9211_regmap_config = {
>   	.volatile_table	= &lt9211_rw_table,
>   	.ranges = &lt9211_range,
>   	.num_ranges = 1,
> -	.cache_type = REGCACHE_RBTREE,
> +	.cache_type = REGCACHE_MAPLE,
>   	.max_register = 0xda00,
>   };
>   
> 
> ---
> base-commit: 6465e260f48790807eef06b583b38ca9789b6072
> change-id: 20230929-drm-lt9211-maple-f2b0807acd53
> 
> Best regards,

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>