linux-kernel - Re: [PATCH v1 5/6] drm/panfrost: Enable AARCH64_4K page table format on mediatek

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Message-ID: <2c82edc7-fd39-4e81-95b5-f43467fd166f@collabora.com>
Date: Fri, 14 Mar 2025 13:09:17 -0300
From: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: boris.brezillon@...labora.com, robh@...nel.org, steven.price@....com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.com, simona@...ll.ch, kernel@...labora.com,
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 sjoerd@...labora.com
Subject: Re: [PATCH v1 5/6] drm/panfrost: Enable AARCH64_4K page table format
 on mediatek_mt8188

Angelo,

On 3/11/25 6:09 AM, AngeloGioacchino Del Regno wrote:
> Il 10/03/25 20:59, Ariel D'Alessandro ha scritto:
>> Now that Panfrost supports AARCH64_4K page table format, let's enable it
>> on Mediatek MT8188.
>>
>> Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
>> ---
>>   drivers/gpu/drm/panfrost/panfrost_drv.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/ 
>> drm/panfrost/panfrost_drv.c
>> index 0f3935556ac76..d7b8bded6d784 100644
>> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
>> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
>> @@ -824,6 +824,7 @@ static const struct panfrost_compatible 
>> mediatek_mt8188_data = {
>>       .num_pm_domains = ARRAY_SIZE(mediatek_mt8183_pm_domains),
>>       .pm_domain_names = mediatek_mt8183_pm_domains,
>>       .pm_features = BIT(GPU_PM_CLK_DIS) | BIT(GPU_PM_VREG_OFF),
>> +    .gpu_configs = BIT(GPU_CONFIG_AARCH64_4K),
>>   };
>>   static const char * const mediatek_mt8192_supplies[] = { "mali", 
>> NULL };
> 
> Didn't that work on MT8195/8395 as well? I also recall hearing that it 
> was somewhat
> giving ever-so-slightly better performance?

Running glmark2-es2-drm [0] benchmark, reported the same performance 
("glmark2 Score") on both configurations, before and after this 
patchset. Tested on a Mediatek Genio 1200 EVK board.

To avoid holding this longer, I'll add it to patchset v2, and let's 
continue discussion there in any case.

[0] https://github.com/glmark2/glmark2

> 
> If it does, please enable it on 8195 as well :-)
> 
> also s/mediatek_mt8188/MediaTek MT8188/g

Ack.

> 
> ...and btw
> Reviewed-by: AngeloGioacchino Del Regno 
> <angelogioacchino.delregno@...labora.com>

Thanks!

-- 
Ariel D'Alessandro
Software Engineer

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