linux-kernel - Re: [PATCH v2 4/6] drm/panfrost: Add support for AARCH64

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Message-ID: <e217363f-5492-486e-8063-8e3eed047b00@collabora.com>
Date: Mon, 17 Mar 2025 09:49:49 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Ariel D'Alessandro <ariel.dalessandro@...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 v2 4/6] drm/panfrost: Add support for AARCH64_4K page
 table format

Il 14/03/25 18:38, Ariel D'Alessandro ha scritto:
> Currently, Panfrost only supports MMU configuration in "LEGACY" (as
> Bifrost calls it) mode, a (modified) version of LPAE "Large Physical
> Address Extension", which in Linux we've called "mali_lpae".
> 
> This commit adds support for conditionally enabling AARCH64_4K page
> table format. To achieve that, a "GPU optional quirks" field was added
> to `struct panfrost_features` with the related flag.
> 
> Note that, in order to enable AARCH64_4K mode, the GPU variant must have
> the HW_FEATURE_AARCH64_MMU feature flag present.
> 
> Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@...labora.com>

I would've preferred the LEGACY format to be a quirk, instead of AARCH64, but
okay.

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