linux-kernel - Re: [PATCH 3/3] drm/etnaviv: use a 32 bit mask as coherent DMA mask

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Message-ID: <732be3deb2a29b9d9e274ee543fa3b89@walle.cc>
Date:   Thu, 26 Aug 2021 14:43:26 +0200
From:   Michael Walle <michael@...le.cc>
To:     etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     "Lukas F . Hartmann" <lukas@...re.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH 3/3] drm/etnaviv: use a 32 bit mask as coherent DMA mask

Am 2021-08-26 14:10, schrieb Michael Walle:
> The STLB and the first command buffer (which is used to set up the 
> TLBs)
> has a 32 bit size restriction in hardware. There seems to be no way to
> specify addresses larger than 32 bit. Keep it simple and restict the
> addresses to the lower 4 GiB range for all coherent DMA memory
> allocations.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>

Suggested-by: Lucas Stach <l.stach@...gutronix.de>

is missing here. sorry, will add it in the next version.

-michael