From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: kernel@pengutronix.de, etnaviv@lists.freedesktop.org,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] drm/etnaviv: select CMA and DMA_CMA if available
Date: Sun, 16 Jul 2017 16:29:43 +0100 [thread overview]
Message-ID: <20170716152943.GH31807@n2100.armlinux.org.uk> (raw)
In-Reply-To: <20170714143801.21535-1-l.stach@pengutronix.de>
On Fri, Jul 14, 2017 at 04:38:01PM +0200, Lucas Stach wrote:
> While this is no build dependency, etnaviv will only work correctly on most
> systems if CMA and DMA_CMA are enabled. Select both options if available to
> avoid users ending up with a non-working GPU due to a lacking kernel config.
How does merely selecting CMA solve this problem? Does CMA guarantee
that GPU command buffers will always be allocated in the lower 2G of
physical address space?
I suspect that's what you hope will happen, rather than a guarantee.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
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next prev parent reply other threads:[~2017-07-16 15:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-14 14:38 [PATCH] drm/etnaviv: select CMA and DMA_CMA if available Lucas Stach
2017-07-14 18:32 ` Joshua Clayton
2017-07-17 8:52 ` Lucas Stach
2017-07-16 15:29 ` Russell King - ARM Linux [this message]
2017-07-17 8:49 ` Lucas Stach
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