From: Krzysztof Kozlowski <krzk@kernel.org>
To: Shuah Khan <shuahkh@osg.samsung.com>
Cc: inki.dae@samsung.com, linux-samsung-soc@vger.kernel.org,
arnd@arndb.de, cw00.choi@samsung.com, viresh.kumar@linaro.org,
rafael.j.wysocki@intel.com, robie@justgohome.co.uk,
linux@armlinux.org.uk, sw0312.kim@samsung.com,
linux-kernel@vger.kernel.org, a.hajda@samsung.com,
javier@osg.samsung.com, b.zolnierkie@samsung.com,
kgene@kernel.org, s.nawrocki@samsung.com, shuah@kernel.org,
linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com
Subject: Re: [PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE_MBYTES to 96
Date: Tue, 7 Mar 2017 21:03:17 +0200 [thread overview]
Message-ID: <20170307190317.5gbxy4nmj67tvimi@kozik-lap> (raw)
In-Reply-To: <20170228191221.18135-1-shuahkh@osg.samsung.com>
On Tue, Feb 28, 2017 at 12:12:21PM -0700, Shuah Khan wrote:
> Current CMA size of 64 Mbytes is right on the edge of being small when
> several drivers need to allocate large CMA buffers.
>
> For example, if the s5p-mfc driver needs to pre-allocate N MiB CMA memory
> to decode a H.264 1080p video, then there won't be enough CMA memory left
> for other drivers, such as the exynos-drm driver that may need to allocate
> GEM buffers for the display manager.
>
> Increasing CMA size to 96 Mbytes in exynos_defconfig addresses use-cases
> such as these.
>
> Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
> Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
> ---
>
> Changes since v1:
> Fix short and long commit log.
>
> Reason for this patch:
> With the proposed s5p_mfc patch series that pre-allocate buffers, when
> display manager starts, it fails to get GEM buffers. Increasing the CMA
> size to 96 solved the problem.
>
> arch/arm/configs/exynos_defconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
Thanks, applied with slightly changed commit msg.
Best regards,
Krzysztof
prev parent reply other threads:[~2017-03-07 19:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-28 19:12 [PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE_MBYTES to 96 Shuah Khan
2017-03-01 17:09 ` Krzysztof Kozlowski
2017-03-01 18:08 ` Shuah Khan
2017-03-01 18:49 ` Krzysztof Kozlowski
2017-03-07 19:03 ` Krzysztof Kozlowski [this message]
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