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Re: [PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE_MBYTES to 96

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  Re: [PATCH v2] ARM: exynos_defconfig: increase  CONFIG_CMA_SIZE_MBYTES to 96 Krzysztof Kozlowski <krzk@kernel.org> - 2017-03-07 20:20 +0100

#1594559 — Re: [PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE_MBYTES to 96

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

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