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

Krzysztof Kozlowski krzk at kernel.org
Tue Mar 7 11:03:17 PST 2017

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 at samsung.com>
> Signed-off-by: Shuah Khan <shuahkh at osg.samsung.com>
> Reviewed-by: Javier Martinez Canillas <javier at 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,

More information about the linux-arm-kernel mailing list