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

From	Shuah Khan <shuahkh@osg.samsung.com>
Newsgroups	linux.kernel
Subject	[PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE_MBYTES to 96
Date	2017-03-01 03:40 +0100
Message-ID	<tg2lj-4F1-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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(-)

diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
index 742baf0..2541414 100644
--- a/arch/arm/configs/exynos_defconfig
+++ b/arch/arm/configs/exynos_defconfig
@@ -53,7 +53,7 @@ CONFIG_RFKILL_REGULATOR=y
 CONFIG_DEVTMPFS=y
 CONFIG_DEVTMPFS_MOUNT=y
 CONFIG_DMA_CMA=y
-CONFIG_CMA_SIZE_MBYTES=64
+CONFIG_CMA_SIZE_MBYTES=96
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_BLK_DEV_CRYPTOLOOP=y
 CONFIG_BLK_DEV_RAM=y
-- 
2.7.4

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[PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE_MBYTES to 96 Shuah Khan <shuahkh@osg.samsung.com> - 2017-03-01 03:40 +0100
  Re: [PATCH v2] ARM: exynos_defconfig: increase  CONFIG_CMA_SIZE_MBYTES to 96 Krzysztof Kozlowski <krzk@kernel.org> - 2017-03-01 18:10 +0100
    Re: [PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE_MBYTES  to 96 Shuah Khan <shuahkh@osg.samsung.com> - 2017-03-01 19:20 +0100
      Re: [PATCH v2] ARM: exynos_defconfig: increase  CONFIG_CMA_SIZE_MBYTES to 96 Krzysztof Kozlowski <krzk@kernel.org> - 2017-03-01 19:50 +0100
  Re: [PATCH v2] ARM: exynos_defconfig: increase  CONFIG_CMA_SIZE_MBYTES to 96 Krzysztof Kozlowski <krzk@kernel.org> - 2017-03-07 20:20 +0100

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