linux-kernel - [PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE

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Date:   Tue, 28 Feb 2017 12:12:21 -0700
From:   Shuah Khan <shuahkh@....samsung.com>
To:     linux@...linux.org.uk, kgene@...nel.org, krzk@...nel.org,
        javier@....samsung.com, arnd@...db.de, cw00.choi@...sung.com,
        rafael.j.wysocki@...el.com, robie@...tgohome.co.uk,
        b.zolnierkie@...sung.com, viresh.kumar@...aro.org,
        m.szyprowski@...sung.com, s.nawrocki@...sung.com,
        a.hajda@...sung.com, inki.dae@...sung.com, sw0312.kim@...sung.com
Cc:     Shuah Khan <shuahkh@....samsung.com>, shuah@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] ARM: exynos_defconfig: increase CONFIG_CMA_SIZE_MBYTES to 96

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@...sung.com>
Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@....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