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mmc: mtk-sd: select LMB_LIMIT_DMA_BELOW_RAM_TOP

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Default to CONFIG_LMB_LIMIT_DMA_BELOW_RAM_TOP=y when CONFIG_MTK_SD is
enabled. The MediaTek SD controller can only access the first 4GB of RAM
when DMA is used. "imply" is used rather than "select" in case someone
want's to turn off the option when DMA is not used.

Link: https://patch.msgid.link/20260615-mtk-fix-ram-size-v2-1-f72cfc52ce58@baylibre.com
Signed-off-by: David Lechner <dlechner@baylibre.com>
This commit is contained in:
David Lechner
2026-06-24 10:06:16 -05:00
parent 7aedd1f7fb
commit ae73cc6df7
1 changed files with 1 additions and 0 deletions
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drivers/mmc/Kconfig
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@@ -858,6 +858,7 @@ config MMC_MTK
bool "MediaTek SD/MMC Card Interface support"
depends on ARCH_MEDIATEK || ARCH_MTMIPS || ARCH_AIROHA
depends on OF_CONTROL
imply LMB_LIMIT_DMA_BELOW_RAM_TOP
help
This selects the MediaTek(R) Secure digital and Multimedia card Interface.
If you have a machine with a integrated SD/MMC card reader, say Y here.