linux/arch/arm64/include
Will Deacon c1132702c7 Revert "arm64: cache: Lower ARCH_DMA_MINALIGN to 64 (L1_CACHE_BYTES)"
This reverts commit 65688d2a05.

Unfortunately, the original Qualcomm Kryo cores integrated into the
MSM8996 SoC feature an L2 cache with 128-byte lines which sits above
the Point of Coherency. Consequently, we must restore ARCH_DMA_MINALIGN
to its former ugly self so that non-coherent DMA can be performed safely
on devices built using this SoC.

Thanks to Jeffrey Hugo for confirming this with a hardware designer.

Link: https://lore.kernel.org/r/CAOCk7NqdpUZFMSXfGjw0_1NaSK5gyTLgpS9kSdZn1jmBy-QkfA@mail.gmail.com/
Reported-by: Yassine Oudjana <y.oudjana@protonmail.com>
Link: https://lore.kernel.org/r/uHgsRacR8hJ7nW-I-pIcehzg-lNIn7NJvaL7bP9tfAftFsBjsgaY2qTjG9zyBgxHkjNL1WPNrD7YVv2JVD2_Wy-a5VTbcq-1xEi8ZnwrXBo=@protonmail.com
Signed-off-by: Will Deacon <will@kernel.org>
2021-07-12 13:37:34 +01:00
..
asm Revert "arm64: cache: Lower ARCH_DMA_MINALIGN to 64 (L1_CACHE_BYTES)" 2021-07-12 13:37:34 +01:00
uapi/asm arch, mm: wire up memfd_secret system call where relevant 2021-07-08 11:48:21 -07:00