MIPS: Loongson64: Enable DMA noncoherent support

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commit edc0378eee upstream.

There are some Loongson64 systems come with broken coherent DMA
support, firmware will set a bit in boot_param and pass nocoherentio
in cmdline.

However nonconherent support was missed out when spin off Loongson-2EF
form Loongson64, and that boot_param change never made itself into
upstream.

Support DMA noncoherent properly to get those systems working.

Cc: stable@vger.kernel.org
Fixes: 71e2f4dd5a ("MIPS: Fork loongson2ef from loongson64")
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Jiaxun Yang 2023-11-07 11:15:19 +00:00 • committed by Greg Kroah-Hartman

parent d52a5178cb

commit b4e440cf60

3 changed files with 13 additions and 2 deletions

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2

arch/mips/Kconfig

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3

arch/mips/include/asm/mach-loongson64/boot_param.h

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10

arch/mips/loongson64/env.c

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