diff options
| author | Jiaxun Yang <jiaxun.yang@flygoat.com> | 2023-11-07 12:15:19 +0100 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2023-12-05 18:45:14 +0100 |
| commit | edc0378eee00200a5bedf1bb9f00ad390e0d1bd4 (patch) | |
| tree | 0d0539507e82749c8fd741681e51fc09f94a67f9 /arch/mips/loongson64 | |
| parent | MIPS: Loongson64: Reserve vgabios memory on boot (diff) | |
| download | linux-edc0378eee00200a5bedf1bb9f00ad390e0d1bd4.tar.xz linux-edc0378eee00200a5bedf1bb9f00ad390e0d1bd4.zip | |
MIPS: Loongson64: Enable DMA noncoherent support
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: 71e2f4dd5a65 ("MIPS: Fork loongson2ef from loongson64")
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/loongson64')
| -rw-r--r-- | arch/mips/loongson64/env.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/mips/loongson64/env.c b/arch/mips/loongson64/env.c index c961e2999f15..ef3750a6ffac 100644 --- a/arch/mips/loongson64/env.c +++ b/arch/mips/loongson64/env.c @@ -13,6 +13,8 @@ * Copyright (C) 2009 Lemote Inc. * Author: Wu Zhangjin, wuzhangjin@gmail.com */ + +#include <linux/dma-map-ops.h> #include <linux/export.h> #include <linux/pci_ids.h> #include <asm/bootinfo.h> @@ -147,8 +149,14 @@ void __init prom_lefi_init_env(void) loongson_sysconf.dma_mask_bits = eirq_source->dma_mask_bits; if (loongson_sysconf.dma_mask_bits < 32 || - loongson_sysconf.dma_mask_bits > 64) + loongson_sysconf.dma_mask_bits > 64) { loongson_sysconf.dma_mask_bits = 32; + dma_default_coherent = true; + } else { + dma_default_coherent = !eirq_source->dma_noncoherent; + } + + pr_info("Firmware: Coherent DMA: %s\n", dma_default_coherent ? "on" : "off"); loongson_sysconf.restart_addr = boot_p->reset_system.ResetWarm; loongson_sysconf.poweroff_addr = boot_p->reset_system.Shutdown; |