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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2023-03-31 10:12:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-03-31 10:12:07 -0700 |
| commit | 52f1959502dec5069dcd247ce0462cdc608494b1 (patch) | |
| tree | 73cc5930ea87537849dd864e9e0d9a57ed94f928 | |
| parent | Merge tag 'dma-mapping-6.3-2023-03-31' of git://git.infradead.org/users/hch/dma-mapping (diff) | |
| parent | mips: bmips: BCM6358: disable RAC flush for TP1 (diff) | |
| download | wireguard-linux-52f1959502dec5069dcd247ce0462cdc608494b1.tar.xz wireguard-linux-52f1959502dec5069dcd247ce0462cdc608494b1.zip | |
Merge tag 'mips-fixes_6.3_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Pull MIPS fix from Thomas Bogendoerfer:
"Fix to avoid crash on BCM6358 platforms"
* tag 'mips-fixes_6.3_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
mips: bmips: BCM6358: disable RAC flush for TP1
| -rw-r--r-- | arch/mips/bmips/dma.c | 5 | ||||
| -rw-r--r-- | arch/mips/bmips/setup.c | 8 |
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/mips/bmips/dma.c b/arch/mips/bmips/dma.c index 33788668cbdb..3779e7855bd7 100644 --- a/arch/mips/bmips/dma.c +++ b/arch/mips/bmips/dma.c @@ -5,6 +5,8 @@ #include <asm/bmips.h> #include <asm/io.h> +bool bmips_rac_flush_disable; + void arch_sync_dma_for_cpu_all(void) { void __iomem *cbr = BMIPS_GET_CBR(); @@ -15,6 +17,9 @@ void arch_sync_dma_for_cpu_all(void) boot_cpu_type() != CPU_BMIPS4380) return; + if (unlikely(bmips_rac_flush_disable)) + return; + /* Flush stale data out of the readahead cache */ cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG); __raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG); diff --git a/arch/mips/bmips/setup.c b/arch/mips/bmips/setup.c index e95b3f78e7cd..549a6392a3d2 100644 --- a/arch/mips/bmips/setup.c +++ b/arch/mips/bmips/setup.c @@ -35,6 +35,8 @@ #define REG_BCM6328_OTP ((void __iomem *)CKSEG1ADDR(0x1000062c)) #define BCM6328_TP1_DISABLED BIT(9) +extern bool bmips_rac_flush_disable; + static const unsigned long kbase = VMLINUX_LOAD_ADDRESS & 0xfff00000; struct bmips_quirk { @@ -104,6 +106,12 @@ static void bcm6358_quirks(void) * disable SMP for now */ bmips_smp_enabled = 0; + + /* + * RAC flush causes kernel panics on BCM6358 when booting from TP1 + * because the bootloader is not initializing it properly. + */ + bmips_rac_flush_disable = !!(read_c0_brcm_cmt_local() & (1 << 31)); } static void bcm6368_quirks(void) |