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| author |   Paul Cercueil <paul@crapouillou.net> | 2021-05-30 18:17:55 +0100 |
|---|---|---|
| committer |   Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2021-06-01 11:44:46 +0200 |
| commit | 1660710cf5d8d44ec351a5df57c35516f1fbf5e0 (patch) | |
| tree | 591624fadbf915c66cef78f5afc7d5c35ae4833c /arch/mips/mm | |
| parent | mips: syscalls: use pattern rules to generate syscall headers (diff) | |
| download | linux-dev-1660710cf5d8d44ec351a5df57c35516f1fbf5e0.tar.xz linux-dev-1660710cf5d8d44ec351a5df57c35516f1fbf5e0.zip | |
MIPS: mm: XBurst CPU requires sync after DMA
I am not sure why this is required, but if this is not enabled, reading
from a buffer in which data has been DMA'd may read incorrect values.
This used to happen for instance in mmc_app_send_scr()
(drivers/mmc/core/sd_ops.c), where data is DMA'd to a buffer then copied
by the CPU to a different location.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/mm')
| -rw-r--r-- | arch/mips/mm/dma-noncoherent.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c index 212f3ce75a6b..3c4fc97b9f39 100644 --- a/arch/mips/mm/dma-noncoherent.c +++ b/arch/mips/mm/dma-noncoherent.c @@ -32,6 +32,7 @@ static inline bool cpu_needs_post_dma_flush(void) case CPU_R12000: case CPU_BMIPS5000: case CPU_LOONGSON2EF: + case CPU_XBURST: return true; default: /* |