In RV32, udelay would delay the wrong cycle.
When it shifts right "UDELAY_SHITFT" bits, it
either delays 0 cycle or 1 cycle. It only works
correctly in RV64. Because the 'ucycles' always
needs to be 64 bits variable.
Signed-off-by: Nick Hu <nic...@andestech.com>
---
arch/riscv/lib/delay.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/lib/delay.c b/arch/riscv/lib/delay.c
index dce8ae24c6d3..da847f49fb74 100644
--- a/arch/riscv/lib/delay.c
+++ b/arch/riscv/lib/delay.c
@@ -88,7 +88,7 @@ EXPORT_SYMBOL(__delay);
void udelay(unsigned long usecs)
{
- unsigned long ucycles = usecs * lpj_fine * UDELAY_MULT;
+ unsigned long long ucycles = (unsigned long long)usecs * lpj_fine *
UDELAY_MULT;
if (unlikely(usecs > MAX_UDELAY_US)) {
__delay((u64)usecs * riscv_timebase / 1000000ULL);
--
2.17.0
