From d0e1f2110a5eeb6e410b2dd37d98bc5b30da7bc7 Mon Sep 17 00:00:00 2001 From: Nick Hu Date: Thu, 30 May 2019 15:01:17 +0800 Subject: riscv: Fix udelay in RV32. In RV32, udelay would delay the wrong cycle. When it shifts right "UDELAY_SHIFT" 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 Reviewed-by: Palmer Dabbelt [paul.walmsley@sifive.com: fixed minor spelling error] Signed-off-by: Paul Walmsley --- arch/riscv/lib/delay.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/riscv/lib') diff --git a/arch/riscv/lib/delay.c b/arch/riscv/lib/delay.c index dce8ae24c6d3..ee6853c1e341 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; + u64 ucycles = (u64)usecs * lpj_fine * UDELAY_MULT; if (unlikely(usecs > MAX_UDELAY_US)) { __delay((u64)usecs * riscv_timebase / 1000000ULL); -- cgit v1.2.3