On Sun, Mar 17, 2019 at 2:56 PM Oskari Lemmela oskari@lemmela.net wrote:
Fixes spurious timeouts which have been seen during testing SPI_SUNXI driver. The false timeouts disappear when number of bits reduced to 10 in workaround.
The false timeouts are caused by timer backward jumps.
Wouldn't it be best to apply the same fix as the kernel uses here [1] as a more permanent fix?
[1] https://www.spinics.net/lists/arm-kernel/msg699622.html
Signed-off-by: Oskari Lemmela oskari@lemmela.net
arch/arm/cpu/armv8/generic_timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/cpu/armv8/generic_timer.c b/arch/arm/cpu/armv8/generic_timer.c index c1706dcec1..2e06ee4ed2 100644 --- a/arch/arm/cpu/armv8/generic_timer.c +++ b/arch/arm/cpu/armv8/generic_timer.c @@ -66,7 +66,7 @@ unsigned long timer_read_counter(void) isb(); do { asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
} while (((cntpct + 1) & GENMASK(10, 0)) <= 1);
} while (((cntpct + 1) & GENMASK(9, 0)) <= 1); return cntpct;}
2.17.1
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