From cda2315000d257fb169e8e15675b667264634a74 Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Thu, 19 May 2016 19:15:27 +0100 Subject: [PATCH] staging: comedi: daqboard2000: prefer usleep_range() The checkpatch.pl warns about two `udelay(x)` calls, one of 100 microseconds, and one of 10 microseconds. The 100 microseconds one is used when waiting for FPGA to become ready to accept firmware, and is not that critical, so replace it with a call to `usleep_range(100, 1000)`. The 10 microseconds one is called as each 16-bit word of firmware data is written. Replace it with a fairly tight `usleep_range(10, 20)` to avoid slowing down firmware loading too much. The firmware is fairly short, so this would only slow it down firmware loading by about 20 milliseconds or so. Signed-off-by: Ian Abbott Reviewed-by: H Hartley Sweeten Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/daqboard2000.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/comedi/drivers/daqboard2000.c b/drivers/staging/comedi/drivers/daqboard2000.c index 6bc5bfefc41b..65daef0c00d5 100644 --- a/drivers/staging/comedi/drivers/daqboard2000.c +++ b/drivers/staging/comedi/drivers/daqboard2000.c @@ -476,7 +476,7 @@ static int daqboard2000_poll_cpld(struct comedi_device *dev, int mask) result = 1; break; } - udelay(100); + usleep_range(100, 1000); } udelay(5); return result; @@ -486,7 +486,7 @@ static int daqboard2000_write_cpld(struct comedi_device *dev, int data) { int result = 0; - udelay(10); + usleep_range(10, 20); writew(data, dev->mmio + 0x1000); if ((readw(dev->mmio + 0x1000) & DAQBOARD2000_CPLD_INIT) == DAQBOARD2000_CPLD_INIT) { -- 2.20.1