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spi/rockchip: Fix the wait_for_idle() timeout 

The wait_for_idle() could get unlucky and timeout too quickly.
Specifically, the old calculation was effectively:
  timeout = jiffies + 1;
  if (jiffies >= timeout) print warning;

From the above it should be obvious that if jiffies ticks in just the
wrong place then we'll have an effective timeout of 0.

Fix this by effectively changing the above ">=" to a ">".  That gives
us an extra jiffy to finish.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Doug Anderson 2014-09-03 13:44:25 -07:00 committed by Mark Brown
parent 7d1311b93e
commit 64bc0110f1
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-rockchip.c
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@ -220,7 +220,7 @@ static inline void wait_for_idle(struct rockchip_spi *rs)
do {
if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
return;
} while (time_before(jiffies, timeout));
} while (!time_after(jiffies, timeout));
dev_warn(rs->dev, "spi controller is in busy state!\n");
}