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>

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index c0743604b906c749b62d1fedaaa8f3250b70c0c9..2a31bc2d3fd335b1760dc425bfa9409eeec2101d 100644 (file)
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -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");
 }