[U-Boot] [PATCH 1/2] drivers/spi: fsl_qspi: fix controller busy check

[Thomas Schaefer]

During QSPI reads, current is_controller_busy function sporadically
fails with -ETIMEDOUT due to fixed number of 5 test loops. Using
timer functions to wait 1000 us instead will fix this.

Signed-off-by: Thomas Schaefer <thomas.schaefer at kontron.com>
---
 drivers/spi/fsl_qspi.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
index 1598c4f698..2c5937509f 100644
--- a/drivers/spi/fsl_qspi.c
+++ b/drivers/spi/fsl_qspi.c
@@ -152,7 +152,7 @@ static inline int is_controller_busy(const struct fsl_qspi_priv *priv)
 	u32 val;
 	const u32 mask = QSPI_SR_BUSY_MASK | QSPI_SR_AHB_ACC_MASK |
 			 QSPI_SR_IP_ACC_MASK;
-	unsigned int retry = 5;
+	unsigned long timeout = timer_get_us() + 1000;
 
 	do {
 		val = qspi_read32(priv->flags, &priv->regs->sr);
@@ -160,10 +160,9 @@ static inline int is_controller_busy(const struct fsl_qspi_priv *priv)
 		if ((~val & mask) == mask)
 			return 0;
 
-		udelay(1);
-	} while (--retry);
-
-	return -ETIMEDOUT;
+		if (timer_get_us() > timeout )
+			return -ETIMEDOUT;
+	} while (1);
 }
 
 /* QSPI support swapping the flash read/write data
-- 
2.11.0