[PATCH 2/2] spi: hisi-kunpeng: Add timeout warning in FIFO flush function

[Pei Xiao <xiaopei01@kylinos.cn>]

When flushing the FIFO, the driver waits for the busy flag to clear
with a timeout. Change the loop condition to use pre-decrement (--limit)
instead of post-decrement (limit--) so that warning message can show. Add a
ratelimited warning message to log SPI busy timeout events, aiding in
debugging.

Signed-off-by: Pei Xiao <xiaopei01@kylinos.cn>
---
 drivers/spi/spi-hisi-kunpeng.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-hisi-kunpeng.c b/drivers/spi/spi-hisi-kunpeng.c
index c42d2a2cdf1e..046bd894040b 100644
--- a/drivers/spi/spi-hisi-kunpeng.c
+++ b/drivers/spi/spi-hisi-kunpeng.c
@@ -208,7 +208,10 @@ static void hisi_spi_flush_fifo(struct hisi_spi *hs)
 			break;
 		}
 
-	} while (hisi_spi_busy(hs) && limit--);
+	} while (hisi_spi_busy(hs) && --limit);
+
+	if (!limit)
+		dev_warn_ratelimited(hs->dev, "SPI busy timeout\n");
 }
 
 /* Disable the controller and all interrupts */
-- 
2.25.1