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[v2,2/4] spi: s3c64xx: add cpu_relax in polling loop

Message ID 20230419060639.38853-3-jaewon02.kim@samsung.com
State New
Headers show
Series Improves polling mode of s3c64xx driver | expand

Commit Message

Jaewon Kim April 19, 2023, 6:06 a.m. UTC 
Adds cpu_relax() to prevent long busy-wait.
There is busy-wait loop to check data transfer completion in polling mode.

Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com>
---
 drivers/spi/spi-s3c64xx.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 273aa02322d9..886722fb40ea 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -568,6 +568,7 @@  static int s3c64xx_wait_for_pio(struct s3c64xx_spi_driver_data *sdd,
 
 	val = msecs_to_loops(ms);
 	do {
+		cpu_relax();
 		status = readl(regs + S3C64XX_SPI_STATUS);
 	} while (RX_FIFO_LVL(status, sdd) < xfer->len && --val);