[PATCH linux dev-4.7] drivers/fsi: Add more time between clocking and data sampling

[Christopher Bostic]

Under high work loads the ARM core can occasionaly hit invalid
timings between the FSI clock and data lines which leads to
data crc errors.  Add further delay between clock switch and
data line changes.

Signed-off-by: Christopher Bostic <cbostic at linux.vnet.ibm.com>
---
 drivers/fsi/fsi-master-gpio.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
index a8976d5..a93453f 100644
--- a/drivers/fsi/fsi-master-gpio.c
+++ b/drivers/fsi/fsi-master-gpio.c
@@ -13,7 +13,7 @@
 
 #include "fsi-master.h"
 
-#define	FSI_GPIO_STD_DLY	1	/* Standard pin delay in nS */
+#define	FSI_GPIO_STD_DLY	1	/* Standard pin delay in uS */
 #define	FSI_ECHO_DELAY_CLOCKS	16	/* Number clocks for echo delay */
 #define	FSI_PRE_BREAK_CLOCKS	50	/* Number clocks to prep for break */
 #define	FSI_BREAK_CLOCKS	256	/* Number of clocks to issue break */
@@ -86,9 +86,9 @@ static void clock_toggle(struct fsi_master_gpio *master, int count)
 	int i;
 
 	for (i = 0; i < count; i++) {
-		ndelay(FSI_GPIO_STD_DLY);
+		udelay(FSI_GPIO_STD_DLY);
 		gpiod_set_value(master->gpio_clk, 0);
-		ndelay(FSI_GPIO_STD_DLY);
+		udelay(FSI_GPIO_STD_DLY);
 		gpiod_set_value(master->gpio_clk, 1);
 	}
 }
@@ -97,7 +97,7 @@ static int sda_in(struct fsi_master_gpio *master)
 {
 	int in;
 
-	ndelay(FSI_GPIO_STD_DLY);
+	udelay(FSI_GPIO_STD_DLY);
 	in = gpiod_get_value(master->gpio_data);
 	return in ? 1 : 0;
 }
-- 
1.8.2.2