From: Paweł Anikiel <pan@semihalf.com>
Date: Fri, 17 Jun 2022 10:47:21 +0000 (+0200)
Subject: misc: atsha204a: Increase wake delay by tWHI
X-Git-Tag: v2022.07~10^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=73d88cf9719e505eedb389d117704f806e4747d1;p=platform%2Fkernel%2Fu-boot.git

misc: atsha204a: Increase wake delay by tWHI

From the ATSHA204A datasheet (document DS40002025A):

Wake: If SDA is held low for a period greater than tWLO, the device
exits low-power mode and, after a delay of tWHI, is ready to receive
I2C commands.

tWHI value can be found in table 7-2.

Signed-off-by: Paweł Anikiel <pan@semihalf.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---

diff --git a/drivers/misc/atsha204a-i2c.c b/drivers/misc/atsha204a-i2c.c
index aa6acf0..81ecb5b 100644
--- a/drivers/misc/atsha204a-i2c.c
+++ b/drivers/misc/atsha204a-i2c.c
@@ -21,7 +21,8 @@
 #include <linux/bitrev.h>
 #include <u-boot/crc.h>
 
-#define ATSHA204A_TWLO			60
+#define ATSHA204A_TWLO_US		60
+#define ATSHA204A_TWHI_US		2500
 #define ATSHA204A_TRANSACTION_TIMEOUT	100000
 #define ATSHA204A_TRANSACTION_RETRY	5
 #define ATSHA204A_EXECTIME		5000
@@ -109,7 +110,7 @@ int atsha204a_wakeup(struct udevice *dev)
 			continue;
 		}
 
-		udelay(ATSHA204A_TWLO);
+		udelay(ATSHA204A_TWLO_US + ATSHA204A_TWHI_US);
 
 		res = atsha204a_recv_resp(dev, &resp);
 		if (res) {