[PATCH 06/11] misc: atsha204a: Increase wake delay by tWHI
Paweł Anikiel
pan at semihalf.com
Fri Apr 1 14:43:20 CEST 2022
>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 at semihalf.com>
---
drivers/misc/atsha204a-i2c.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/misc/atsha204a-i2c.c b/drivers/misc/atsha204a-i2c.c
index b89463babb..ba2ae3d85a 100644
--- a/drivers/misc/atsha204a-i2c.c
+++ b/drivers/misc/atsha204a-i2c.c
@@ -20,7 +20,8 @@
#include <linux/delay.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
@@ -225,7 +226,7 @@ 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) {
--
2.35.1.1094.g7c7d902a7c-goog
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