[PATCH] misc: atsha204a: Don't check for error when waking up the device

[Pali Rohár]

The device ignores any levels or transitions on the SCL pin when the device
is idle, asleep or during waking up.

Linux kernel driver for atsha204a (atmel-sha204a.ko) also ignores return
value from i2c wakeup send command, see:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/crypto/atmel-i2c.c?h=v5.19#n174

And also userspace Turris libatsha204 library ignores return value from
wakeup send command, see:
https://gitlab.nic.cz/turris/libatsha204/-/blob/v29.2/src/libatsha204/layer_ni2c.c#L75-76

U-Boot driver should do same thing.

Fixes waking up ATSHA204 on Turris 1.x boards.

Signed-off-by: Pali Rohár <pali at kernel.org>
---
 drivers/misc/atsha204a-i2c.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/misc/atsha204a-i2c.c b/drivers/misc/atsha204a-i2c.c
index 81ecb5b6177b..fa2d5948f128 100644
--- a/drivers/misc/atsha204a-i2c.c
+++ b/drivers/misc/atsha204a-i2c.c
@@ -103,12 +103,13 @@ int atsha204a_wakeup(struct udevice *dev)
 	for (try = 1; try <= 10; ++try) {
 		debug("Try %i... ", try);
 
+		/*
+		 * The device ignores any levels or transitions on the SCL pin
+		 * when the device is idle, asleep or during waking up.
+		 * Don't check for error when waking up the device.
+		 */
 		memset(req, 0, 4);
-		res = atsha204a_send(dev, req, 4);
-		if (res) {
-			debug("failed on I2C send, trying again\n");
-			continue;
-		}
+		atsha204a_send(dev, req, 4);
 
 		udelay(ATSHA204A_TWLO_US + ATSHA204A_TWHI_US);
 
-- 
2.20.1