diff options
| author | Paweł Anikiel <pan@semihalf.com> | 2022-06-17 12:47:21 +0200 |
|---|---|---|
| committer | Tien Fong Chee <tien.fong.chee@intel.com> | 2022-07-01 14:57:14 +0800 |
| commit | 73d88cf9719e505eedb389d117704f806e4747d1 (patch) | |
| tree | 5dc732d608597176be66933991d30d936b90cb01 | |
| parent | 61298270c56d14f55e26ac17c8b5e110aa13e12c (diff) | |
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>
| -rw-r--r-- | drivers/misc/atsha204a-i2c.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/misc/atsha204a-i2c.c b/drivers/misc/atsha204a-i2c.c index aa6acf0f9a0..81ecb5b6177 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) { |