[Skiboot] [PATCH 3/4] libstb/i2c-driver: Bump max timeout

[Oliver O'Halloran]

We have observed some TPMs clock streching the I2C bus for signifigant
amounts of time when processing commands. The same TPMs also have
errata that can result in permernantly locking up a bus in response to
an I2C transaction they don't understand. Using an excessively long
timeout to prevent this in the field.

Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
---
 libstb/drivers/tpm_i2c_interface.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libstb/drivers/tpm_i2c_interface.c b/libstb/drivers/tpm_i2c_interface.c
index a6342e0c7e43..8e5ba3263cdc 100644
--- a/libstb/drivers/tpm_i2c_interface.c
+++ b/libstb/drivers/tpm_i2c_interface.c
@@ -21,7 +21,8 @@
 #include "tpm_i2c_interface.h"
 #include "../status_codes.h"
 
-#define I2C_BYTE_TIMEOUT_MS		30  /* 30ms/byte timeout */
+/* TPMs can clock strech I2C operations for a LOOOOOOONG */
+#define I2C_BYTE_TIMEOUT_MS		2000  /* 2000ms/byte timeout */
 
 /**
  * tpm_i2c_request_send - send request to i2c bus
-- 
2.9.5