[PATCH AUTOSEL 5.4 115/130] USB: typec: tcpm: Add a 30ms room for tPSSourceOn in PR_SWAP

Sasha Levin
2020-12-23T02:56:35Z

From: Kyle Tso <kyletso@google.com>

[ Upstream commit fe79d5de77204dd946cfad76a9bec23354b1a500 ]

TCPM state machine needs 20-25ms to enter the ErrorRecovery state after
tPSSourceOn timer timeouts. Change the timer from max 480ms to 450ms to
ensure that the timer complies with the Spec. In order to keep the
flexibility for other usecases using tPSSourceOn, add another timer only
for PR_SWAP.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Kyle Tso <kyletso@google.com>
Signed-off-by: Will McVicker <willmcvicker@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20201210160521.3417426-5-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/typec/tcpm/tcpm.c | 2 +-
include/linux/usb/pd.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 0c0f251ab8a51..77a49e16e285e 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -3451,7 +3451,7 @@ static void run_state_machine(struct tcpm_port *port)
tcpm_set_state(port, ERROR_RECOVERY, 0);
break;
}
- tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON);
+ tcpm_set_state(port, ERROR_RECOVERY, PD_T_PS_SOURCE_ON_PRS);
break;
case PR_SWAP_SRC_SNK_SINK_ON:
tcpm_set_state(port, SNK_STARTUP, 0);
diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
index 6655ce32feff1..203fca353fdce 100644
--- a/include/linux/usb/pd.h
+++ b/include/linux/usb/pd.h
@@ -432,6 +432,7 @@ static inline unsigned int rdo_max_power(u32 rdo)
#define PD_T_DRP_SRC 30
#define PD_T_PS_SOURCE_OFF 920
#define PD_T_PS_SOURCE_ON 480
+#define PD_T_PS_SOURCE_ON_PRS 450 /* 390 - 480ms */
#define PD_T_PS_HARD_RESET 30
#define PD_T_SRC_RECOVER 760
#define PD_T_SRC_RECOVER_MAX 1000
--
2.27.0