On Tue, Aug 11, 2020 at 05:14:39PM -0700, Badhri Jagan Sridharan wrote: > From the spec: > "6.6.8.1 SwapSourceStartTimer > The SwapSourceStartTimer Shall be used by the new Source, after a Power > Role Swap or Fast Role Swap, to ensure that it does not send > Source_Capabilities Message before the new Sink is ready to receive the > Source_Capabilities Message. The new Source Shall Not send the > Source_Capabilities Message earlier than tSwapSourceStart after the > last bit of the EOP of GoodCRC Message sent in response to the PS_RDY > Message sent by the new Source indicating that its power supply is > ready." > > This fixes TD.PD.CP.E3, TD.PD.CP.E4, TD.PD.CP.E5 failures > > Signed-off-by: Badhri Jagan Sridharan <bad...@google.com>
Nit below, otherwise Reviewed-by: Guenter Roeck <li...@roeck-us.net> Note that I wasn't copied on this patch and only noticed it accidentally. Guenter > --- > Changes since V1: > - Comment on the permissible values of tSwapSourceStart > --- > 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 3ef37202ee37..d38347bd3335 100644 > --- a/drivers/usb/typec/tcpm/tcpm.c > +++ b/drivers/usb/typec/tcpm/tcpm.c > @@ -3555,7 +3555,7 @@ static void run_state_machine(struct tcpm_port *port) > */ > tcpm_set_pwr_role(port, TYPEC_SOURCE); > tcpm_pd_send_control(port, PD_CTRL_PS_RDY); > - tcpm_set_state(port, SRC_STARTUP, 0); > + tcpm_set_state(port, SRC_STARTUP, PD_T_SWAP_SRC_START); > break; > > case VCONN_SWAP_ACCEPT: > diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h > index b6c233e79bd4..ed5eed73ccf8 100644 > --- a/include/linux/usb/pd.h > +++ b/include/linux/usb/pd.h > @@ -473,6 +473,7 @@ static inline unsigned int rdo_max_power(u32 rdo) > #define PD_T_ERROR_RECOVERY 100 /* minimum 25 is insufficient */ > #define PD_T_SRCSWAPSTDBY 625 /* Maximum of 650ms */ > #define PD_T_NEWSRC 250 /* Maximum of 275ms */ > +#define PD_T_SWAP_SRC_START 20 /* Minimum of 20ms */ Odd alignment. Same as with the previous two lines which don't use tabs either. > > #define PD_T_DRP_TRY 100 /* 75 - 150 ms */ > #define PD_T_DRP_TRYWAIT 600 /* 400 - 800 ms */
