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From: Guenter Roeck <linux@roeck-us.net>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: heikki.krogerus@linux.intel.com, linux-usb@vger.kernel.org,
	linux-kernel@vger.kernel.org, Kyle Tso <kyletso@google.com>,
	Badhri Jagan Sridharan <badhri@google.com>,
	Will McVicker <willmcvicker@google.com>
Subject: Re: [PATCH 4/5] USB: typec: tcpm: Add a 30ms room for tPSSourceOn in PR_SWAP
Date: Thu, 10 Dec 2020 09:44:09 -0800	[thread overview]
Message-ID: <20201210174409.GE107395@roeck-us.net> (raw)
In-Reply-To: <20201210160521.3417426-5-gregkh@linuxfoundation.org>

On Thu, Dec 10, 2020 at 05:05:20PM +0100, Greg Kroah-Hartman wrote:
> From: Kyle Tso <kyletso@google.com>
> 
> 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>
> 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>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  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 d51c45961893..5ed78194a1bd 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -3728,7 +3728,7 @@ 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:
>  		/* Set the vbus disconnect threshold for implicit contract */
> diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
> index 63a66dd5d832..bb9a782e1411 100644
> --- a/include/linux/usb/pd.h
> +++ b/include/linux/usb/pd.h
> @@ -466,6 +466,7 @@ 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
> -- 
> 2.29.2
> 

  reply	other threads:[~2020-12-10 17:45 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-10 16:05 [PATCH 0/5] USB: typec: various patches Greg Kroah-Hartman
2020-12-10 16:05 ` [PATCH 1/5] USB: typec: tcpm: Prevent log overflow by removing old entries Greg Kroah-Hartman
2020-12-10 17:42   ` Guenter Roeck
2020-12-10 19:10     ` Badhri Jagan Sridharan
2020-12-11  0:01       ` Guenter Roeck
2020-12-10 16:05 ` [PATCH 2/5] USB: typec: tcpm: Hard Reset after not receiving a Request Greg Kroah-Hartman
2020-12-10 17:43   ` Guenter Roeck
2020-12-10 16:05 ` [PATCH 3/5] USB: typec: tcpm: Fix PR_SWAP error handling Greg Kroah-Hartman
2020-12-10 17:43   ` Guenter Roeck
2020-12-10 16:05 ` [PATCH 4/5] USB: typec: tcpm: Add a 30ms room for tPSSourceOn in PR_SWAP Greg Kroah-Hartman
2020-12-10 17:44   ` Guenter Roeck [this message]
2020-12-10 16:05 ` [PATCH 5/5] USB: typec: tcpci: Add Bleed discharge to POWER_CONTROL definition Greg Kroah-Hartman
2020-12-10 17:45   ` Guenter Roeck
2020-12-10 18:56     ` Badhri Jagan Sridharan
2020-12-11  4:47       ` Badhri Jagan Sridharan
2020-12-11  6:38         ` Greg Kroah-Hartman
2020-12-11  8:30 ` [PATCH 0/5] USB: typec: various patches Heikki Krogerus
2020-12-11  9:51   ` Greg Kroah-Hartman

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