linux-kernel - Re: [PATCH v2 08/11] staging: typec: tcpm: Set mux to device mode when configured as such

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Date:   Sun, 10 Sep 2017 15:56:16 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Hans de Goede <hdegoede@...hat.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Peter Rosin <peda@...ntia.se>,
        Mathias Nyman <mathias.nyman@...el.com>
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 08/11] staging: typec: tcpm: Set mux to device mode
 when configured as such

On 09/05/2017 09:42 AM, Hans de Goede wrote:
> Setting the mux to TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT when the
> data-role is device is not correct. Plenty of devices support operating
> as USB device through a (separate) USB device controller.
> 
> So this commit instead splits out TYPEC_MUX_USB into TYPEC_MUX_USB_HOST
> and TYPEC_MUX_USB_DEVICE and makes tcpm_set_roles() set the mux
> accordingly.
> 
> Likewise TCPC_MUX_DP gets renamed to TCPC_MUX_DP_SRC to make clear that
> this is for configuring the Type-C port as a Display Port source, not a
> sink.
> 
> Last this commit makes tcpm_reset_port() to set the mux to
> TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT so that it does not and up
> staying in host (and with this commit also device) mode after a detach.
> 
This sentence is hard to understand.

> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

Otherwise

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

> ---
>   drivers/staging/typec/tcpm.c |  7 ++++---
>   drivers/staging/typec/tcpm.h | 22 ++++++++++++++--------
>   2 files changed, 18 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
> index 8af62e74d54c..ffe7e26d4ed3 100644
> --- a/drivers/staging/typec/tcpm.c
> +++ b/drivers/staging/typec/tcpm.c
> @@ -752,11 +752,11 @@ static int tcpm_set_roles(struct tcpm_port *port, bool attached,
>   	int ret;
>   
>   	if (data == TYPEC_HOST)
> -		ret = tcpm_mux_set(port, TYPEC_MUX_USB,
> +		ret = tcpm_mux_set(port, TYPEC_MUX_USB_HOST,
>   				   TCPC_USB_SWITCH_CONNECT);
>   	else
> -		ret = tcpm_mux_set(port, TYPEC_MUX_NONE,
> -				   TCPC_USB_SWITCH_DISCONNECT);
> +		ret = tcpm_mux_set(port, TYPEC_MUX_USB_DEVICE,
> +				   TCPC_USB_SWITCH_CONNECT);
>   	if (ret < 0)
>   		return ret;
>   
> @@ -2025,6 +2025,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
>   	tcpm_init_vconn(port);
>   	tcpm_set_current_limit(port, 0, 0);
>   	tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
> +	tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT);
>   	tcpm_set_attached_state(port, false);
>   	port->try_src_count = 0;
>   	port->try_snk_count = 0;
> diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
> index 7e9a6b7b5cd6..f662eed48c86 100644
> --- a/drivers/staging/typec/tcpm.h
> +++ b/drivers/staging/typec/tcpm.h
> @@ -83,17 +83,23 @@ enum tcpc_usb_switch {
>   };
>   
>   /* Mux state attributes */
> -#define TCPC_MUX_USB_ENABLED		BIT(0)	/* USB enabled */
> -#define TCPC_MUX_DP_ENABLED		BIT(1)	/* DP enabled */
> -#define TCPC_MUX_POLARITY_INVERTED	BIT(2)	/* Polarity inverted */
> +#define TCPC_MUX_USB_DEVICE_ENABLED		BIT(0)	/* USB device enabled */
> +#define TCPC_MUX_USB_HOST_ENABLED		BIT(1)	/* USB host enabled */
> +#define TCPC_MUX_DP_SRC_ENABLED			BIT(2)	/* DP enabled */
> +#define TCPC_MUX_POLARITY_INVERTED		BIT(3)	/* Polarity inverted */
>   
>   /* Mux modes, decoded to attributes */
>   enum tcpc_mux_mode {
> -	TYPEC_MUX_NONE	= 0,				/* Open switch */
> -	TYPEC_MUX_USB	= TCPC_MUX_USB_ENABLED,		/* USB only */
> -	TYPEC_MUX_DP	= TCPC_MUX_DP_ENABLED,		/* DP only */
> -	TYPEC_MUX_DOCK	= TCPC_MUX_USB_ENABLED |	/* Both USB and DP */
> -			  TCPC_MUX_DP_ENABLED,
> +	/* Open switch */
> +	TYPEC_MUX_NONE = 0,
> +	/* USB device only */
> +	TYPEC_MUX_USB_DEVICE = TCPC_MUX_USB_DEVICE_ENABLED,
> +	/* USB host only */
> +	TYPEC_MUX_USB_HOST = TCPC_MUX_USB_HOST_ENABLED,
> +	/* DP source only */
> +	TYPEC_MUX_DP = TCPC_MUX_DP_SRC_ENABLED,
> +	/* Both USB host and DP source */
> +	TYPEC_MUX_DOCK = TCPC_MUX_USB_HOST_ENABLED | TCPC_MUX_DP_SRC_ENABLED,
>   };
>   
>   struct tcpc_mux_dev {
>