linux-kernel - Re: [PATCH v3 11/13] platform/x86: intel_cht_int33fe: Provide fwnode for the USB connector

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Message-ID: <daed3557-7595-86c5-fde1-6ec048b0935d@redhat.com>
Date:   Wed, 17 Apr 2019 11:52:00 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v3 11/13] platform/x86: intel_cht_int33fe: Provide fwnode
 for the USB connector

Hi,

On 12-04-19 15:41, Heikki Krogerus wrote:
> In ACPI, and now also in DT, the USB connectors usually have
> their own device nodes. In case of USB Type-C, those
> connector (port) nodes are child nodes of the controller or
> PHY device, in our case the fusb302. The software fwnodes
> allow us to create a similar child node for fusb302 that
> represents the connector also on Intel CHT.
> 
> This makes it possible replace the fusb302 specific device
> properties which were deprecated with the common USB
> connector properties that tcpm.c is able to use directly.
> 
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>   drivers/platform/x86/intel_cht_int33fe.c | 37 ++++++++++++++++++++++--
>   1 file changed, 34 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel_cht_int33fe.c b/drivers/platform/x86/intel_cht_int33fe.c
> index 863a792d9282..eff5990322ff 100644
> --- a/drivers/platform/x86/intel_cht_int33fe.c
> +++ b/drivers/platform/x86/intel_cht_int33fe.c
> @@ -24,6 +24,7 @@
>   #include <linux/platform_device.h>
>   #include <linux/regulator/consumer.h>
>   #include <linux/slab.h>
> +#include <linux/usb/pd.h>
>   
>   #define EXPECTED_PTYPE		4
>   
> @@ -31,6 +32,7 @@ enum {
>   	INT33FE_NODE_FUSB302,
>   	INT33FE_NODE_MAX17047,
>   	INT33FE_NODE_PI3USB30532,
> +	INT33FE_NODE_USB_CONNECTOR,
>   	INT33FE_NODE_MAX,
>   };
>   
> @@ -111,9 +113,29 @@ cht_int33fe_register_max17047(struct device *dev, struct cht_int33fe_data *data)
>   
>   static const struct property_entry fusb302_props[] = {
>   	PROPERTY_ENTRY_STRING("linux,extcon-name", "cht_wcove_pwrsrc"),
> -	PROPERTY_ENTRY_U32("fcs,max-sink-microvolt", 12000000),
> -	PROPERTY_ENTRY_U32("fcs,max-sink-microamp",   3000000),
> -	PROPERTY_ENTRY_U32("fcs,max-sink-microwatt", 36000000),

Note that the 36000000 value being removed here is max-sink-microwatt,
esp. the _max_ part is important. And recent versions of the fusb302
code ignore this entirely.

> +	{ }
> +};
> +
> +#define PDO_FIXED_FLAGS \
> +	(PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP | PDO_FIXED_USB_COMM)
> +
> +static const u32 src_pdo[] = {
> +	PDO_FIXED(5000, 1500, PDO_FIXED_FLAGS),
> +};
> +
> +static const u32 snk_pdo[] = {
> +	PDO_FIXED(5000, 400, PDO_FIXED_FLAGS),
> +	PDO_VAR(5000, 12000, 3000),
> +};
> +
> +static const struct property_entry usb_connector_props[] = {
> +	PROPERTY_ENTRY_STRING("name", "connector"),
> +	PROPERTY_ENTRY_STRING("data-role", "dual"),
> +	PROPERTY_ENTRY_STRING("power-role", "dual"),
> +	PROPERTY_ENTRY_STRING("try-power-role", "sink"),
> +	PROPERTY_ENTRY_U32_ARRAY("source-pdos", src_pdo),
> +	PROPERTY_ENTRY_U32_ARRAY("sink-pdos", snk_pdo),
> +	PROPERTY_ENTRY_U32("op-sink-microwatt", 36000000),

Where as "op-sink-microwatt" is more interpreted as a minimum
value for non PPS supplies not being able to deliver this causes
the Capability Mismatch to get set. But for PPS supplies if I'm
reading the code correctly, the entire PPS negotiation is failed
by tcpm.c if this cannot be matched. I guess / hope that there
is a fallback to none PPS PDOs then but I'm not sure.

Anyways the charger the GPD-win ships with is a non PD capable
5V/2A charger and the GPD-pocket ships with a charger which does
max 12V/2A. The device itself will work fine on around 10W and
even charge at that level (albeit slowly). So I believe that 10W
would be a better value for "op-sink-microwatt" (the dt-binding
says it is mandatory so we cannot just leave it out).

Regards,

Hans





>   	{ }
>   };
>   
> @@ -148,6 +170,15 @@ static int cht_int33fe_add_nodes(struct cht_int33fe_data *data)
>   		data->node[i] = fwnode;
>   	}
>   
> +	/* Node for the USB connector (FUSB302 is the parent) */
> +	fwnode = fwnode_create_software_node(usb_connector_props,
> +					     data->node[INT33FE_NODE_FUSB302]);
> +	if (IS_ERR(fwnode)) {
> +		ret = PTR_ERR(fwnode);
> +		goto err_remove_nodes;
> +	}
> +	data->node[INT33FE_NODE_USB_CONNECTOR] = fwnode;
> +
>   	return 0;
>   
>   err_remove_nodes:
>