linux-kernel - Re: [PATCH 6/6] platform/chrome: cros_ec

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Date:   Fri, 6 Nov 2020 00:59:07 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, heikki.krogerus@...ux.intel.com,
        dzigterman@...omium.org, alevkoy@...omium.org,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH 6/6] platform/chrome: cros_ec_typec: Store cable plug type

Hi Greg,

Thanks for looking at the patch.

On Fri, Nov 06, 2020 at 08:20:59AM +0100, Greg Kroah-Hartman wrote:
> On Thu, Nov 05, 2020 at 05:28:03PM -0800, Prashant Malani wrote:
> > Use the PD VDO Type C cable plug type macro to retrieve and store the
> > cable plug type in the cable descriptor.
> > 
> > Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Signed-off-by: Prashant Malani <pmalani@...omium.org>
> > ---
> >  drivers/platform/chrome/cros_ec_typec.c | 21 ++++++++++++++++++++-
> >  1 file changed, 20 insertions(+), 1 deletion(-)
> 
> Where are the first 5 patches in this series?

I believe I'd cc-ed you (and linux-usb) on the following patches in the
series(modified git_cc[1] which adds individual patch get_maintainers.pl to the cover
letter, patch 1 and patch 2):
cover letter:
https://lore.kernel.org/lkml/20201106012758.525472-1-pmalani@chromium.org/
patch 1/6 (cros-ec-typec cleanup):
https://lore.kernel.org/lkml/20201106012758.525472-2-pmalani@chromium.org/
patch 2/6 (cros-ec-typec cleanup):
https://lore.kernel.org/lkml/20201106012758.525472-2-pmalani@chromium.org/
patch 5/6 (PD VDO header patch):
https://lore.kernel.org/lkml/20201106012758.525472-6-pmalani@chromium.org/
patch 6/6 (this patch):
https://lore.kernel.org/lkml/20201106012758.525472-7-pmalani@chromium.org/

Did you not receive these?
> 
> 
> > 
> > diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> > index 5e7f0b4ebbec..0a2a8b0f8115 100644
> > --- a/drivers/platform/chrome/cros_ec_typec.c
> > +++ b/drivers/platform/chrome/cros_ec_typec.c
> > @@ -709,6 +709,7 @@ static int cros_typec_handle_sop_prime_disc(struct cros_typec_data *typec, int p
> >  		.port = port_num,
> >  		.partner_type = TYPEC_PARTNER_SOP_PRIME,
> >  	};
> > +	uint32_t cable_plug_type;
> 
> u32 please, this isn't userspace code :)

Will fix this in the next version.
> 
> >  	int ret = 0;
> >  
> >  	memset(disc, 0, EC_PROTO2_MAX_RESPONSE_SIZE);
> > @@ -722,8 +723,26 @@ static int cros_typec_handle_sop_prime_disc(struct cros_typec_data *typec, int p
> >  	/* Parse the PD identity data, even if only 0s were returned. */
> >  	cros_typec_parse_pd_identity(&port->c_identity, disc);
> >  
> > -	if (disc->identity_count != 0)
> > +	if (disc->identity_count != 0) {
> > +		cable_plug_type = VDO_TYPEC_CABLE_TYPE(port->c_identity.vdo[0]);
> > +		switch (cable_plug_type) {
> > +		case CABLE_ATYPE:
> > +			desc.type = USB_PLUG_TYPE_A;
> > +			break;
> > +		case CABLE_BTYPE:
> > +			desc.type = USB_PLUG_TYPE_B;
> > +			break;
> > +		case CABLE_CTYPE:
> > +			desc.type = USB_PLUG_TYPE_C;
> > +			break;
> > +		case CABLE_CAPTIVE:
> > +			desc.type = USB_PLUG_CAPTIVE;
> > +			break;
> > +		default:
> > +			desc.type = USB_PLUG_NONE;
> > +		}
> >  		desc.active = PD_IDH_PTYPE(port->c_identity.id_header) == IDH_PTYPE_ACABLE;
> > +	}
> 
> So you save it but what happens with the value?

The type C connector class framework exposes it via syfs to user-space when we
register the cable via typec_register_cable() in patch 4/6 [2].

I'll go ahead and CC
you and linux-usb on the entire series for the next version.

[1]: https://lwn.net/Articles/585782/
[2]:
https://lore.kernel.org/lkml/20201106012758.525472-5-pmalani@chromium.org/

Best regards,