linux-kernel - Re: [PATCH v3 3/3] usb: typec: ucsi: Get PD revision for partner

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CANFp7mXOXc6TzLJ+EJ9VYxqGHcjW099oBhDctarUdM5eJGz5bg@mail.gmail.com>
Date: Mon, 5 Feb 2024 14:05:38 -0800
From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To: Prashant Malani <pmalani@...omium.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, linux-usb@...r.kernel.org, 
	jthies@...gle.com, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Bjorn Andersson <andersson@...nel.org>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	Fabrice Gasnier <fabrice.gasnier@...s.st.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Hans de Goede <hdegoede@...hat.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Rajaram Regupathy <rajaram.regupathy@...el.com>, 
	Saranya Gopal <saranya.gopal@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] usb: typec: ucsi: Get PD revision for partner

Hi Heikki,

Friendly ping to review this patch (I see you added Reviewed-by to the
other two in this series).

Thanks,
Abhishek

On Fri, Jan 26, 2024 at 12:25 PM Prashant Malani <pmalani@...omium.org> wrote:
>
> Hi Abhishek,
>
> On Fri, Jan 26, 2024 at 10:39 AM Abhishek Pandit-Subedi
> <abhishekpandit@...omium.org> wrote:
> >
> > PD major revision for the port partner is described in
> > GET_CONNECTOR_CAPABILITY and is only valid on UCSI 2.0 and newer. Update
> > the pd_revision on the partner if the UCSI version is 2.0 or newer.
> >
> > Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> > ---
> > $ cat /sys/class/typec/port2-partner/usb_power_delivery_revision
> > 3.0
> >
> > (no changes since v2)
> >
> > Changes in v2:
> >   - Formatting changes and update macro to use brackets.
> >   - Fix incorrect guard condition when checking connector capability.
> >
> >  drivers/usb/typec/ucsi/ucsi.c | 23 +++++++++++++++++++++++
> >  drivers/usb/typec/ucsi/ucsi.h |  3 +++
> >  2 files changed, 26 insertions(+)
> >
> > diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> > index a35056ee3e96..2b7983d2fdae 100644
> > --- a/drivers/usb/typec/ucsi/ucsi.c
> > +++ b/drivers/usb/typec/ucsi/ucsi.c
> > @@ -782,6 +782,7 @@ static int ucsi_register_partner(struct ucsi_connector *con)
> >         }
> >
> >         desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD;
> > +       desc.pd_revision = UCSI_CONCAP_FLAG_PARTNER_PD_MAJOR_REV_AS_BCD(con->cap.flags);
> >
> >         partner = typec_register_partner(con->port, &desc);
> >         if (IS_ERR(partner)) {
> > @@ -856,6 +857,27 @@ static void ucsi_partner_change(struct ucsi_connector *con)
> >                         con->num, u_role);
> >  }
> >
> > +static int ucsi_check_connector_capability(struct ucsi_connector *con)
> > +{
> > +       u64 command;
> > +       int ret;
> > +
> > +       if (!con->partner || !IS_MIN_VERSION_2_0(con->ucsi))
>
> I'll reiterate my comment from a previous version, since this series
> has been revv-ed a few
> times since and it may have gotten lost; no need to respond to it if
> you don't want to,
> since I believe we left it to the maintainer(s) to decide [1]:
>
> This macro is unnecessary. Since the version is in BCD format and we
> already have the
> macros for versions, just a simple comparison is enough:
>          if (!con-partner || con->ucsi->version < UCSI_VERSION_2_0)
>                  return 0;
>
> I'll add that Patch 1 of this series [2] is also using the same style
> for comparing version numbers.
>
> > +               return 0;
> > +
> > +       command = UCSI_GET_CONNECTOR_CAPABILITY | UCSI_CONNECTOR_NUMBER(con->num);
> > +       ret = ucsi_send_command(con->ucsi, command, &con->cap, sizeof(con->cap));
> > +       if (ret < 0) {
> > +               dev_err(con->ucsi->dev, "GET_CONNECTOR_CAPABILITY failed (%d)\n", ret);
>
> nit: I know this is being done elsewhere in this file, but we should
> avoid putting error
> numbers in parentheses [3]. Perhaps something for a separate cleanup patch.
>
> [1] https://lore.kernel.org/linux-usb/CANFp7mXP=aN8bQi4akKKcoMZE8RaCBuFnwTa5hbp0MZvZe0hYQ@mail.gmail.com/
> [2] https://lore.kernel.org/linux-usb/20240126103859.v3.1.Iacf5570a66b82b73ef03daa6557e2fc0db10266a@changeid/
> [3] https://www.kernel.org/doc/html/latest/process/coding-style.html#printing-kernel-messages