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Subject: Re: [PATCH v2] platform/chrome: cros_ec_typec: USB4 support
To:     Prashant Malani <pmalani@chromium.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc:     Rajmohan Mani <rajmohan.mani@intel.com>,
        Heikki Krogerus <heikki.krogerus@linux.intel.com>,
        Benson Leung <bleung@chromium.org>,
        Guenter Roeck <groeck@chromium.org>
References: <20200710194017.1126000-1-pmalani@chromium.org>
 <CACeCKadwsH2yhqegZubgJnLy+p0CM3H1DzXiA-72Gagy2aYB-A@mail.gmail.com>
From:   Enric Balletbo i Serra <enric.balletbo@collabora.com>
Message-ID: <d09324a9-0a3e-3dd5-5521-dcd2d04a9d3f@collabora.com>
Date:   Wed, 22 Jul 2020 17:27:32 +0200
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Hi Prashant,

On 21/7/20 21:55, Prashant Malani wrote:
> Hey Enric, Benson,
> 
> Just wondering if you've had a chance to review this patch.
> 

It's on my radar but I'm waiting for the dependencies to be merged.


> Best regards,
> 
> -Prashant
> 
> On Fri, Jul 10, 2020 at 12:40 PM Prashant Malani <pmalani@chromium.org> wrote:
>>
>> From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>>
>> With USB4 mode the mux driver needs the Enter_USB Data
>> Object (EUDO) that was used when the USB mode was entered.
>> Though the object is not available in the driver, it is
>> possible to construct it from the information we have.
>>
>> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>> Signed-off-by: Prashant Malani <pmalani@chromium.org>

For my own reference:

Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

>> ---
>>
>> This patch depends on latest usb-next from Greg KH, this commit in
>> particular:
>> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=ad8db94d6813dc659bd4de0531a8a1150559eafb
>>
>> Changes in v2:
>> - Removed EUDO bits for cable current and tunneling support.
>>
>>  drivers/platform/chrome/cros_ec_typec.c | 33 ++++++++++++++++++++++++-
>>  1 file changed, 32 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
>> index 0c041b79cbba..a9700275a851 100644
>> --- a/drivers/platform/chrome/cros_ec_typec.c
>> +++ b/drivers/platform/chrome/cros_ec_typec.c
>> @@ -13,6 +13,7 @@
>>  #include <linux/platform_data/cros_ec_proto.h>
>>  #include <linux/platform_data/cros_usbpd_notify.h>
>>  #include <linux/platform_device.h>
>> +#include <linux/usb/pd.h>
>>  #include <linux/usb/typec.h>
>>  #include <linux/usb/typec_altmode.h>
>>  #include <linux/usb/typec_dp.h>
>> @@ -494,6 +495,34 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
>>         return typec_mux_set(port->mux, &port->state);
>>  }
>>
>> +static int cros_typec_enable_usb4(struct cros_typec_data *typec,
>> +                                 int port_num,
>> +                                 struct ec_response_usb_pd_control_v2 *pd_ctrl)
>> +{
>> +       struct cros_typec_port *port = typec->ports[port_num];
>> +       struct enter_usb_data data;
>> +
>> +       data.eudo = EUDO_USB_MODE_USB4 << EUDO_USB_MODE_SHIFT;
>> +
>> +       /* Cable Speed */
>> +       data.eudo |= pd_ctrl->cable_speed << EUDO_CABLE_SPEED_SHIFT;
>> +
>> +       /* Cable Type */
>> +       if (pd_ctrl->control_flags & USB_PD_CTRL_OPTICAL_CABLE)
>> +               data.eudo |= EUDO_CABLE_TYPE_OPTICAL << EUDO_CABLE_TYPE_SHIFT;
>> +       else if (pd_ctrl->control_flags & USB_PD_CTRL_ACTIVE_CABLE)
>> +               data.eudo |= EUDO_CABLE_TYPE_RE_TIMER << EUDO_CABLE_TYPE_SHIFT;
>> +
>> +       data.active_link_training = !!(pd_ctrl->control_flags &
>> +                                      USB_PD_CTRL_ACTIVE_LINK_UNIDIR);
>> +
>> +       port->state.alt = NULL;
>> +       port->state.data = &data;
>> +       port->state.mode = TYPEC_MODE_USB4;
>> +
>> +       return typec_mux_set(port->mux, &port->state);
>> +}
>> +
>>  static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
>>                                 uint8_t mux_flags,
>>                                 struct ec_response_usb_pd_control_v2 *pd_ctrl)
>> @@ -514,7 +543,9 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
>>         if (ret)
>>                 return ret;
>>
>> -       if (mux_flags & USB_PD_MUX_TBT_COMPAT_ENABLED) {
>> +       if (mux_flags & USB_PD_MUX_USB4_ENABLED) {
>> +               ret = cros_typec_enable_usb4(typec, port_num, pd_ctrl);
>> +       } else if (mux_flags & USB_PD_MUX_TBT_COMPAT_ENABLED) {
>>                 ret = cros_typec_enable_tbt(typec, port_num, pd_ctrl);
>>         } else if (mux_flags & USB_PD_MUX_DP_ENABLED) {
>>                 ret = cros_typec_enable_dp(typec, port_num, pd_ctrl);
>> --
>> 2.27.0.383.g050319c2ae-goog
>>