linux-kernel - Re: [PATCH v2] usb: typec: mux: intel: Fix DP_HPD

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Date:   Mon, 11 May 2020 02:18:19 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     Lars Melin <larsm17@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Benson Leung <bleung@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        "open list:USB TYPEC CLASS" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v2] usb: typec: mux: intel: Fix DP_HPD_LVL bit field

Hi Lars,

Thanks for reviewing the patch.

On Mon, May 11, 2020 at 1:49 AM Lars Melin <larsm17@...il.com> wrote:
>
> On 5/11/2020 04:39, Prashant Malani wrote:
> > According to the PMC Type C Subsystem (TCSS) Mux programming guide rev
> > 0.6, the PMC HPD request LVL bit field is bit 4.
> > Fix the definition here to match the programming guide.
> >
> > Since this bit field is changing, explicitly define a field for the
> > HPD_HIGH mode data bit.
> >
> > Signed-off-by: Prashant Malani <pmalani@...omium.org>
> > Fixes: 6701adfa9693 ("usb: typec: driver for Intel PMC mux control")
> > Reviewed-by: Benson Leung <bleung@...omium.org>
> > ---
> >
> > Changes in v2:
> > - Fixed bit error in commit message.
> >
> >   drivers/usb/typec/mux/intel_pmc_mux.c | 6 +++---
> >   1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c
> > index 67c5139cfa0d..15074aec94eb 100644
> > --- a/drivers/usb/typec/mux/intel_pmc_mux.c
> > +++ b/drivers/usb/typec/mux/intel_pmc_mux.c
> > @@ -63,6 +63,7 @@ enum {
> >   #define PMC_USB_ALTMODE_DP_MODE_SHIFT       8
> >
> >   /* TBT specific Mode Data bits */
> > +#define PMC_USB_ALTMODE_HPD_HIGH     BIT(14)
> >   #define PMC_USB_ALTMODE_TBT_TYPE    BIT(17)
> >   #define PMC_USB_ALTMODE_CABLE_TYPE  BIT(18)
> >   #define PMC_USB_ALTMODE_ACTIVE_LINK BIT(20)
> > @@ -75,7 +76,7 @@ enum {
> >
> >   /* Display HPD Request bits */
> >   #define PMC_USB_DP_HPD_IRQ          BIT(5)
> > -#define PMC_USB_DP_HPD_LVL           BIT(6)
> > +#define PMC_USB_DP_HPD_LVL           BIT(4)
> >
> Please keep the bits sorted
Sure. Will send a new version of the patch with this change.

Best regards,
>
> >   struct pmc_usb;
> >
> > @@ -158,8 +159,7 @@ pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state)
> >                        PMC_USB_ALTMODE_DP_MODE_SHIFT;
> >
> >       if (data->status & DP_STATUS_HPD_STATE)
> > -             req.mode_data |= PMC_USB_DP_HPD_LVL <<
> > -                              PMC_USB_ALTMODE_DP_MODE_SHIFT;
> > +             req.mode_data |= PMC_USB_ALTMODE_HPD_HIGH;
> >
> >       return pmc_usb_command(port, (void *)&req, sizeof(req));
> >   }
> >
>
> Thanks
> Lars