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

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Message-ID: <20200510211607.GA200380@google.com>
Date:   Sun, 10 May 2020 14:16:07 -0700
From:   Benson Leung <bleung@...gle.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, 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] usb: typec: mux: intel: Fix DP_HPD_LVL bit field

Hi Prashant,

On Sun, May 10, 2020 at 01:31:43PM -0700, 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 5.
> 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>


> ---
>  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)
>  
>  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));
>  }
> -- 
> 2.26.2.645.ge9eca65c58-goog
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org

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