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

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Date:   Mon, 11 May 2020 15:49:17 +0700
From:   Lars Melin <larsm17@...il.com>
To:     Prashant Malani <pmalani@...omium.org>,
        linux-kernel@...r.kernel.org
Cc:     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

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

>   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