linux-kernel - Re: [PATCH] usb: typec: intel_pmc_mux: Use correct response message bits

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Date:   Tue, 8 Dec 2020 11:38:41 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Utkarsh Patel <utkarsh.h.patel@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        rajmohan.mani@...el.com, azhar.shaikh@...el.com
Subject: Re: [PATCH] usb: typec: intel_pmc_mux: Use correct response message
 bits

On Thu, Dec 03, 2020 at 02:08:13PM -0800, Utkarsh Patel wrote:
> When Intel PMC Mux agent driver receives the response message from PMC, it
> checks for the same response bits for all the mux states.
> Corrected it by checking correct response message bits, Bit 8 & 9 for the
> SAFE Mode and Alternate Modes and Bit 16 & 17 for the Connect and
> Disconnect Modes.
> 
> Signed-off-by: Utkarsh Patel <utkarsh.h.patel@...el.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/mux/intel_pmc_mux.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c
> index aa3211f1c4c3..e58ae8a7fefb 100644
> --- a/drivers/usb/typec/mux/intel_pmc_mux.c
> +++ b/drivers/usb/typec/mux/intel_pmc_mux.c
> @@ -176,6 +176,7 @@ static int hsl_orientation(struct pmc_usb_port *port)
>  static int pmc_usb_command(struct pmc_usb_port *port, u8 *msg, u32 len)
>  {
>  	u8 response[4];
> +	u8 status_res;
>  	int ret;
>  
>  	/*
> @@ -189,9 +190,13 @@ static int pmc_usb_command(struct pmc_usb_port *port, u8 *msg, u32 len)
>  	if (ret)
>  		return ret;
>  
> -	if (response[2] & PMC_USB_RESP_STATUS_FAILURE) {
> -		if (response[2] & PMC_USB_RESP_STATUS_FATAL)
> +	status_res = (msg[0] & 0xf) < PMC_USB_SAFE_MODE ?
> +		     response[2] : response[1];
> +
> +	if (status_res & PMC_USB_RESP_STATUS_FAILURE) {
> +		if (status_res & PMC_USB_RESP_STATUS_FATAL)
>  			return -EIO;
> +
>  		return -EBUSY;
>  	}
>  
> -- 
> 2.17.1

thanks,

-- 
heikki