linux-kernel - Re: [PATCH 1/1] ucsi_ccg: Check DEV

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Date:   Mon, 10 Jan 2022 13:40:49 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Wayne Chang <waynec@...dia.com>
Cc:     gregkh@...uxfoundation.org, singhanc@...dia.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] ucsi_ccg: Check DEV_INT bit only when starting CCG4

Hi,

On Fri, Jan 07, 2022 at 05:24:55PM +0800, Wayne Chang wrote:
> From: Sing-Han Chen <singhanc@...dia.com>
> 
> after driver sending the UCSI_START cmd, CCGx would
> clear Bit 0:Device Interrupt in the INTR_REG if CCGX
> reset successfully.
> 
> however, there might be a chance that other bits in
> INTR_REG are not cleared due to internal data queued
> in PPM and cause the driver thinks CCGx reset failed.
> 
> the commit checks bit 0 in INTR_REG and ignore other
> bits. ucsi driver would reset PPM later.
> 
> Signed-off-by: Sing-Han Chen <singhanc@...dia.com>
> Signed-off-by: WayneChang <waynec@...dia.com>
                 ^^^^^^^^^^
You probable should have a space there. In any case, FWIW:

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

> ---
>  drivers/usb/typec/ucsi/ucsi_ccg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
> index bff96d64dddf..6db7c8ddd51c 100644
> --- a/drivers/usb/typec/ucsi/ucsi_ccg.c
> +++ b/rivers/usb/typec/ucsi/ucsi_ccg.c
> @@ -325,7 +325,7 @@ static int ucsi_ccg_init(struct ucsi_ccg *uc)
>  		if (status < 0)
>  			return status;
>  
> -		if (!data)
> +		if (!(data & DEV_INT))
>  			return 0;
>  
>  		status = ccg_write(uc, CCGX_RAB_INTR_REG, &data, sizeof(data));
> -- 
> 2.25.1

thanks,

-- 
heikki