linux-kernel - Re: [PATCH] usb: typec: fix "op-sink-microwatt" defaults that were in mW

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Date:   Mon, 20 Jan 2020 13:07:30 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Thomas Hebb <tommyhebb@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>, linux-usb@...r.kernel.org
Subject: Re: [PATCH] usb: typec: fix "op-sink-microwatt" defaults that were
 in mW

Hi Thomas,

On Mon, Jan 20, 2020 at 02:53:16AM -0800, Thomas Hebb wrote:
> commit 8f6244055bd3 ("usb: typec: fusb302: Always provide fwnode for the
> port") and commit 4c912bff46cc ("usb: typec: wcove: Provide fwnode for
> the port") converted a legacy TCPM platdata structure to a more generic
> format. However, one field, denoting required sink power, was specified
> in mW in the old format but uW in the new format. The migration failed
> to account for this, meaning that the values are now 1000x too small.
> 
> Correct the issue by converting the values to uW.
> 
> Signed-off-by: Thomas Hebb <tommyhebb@...il.com>

Thanks for catching this.

You should split this in two, one patch for each driver, and those
should have proper "Fixes:" tags.

I think those should also go to the stable trees, so you'll also need
the stable tag (Cc: stable@...r.kernel.org).

> ---
> 
>  drivers/usb/typec/tcpm/fusb302.c | 2 +-
>  drivers/usb/typec/tcpm/wcove.c   | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
> index ed8655c6af8c..b498960ff72b 100644
> --- a/drivers/usb/typec/tcpm/fusb302.c
> +++ b/drivers/usb/typec/tcpm/fusb302.c
> @@ -1666,7 +1666,7 @@ static const struct property_entry port_props[] = {
>  	PROPERTY_ENTRY_STRING("try-power-role", "sink"),
>  	PROPERTY_ENTRY_U32_ARRAY("source-pdos", src_pdo),
>  	PROPERTY_ENTRY_U32_ARRAY("sink-pdos", snk_pdo),
> -	PROPERTY_ENTRY_U32("op-sink-microwatt", 2500),
> +	PROPERTY_ENTRY_U32("op-sink-microwatt", 2500000),
>  	{ }
>  };
>  
> diff --git a/drivers/usb/typec/tcpm/wcove.c b/drivers/usb/typec/tcpm/wcove.c
> index edc271da14f4..9b745f432c91 100644
> --- a/drivers/usb/typec/tcpm/wcove.c
> +++ b/drivers/usb/typec/tcpm/wcove.c
> @@ -597,7 +597,7 @@ static const struct property_entry wcove_props[] = {
>  	PROPERTY_ENTRY_STRING("try-power-role", "sink"),
>  	PROPERTY_ENTRY_U32_ARRAY("source-pdos", src_pdo),
>  	PROPERTY_ENTRY_U32_ARRAY("sink-pdos", snk_pdo),
> -	PROPERTY_ENTRY_U32("op-sink-microwatt", 15000),
> +	PROPERTY_ENTRY_U32("op-sink-microwatt", 15000000),
>  	{ }
>  };
>  
> -- 
> 2.24.1

thanks,

-- 
heikki