linux-kernel - Re: [PATCH] net: usb: smsc95xx: configure external LEDs function for EVB-LAN8670-USB

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Date: Wed, 22 May 2024 19:54:23 +0100
From: Simon Horman <horms@...nel.org>
To: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
Cc: steve.glendinning@...well.net, UNGLinuxDriver@...rochip.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: usb: smsc95xx: configure external LEDs function for
 EVB-LAN8670-USB

On Wed, May 22, 2024 at 07:38:17PM +0530, Parthiban Veerasooran wrote:
> By default, LAN9500A configures the external LEDs to the below function.
> nSPD_LED -> Speed Indicator
> nLNKA_LED -> Link and Activity Indicator
> nFDX_LED -> Full Duplex Link Indicator
> 
> But, EVB-LAN8670-USB uses the below external LEDs function which can be
> enabled by writing 1 to the LED Select (LED_SEL) bit in the LAN9500A.
> nSPD_LED -> Speed Indicator
> nLNKA_LED -> Link Indicator
> nFDX_LED -> Activity Indicator
> 
> Signed-off-by: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
> ---
>  drivers/net/usb/smsc95xx.c | 12 ++++++++++++
>  drivers/net/usb/smsc95xx.h |  1 +
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
> index cbea24666479..05975461bf10 100644
> --- a/drivers/net/usb/smsc95xx.c
> +++ b/drivers/net/usb/smsc95xx.c
> @@ -1006,6 +1006,18 @@ static int smsc95xx_reset(struct usbnet *dev)
>  	/* Configure GPIO pins as LED outputs */
>  	write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
>  		LED_GPIO_CFG_FDX_LED;
> +
> +	/* Set LED Select (LED_SEL) bit for the external LED pins functionality
> +	 * in the Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet device which
> +	 * uses the below LED function.
> +	 * nSPD_LED -> Speed Indicator
> +	 * nLNKA_LED -> Link Indicator
> +	 * nFDX_LED -> Activity Indicator
> +	 */
> +	if (dev->udev->descriptor.idVendor == 0x184F &&
> +	    dev->udev->descriptor.idProduct == 0x0051)

Hi Parthiban,

There seems to be an endian missmatch here.
The type of .idVendor and .idProduct is __le16,
but here they are compared against host byte-order integers.

Flagged by Sparse.

> +		write_buf |= LED_GPIO_CFG_LED_SEL;
> +
>  	ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
>  	if (ret < 0)
>  		return ret;

..

-- 
pw-bot: changes-requested