netdev - Re: [PATCH net] net: airoha: Fix loopback mode configuration for GDM2 port

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Message-ID: <7b460ea8-c340-4ab8-96d9-43568227ee07@redhat.com>
Date: Tue, 7 Oct 2025 15:07:14 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>, Andrew Lunn
 <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 netdev@...r.kernel.org
Subject: Re: [PATCH net] net: airoha: Fix loopback mode configuration for GDM2
 port

On 10/5/25 4:52 PM, Lorenzo Bianconi wrote:
> Add missing configuration for loopback mode in airhoha_set_gdm2_loopback
> routine.
> 
> Fixes: 9cd451d414f6e ("net: airoha: Add loopback support for GDM2")
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  drivers/net/ethernet/airoha/airoha_eth.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
> index 81ea01a652b9c545c348ad6390af8be873a4997f..abe7a23e3ab7a189a3a28007004572719307de90 100644
> --- a/drivers/net/ethernet/airoha/airoha_eth.c
> +++ b/drivers/net/ethernet/airoha/airoha_eth.c
> @@ -1710,7 +1710,9 @@ static void airhoha_set_gdm2_loopback(struct airoha_gdm_port *port)
>  	airoha_fe_wr(eth, REG_GDM_RXCHN_EN(2), 0xffff);
>  	airoha_fe_rmw(eth, REG_GDM_LPBK_CFG(2),
>  		      LPBK_CHAN_MASK | LPBK_MODE_MASK | LPBK_EN_MASK,
> -		      FIELD_PREP(LPBK_CHAN_MASK, chan) | LPBK_EN_MASK);
> +		      FIELD_PREP(LPBK_CHAN_MASK, chan) |
> +		      FIELD_PREP(LPBK_MODE_MASK, 7) |

I suggest introducing some human readable macro to replace the above
magic number.

Thanks,

Paolo