linux-kernel - Re: [PATCH 2/3] net: stmmac: Restore DT backwards-compatibility

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Message-ID: <20170322123838.GB24523@Red>
Date:   Wed, 22 Mar 2017 13:38:38 +0100
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Joao Pinto <Joao.Pinto@...opsys.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] net: stmmac: Restore DT backwards-compatibility

On Tue, Mar 21, 2017 at 04:12:10PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> Recent changes to support multiple queues in the device tree bindings
> resulted in the number of RX and TX queues to be initialized to zero for
> device trees not adhering to the new bindings.
> 
> Restore backwards-compatibility with those device trees by falling back
> to a single RX and TX queues each.
> 
> Signed-off-by: Thierry Reding <treding@...dia.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 37f550ae76a5..74b0aff79b25 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -143,6 +143,13 @@ static void stmmac_mtl_setup(struct platform_device *pdev,
>  	struct device_node *tx_node;
>  	u8 queue = 0;
>  
> +	/* For backwards-compatibility with device trees that don't have any
> +	 * snps,mtl-rx-config or snps,mtl-tx-config properties, we fall back
> +	 * to one RX and TX queues each.
> +	 */
> +	plat->rx_queues_to_use = 1;
> +	plat->tx_queues_to_use = 1;
> +
>  	rx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-rx-config", 0);
>  	if (!rx_node)
>  		return;
> -- 
> 2.12.0
> 

Tested-by: Corentin Labbe <clabbe.montjoie@...il.com>

Fix one of the reported problem on dwmac-sunxi and dwmac-sun8i
Regards