linux-kernel - RE: [PATCH net-next 07/10] net: stmmac: Enable support for

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Message-ID: <BN8PR12MB32669F715CFC897D72F193AFD3FD0@BN8PR12MB3266.namprd12.prod.outlook.com>
Date:   Thu, 27 Jun 2019 07:54:45 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Andrew Lunn <andrew@...n.ch>, Jose Abreu <Jose.Abreu@...opsys.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
Subject: RE: [PATCH net-next 07/10] net: stmmac: Enable support for > 32 Bits
 addressing in XGMAC

From: Andrew Lunn <andrew@...n.ch>

> > +
> > +	if (priv->dma_cap.addr64) {
> > +		ret = dma_set_mask_and_coherent(device,
> > +				DMA_BIT_MASK(priv->dma_cap.addr64));
> > +		if (!ret)
> > +			dev_info(priv->device, "Using %d bits DMA width\n",
> > +				 priv->dma_cap.addr64);
> > +	}
> 
> Hi Jose
> 
> If dma_set_mask_and_coherent() fails, i think you are supposed to fall
> back to 32 bits. So you might want to clear priv->dma_cap.addr64.

Yeah, seems right. Thanks for pointing!