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Message-ID: <20190130074059.GA29458@lst.de>
Date: Wed, 30 Jan 2019 08:40:59 +0100
From: Christoph Hellwig <hch@....de>
To: Hanjun Guo <guohanjun@...wei.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Robin Murphy <robin.murphy@....com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Bjorn Helgaas <helgaas@...nel.org>,
Christoph Hellwig <hch@....de>, linux-usb@...r.kernel.org,
linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, linuxarm@...wei.com,
John Garry <john.garry@...wei.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
anthony.jebson@...wei.com, Hanjun Guo <hanjun.guo@...aro.org>
Subject: Re: [RFC PATCH] USB: PCI: set 32bit DMA mask for PCI based USB
controllers
On Wed, Jan 30, 2019 at 03:01:54PM +0800, Hanjun Guo wrote:
> This is the RFC version, I'm not sure this is the best solution,
> comments are warmly welcomed.
>
> Thanks
> Hanjun
>
> drivers/usb/core/hcd-pci.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
> index 0343246..a9c33e6 100644
> --- a/drivers/usb/core/hcd-pci.c
> +++ b/drivers/usb/core/hcd-pci.c
> @@ -188,6 +188,10 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
> if (pci_enable_device(dev) < 0)
> return -ENODEV;
>
> + retval = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
> + if (retval)
> + return retval;
dma_coerce_mask_and_coherent is only for platform devices (and I'm
not sure it is a good idea to start with, but that is a different
story).
PCI device should have the dma_mask pointer set already, so you should
use dma_set_mask_and_coherent here.
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