Messages in this thread | | | Date | Wed, 9 Jan 2019 10:14:14 -0500 (EST) | From | Alan Stern <> | Subject | RE: [PATCH 2/3] usb: ehci: fsl: Update register accessing for arm/arm64 platforms |
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On Wed, 9 Jan 2019, Ran Wang wrote:
> > Why do you change this writel() into iowrite32be() but leave other instances > > of writel() unchanged? Was this a mistake? > > Yes, I didn't notice there are other writel() used in this file. > However, as I know, on both powerpc and arm SoC, EHCI FSL IP's memory mapped > register block is always Big-endian, so I'd like to replace all writel() with iowrite32be() > in this file. Is it necessary? > > Or I just replace them with ehci_writel() and select CONFIG_USB_EHCI_BIG_ENDIAN_MMIO?
That should work okay. ehci_fsl_setup() sets ehci->big_endian_desc and ehci->big_endian_mmio according to the platform data, so you just have to make sure the platform data is initialized correctly.
Alan Stern
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