Re: [PATCH] USB: ehci-tegra: remove PORT_RWC_BITS when setting USB_PORT_FEAT_ENABLE

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Wed, 25 Apr 2012, Stephen Warren wrote:

> From: Stephen Warren <swarren@xxxxxxxxxx>
> 
> In the SetPortFeature/USB_PORT_FEAT_ENABLE case, ehci_hub_control()
> would read from status_reg, modify the value, and write the result back to
> status_reg. This would clear any bits in PORT_RWC_BITS that were set in
> the register. Fix this by masking these bits off before the write.
> 
> This is logically the same change as 6d5f89c "USB: EHCI: remove
> PORT_RWC_BITS when clearing USB_PORT_FEAT_ENABLE", but applied to the
> Tegra driver rather than the USB core.
> 
> Signed-off-by: Stephen Warren <swarren@xxxxxxxxxx>

Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>

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