diff options
| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2014-01-31 01:27:49 +0400 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2014-01-31 01:27:49 +0400 |
| commit | f7b2e4032d52deff480e0c303fbd9180276f8dfc (patch) | |
| tree | 3a5dd864b4f0c056cc5285a3c96cbf5559183ed5 /drivers/usb/host/xhci.h | |
| parent | 477632dff5c7deaa165701f441e9a4bd33e22b18 (diff) | |
| download | linux-f7b2e4032d52deff480e0c303fbd9180276f8dfc.tar.xz | |
Revert "xhci: replace xhci_read_64() with readq()"
This reverts commit e8b373326d8efcaf9ec1da8b618556c89bd5ffc4. Many xHCI
host controllers can only handle 32-bit addresses, and writing 64-bits
at a time causes them to fail. Reading 64-bits at a time may also cause
them to return 0xffffffff, so revert this commit as well.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb/host/xhci.h')
| -rw-r--r-- | drivers/usb/host/xhci.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 60def15d129c..9154fd6cf24c 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -28,8 +28,6 @@ #include <linux/kernel.h> #include <linux/usb/hcd.h> -#include <asm-generic/io-64-nonatomic-lo-hi.h> - /* Code sharing between pci-quirks and xhci hcd */ #include "xhci-ext-caps.h" #include "pci-quirks.h" @@ -1614,6 +1612,14 @@ static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci) * xHCI implementations that do not support 64-bit address pointers will ignore * the high dword, and write order is irrelevant. */ +static inline u64 xhci_read_64(const struct xhci_hcd *xhci, + __le64 __iomem *regs) +{ + __u32 __iomem *ptr = (__u32 __iomem *) regs; + u64 val_lo = readl(ptr); + u64 val_hi = readl(ptr + 1); + return val_lo + (val_hi << 32); +} static inline void xhci_write_64(struct xhci_hcd *xhci, const u64 val, __le64 __iomem *regs) { |