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usb: ehci: Fix accessors for big-endian platforms and descriptors 

Commit 9000eddbae ("drivers/usb/ehci: Use platform-specific accessors")
broke USB 2.0 on big-endian platforms because for them writel/readl()
does automatic conversion of BE data to LE.

Proper implementation requires to use "raw" variant of these accessors
which read/write data without messing with endianess.

While at it replace cpu_to_be32() to be32_to_cpu() in readl() to
keep sane semantics.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Marek Vasut <marex@denx.de>
Reported-by: Vladimir Boroda <boroda@yahoo.com>
This commit is contained in:
Alexey Brodkin 2017-11-17 16:26:30 +03:00 committed by Marek Vasut
parent abd7cedb19
commit 9829ce2ff2
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/host/ehci.h
View File

@ -101,11 +101,11 @@ struct usb_linux_config_descriptor {
} __attribute__ ((packed));
#if defined CONFIG_EHCI_DESC_BIG_ENDIAN
#define ehci_readl(x) cpu_to_be32(readl(x))
#define ehci_writel(a, b) writel(cpu_to_be32(b), a)
#define ehci_readl(x) be32_to_cpu(__raw_readl(x))
#define ehci_writel(a, b) __raw_writel(cpu_to_be32(b), a)
#else
#define ehci_readl(x) cpu_to_le32(readl(x))
#define ehci_writel(a, b) writel(cpu_to_le32(b), a)
#define ehci_readl(x) readl(x)
#define ehci_writel(a, b) writel(b, a)
#endif
#if defined CONFIG_EHCI_MMIO_BIG_ENDIAN