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H A D | io.h | abbbbc83 Fri Feb 22 12:04:52 CST 2019 Will Deacon <will.deacon@arm.com> asm-generic/io: Pass result of I/O accessor to __io_[p]ar()
The inX() and readX() I/O accessors must enforce ordering against subsequent calls to the delay() routines, so that a read-back from a device can be used to postpone a subsequent write to the same device.
On some architectures, including arm64, this ordering can only be achieved by creating a dependency on the value returned by the I/O accessor operation, so we need to pass the value we read to the __io_par() and __io_ar() macros in these cases.
Acked-by: Arnd Bergmann <arnd@arndb.de> Reported-by: Andrew Murray <andrew.murray@arm.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> abbbbc83 Fri Feb 22 12:04:52 CST 2019 Will Deacon <will.deacon@arm.com> asm-generic/io: Pass result of I/O accessor to __io_[p]ar() The inX() and readX() I/O accessors must enforce ordering against subsequent calls to the delay() routines, so that a read-back from a device can be used to postpone a subsequent write to the same device. On some architectures, including arm64, this ordering can only be achieved by creating a dependency on the value returned by the I/O accessor operation, so we need to pass the value we read to the __io_par() and __io_ar() macros in these cases. Acked-by: Arnd Bergmann <arnd@arndb.de> Reported-by: Andrew Murray <andrew.murray@arm.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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