RFC on writel and writel_relaxed
okaya at codeaurora.org
Wed Mar 28 00:46:51 AEDT 2018
On 3/27/2018 7:02 AM, Will Deacon wrote:
> - See Documentation/DMA-API.txt for more information on consistent memory.
> + can see it now has ownership. Note that, when using writel(), a prior
> + wmb() is not needed to guarantee that the cache coherent memory writes
> + have completed before writing to the MMIO region. The cheaper
> + writel_relaxed() does not provide this guarantee and must not be used
> + here.
Can we say the same thing for iowrite32() and iowrite32be(). I also see wmb()
in front of these.
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
More information about the Linuxppc-dev