From d6a6af2c181400aade59417e698c7cd9bec8804e Mon Sep 17 00:00:00 2001 From: Ian Munsie Date: Mon, 8 Dec 2014 19:17:59 +1100 Subject: [PATCH] cxl: Disable AFU debug flag Upon inspection of the implementation specific registers, it was discovered that the high bit of the implementation specific RXCTL register was enabled, which enables the DEADB00F debug feature. The debug feature causes MMIO reads to a disabled AFU to respond with 0xDEADB00F instead of all Fs. In general this should not be visible as the kernel will only allow MMIO access to enabled AFUs, but there may be some circumstances where an AFU may become disabled while it is use. One such case would be an AFU designed to only be used in the dedicated process mode and to disable itself after it has completed it's work (however even in that case the effects of this debug flag would be limited as the userspace application must have completed any required MMIO accesses before the AFU disables itself with or without the flag). This patch removes the debug flag and replaces the magic value programmed into this register with a preprocessor define so it is clearer what the rest of this initialisation does. Signed-off-by: Ian Munsie Signed-off-by: Michael Ellerman --- Reading git-format-patch failed