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From: Adrian Chadd <adrian@FreeBSD.org>
Date: Thu, 29 Dec 2016 17:31:07 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r310780 - head/sys/mips/atheros
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Author: adrian
Date: Thu Dec 29 17:31:07 2016
New Revision: 310780
URL: https://svnweb.freebsd.org/changeset/base/310780

Log:
  [ar71xx] put in an implicit read-after-write to flush things out.
  
  Note: I may need to revisit this for mips74k.

Modified:
  head/sys/mips/atheros/ar71xxreg.h

Modified: head/sys/mips/atheros/ar71xxreg.h
==============================================================================
--- head/sys/mips/atheros/ar71xxreg.h	Thu Dec 29 16:35:49 2016	(r310779)
+++ head/sys/mips/atheros/ar71xxreg.h	Thu Dec 29 17:31:07 2016	(r310780)
@@ -527,7 +527,10 @@ typedef enum {
     *((volatile uint32_t *)MIPS_PHYS_TO_KSEG1((reg)))
 
 #define ATH_WRITE_REG(reg, val) \
-    *((volatile uint32_t *)MIPS_PHYS_TO_KSEG1((reg))) = (val)
+    do { \
+      *((volatile uint32_t *)MIPS_PHYS_TO_KSEG1((reg))) = (val); \
+      (void) ATH_READ_REG(reg); \
+    } while (0)
 
 static inline void
 ar71xx_ddr_flush(uint32_t reg)