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[PATCH] ASoC: AMD: add missing include

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The newly added AMD acp driver is missing an include for linux/io.h
and fails to build on ARM:

sound/soc/amd/acp-pcm-dma.c: In function 'acp_reg_read':
sound/soc/amd/acp-pcm-dma.c:83:9: error: implicit declaration of function 'readl' [-Werror=implicit-function-declaration]

This adds the missing line.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
This build error also appeared today on linux-next with ARM randconfig

diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
index cc8b841b69b6..fa0311e4faed 100644
--- a/sound/soc/amd/acp-pcm-dma.c
+++ b/sound/soc/amd/acp-pcm-dma.c
@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 #include <linux/sizes.h>
 #include <linux/pm_runtime.h>
+#include <linux/io.h>
 
 #include <sound/soc.h>
 

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[PATCH] ASoC: AMD: add missing include Arnd Bergmann <arnd@arndb.de> - 2016-01-11 13:20 +0100
  Re: [PATCH] ASoC: AMD: add missing include Mark Brown <broonie@kernel.org> - 2016-01-11 14:10 +0100

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