From 6c47660e3c3acad9401f8fe1d288d4234f05549c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Amadeusz=20S=C5=82awi=C5=84ski?= <amadeuszx.slawinski@linux.intel.com>
Date: Thu, 7 May 2020 09:34:05 -0400
Subject: [PATCH] ASoC: Intel: Use readq to read 64 bit registers
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Git-commit: 6c47660e3c3acad9401f8fe1d288d4234f05549c
Patch-mainline: v5.8-rc1
References: jsc#SLE-16518

In order to fix issue described in:
"asoc: Intel: sst: ipc command timeout"
https://patchwork.kernel.org/patch/11482829/

use readq function, which is meant to read 64 bit values from registers.
On 32 bit platforms it falls back to two readl calls.

Reported-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Tested-by: Brent Lu <brent.lu@intel.com>
Acked-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20200507133405.32251-2-amadeuszx.slawinski@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/intel/common/sst-dsp.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/sound/soc/intel/common/sst-dsp.c b/sound/soc/intel/common/sst-dsp.c
index ec66be269b69..36c077aa386e 100644
--- a/sound/soc/intel/common/sst-dsp.c
+++ b/sound/soc/intel/common/sst-dsp.c
@@ -10,7 +10,7 @@
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
-#include <linux/io.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/delay.h>
 
 #include "sst-dsp.h"
@@ -34,16 +34,13 @@ EXPORT_SYMBOL_GPL(sst_shim32_read);
 
 void sst_shim32_write64(void __iomem *addr, u32 offset, u64 value)
 {
-	memcpy_toio(addr + offset, &value, sizeof(value));
+	writeq(value, addr + offset);
 }
 EXPORT_SYMBOL_GPL(sst_shim32_write64);
 
 u64 sst_shim32_read64(void __iomem *addr, u32 offset)
 {
-	u64 val;
-
-	memcpy_fromio(&val, addr + offset, sizeof(val));
-	return val;
+	return readq(addr + offset);
 }
 EXPORT_SYMBOL_GPL(sst_shim32_read64);
 
-- 
2.16.4