commit de716e32e61fae5d1f0d000008d3f641cec5c9dd
author Viresh Kumar <viresh.kumar@st.com> Wed Mar 21 12:55:03 2012 -0700
committer Len Brown <len.brown@intel.com> Thu Mar 22 01:06:43 2012 -0400
tree ca4d94ded63a6a3da3313dd54e16465f60d65659
parent 6a92c36688bd6d8e68e19ca9b5e41e8197921b59

thermal/spear_thermal: replace readl/writel with lighter _relaxed variants

readl/writel versions for ARM contain memory barrier instruction for
synchronizing DMA buffers.  These are not required at least on this
module.  So use lighter _relaxed variants.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/thermal/spear_thermal.c

diff --git a/drivers/thermal/spear_thermal.c b/drivers/thermal/spear_thermal.c
index 880bf28..be94413 100644
--- a/drivers/thermal/spear_thermal.c
+++ b/drivers/thermal/spear_thermal.c
@@ -46,7 +46,7 @@
 	 * Data are ready to be read after 628 usec from POWERDOWN signal
 	 * (PDN) = 1
 	 */
-	*temp = (readl(stdev->thermal_base) & 0x7F) * MD_FACTOR;
+	*temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR;
 	return 0;
 }
 
@@ -63,8 +63,8 @@
 	unsigned int actual_mask = 0;
 
 	/* Disable SPEAr Thermal Sensor */
-	actual_mask = readl(stdev->thermal_base);
-	writel(actual_mask & ~stdev->flags, stdev->thermal_base);
+	actual_mask = readl_relaxed(stdev->thermal_base);
+	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
 
 	clk_disable(stdev->clk);
 	dev_info(dev, "Suspended.\n");
@@ -87,8 +87,8 @@
 	}
 
 	/* Enable SPEAr Thermal Sensor */
-	actual_mask = readl(stdev->thermal_base);
-	writel(actual_mask | stdev->flags, stdev->thermal_base);
+	actual_mask = readl_relaxed(stdev->thermal_base);
+	writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base);
 
 	dev_info(dev, "Resumed.\n");
 
@@ -145,7 +145,7 @@
 	}
 
 	stdev->flags = pdata->thermal_flags;
-	writel(stdev->flags, stdev->thermal_base);
+	writel_relaxed(stdev->flags, stdev->thermal_base);
 
 	spear_thermal = thermal_zone_device_register("spear_thermal", 0,
 				stdev, &ops, 0, 0, 0, 0);
@@ -180,8 +180,8 @@
 	platform_set_drvdata(pdev, NULL);
 
 	/* Disable SPEAr Thermal Sensor */
-	actual_mask = readl(stdev->thermal_base);
-	writel(actual_mask & ~stdev->flags, stdev->thermal_base);
+	actual_mask = readl_relaxed(stdev->thermal_base);
+	writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
 
 	clk_disable(stdev->clk);
 	clk_put(stdev->clk);