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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>
This commit is contained in:
Viresh Kumar 2012-03-21 12:55:03 -07:00 committed by Len Brown
parent 6a92c36688
commit de716e32e6
1 changed files with 8 additions and 8 deletions
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16
drivers/thermal/spear_thermal.c
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@ -46,7 +46,7 @@ static inline int thermal_get_temp(struct thermal_zone_device *thermal,
* 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 @@ static int spear_thermal_suspend(struct device *dev)
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 @@ static int spear_thermal_resume(struct device *dev)
}
/* 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 @@ static int spear_thermal_probe(struct platform_device *pdev)
}
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 @@ static int spear_thermal_exit(struct platform_device *pdev)
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);