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Commit de716e32 authored by Viresh Kumar's avatar Viresh Kumar Committed by Len Brown
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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: default avatarViresh Kumar <viresh.kumar@st.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 6a92c366

drivers/thermal/spear_thermal.c

+8 −8
Original line number Diff line number Diff line
@@ -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);