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Subject[PATCH 1/2] thermal/spear_thermal: Replace readl/writel with lighter _relaxed variants
Date
readl/writel versions for ARM contain memory barrier instruction for
synchronizing DMA buffers. These are not required atleast on this module. So use
lighter _relaxed variants.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
---
Hi Andrew,

These patches are rebased over all three patches you have applied on your tree.

drivers/thermal/spear_thermal.c | 16 ++++++++--------
1 files changed, 8 insertions(+), 8 deletions(-)

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 @@ 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);
--
1.7.8.110.g4cb5d


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