lkml.org 
[lkml]   [2012]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 19/76] thermal/spear_thermal: replace readl/writel with lighter _relaxed variants
Date
From: Viresh Kumar <viresh.kumar@st.com>

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 | 16 ++++++++--------
1 file 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);
--
1.7.10.rc2.19.gfae9d


\
 
 \ /
  Last update: 2012-03-30 14:21    [W:0.441 / U:36.260 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site