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authorKevin Wangtao <kevin.wangtao@linaro.org>2017-10-19 19:05:57 +0200
committerEduardo Valentin <edubezval@gmail.com>2017-10-31 19:32:17 -0700
commite42bbe1160c3b5fcab8d5afcc49d8647adff6c9c (patch)
tree2cb32a560ad38c99675e0e30132a411b19c52691 /drivers/thermal
parent943c0f6abfb6010065b80943356975885a33233c (diff)
downloadlinux-e42bbe1160c3b5fcab8d5afcc49d8647adff6c9c.tar.bz2
thermal/drivers/hisi: Use round up step value
Use round up division to ensure the programmed value of threshold and the lag are not less than what we set, and in order to keep the accuracy while using round up division, the step value should be a rounded up value. There is no need to use hisi_thermal_round_temp. Signed-off-by: Kevin Wangtao <kevin.wangtao@linaro.org> Tested-by: Daniel Lezcano <daniel.lezcano@linaro.org> # hikey6220 Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/hisi_thermal.c22
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
index 373bb6d094a1..65f9e5c80741 100644
--- a/drivers/thermal/hisi_thermal.c
+++ b/drivers/thermal/hisi_thermal.c
@@ -40,7 +40,7 @@
#define HISI_TEMP_BASE (-60000)
#define HISI_TEMP_RESET (100000)
-#define HISI_TEMP_STEP (784)
+#define HISI_TEMP_STEP (785)
#define HISI_TEMP_LAG (3500)
#define HISI_MAX_SENSORS 4
@@ -63,19 +63,19 @@ struct hisi_thermal_data {
/*
* The temperature computation on the tsensor is as follow:
* Unit: millidegree Celsius
- * Step: 255/200 (0.7843)
+ * Step: 200/255 (0.7843)
* Temperature base: -60°C
*
- * The register is programmed in temperature steps, every step is 784
+ * The register is programmed in temperature steps, every step is 785
* millidegree and begins at -60 000 m°C
*
* The temperature from the steps:
*
- * Temp = TempBase + (steps x 784)
+ * Temp = TempBase + (steps x 785)
*
* and the steps from the temperature:
*
- * steps = (Temp - TempBase) / 784
+ * steps = (Temp - TempBase) / 785
*
*/
static inline int hisi_thermal_step_to_temp(int step)
@@ -85,13 +85,7 @@ static inline int hisi_thermal_step_to_temp(int step)
static inline int hisi_thermal_temp_to_step(int temp)
{
- return (temp - HISI_TEMP_BASE) / HISI_TEMP_STEP;
-}
-
-static inline int hisi_thermal_round_temp(int temp)
-{
- return hisi_thermal_step_to_temp(
- hisi_thermal_temp_to_step(temp));
+ return DIV_ROUND_UP(temp - HISI_TEMP_BASE, HISI_TEMP_STEP);
}
/*
@@ -127,7 +121,7 @@ static inline int hisi_thermal_round_temp(int temp)
*/
static inline void hisi_thermal_set_lag(void __iomem *addr, int value)
{
- writel((value / HISI_TEMP_STEP) & 0x1F, addr + TEMP0_LAG);
+ writel(DIV_ROUND_UP(value, HISI_TEMP_STEP) & 0x1F, addr + TEMP0_LAG);
}
static inline void hisi_thermal_alarm_clear(void __iomem *addr, int value)
@@ -274,7 +268,7 @@ static int hisi_thermal_register_sensor(struct platform_device *pdev,
for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
if (trip[i].type == THERMAL_TRIP_PASSIVE) {
- sensor->thres_temp = hisi_thermal_round_temp(trip[i].temperature);
+ sensor->thres_temp = trip[i].temperature;
break;
}
}