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Retry fan speed read when we see zero RPM, to make sure it's not a glitch (#174)

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This commit is contained in:
Zi Zhou
2017-03-09 11:53:41 -08:00
committed by Steven Noble
parent a2ef3b9380
commit af4e3b1066
1 changed files with 18 additions and 7 deletions
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25
packages/platforms/accton/x86-64/x86-64-accton-as6712-32x/modules/builds/x86-64-accton-as6712-32x-fan.c
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@@ -32,6 +32,7 @@
#include <linux/kthread.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#define FAN_MAX_NUMBER 5
#define FAN_SPEED_CPLD_TO_RPM_STEP 150
@@ -269,7 +270,8 @@ static void accton_as6712_32x_fan_update_device(struct device *dev)
{
int speed, r_speed, fault, r_fault, direction, ctrl_speed;
int i;
int retry_count = 5;
mutex_lock(&fan_data->update_lock);
DEBUG_PRINT("Starting accton_as6712_32x_fan update \n");
@@ -314,12 +316,21 @@ static void accton_as6712_32x_fan_update_device(struct device *dev)
/* fan speed
*/
speed = accton_as6712_32x_fan_read_value(fan_speed_reg[i]);
r_speed = accton_as6712_32x_fan_read_value(fanr_speed_reg[i]);
if ( (speed < 0) || (r_speed < 0) )
{
DEBUG_PRINT("[Error!!][%s][%d] \n", __FUNCTION__, __LINE__);
goto _exit; /* error */
while (retry_count) {
retry_count--;
speed = accton_as6712_32x_fan_read_value(fan_speed_reg[i]);
r_speed = accton_as6712_32x_fan_read_value(fanr_speed_reg[i]);
if ( (speed < 0) || (r_speed < 0) )
{
DEBUG_PRINT("[Error!!][%s][%d] \n", __FUNCTION__, __LINE__);
goto _exit; /* error */
}
if ( (speed == 0) || (r_speed == 0) )
{
msleep(200);
continue;
}
break;
}
DEBUG_PRINT("[fan%d:] speed:%d, r_speed=%d \n", i, speed, r_speed);