Hello,
The nct6776f and nct6775f support debouncing the fan RPM signal, this can
help improve the stability of th RPM signal for some fans (Arctic cooling
fans for example).
This patch adds a module parameter fan_debounce, which when set to 1 enables
debounce for all fans that the chip supports.
I've based this diff on the standalone w83627ehf driver from 7.3.2011 09:54,
using diff -uN standardversion myversion
Regards
Ian Dobson
--- w83627ehf.c.std 2011-03-04 17:01:18.630954100 +0100
+++ w83627ehf.c 2011-03-07 18:22:33.878852000 +0100
@@ -79,6 +79,10 @@
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");
+static unsigned short fan_debounce;
+module_param(fan_debounce, ushort, 0);
+MODULE_PARM_DESC(fan_debounce, "Enable de-bouncing for fan RPM signal");
+
#define DRVNAME "w83627ehf"
/*
@@ -236,6 +240,7 @@
static const u16 NCT6775_REG_FAN_STEP_OUTPUT[] = { 0x10b, 0x20b, 0x30b };
static const u16 NCT6775_REG_FAN[] = { 0x630, 0x632, 0x634, 0x636, 0x638 };
static const u16 NCT6776_REG_FAN_MIN[] = { 0x63a, 0x63c, 0x63e, 0x640,
0x642};
+static const u8 NCT6776_REG_FAN_DEBOUNCE = 0xf0;
static const u16 NCT6775_REG_TEMP[]
= { 0x27, 0x150, 0x250, 0x73, 0x75, 0x77, 0x62b, 0x62c, 0x62d };
@@ -2297,6 +2302,7 @@
static const char __initdata sio_name_NCT6776[] = "NCT6776F";
u16 val;
+ u8 tmp;
const char *sio_name;
superio_enter(sioaddr);
@@ -2369,6 +2375,22 @@
pr_info("Found %s chip at %#x\n", sio_name, *addr);
sio_data->sioreg = sioaddr;
+ if ( fan_debounce == 1 && (sio_data->kind == nct6775
+ || sio_data->kind == nct6776 )) {
+ superio_enter(sio_data->sioreg);
+ superio_select(sio_data->sioreg, W83627EHF_LD_HWM);
+ tmp = superio_inb(sio_data->sioreg, NCT6776_REG_FAN_DEBOUNCE );
+ if ( sio_data->kind == nct6776 ) {
+ superio_outb(sio_data->sioreg, NCT6776_REG_FAN_DEBOUNCE,
+ 0x3e | tmp );
+ } else {
+ superio_outb(sio_data->sioreg, NCT6776_REG_FAN_DEBOUNCE,
+ 0x1e | tmp );
+ }
+ superio_exit(sio_data->sioreg);
+ pr_info("Enabling fan debounce for chip %s\n", sio_name);
+ }
+
return 0;
}
_______________________________________________
lm-sensors mailing list
lm-sensors@xxxxxxxxxxxxxx
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
