fix unreliable initialization of limit registers by

adding a rather large delay after resetting the device
      via register 0x40. There is obviously a state machine
      in the chip that takes a while to run after you reset it.
      Figured out the delay time by trial and error.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1168 7894878c-1315-0410-8ee3-d5d059ff63e0

CHANGES

@@ -17,6 +17,9 @@ ask CVS about it:
 
 -----------------------------------------------------------------------------
 
+2.6.2 (2001????)
+  Module via686a: Make limit initializations reliable
+
 2.6.1 (20010830)
   File BUGS: Updated
   File doc/FAQ: More updates and additions

kernel/chips/via686a.c

@@ -40,6 +40,7 @@
 #include <asm/errno.h>
 #include <asm/io.h>
 #include <linux/types.h>
+#include <linux/delay.h>
 #include <linux/i2c.h>
 #include "version.h"
 #include "sensors.h"
@@ -680,6 +681,13 @@ void via686a_init_client(struct i2c_client *client)
 	/* Reset the device */
 	via686a_write_value(client, VIA686A_REG_CONFIG, 0x80);
 
+	/* Have to wait for reset to complete or else the following
+	   initializations won't work reliably. The delay was arrived at
+	   empirically, the datasheet doesn't tell you.
+	   Waiting for the reset bit to clear doesn't work, it
+	   clears in about 2-4 udelays and that isn't nearly enough. */
+	udelay(50);
+
 	via686a_write_value(client, VIA686A_REG_IN_MIN(0),
 			    IN_TO_REG(VIA686A_INIT_IN_MIN_0, 0));
 	via686a_write_value(client, VIA686A_REG_IN_MAX(0),