[PATCH] w83781d: Don't reset the chip by default

Stop resetting the chip on load by default, so as to preserve the BIOS
initializations. Same was done in the w83627hf driver some times ago
for the same reasons.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/Documentation/hwmon/w83781d b/Documentation/hwmon/w83781d
index ac155d8b0fef845a32d7db11fba7f5043e67f497..b1e9f80098ee55af95aab64d26564f7fdfefa7f0 100644 (file)
--- a/Documentation/hwmon/w83781d
+++ b/Documentation/hwmon/w83781d
@@ -36,6 +36,11 @@ Module parameters
   Use 'init=0' to bypass initializing the chip.
   Try this if your computer crashes when you load the module.
 
+* reset int
+  (default 0)
+  The driver used to reset the chip on load, but does no more. Use
+  'reset=1' to restore the old behavior. Report if you need to do this.
+
 force_subclients=bus,caddr,saddr,saddr
   This is used to force the i2c addresses for subclients of
   a certain chip. Typical usage is `force_subclients=0,0x2d,0x4a,0x4b'

diff --git a/drivers/hwmon/w83781d.c b/drivers/hwmon/w83781d.c
index 782117817526accac777032bc03dcc6209a20c34..8b17132f6b946bc63b1e0262186a981698680e04 100644 (file)
--- a/drivers/hwmon/w83781d.c
+++ b/drivers/hwmon/w83781d.c
@@ -57,6 +57,10 @@ I2C_CLIENT_INSMOD_5(w83781d, w83782d, w83783s, w83627hf, as99127f);
 I2C_CLIENT_MODULE_PARM(force_subclients, "List of subclient addresses: "
                    "{bus, clientaddr, subclientaddr1, subclientaddr2}");
 
+static int reset;
+module_param(reset, bool, 0);
+MODULE_PARM_DESC(reset, "Set to one to reset chip on load");
+
 static int init = 1;
 module_param(init, bool, 0);
 MODULE_PARM_DESC(init, "Set to zero to bypass chip initialization");
@@ -1460,8 +1464,17 @@ w83781d_init_client(struct i2c_client *client)
        int type = data->type;
        u8 tmp;
 
-       if (init && type != as99127f) { /* this resets registers we don't have
+       if (reset && type != as99127f) { /* this resets registers we don't have
                                           documentation for on the as99127f */
+               /* Resetting the chip has been the default for a long time,
+                  but it causes the BIOS initializations (fan clock dividers,
+                  thermal sensor types...) to be lost, so it is now optional.
+                  It might even go away if nobody reports it as being useful,
+                  as I see very little reason why this would be needed at
+                  all. */
+               dev_info(&client->dev, "If reset=1 solved a problem you were "
+                        "having, please report!\n");
+
                /* save these registers */
                i = w83781d_read_value(client, W83781D_REG_BEEP_CONFIG);
                p = w83781d_read_value(client, W83781D_REG_PWMCLK12);
@@ -1478,6 +1491,13 @@ w83781d_init_client(struct i2c_client *client)
                w83781d_write_value(client, W83781D_REG_BEEP_INTS2, 0);
        }
 
+       /* Disable power-on abnormal beep, as advised by the datasheet.
+          Already done if reset=1. */
+       if (init && !reset && type != as99127f) {
+               i = w83781d_read_value(client, W83781D_REG_BEEP_CONFIG);
+               w83781d_write_value(client, W83781D_REG_BEEP_CONFIG, i | 0x80);
+       }
+
        data->vrm = vid_which_vrm();
 
        if ((type != w83781d) && (type != as99127f)) {