hwmon: (jc42) optionally try to disable the SMBUS timeout

commit 68615eb01f82256c19e41967bfb3eef902f77033 upstream.

With a nxp,se97 chip on an atmel sama5d31 board, the I2C adapter driver
is not always capable of avoiding the 25-35 ms timeout as specified by
the SMBUS protocol. This may cause silent corruption of the last bit of
any transfer, e.g. a one is read instead of a zero if the sensor chip
times out. This also affects the eeprom half of the nxp-se97 chip, where
this silent corruption was originally noticed. Other I2C adapters probably
suffer similar issues, e.g. bit-banging comes to mind as risky...

The SMBUS register in the nxp chip is not a standard Jedec register, but
it is not special to the nxp chips either, at least the atmel chips
have the same mechanism. Therefore, do not special case this on the
manufacturer, it is opt-in via the device property anyway.

Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/hwmon/jc42.txt b/Documentation/devicetree/bindings/hwmon/jc42.txt
index 07a2504..f569db5 100644 (file)
--- a/Documentation/devicetree/bindings/hwmon/jc42.txt
+++ b/Documentation/devicetree/bindings/hwmon/jc42.txt
@@ -34,6 +34,10 @@ Required properties:
 
 - reg: I2C address
 
+Optional properties:
+- smbus-timeout-disable: When set, the smbus timeout function will be disabled.
+                        This is not supported on all chips.
+
 Example:
 
 temp-sensor@1a {

diff --git a/drivers/hwmon/jc42.c b/drivers/hwmon/jc42.c
index 5f11dc0..e5234f9 100644 (file)
--- a/drivers/hwmon/jc42.c
+++ b/drivers/hwmon/jc42.c
@@ -22,6 +22,7 @@
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/bitops.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
@@ -45,6 +46,7 @@ static const unsigned short normal_i2c[] = {
 #define JC42_REG_TEMP          0x05
 #define JC42_REG_MANID         0x06
 #define JC42_REG_DEVICEID      0x07
+#define JC42_REG_SMBUS         0x22 /* NXP and Atmel, possibly others? */
 
 /* Status bits in temperature register */
 #define JC42_ALARM_CRIT_BIT    15
@@ -75,6 +77,9 @@ static const unsigned short normal_i2c[] = {
 #define GT_MANID               0x1c68  /* Giantec */
 #define GT_MANID2              0x132d  /* Giantec, 2nd mfg ID */
 
+/* SMBUS register */
+#define SMBUS_STMOUT           BIT(7)  /* SMBus time-out, active low */
+
 /* Supported chips */
 
 /* Analog Devices */
@@ -495,6 +500,22 @@ static int jc42_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
        data->extended = !!(cap & JC42_CAP_RANGE);
 
+       if (device_property_read_bool(dev, "smbus-timeout-disable")) {
+               int smbus;
+
+               /*
+                * Not all chips support this register, but from a
+                * quick read of various datasheets no chip appears
+                * incompatible with the below attempt to disable
+                * the timeout. And the whole thing is opt-in...
+                */
+               smbus = i2c_smbus_read_word_swapped(client, JC42_REG_SMBUS);
+               if (smbus < 0)
+                       return smbus;
+               i2c_smbus_write_word_swapped(client, JC42_REG_SMBUS,
+                                            smbus | SMBUS_STMOUT);
+       }
+
        config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
        if (config < 0)
                return config;