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Subject[PATCH 4.18 094/135] hwmon: (nct6775) Fix RPM output for fan7 on NCT6796D
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@roeck-us.net>

[ Upstream commit f6de298806d9cbc63a4907bca34a06162b9d7dce ]

fan7 on NCT6796D does not have a fan count register; it only has an RPM
register. Switch to using RPM registers to read the fan speed for all
chips supporting it to solve the problem for good.

Reported-by: Robert Kern <ulteq@web.de>
Cc: Robert Kern <ulteq@web.de>
Fixes: 81820059a428 ("hwmon: (nct6775) Add support for NCT6796D")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/hwmon/nct6775.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -502,7 +502,7 @@ static const s8 NCT6779_BEEP_BITS[] = {
30, 31 }; /* intrusion0, intrusion1 */

static const u16 NCT6779_REG_FAN[] = {
- 0x4b0, 0x4b2, 0x4b4, 0x4b6, 0x4b8, 0x4ba, 0x660 };
+ 0x4c0, 0x4c2, 0x4c4, 0x4c6, 0x4c8, 0x4ca, 0x660 };
static const u16 NCT6779_REG_FAN_PULSES[NUM_FAN] = {
0x644, 0x645, 0x646, 0x647, 0x648, 0x649 };

@@ -924,6 +924,11 @@ static unsigned int fan_from_reg16(u16 r
return 1350000U / (reg << divreg);
}

+static unsigned int fan_from_reg_rpm(u16 reg, unsigned int divreg)
+{
+ return reg;
+}
+
static u16 fan_to_reg(u32 fan, unsigned int divreg)
{
if (!fan)
@@ -1284,7 +1289,7 @@ static bool is_word_sized(struct nct6775
case nct6795:
case nct6796:
return reg == 0x150 || reg == 0x153 || reg == 0x155 ||
- ((reg & 0xfff0) == 0x4b0 && (reg & 0x000f) < 0x0b) ||
+ (reg & 0xfff0) == 0x4c0 ||
reg == 0x402 ||
reg == 0x63a || reg == 0x63c || reg == 0x63e ||
reg == 0x640 || reg == 0x642 || reg == 0x64a ||
@@ -3868,7 +3873,7 @@ static int nct6775_probe(struct platform
data->ALARM_BITS = NCT6779_ALARM_BITS;
data->BEEP_BITS = NCT6779_BEEP_BITS;

- data->fan_from_reg = fan_from_reg13;
+ data->fan_from_reg = fan_from_reg_rpm;
data->fan_from_reg_min = fan_from_reg13;
data->target_temp_mask = 0xff;
data->tolerance_mask = 0x07;
@@ -3949,7 +3954,7 @@ static int nct6775_probe(struct platform
data->ALARM_BITS = NCT6791_ALARM_BITS;
data->BEEP_BITS = NCT6779_BEEP_BITS;

- data->fan_from_reg = fan_from_reg13;
+ data->fan_from_reg = fan_from_reg_rpm;
data->fan_from_reg_min = fan_from_reg13;
data->target_temp_mask = 0xff;
data->tolerance_mask = 0x07;

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