linux-kernel - [PATCH 4.18 096/135] hwmon: (nct6775) Use different register to get fan RPM for fan7

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Date:   Tue, 16 Oct 2018 19:05:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Robert Kern <ulteq@....de>,
        Guenter Roeck <linux@...ck-us.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 096/135] hwmon: (nct6775) Use different register to get fan RPM for fan7

4.18-stable review patch.  If anyone has any objections, please let me know.

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

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

[ Upstream commit 55066354285b36ee09dc50e2527f43a97c567177 ]

The documented register to retrieve the fan RPM for fan7 is found
to be unreliable at least with NCT6796D revision 3. Let's use
register 0x4ce instead. This is undocumented for NCT6796D, but
documented for NCT6797D and NCT6798D and known to be working.

Reported-by: Robert Kern <ulteq@....de>
Cc: Robert Kern <ulteq@....de>
Fixes: 81820059a428 ("hwmon: (nct6775) Add support for NCT6796D")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/hwmon/nct6775.c |    4 ++--
 1 file changed, 2 insertions(+), 2 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[] = {
-	0x4c0, 0x4c2, 0x4c4, 0x4c6, 0x4c8, 0x4ca, 0x660 };
+	0x4c0, 0x4c2, 0x4c4, 0x4c6, 0x4c8, 0x4ca, 0x4ce };
 static const u16 NCT6779_REG_FAN_PULSES[NUM_FAN] = {
 	0x644, 0x645, 0x646, 0x647, 0x648, 0x649 };
 
@@ -1293,7 +1293,7 @@ static bool is_word_sized(struct nct6775
 		  reg == 0x402 ||
 		  reg == 0x63a || reg == 0x63c || reg == 0x63e ||
 		  reg == 0x640 || reg == 0x642 || reg == 0x64a ||
-		  reg == 0x64c || reg == 0x660 ||
+		  reg == 0x64c ||
 		  reg == 0x73 || reg == 0x75 || reg == 0x77 || reg == 0x79 ||
 		  reg == 0x7b || reg == 0x7d;
 	}