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From: Brandon Wyman <bjwyman@gmail.com>
To: Joel Stanley <joel@jms.id.au>,
	openbmc@lists.ozlabs.org, Guenter Roeck <linux@roeck-us.net>,
	Jean Delvare <jdelvare@suse.com>,
	linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org,
	Eddie James <eajames@linux.ibm.com>
Cc: Brandon Wyman <bjwyman@gmail.com>
Subject: [PATCH v2] hwmon: (pmbus/ibm-cffps) max_power_out swap changes
Date: Tue, 28 Sep 2021 20:50:51 +0000	[thread overview]
Message-ID: <20210928205051.1222815-1-bjwyman@gmail.com> (raw)

The bytes for max_power_out from the ibm-cffps devices differ in byte
order for some power supplies.

The Witherspoon power supply returns the bytes in MSB/LSB order.

The Rainier power supply returns the bytes in LSB/MSB order.

The Witherspoon power supply uses version cffps1. The Rainier power
supply should use version cffps2. If version is cffps1, swap the bytes
before output to max_power_out.

Tested:
    Witherspoon before: 3148. Witherspoon after: 3148.
    Rainier before: 53255. Rainier after: 2000.

Signed-off-by: Brandon Wyman <bjwyman@gmail.com>
---
 drivers/hwmon/pmbus/ibm-cffps.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index df712ce4b164..79bfcd2749a6 100644
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -171,8 +171,14 @@ static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
 		cmd = CFFPS_SN_CMD;
 		break;
 	case CFFPS_DEBUGFS_MAX_POWER_OUT:
-		rc = i2c_smbus_read_word_swapped(psu->client,
-						 CFFPS_MAX_POWER_OUT_CMD);
+		if (cffps1 == psu->version) {
+			rc = i2c_smbus_read_word_swapped(psu->client,
+					CFFPS_MAX_POWER_OUT_CMD);
+		} else {
+			rc = i2c_smbus_read_word_data(psu->client,
+					CFFPS_MAX_POWER_OUT_CMD);
+		}
+
 		if (rc < 0)
 			return rc;
 
-- 
2.25.1


             reply	other threads:[~2021-09-28 20:51 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-28 20:50 Brandon Wyman [this message]
2021-09-29 15:38 ` [PATCH v2] hwmon: (pmbus/ibm-cffps) max_power_out swap changes Eddie James
2021-10-02 11:40 ` Guenter Roeck
2021-10-02 11:40   ` Guenter Roeck

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