hwmon: (max34451) Work around lost page

When requesting new pages from the max34451 we sometimes see that the
firmware responds with stale or bad data to reads that happen
immediately after a page change. This is due to a lack of clock
stretching after page changing on the device side when it needs more
time to complete the operation.

To remedy this, the manufacturer recommends we wait 50us until
the firmware should be ready with the new page.

Signed-off-by: William A. Kennington III <william@wkennington.com>
Link: https://lore.kernel.org/r/20250408011006.1314622-1-william@wkennington.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: wkennington

drivers/hwmon/pmbus/max34440.c

@@ -12,6 +12,7 @@
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
+#include <linux/delay.h>
 #include "pmbus.h"
 
 enum chips {
@@ -24,6 +25,14 @@ enum chips {
 	max34461,
 };
 
+/*
+ * Firmware is sometimes not ready if we try and read the
+ * data from the page immediately after setting. Maxim
+ * recommends 50us delay due to the chip failing to clock
+ * stretch long enough here.
+ */
+#define MAX34440_PAGE_CHANGE_DELAY 50
+
 #define MAX34440_MFR_VOUT_PEAK		0xd4
 #define MAX34440_MFR_IOUT_PEAK		0xd5
 #define MAX34440_MFR_TEMPERATURE_PEAK	0xd6
@@ -272,6 +281,7 @@ static int max34451_set_supported_funcs(struct i2c_client *client,
 
 	for (page = 0; page < 16; page++) {
 		rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
+		fsleep(MAX34440_PAGE_CHANGE_DELAY);
 		if (rv < 0)
 			return rv;
 
@@ -395,6 +405,7 @@ static struct pmbus_driver_info max34440_info[] = {
 		.read_byte_data = max34440_read_byte_data,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
+		.page_change_delay = MAX34440_PAGE_CHANGE_DELAY,
 	},
 	[max34441] = {
 		.pages = 12,
@@ -438,6 +449,7 @@ static struct pmbus_driver_info max34440_info[] = {
 		.read_byte_data = max34440_read_byte_data,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
+		.page_change_delay = MAX34440_PAGE_CHANGE_DELAY,
 	},
 	[max34446] = {
 		.pages = 7,
@@ -475,6 +487,7 @@ static struct pmbus_driver_info max34440_info[] = {
 		.read_byte_data = max34440_read_byte_data,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
+		.page_change_delay = MAX34440_PAGE_CHANGE_DELAY,
 	},
 	[max34451] = {
 		.pages = 21,
@@ -498,6 +511,7 @@ static struct pmbus_driver_info max34440_info[] = {
 		.func[20] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
+		.page_change_delay = MAX34440_PAGE_CHANGE_DELAY,
 	},
 	[max34460] = {
 		.pages = 18,
@@ -528,6 +542,7 @@ static struct pmbus_driver_info max34440_info[] = {
 		.func[17] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
+		.page_change_delay = MAX34440_PAGE_CHANGE_DELAY,
 	},
 	[max34461] = {
 		.pages = 23,
@@ -563,6 +578,7 @@ static struct pmbus_driver_info max34440_info[] = {
 		.func[21] = PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
 		.read_word_data = max34440_read_word_data,
 		.write_word_data = max34440_write_word_data,
+		.page_change_delay = MAX34440_PAGE_CHANGE_DELAY,
 	},
 };