Merge tag 'hwmon-for-v6.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - Fix sporadic comunication errors in pmbus/bel-pfe and
   aquacomputer_d5next drivers

* tag 'hwmon-for-v6.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (aquacomputer_d5next) Add selective 200ms delay after sending ctrl report
  hwmon: (pmbus/bel-pfe) Enable PMBUS_SKIP_STATUS_CHECK for pfe1100

2 files changed, 44 insertions, 9 deletions

diff --git a/drivers/hwmon/aquacomputer_d5next.c b/drivers/hwmon/aquacomputer_d5next.c
index a997dbcb563f..023807859be7 100644
--- a/drivers/hwmon/aquacomputer_d5next.c
+++ b/drivers/hwmon/aquacomputer_d5next.c
@@ -13,9 +13,11 @@
 
 #include <linux/crc16.h>
 #include <linux/debugfs.h>
+#include <linux/delay.h>
 #include <linux/hid.h>
 #include <linux/hwmon.h>
 #include <linux/jiffies.h>
+#include <linux/ktime.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/seq_file.h>
@@ -63,6 +65,8 @@ static const char *const aqc_device_names[] = {
 #define CTRL_REPORT_ID			0x03
 #define AQUAERO_CTRL_REPORT_ID		0x0b
 
+#define CTRL_REPORT_DELAY		200	/* ms */
+
 /* The HID report that the official software always sends
  * after writing values, currently same for all devices
  */
@@ -527,6 +531,9 @@ struct aqc_data {
 	int secondary_ctrl_report_size;
 	u8 *secondary_ctrl_report;
 
+	ktime_t last_ctrl_report_op;
+	int ctrl_report_delay;	/* Delay between two ctrl report operations, in ms */
+
 	int buffer_size;
 	u8 *buffer;
 	int checksum_start;
@@ -611,17 +618,35 @@ static int aqc_aquastreamxt_convert_fan_rpm(u16 val)
 	return 0;
 }
 
+static void aqc_delay_ctrl_report(struct aqc_data *priv)
+{
+	/*
+	 * If previous read or write is too close to this one, delay the current operation
+	 * to give the device enough time to process the previous one.
+	 */
+	if (priv->ctrl_report_delay) {
+		s64 delta = ktime_ms_delta(ktime_get(), priv->last_ctrl_report_op);
+
+		if (delta < priv->ctrl_report_delay)
+			msleep(priv->ctrl_report_delay - delta);
+	}
+}
+
 /* Expects the mutex to be locked */
 static int aqc_get_ctrl_data(struct aqc_data *priv)
 {
 	int ret;
 
+	aqc_delay_ctrl_report(priv);
+
 	memset(priv->buffer, 0x00, priv->buffer_size);
 	ret = hid_hw_raw_request(priv->hdev, priv->ctrl_report_id, priv->buffer, priv->buffer_size,
 				 HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
 	if (ret < 0)
 		ret = -ENODATA;
 
+	priv->last_ctrl_report_op = ktime_get();
+
 	return ret;
 }
 
@@ -631,6 +656,8 @@ static int aqc_send_ctrl_data(struct aqc_data *priv)
 	int ret;
 	u16 checksum;
 
+	aqc_delay_ctrl_report(priv);
+
 	/* Checksum is not needed for Aquaero */
 	if (priv->kind != aquaero) {
 		/* Init and xorout value for CRC-16/USB is 0xffff */
@@ -646,12 +673,16 @@ static int aqc_send_ctrl_data(struct aqc_data *priv)
 	ret = hid_hw_raw_request(priv->hdev, priv->ctrl_report_id, priv->buffer, priv->buffer_size,
 				 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
 	if (ret < 0)
-		return ret;
+		goto record_access_and_ret;
 
 	/* The official software sends this report after every change, so do it here as well */
 	ret = hid_hw_raw_request(priv->hdev, priv->secondary_ctrl_report_id,
 				 priv->secondary_ctrl_report, priv->secondary_ctrl_report_size,
 				 HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
+
+record_access_and_ret:
+	priv->last_ctrl_report_op = ktime_get();
+
 	return ret;
 }
 
@@ -1524,6 +1555,7 @@ static int aqc_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
 		priv->buffer_size = AQUAERO_CTRL_REPORT_SIZE;
 		priv->temp_ctrl_offset = AQUAERO_TEMP_CTRL_OFFSET;
+		priv->ctrl_report_delay = CTRL_REPORT_DELAY;
 
 		priv->temp_label = label_temp_sensors;
 		priv->virtual_temp_label = label_virtual_temp_sensors;
@@ -1547,6 +1579,7 @@ static int aqc_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		priv->temp_ctrl_offset = D5NEXT_TEMP_CTRL_OFFSET;
 
 		priv->buffer_size = D5NEXT_CTRL_REPORT_SIZE;
+		priv->ctrl_report_delay = CTRL_REPORT_DELAY;
 
 		priv->power_cycle_count_offset = D5NEXT_POWER_CYCLES;
 
@@ -1597,6 +1630,7 @@ static int aqc_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		priv->temp_ctrl_offset = OCTO_TEMP_CTRL_OFFSET;
 
 		priv->buffer_size = OCTO_CTRL_REPORT_SIZE;
+		priv->ctrl_report_delay = CTRL_REPORT_DELAY;
 
 		priv->power_cycle_count_offset = OCTO_POWER_CYCLES;
 
@@ -1624,6 +1658,7 @@ static int aqc_probe(struct hid_device *hdev, const struct hid_device_id *id)
 		priv->temp_ctrl_offset = QUADRO_TEMP_CTRL_OFFSET;
 
 		priv->buffer_size = QUADRO_CTRL_REPORT_SIZE;
+		priv->ctrl_report_delay = CTRL_REPORT_DELAY;
 
 		priv->flow_pulses_ctrl_offset = QUADRO_FLOW_PULSES_CTRL_OFFSET;
 		priv->power_cycle_count_offset = QUADRO_POWER_CYCLES;
diff --git a/drivers/hwmon/pmbus/bel-pfe.c b/drivers/hwmon/pmbus/bel-pfe.c
index fa5070ae26bc..7c5f4b10a7c1 100644
--- a/drivers/hwmon/pmbus/bel-pfe.c
+++ b/drivers/hwmon/pmbus/bel-pfe.c
@@ -17,12 +17,13 @@
 enum chips {pfe1100, pfe3000};
 
 /*
- * Disable status check for pfe3000 devices, because some devices report
- * communication error (invalid command) for VOUT_MODE command (0x20)
- * although correct VOUT_MODE (0x16) is returned: it leads to incorrect
- * exponent in linear mode.
+ * Disable status check because some devices report communication error
+ * (invalid command) for VOUT_MODE command (0x20) although the correct
+ * VOUT_MODE (0x16) is returned: it leads to incorrect exponent in linear
+ * mode.
+ * This affects both pfe3000 and pfe1100.
  */
-static struct pmbus_platform_data pfe3000_plat_data = {
+static struct pmbus_platform_data pfe_plat_data = {
 	.flags = PMBUS_SKIP_STATUS_CHECK,
 };
 
@@ -94,16 +95,15 @@ static int pfe_pmbus_probe(struct i2c_client *client)
 	int model;
 
 	model = (int)i2c_match_id(pfe_device_id, client)->driver_data;
+	client->dev.platform_data = &pfe_plat_data;
 
 	/*
 	 * PFE3000-12-069RA devices may not stay in page 0 during device
 	 * probe which leads to probe failure (read status word failed).
 	 * So let's set the device to page 0 at the beginning.
 	 */
-	if (model == pfe3000) {
-		client->dev.platform_data = &pfe3000_plat_data;
+	if (model == pfe3000)
 		i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
-	}
 
 	return pmbus_do_probe(client, &pfe_driver_info[model]);
 }