FAILED: patch "[PATCH] iio: hid-sensor-rotation: Fix quaternion data not correct" failed to apply to 5.4-stable tree

[<gregkh@xxxxxxxxxxxxxxxxxxx>]

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 6c3b615379d7cd90d2f70b3cf9860c5a4910546a Mon Sep 17 00:00:00 2001
From: Ye Xiang <xiang.ye@xxxxxxxxx>
Date: Sat, 30 Jan 2021 18:25:46 +0800
Subject: [PATCH] iio: hid-sensor-rotation: Fix quaternion data not correct

Because the data of HID_USAGE_SENSOR_ORIENT_QUATERNION defined by ISH FW
is s16, but quaternion data type is in_rot_quaternion_type(le:s16/32X4>>0),
need to transform data type from s16 to s32

May require manual backporting.

Fixes: fc18dddc0625 ("iio: hid-sensors: Added device rotation support")
Signed-off-by: Ye Xiang <xiang.ye@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210130102546.31397-1-xiang.ye@xxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

diff --git a/drivers/iio/orientation/hid-sensor-rotation.c b/drivers/iio/orientation/hid-sensor-rotation.c
index 18e4ef060096..c087d8f72a54 100644
--- a/drivers/iio/orientation/hid-sensor-rotation.c
+++ b/drivers/iio/orientation/hid-sensor-rotation.c
@@ -21,7 +21,7 @@ struct dev_rot_state {
 	struct hid_sensor_common common_attributes;
 	struct hid_sensor_hub_attribute_info quaternion;
 	struct {
-		u32 sampled_vals[4] __aligned(16);
+		s32 sampled_vals[4] __aligned(16);
 		u64 timestamp __aligned(8);
 	} scan;
 	int scale_pre_decml;
@@ -170,8 +170,15 @@ static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev,
 	struct dev_rot_state *rot_state = iio_priv(indio_dev);
 
 	if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
-		memcpy(&rot_state->scan.sampled_vals, raw_data,
-		       sizeof(rot_state->scan.sampled_vals));
+		if (raw_len / 4 == sizeof(s16)) {
+			rot_state->scan.sampled_vals[0] = ((s16 *)raw_data)[0];
+			rot_state->scan.sampled_vals[1] = ((s16 *)raw_data)[1];
+			rot_state->scan.sampled_vals[2] = ((s16 *)raw_data)[2];
+			rot_state->scan.sampled_vals[3] = ((s16 *)raw_data)[3];
+		} else {
+			memcpy(&rot_state->scan.sampled_vals, raw_data,
+			       sizeof(rot_state->scan.sampled_vals));
+		}
 
 		dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
 			sizeof(rot_state->scan.sampled_vals));