[PATCH v1 1/7] ufs: decode string descriptors as UTF-16 big-endian

[Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>]

UFS string descriptors are UTF-16 big-endian (JESD220), but
ufshcd_read_string_desc() fed the raw bytes to utf16_to_utf8(), which reads
host-endian code units, leaving dev_desc->model blank. Byte-swap to host
order before decoding, matching the kernel.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>
---
 drivers/ufs/ufs-uclass.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/ufs/ufs-uclass.c b/drivers/ufs/ufs-uclass.c
index 6a51f337e47..4d10e0b11fe 100644
--- a/drivers/ufs/ufs-uclass.c
+++ b/drivers/ufs/ufs-uclass.c
@@ -1765,6 +1765,14 @@ static int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index,
 			goto out;
 		}
 
+		{
+			u16 *ustr = (u16 *)&buf[QUERY_DESC_HDR_SIZE];
+			int num_chars = (desc_len - QUERY_DESC_HDR_SIZE) / 2;
+
+			for (i = 0; i < num_chars; i++)
+				ustr[i] = be16_to_cpu(ustr[i]);
+		}
+
 		/*
 		 * the descriptor contains string in UTF16 format
 		 * we need to convert to utf-8 so it can be displayed
-- 
2.54.0