scsi: ufs: core: Convert string descriptor format macros to enum

Convert SD_ASCII_STD and SD_RAW from boolean macros to enum values for
improved code readability. This makes ufshcd_read_string_desc() calls
self-documenting by using explicit enum values instead of true/false.

Move the ufshcd_read_string_desc() declaration from include/ufs/ufshcd.h
to drivers/ufs/core/ufshcd-priv.h since this function is not exported.

Co-developed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Suggested-by: Avri Altman <Avri.Altman@sandisk.com>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Link: https://patch.msgid.link/20251107230518.4060231-2-beanhuo@iokpp.de
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: beanhuo

drivers/ufs/core/ufshcd-priv.h

@@ -78,11 +78,17 @@ int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag);
 void ufshcd_release_scsi_cmd(struct ufs_hba *hba,
 			     struct ufshcd_lrb *lrbp);
 
-#define SD_ASCII_STD true
-#define SD_RAW false
-int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
-			    u8 **buf, bool ascii);
+/**
+ * enum ufs_descr_fmt - UFS string descriptor format
+ * @SD_RAW: Raw UTF-16 format
+ * @SD_ASCII_STD: Convert to null-terminated ASCII string
+ */
+enum ufs_descr_fmt {
+	SD_RAW = 0,
+	SD_ASCII_STD = 1,
+};
 
+int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index, u8 **buf, enum ufs_descr_fmt fmt);
 int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd);
 int ufshcd_send_bsg_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd);
 

drivers/ufs/core/ufshcd.c

@@ -3773,16 +3773,14 @@ static inline char ufshcd_remove_non_printable(u8 ch)
  * @desc_index: descriptor index
  * @buf: pointer to buffer where descriptor would be read,
  *       the caller should free the memory.
- * @ascii: if true convert from unicode to ascii characters
- *         null terminated string.
+ * @fmt: if %SD_ASCII_STD, convert from UTF-16 to ASCII
  *
  * Return:
  * *      string size on success.
  * *      -ENOMEM: on allocation failure
  * *      -EINVAL: on a wrong parameter
  */
-int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
-			    u8 **buf, bool ascii)
+int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index, u8 **buf, enum ufs_descr_fmt fmt)
 {
 	struct uc_string_id *uc_str;
 	u8 *str;
@@ -3811,7 +3809,7 @@ int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
 		goto out;
 	}
 
-	if (ascii) {
+	if (fmt == SD_ASCII_STD) {
 		ssize_t ascii_len;
 		int i;
 		/* remove header and divide by 2 to move from UTF16 to UTF8 */

include/ufs/ufshcd.h

@@ -1431,10 +1431,6 @@ static inline int ufshcd_disable_host_tx_lcc(struct ufs_hba *hba)
 void ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit);
 void ufshcd_fixup_dev_quirks(struct ufs_hba *hba,
 			     const struct ufs_dev_quirk *fixups);
-#define SD_ASCII_STD true
-#define SD_RAW false
-int ufshcd_read_string_desc(struct ufs_hba *hba, u8 desc_index,
-			    u8 **buf, bool ascii);
 
 void ufshcd_hold(struct ufs_hba *hba);
 void ufshcd_release(struct ufs_hba *hba);