scsi: ufs: core: Add advanced RPMB support where UFSHCI 4.0 does not …

…support EHS length in UTRD

According to UFSHCI 4.0 specification:

5.2 Host Controller Capabilities Registers
5.2.1 Offset 00h: CAP – Controller Capabilities:

 "EHS Length in UTRD Supported (EHSLUTRDS): Indicates whether the host
  controller supports EHS Length field in UTRD.

  0 – Host controller takes EHS length from CMD UPIU, and SW driver use EHS
  Length field in CMD UPIU.

  1 – HW controller takes EHS length from UTRD, and SW driver use EHS
  Length field in UTRD.

  NOTE Recommend Host controllers move to taking EHS length from UTRD, and
  in UFS-5, it will be mandatory."

So, when UFSHCI 4.0 doesn't support EHS Length field in UTRD, we could use
EHS Length field in CMD UPIU. Remove the limitation that advanced RPMB only
works when EHS length is supported in UTRD.

Fixes: 6ff265f ("scsi: ufs: core: bsg: Add advanced RPMB support in ufs_bsg")
Co-developed-by: "jonghwi.rha" <jonghwi.rha@samsung.com>
Signed-off-by: "jonghwi.rha" <jonghwi.rha@samsung.com>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Link: https://lore.kernel.org/r/20230809181847.102123-2-beanhuo@iokpp.de
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/ufs/core/ufs_bsg.c

@@ -76,8 +76,7 @@ static int ufs_bsg_exec_advanced_rpmb_req(struct ufs_hba *hba, struct bsg_job *j
 	int ret;
 	int data_len;
 
-	if (hba->ufs_version < ufshci_version(4, 0) || !hba->dev_info.b_advanced_rpmb_en ||
-	    !(hba->capabilities & MASK_EHSLUTRD_SUPPORTED))
+	if (hba->ufs_version < ufshci_version(4, 0) || !hba->dev_info.b_advanced_rpmb_en)
 		return -EINVAL;
 
 	if (rpmb_request->ehs_req.length != 2 || rpmb_request->ehs_req.ehs_type != 1)

drivers/ufs/core/ufshcd.c

@@ -7240,7 +7240,15 @@ int ufshcd_advanced_rpmb_req_handler(struct ufs_hba *hba, struct utp_upiu_req *r
 	/* Advanced RPMB starts from UFS 4.0, so its command type is UTP_CMD_TYPE_UFS_STORAGE */
 	lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;
 
-	ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, dir, 2);
+	/*
+	 * According to UFSHCI 4.0 specification page 24, if EHSLUTRDS is 0, host controller takes
+	 * EHS length from CMD UPIU, and SW driver use EHS Length field in CMD UPIU. if it is 1,
+	 * HW controller takes EHS length from UTRD.
+	 */
+	if (hba->capabilities & MASK_EHSLUTRD_SUPPORTED)
+		ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, dir, 2);
+	else
+		ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, dir, 0);
 
 	/* update the task tag and LUN in the request upiu */
 	req_upiu->header.flags = upiu_flags;