scsi: ufs: core: Add a quirk to suppress link_startup_again

ufshcd_link_startup() has a facility (link_startup_again) to issue
DME_LINKSTARTUP a 2nd time even though the 1st time was successful.

Some older hardware benefits from that, however the behaviour is
non-standard, and has been found to cause link startup to be unreliable
for some Intel Alder Lake based host controllers.

Add UFSHCD_QUIRK_PERFORM_LINK_STARTUP_ONCE to suppress
link_startup_again, in preparation for setting the quirk for affected
controllers.

Fixes: 7dc9fb4 ("scsi: ufs: ufs-pci: Add support for Intel ADL")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20251024085918.31825-3-adrian.hunter@intel.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: ahunter6

drivers/ufs/core/ufshcd.c

@@ -5066,7 +5066,8 @@ static int ufshcd_link_startup(struct ufs_hba *hba)
 	 * If UFS device isn't active then we will have to issue link startup
 	 * 2 times to make sure the device state move to active.
 	 */
-	if (!ufshcd_is_ufs_dev_active(hba))
+	if (!(hba->quirks & UFSHCD_QUIRK_PERFORM_LINK_STARTUP_ONCE) &&
+	    !ufshcd_is_ufs_dev_active(hba))
 		link_startup_again = true;
 
 link_startup:

include/ufs/ufshcd.h

@@ -688,6 +688,13 @@ enum ufshcd_quirks {
 	 * single doorbell mode.
 	 */
 	UFSHCD_QUIRK_BROKEN_LSDBS_CAP			= 1 << 25,
+
+	/*
+	 * This quirk indicates that DME_LINKSTARTUP should not be issued a 2nd
+	 * time (refer link_startup_again) after the 1st time was successful,
+	 * because it causes link startup to become unreliable.
+	 */
+	UFSHCD_QUIRK_PERFORM_LINK_STARTUP_ONCE		= 1 << 26,
 };
 
 enum ufshcd_caps {