From: Adrian Hunter adrian.hunter@intel.com
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: 7dc9fb47bc9a ("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 --- drivers/ufs/core/ufshcd.c | 3 ++- include/ufs/ufshcd.h | 7 +++++++ 2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index f9adb11067470..acdad8a79cc10 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -4778,7 +4778,8 @@ 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: diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index 0a56374064856..54bcbfe66163e 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -592,6 +592,13 @@ enum ufshcd_quirks { * auto-hibernate capability but it's FASTAUTO only. */ UFSHCD_QUIRK_HIBERN_FASTAUTO = 1 << 18, + + /* + * 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 << 19, };
enum ufshcd_caps {