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scsi: ufs: core: Add a quirk for handling broken LSDBS field in controller capabilities register

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[ Upstream commit cd06b713a6880997ca5aecac8e33d5f9c541749e ]

'Legacy Queue & Single Doorbell Support (LSDBS)' field in the controller
capabilities register is supposed to report whether the legacy single
doorbell mode is supported in the controller or not. But some controllers
report '1' in this field which corresponds to 'LSDB not supported', but
they indeed support LSDB. So let's add a quirk to handle those controllers.

If the quirk is enabled by the controller driver, then LSDBS register field
will be ignored and legacy single doorbell mode is assumed to be enabled
always.

Tested-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20240816-ufs-bug-fix-v3-1-e6fe0e18e2a3@linaro.org
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Stable-dep-of: d968e99488c4 ("scsi: ufs: ufs-pci: Set UFSHCD_QUIRK_PERFORM_LINK_STARTUP_ONCE for Intel ADL")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Manivannan Sadhasivam
2025-11-09 19:47:48 -05:00
committed by Greg Kroah-Hartman
parent d1f293ee8d
commit 753ca4b5be
2 changed files with 13 additions and 1 deletions
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6
drivers/ufs/core/ufshcd.c
View File

@@ -2368,7 +2368,11 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
* 0h: legacy single doorbell support is available
* 1h: indicate that legacy single doorbell support has been removed
*/
hba->lsdb_sup = !FIELD_GET(MASK_LSDB_SUPPORT, hba->capabilities);
if (!(hba->quirks & UFSHCD_QUIRK_BROKEN_LSDBS_CAP))
hba->lsdb_sup = !FIELD_GET(MASK_LSDB_SUPPORT, hba->capabilities);
else
hba->lsdb_sup = true;
if (!hba->mcq_sup)
return 0;

8
include/ufs/ufshcd.h
View File

@@ -670,6 +670,14 @@ enum ufshcd_quirks {
* the standard best practice for managing keys).
*/
UFSHCD_QUIRK_KEYS_IN_PRDT = 1 << 24,
/*
* This quirk indicates that the controller reports the value 1 (not
* supported) in the Legacy Single DoorBell Support (LSDBS) bit of the
* Controller Capabilities register although it supports the legacy
* single doorbell mode.
*/
UFSHCD_QUIRK_BROKEN_LSDBS_CAP = 1 << 25,
};
enum ufshcd_caps {