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-rw-r--r--drivers/scsi/ufs/ufs_quirks.h14
-rw-r--r--drivers/scsi/ufs/ufshcd.c10
2 files changed, 23 insertions, 1 deletions
diff --git a/drivers/scsi/ufs/ufs_quirks.h b/drivers/scsi/ufs/ufs_quirks.h
index 62ebd89fd787..ee4ab85e2801 100644
--- a/drivers/scsi/ufs/ufs_quirks.h
+++ b/drivers/scsi/ufs/ufs_quirks.h
@@ -18,7 +18,7 @@
/* return true if s1 is a prefix of s2 */
#define STR_PRFX_EQUAL(s1, s2) !strncmp(s1, s2, strlen(s1))
-#define UFS_ANY_VENDOR -1
+#define UFS_ANY_VENDOR 0xFFFF
#define UFS_ANY_MODEL "ANY_MODEL"
#define MAX_MODEL_LEN 16
@@ -119,16 +119,28 @@ struct ufs_dev_fix {
*/
#define UFS_DEVICE_NO_FASTAUTO (1 << 5)
+/*
+ * It seems some UFS devices may keep drawing more than sleep current
+ * (atleast for 500us) from UFS rails (especially from VCCQ rail).
+ * To avoid this situation, add 2ms delay before putting these UFS
+ * rails in LPM mode.
+ */
+#define UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM (1 << 6)
+
struct ufs_hba;
void ufs_advertise_fixup_device(struct ufs_hba *hba);
static struct ufs_dev_fix ufs_fixups[] = {
/* UFS cards deviations table */
+ UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
+ UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM),
UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL, UFS_DEVICE_NO_VCCQ),
UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS),
UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
UFS_DEVICE_NO_FASTAUTO),
+ UFS_FIX(UFS_VENDOR_TOSHIBA, UFS_ANY_MODEL,
+ UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM),
UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9C8KBADG",
UFS_DEVICE_QUIRK_PA_TACTIVATE),
UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9D8KBADG",
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 93cc02f2d48e..f8fa72c31a9d 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5716,6 +5716,16 @@ out:
static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
{
/*
+ * It seems some UFS devices may keep drawing more than sleep current
+ * (atleast for 500us) from UFS rails (especially from VCCQ rail).
+ * To avoid this situation, add 2ms delay before putting these UFS
+ * rails in LPM mode.
+ */
+ if (!ufshcd_is_link_active(hba) &&
+ hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM)
+ usleep_range(2000, 2100);
+
+ /*
* If UFS device is either in UFS_Sleep turn off VCC rail to save some
* power.
*