[PATCH 1/2] scsi: ufs: core: Add a quirk for extended TX EQTR Adapt L0L1L2L3 length

[Can Guo <can.guo@oss.qualcomm.com>]

Add a quirk to support TX Equalization Training (EQTR) using Adapt L0L1L2L3
length which is larger than what is allowed by M-PHY spec ver 6.0.

Signed-off-by: Can Guo <can.guo@oss.qualcomm.com>
---
 drivers/ufs/core/ufs-txeq.c | 8 ++++++--
 include/ufs/ufshcd.h        | 7 +++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/core/ufs-txeq.c b/drivers/ufs/core/ufs-txeq.c
index b2dc89124353..fe647450a7a1 100644
--- a/drivers/ufs/core/ufs-txeq.c
+++ b/drivers/ufs/core/ufs-txeq.c
@@ -740,7 +740,9 @@ static int ufshcd_setup_tx_eqtr_adapt_length(struct ufs_hba *hba,
 		if (adapt_l0l1l2l3_cap_local > ADAPT_L0L1L2L3_LENGTH_MAX) {
 			dev_err(hba->dev, "local RX_HS_G%u_ADAPT_INITIAL_L0L1L2L3_CAP (0x%x) exceeds MAX\n",
 				gear, adapt_l0l1l2l3_cap_local);
-			return -EINVAL;
+
+			if (!(hba->quirks & UFSHCD_QUIRK_EXTENDED_TX_EQTR_ADAPT_LENGTH_L0L1L2L3))
+				return -EINVAL;
 		}
 
 		ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_PEERRXHSG6ADAPTINITIALL0L1L2L3),
@@ -751,7 +753,9 @@ static int ufshcd_setup_tx_eqtr_adapt_length(struct ufs_hba *hba,
 		if (adapt_l0l1l2l3_cap_peer > ADAPT_L0L1L2L3_LENGTH_MAX) {
 			dev_err(hba->dev, "peer RX_HS_G%u_ADAPT_INITIAL_L0L1L2L3_CAP (0x%x) exceeds MAX\n",
 				gear, adapt_l0l1l2l3_cap_peer);
-			return -EINVAL;
+
+			if (!(hba->quirks & UFSHCD_QUIRK_EXTENDED_TX_EQTR_ADAPT_LENGTH_L0L1L2L3))
+				return -EINVAL;
 		}
 
 		t_adapt_l0l1l2l3_local = adapt_cap_to_t_adapt_l0l1l2l3(adapt_l0l1l2l3_cap_local);
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index cfbc75d8df83..7a7c07636cf7 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -804,6 +804,13 @@ enum ufshcd_quirks {
 	 * delay after enabling VCC to ensure it's stable.
 	 */
 	UFSHCD_QUIRK_VCC_ON_DELAY			= 1 << 27,
+
+	/*
+	 * This quirk indicates that Host supports TX Equalization Training
+	 * (EQTR) using Adapt L0L1L2L3 length which is larger than what is
+	 * allowed by M-PHY spec ver 6.0.
+	 */
+	UFSHCD_QUIRK_EXTENDED_TX_EQTR_ADAPT_LENGTH_L0L1L2L3	= 1 << 28,
 };
 
 enum ufshcd_caps {
-- 
2.34.1