linux-kernel - [PATCH 3/4] phy: qcom-qmp: Add optional SW reset

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Date:   Thu, 19 Dec 2019 20:34:32 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Andy Gross <agross@...nel.org>,
        Can Guo <cang@...eaurora.org>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] phy: qcom-qmp: Add optional SW reset

For V4 QMP UFS Phy, we need to assert reset bits, configure the phy and
then deassert it, so add optional has_sw_reset flag and use that to
configure the QPHY_SW_RESET register.

Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 06f971ca518e..80304b7cd895 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -1023,6 +1023,9 @@ struct qmp_phy_cfg {
 
 	/* true, if PCS block has no separate SW_RESET register */
 	bool no_pcs_sw_reset;
+
+	/* true if sw reset needs to be invoked */
+	bool has_sw_reset;
 };
 
 /**
@@ -1391,6 +1394,7 @@ static const struct qmp_phy_cfg sm8150_ufsphy_cfg = {
 
 	.is_dual_lane_phy	= true,
 	.no_pcs_sw_reset	= true,
+	.has_sw_reset		= true,
 };
 
 static void qcom_qmp_phy_configure(void __iomem *base,
@@ -1475,6 +1479,9 @@ static int qcom_qmp_phy_com_init(struct qmp_phy *qphy)
 			     SW_USB3PHY_RESET_MUX | SW_USB3PHY_RESET);
 	}
 
+	if (cfg->has_sw_reset)
+		qphy_setbits(serdes, cfg->regs[QPHY_SW_RESET], SW_RESET);
+
 	if (cfg->has_phy_com_ctrl)
 		qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
 			     SW_PWRDN);
@@ -1651,6 +1658,9 @@ static int qcom_qmp_phy_enable(struct phy *phy)
 	if (cfg->has_phy_dp_com_ctrl)
 		qphy_clrbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
 
+	if (cfg->has_sw_reset)
+		qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
+
 	/* start SerDes and Phy-Coding-Sublayer */
 	qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
 
-- 
2.23.0