linux-kernel - [PATCH v6 1/3] phy: Update PHY power control sequence

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Date:   Tue, 29 May 2018 12:37:49 +0800
From:   Can Guo <cang@...eaurora.org>
To:     subhashj@...eaurora.org, asutoshd@...eaurora.org,
        vivek.gautam@...eaurora.org, mgautam@...eaurora.org, kishon@...com,
        robh+dt@...nel.org, mark.rutland@....com
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Can Guo <cang@...eaurora.org>
Subject: [PATCH v6 1/3] phy: Update PHY power control sequence

All PHYs should be powered on before register configuration starts. And
only PCIe PHYs need an extra power control before deasserts reset state.

Signed-off-by: Can Guo <cang@...eaurora.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 97ef942..f779b0f 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -982,6 +982,8 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp)
 	if (cfg->has_phy_com_ctrl)
 		qphy_setbits(serdes, cfg->regs[QPHY_COM_POWER_DOWN_CONTROL],
 			     SW_PWRDN);
+	else
+		qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
 
 	if (cfg->has_phy_dp_com_ctrl) {
 		qphy_setbits(dp_com, QPHY_V3_DP_COM_POWER_DOWN_CTRL,
@@ -1127,7 +1129,8 @@ static int qcom_qmp_phy_init(struct phy *phy)
 	 * Pull out PHY from POWER DOWN state.
 	 * This is active low enable signal to power-down PHY.
 	 */
-	qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
+	if (cfg->type == PHY_TYPE_PCIE)
+		qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL, cfg->pwrdn_ctrl);
 
 	if (cfg->has_pwrdn_delay)
 		usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_max);
-- 
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