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Commit f2e6c2d4 authored by Mayank Rana's avatar Mayank Rana
Browse files

usb: phy: qmp: Add support to enable/disable USB QMP PHY clocks 



Currently few USB QMP PHY clocks are enable always on USB cable
disconnect and entering into USB low power mode. Due to this
XO/VDD Min shutdown is not happening. This change adds support
to enable/disable USB QMP PHY clocks based on USB cable status
before going into USB low power mode.

Change-Id: Ibad5759178f98d94ffcc84b9b1f647f478a980c6
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
parent ce80330c

drivers/usb/phy/phy-msm-ssusb-qmp.c

+39 −1
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ struct msm_ssphy_qmp { 
	struct clk		*phy_com_reset;

	struct clk		*phy_reset;

	bool			clk_enabled;

	bool			suspend_allowed;

};



static int msm_ssusb_qmp_config_vdd(struct msm_ssphy_qmp *phy, int high)
@@ -389,23 +390,60 @@ static int msm_ssphy_qmp_set_params(struct usb_phy *uphy) 
	return 0;

}



/**

 * Performs QMP PHY suspend/resume functionality.

 *

 * @uphy - usb phy pointer.

 * @suspend - to enable suspend or not. 1 - suspend, 0 - resume

 *

 */

static int msm_ssphy_qmp_set_suspend(struct usb_phy *uphy, int suspend)

{

	dev_dbg(uphy->dev, "%s\n", __func__);

	struct msm_ssphy_qmp *phy = container_of(uphy, struct msm_ssphy_qmp,

					phy);



	dev_dbg(uphy->dev, "%s: suspend state: current :%d new:%d\n",

				__func__, phy->suspend_allowed, suspend);



	if (!!suspend == phy->suspend_allowed) {

		pr_debug("%s(): USB PHY is already suspended.\n", __func__);

		return 0;

	}



	if (suspend) {

		clk_disable_unprepare(phy->pipe_clk);

		clk_disable_unprepare(phy->cfg_ahb_clk);

		clk_disable_unprepare(phy->aux_clk);

		phy->suspend_allowed = true;

	} else {

		clk_prepare_enable(phy->aux_clk);

		clk_prepare_enable(phy->cfg_ahb_clk);

		clk_prepare_enable(phy->pipe_clk);

		phy->suspend_allowed = false;

	}



	return 0;

}



static int msm_ssphy_qmp_notify_connect(struct usb_phy *uphy,

				       enum usb_device_speed speed)

{

	struct msm_ssphy_qmp *phy = container_of(uphy, struct msm_ssphy_qmp,

					phy);



	dev_dbg(uphy->dev, "%s\n", __func__);

	phy->suspend_allowed = true;

	return 0;

}



static int msm_ssphy_qmp_notify_disconnect(struct usb_phy *uphy,

				       enum usb_device_speed speed)

{

	struct msm_ssphy_qmp *phy = container_of(uphy, struct msm_ssphy_qmp,

					phy);



	dev_dbg(uphy->dev, "%s\n", __func__);

	phy->suspend_allowed = false;

	return 0;

}