linux-kernel - [PATCH 2/2] usb: chipidea: imx: Fix ULPI on imx53

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Message-Id: <20180124171439.10721-2-sebastian.reichel@collabora.co.uk>
Date:   Wed, 24 Jan 2018 18:14:39 +0100
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Peter Chen <Peter.Chen@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ian Ray <ian.ray@...com>, Nandor Han <nandor.han@...com>,
        Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>,
        kernel@...ts.collabora.co.uk,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Subject: [PATCH 2/2] usb: chipidea: imx: Fix ULPI on imx53

Traditionally, PORTSC should be set before initializing ULPI phys. But
setting PORTSC before powering on the phy results in a kernel freeze
on imx53 based GE PPD. As a workaround this initializes the phy early
in the imx platform code and disables phy power management from the
core.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
---
 drivers/usb/chipidea/ci_hdrc_imx.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index de155c80eb70..e431c5aafe35 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -83,6 +83,7 @@ struct ci_hdrc_imx_data {
 	struct clk *clk;
 	struct imx_usbmisc_data *usbmisc_data;
 	bool supports_runtime_pm;
+	bool override_phy_control;
 	bool in_lpm;
 	/* SoC before i.mx6 (except imx23/imx28) needs three clks */
 	bool need_three_clks;
@@ -254,6 +255,7 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 	int ret;
 	const struct of_device_id *of_id;
 	const struct ci_hdrc_imx_platform_flag *imx_platform_flag;
+	struct device_node *np = pdev->dev.of_node;
 
 	of_id = of_match_device(ci_hdrc_imx_dt_ids, &pdev->dev);
 	if (!of_id)
@@ -288,6 +290,14 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 	}
 
 	pdata.usb_phy = data->phy;
+
+	if (of_device_is_compatible(np, "fsl,imx53-usb") && pdata.usb_phy &&
+	    of_usb_get_phy_mode(np) == USBPHY_INTERFACE_MODE_ULPI) {
+		pdata.flags |= CI_HDRC_OVERRIDE_PHY_CONTROL;
+		data->override_phy_control = true;
+		usb_phy_init(pdata.usb_phy);
+	}
+
 	pdata.flags |= imx_platform_flag->flags;
 	if (pdata.flags & CI_HDRC_SUPPORTS_RUNTIME_PM)
 		data->supports_runtime_pm = true;
@@ -341,6 +351,8 @@ static int ci_hdrc_imx_remove(struct platform_device *pdev)
 		pm_runtime_put_noidle(&pdev->dev);
 	}
 	ci_hdrc_remove_device(data->ci_pdev);
+	if (data->override_phy_control)
+		usb_phy_shutdown(data->phy);
 	imx_disable_unprepare_clks(&pdev->dev);
 
 	return 0;
-- 
2.15.1