linux-kernel - [PATCH v2 2/3] usb: chipidea: imx: support disabling runtime-pm

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Message-Id: <20200714151822.250783-2-philippe.schenker@toradex.com>
Date:   Tue, 14 Jul 2020 17:18:21 +0200
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, Peter Chen <Peter.Chen@....com>,
        Shawn Guo <shawnguo@...nel.org>
Cc:     Philippe Schenker <philippe.schenker@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] usb: chipidea: imx: support disabling runtime-pm

The Toradex Colibri iMX6ULL board has a special USB hardware design.
With runtime-pm enabled USB reset itself continuously. Furthermore the
OTG port is also not enumerating devices if the Chipidea IP is in
runtime sleep mode and a device or host gets plugged in.

This patch adds the opportunity to disable Runtime Power Management
from devicetree

Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>

---

Changes in v2:
- Change commit message to tell the use case for Colibri iMX6ULL

 drivers/usb/chipidea/ci_hdrc_imx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 5ae16368a0c7..5078d0695eb7 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -434,6 +434,9 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 		usb_phy_init(pdata.usb_phy);
 	}
 
+	if (of_property_read_bool(np, "disable-runtime-pm"))
+		pdata.flags &= ~CI_HDRC_SUPPORTS_RUNTIME_PM;
+
 	if (pdata.flags & CI_HDRC_SUPPORTS_RUNTIME_PM)
 		data->supports_runtime_pm = true;
 
-- 
2.27.0