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From:   Amelie Delaunay <amelie.delaunay@st.com>
To:     Minas Harutyunyan <hminas@synopsys.com>,
        Felipe Balbi <balbi@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Alexandre Torgue <alexandre.torgue@st.com>
CC:     <linux-usb@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        Fabrice Gasnier <fabrice.gasnier@st.com>,
        Amelie Delaunay <amelie.delaunay@st.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Subject: [PATCH v4 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs
Date:   Mon, 27 Jul 2020 11:23:46 +0200
Message-ID: <20200727092346.19780-4-amelie.delaunay@st.com>
In-Reply-To: <20200727092346.19780-1-amelie.delaunay@st.com>
References: <20200727092346.19780-1-amelie.delaunay@st.com>
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If usb-role-switch is present in the device tree, it means that ID and Vbus
signals are not connected to the OTG controller but to an external
component (GPIOs, Type-C controller). In this configuration, usb role
switch is used to force valid sessions on STM32MP15 SoCs.

Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
---
No changes in v4.
---
 drivers/usb/dwc2/params.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index a3611cdd1dea..65f8596f6795 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -183,9 +183,11 @@ static void dwc2_set_stm32mp15_fsotg_params(struct dwc2_hsotg *hsotg)
 static void dwc2_set_stm32mp15_hsotg_params(struct dwc2_hsotg *hsotg)
 {
 	struct dwc2_core_params *p = &hsotg->params;
+	struct device_node *np = hsotg->dev->of_node;
 
 	p->otg_cap = DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE;
-	p->activate_stm_id_vb_detection = true;
+	p->activate_stm_id_vb_detection =
+		!of_property_read_bool(np, "usb-role-switch");
 	p->host_rx_fifo_size = 440;
 	p->host_nperio_tx_fifo_size = 256;
 	p->host_perio_tx_fifo_size = 256;
-- 
2.17.1