linux-kernel - [PATCH v6 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs

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Date:   Wed, 9 Sep 2020 11:35:11 +0200
From:   Amelie Delaunay <amelie.delaunay@...com>
To:     Minas Harutyunyan <hminas@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>
CC:     <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Fabrice Gasnier <fabrice.gasnier@...com>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH v6 3/3] usb: dwc2: don't use ID/Vbus detection if usb-role-switch on STM32MP15 SoCs

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: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
---
 drivers/usb/dwc2/params.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
index a3611cdd1dea..50df72f32b4c 100644
--- a/drivers/usb/dwc2/params.c
+++ b/drivers/usb/dwc2/params.c
@@ -185,7 +185,7 @@ static void dwc2_set_stm32mp15_hsotg_params(struct dwc2_hsotg *hsotg)
 	struct dwc2_core_params *p = &hsotg->params;
 
 	p->otg_cap = DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE;
-	p->activate_stm_id_vb_detection = true;
+	p->activate_stm_id_vb_detection = !device_property_read_bool(hsotg->dev, "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