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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: f.fainelli@gmail.com, gregkh@linuxfoundation.org,
	wahrenst@gmx.net, robh@kernel.org, mathias.nyman@linux.intel.com,
	Eric Anholt <eric@anholt.net>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
	linux-pci@vger.kernel.org, linux-usb@vger.kernel.org,
	Mathias Nyman <mathias.nyman@intel.com>,
	Philipp Zabel <p.zabel@pengutronix.de>
Cc: linux-kernel@vger.kernel.org, tim.gover@raspberrypi.org,
	helgaas@kernel.org, lorenzo.pieralisi@arm.com,
	Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH 5/9] usb: xhci-pci: Add support for reset controllers
Date: Mon,  8 Jun 2020 21:26:57 +0200	[thread overview]
Message-ID: <20200608192701.18355-6-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20200608192701.18355-1-nsaenzjulienne@suse.de>

Some atypical users of xhci-pci might need to manually reset their xHCI
controller before starting the HCD setup. Check if a reset controller
device is available to the PCI bus and trigger a reset.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/usb/host/xhci-pci.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index ef513c2fb843..45f70facdfcd 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -12,6 +12,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/acpi.h>
+#include <linux/reset.h>
 
 #include "xhci.h"
 #include "xhci-trace.h"
@@ -339,6 +340,7 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	struct xhci_hcd *xhci;
 	struct usb_hcd *hcd;
 	struct xhci_driver_data *driver_data;
+	struct reset_control *reset;
 
 	driver_data = (struct xhci_driver_data *)id->driver_data;
 	if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
@@ -347,6 +349,13 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 			return retval;
 	}
 
+	reset = devm_reset_control_get(&dev->bus->dev, NULL);
+	if (IS_ERR(reset)) {
+		retval = PTR_ERR(reset);
+		return retval;
+	}
+	reset_control_reset(reset);
+
 	/* Prevent runtime suspending between USB-2 and USB-3 initialization */
 	pm_runtime_get_noresume(&dev->dev);
 
-- 
2.26.2


  parent reply	other threads:[~2020-06-08 19:28 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-08 19:26 [PATCH 0/9] Raspberry Pi 4 USB firmware initialization rework Nicolas Saenz Julienne
2020-06-08 19:26 ` [PATCH 1/9] dt-bindings: reset: Add a binding for the RPi Firmware USB reset Nicolas Saenz Julienne
2020-06-08 19:58   ` Florian Fainelli
2020-06-09 11:14     ` Nicolas Saenz Julienne
2020-06-08 19:26 ` [PATCH 2/9] reset: Add Raspberry Pi 4 firmware USB reset controller Nicolas Saenz Julienne
2020-06-08 20:13   ` Florian Fainelli
2020-06-08 19:26 ` [PATCH 3/9] ARM: dts: bcm2711: Add firmware usb reset node Nicolas Saenz Julienne
2020-06-08 19:26 ` [PATCH 4/9] ARM: dts: bcm2711: Add reset controller to xHCI node Nicolas Saenz Julienne
2020-06-08 19:26 ` Nicolas Saenz Julienne [this message]
2020-06-08 19:43   ` [PATCH 5/9] usb: xhci-pci: Add support for reset controllers Florian Fainelli
2020-06-09 11:18     ` Nicolas Saenz Julienne
2020-06-09 11:59       ` Philipp Zabel
2020-06-09 13:08         ` Nicolas Saenz Julienne
     [not found]   ` <CAHp75VdWq96SSzB1S9pM=H8=3np8-1Cep_9BqGiTCUTtCUt-yw@mail.gmail.com>
2020-06-09 11:19     ` Nicolas Saenz Julienne
2020-06-08 19:26 ` [PATCH 6/9] Revert "USB: pci-quirks: Add Raspberry Pi 4 quirk" Nicolas Saenz Julienne
2020-06-08 19:26 ` [PATCH 7/9] usb: host: pci-quirks: Bypass xHCI quirks for Raspberry Pi 4 Nicolas Saenz Julienne
2020-06-08 19:50   ` Florian Fainelli
2020-06-08 19:27 ` [PATCH 8/9] Revert "firmware: raspberrypi: Introduce vl805 init routine" Nicolas Saenz Julienne
2020-06-08 19:27 ` [PATCH 9/9] Revert "PCI: brcmstb: Wait for Raspberry Pi's firmware when present" Nicolas Saenz Julienne

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