From 3f369032013bf3fc63bf5e78b3bd9bd850851de1 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sat, 5 Sep 2020 00:32:52 +0200
Subject: [PATCH] Kernel/USB: Start the UHCI controller after resetting it

---
 Kernel/Devices/UHCIController.cpp | 12 ++++++++++++
 Kernel/Devices/UHCIController.h   |  1 +
 2 files changed, 13 insertions(+)

diff --git a/Kernel/Devices/UHCIController.cpp b/Kernel/Devices/UHCIController.cpp
index d53e6342b2..f58cfa0bc5 100644
--- a/Kernel/Devices/UHCIController.cpp
+++ b/Kernel/Devices/UHCIController.cpp
@@ -65,6 +65,7 @@ UHCIController::UHCIController(PCI::Address address, PCI::ID id)
     klog() << "UHCI: Interrupt line: " << PCI::get_interrupt_line(pci_address());
 
     reset();
+    start();
 }
 
 UHCIController::~UHCIController()
@@ -97,6 +98,17 @@ void UHCIController::stop()
     }
 }
 
+void UHCIController::start()
+{
+    write_usbcmd(read_usbcmd() | UHCI_USBCMD_RUN);
+    // FIXME: Timeout
+    for (;;) {
+        if (!(read_usbsts() & UHCI_USBSTS_HOST_CONTROLLER_HALTED))
+            break;
+    }
+    klog() << "UHCI: Started!";
+}
+
 void UHCIController::handle_irq(const RegisterState&)
 {
 }
diff --git a/Kernel/Devices/UHCIController.h b/Kernel/Devices/UHCIController.h
index ed71595f03..a839b3b40c 100644
--- a/Kernel/Devices/UHCIController.h
+++ b/Kernel/Devices/UHCIController.h
@@ -38,6 +38,7 @@ public:
 
     void reset();
     void stop();
+    void start();
 
 private:
     UHCIController(PCI::Address, PCI::ID);