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Kernel: Drain I8042 PS/2 keyboard output after enabling

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As soon as we enable the first PS/2 port on the I8042 controller, the
output buffer may become full. We need to drain it before attempting
any new commands with the controller (such as enabling the second PS/2
port).

Fixes #10872.
This commit is contained in:
Jelle Raaijmakers 2021-11-12 00:17:30 +01:00 • committed by Andreas Kling
parent 5e3fe52fc4
commit 86a1ff5204
2 changed files with 7 additions and 6 deletions
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2
Kernel/Devices/HID/I8042Controller.h
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@ -135,7 +135,6 @@ public:
private:
I8042Controller();
void do_drain();
bool do_reset_device(HIDDevice::Type);
u8 do_send_command(HIDDevice::Type type, u8 data);
u8 do_send_command(HIDDevice::Type device, u8 command, u8 data);
@ -143,6 +142,7 @@ private:
u8 do_read_from_device(HIDDevice::Type device);
void do_wait_then_write(u8 port, u8 data);
u8 do_wait_then_read(u8 port);
void drain_output_buffer();
Spinlock m_lock;
bool m_first_port_available { false };