From 7ae606f57f0b3d450ae748141b0e2367041b27d3 Mon Sep 17 00:00:00 2001 From: Paul Menzel Date: Wed, 22 May 2019 19:19:15 +0200 Subject: [PATCH] libpayload: Reset PS/2 keyboard MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Loading a libpayload based payload like coreinfo or FILO from SeaBIOS or GRUB pressing keys does not give the expected results. For example, pressing F1 gives the character 24 translated to scan code 6a. ESC for example 43 (111) in coreinfo loaded from SeaBIOS on QEMU Q35. The problem is not reproducible using the payload directly, that means without SeaBIOS or GRUB. The problem seems to be, that those have already initialized the PS/2 controller and AT keyboard. Comparing it with coreboot’s PS/2 keyboard code, the keyboard needs to be reset. That seems to fix the issue, when the keyboard was initialized before. TEST=Build coreboot for QEMU Q35 with SeaBIOS, and coreinfo as secondary payload. Run qemu-system-i386 -M q35 -L /dev/shm -bios build/coreboot.rom -serial stdio press 3 to select the coreinfo payload, and verify that the keys F1 and F2 are working. Same with coreinfo loaded from GRUB on the ASRock E350M1. Change-Id: I2732292ac316d4bc0029ecb5c95fa7d1e7d68947 Signed-off-by: Paul Menzel Reviewed-on: https://review.coreboot.org/c/coreboot/+/32951 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi --- payloads/libpayload/drivers/i8042/i8042.h | 1 + payloads/libpayload/drivers/i8042/keyboard.c | 7 +++++++ 2 files changed, 8 insertions(+) diff --git a/payloads/libpayload/drivers/i8042/i8042.h b/payloads/libpayload/drivers/i8042/i8042.h index 643167ef40..e864ac9263 100644 --- a/payloads/libpayload/drivers/i8042/i8042.h +++ b/payloads/libpayload/drivers/i8042/i8042.h @@ -63,6 +63,7 @@ #define I8042_KBCMD_EN 0xf4 #define I8042_KBCMD_DEFAULT_DIS 0xf5 #define I8042_KBCMD_SET_DEFAULT 0xf6 +#define I8042_KBCMD_ACK 0xfa #define I8042_KBCMD_RESEND 0xfe #define I8042_KBCMD_RESET 0xff diff --git a/payloads/libpayload/drivers/i8042/keyboard.c b/payloads/libpayload/drivers/i8042/keyboard.c index cded638380..fea9e718dd 100644 --- a/payloads/libpayload/drivers/i8042/keyboard.c +++ b/payloads/libpayload/drivers/i8042/keyboard.c @@ -317,6 +317,13 @@ void keyboard_init(void) /* Enable first PS/2 port */ i8042_cmd(I8042_CMD_EN_KB); + /* Reset keyboard and self test (keyboard side) */ + ret = keyboard_cmd(I8042_KBCMD_RESET); + if (ret != I8042_KBCMD_ACK) { + printf("ERROR: Keyboard reset failed ACK: 0x%x\n", ret); + return; + } + /* Set scancode set 1 */ ret = keyboard_cmd(I8042_KBCMD_SET_SCANCODE); if (!ret && !CONFIG(LP_PC_KEYBOARD_IGNORE_INIT_FAILURE))