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Revert "libpayload: Reset PS/2 keyboard" 

Documentation is scarce on the matter, however the related coreboot
code suggests that after the ACK, the keyboard also sends the result
of the self test (passed/failed). It looks like this result is never
consumed here, probably resulting in further confusion for later com-
mands.

Let's revert this for now (if it's not too late for the 4.10 release)
and break things later again. IMHO, due to the fact that there are
dozens of different keyboard controller and keyboard implementations
and no accurate specification followed, such changes should be tested
on a lot of hardware before merge.

This reverts commit a99ed13e33.
This reverts commit 7ae606f57f.

Change-Id: I4d4304d5d8a01e013feac61016c59bcaeea81140
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33244
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Martin Kepplinger <martink@posteo.de>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Nico Huber 2019-06-06 11:00:36 +02:00
parent 1f12772d19
commit 21bfc9f99b
2 changed files with 5 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
payloads/libpayload/drivers/i8042/i8042.h
View File

@ -63,7 +63,6 @@
#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

25
payloads/libpayload/drivers/i8042/keyboard.c
View File

@ -172,7 +172,7 @@ static unsigned char keyboard_cmd(unsigned char cmd)
{
i8042_write_data(cmd);
return i8042_wait_read_ps2() == I8042_KBCMD_ACK;
return i8042_wait_read_ps2() == 0xfa;
}
int keyboard_havechar(void)
@ -317,42 +317,27 @@ 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) {
printf("ERROR: Keyboard reset failed!\n");
return;
}
/* Set scancode set 1 */
ret = keyboard_cmd(I8042_KBCMD_SET_SCANCODE);
if (!ret && !CONFIG(LP_PC_KEYBOARD_IGNORE_INIT_FAILURE)) {
printf("ERROR: Keyboard set scancode failed!\n");
if (!ret && !CONFIG(LP_PC_KEYBOARD_IGNORE_INIT_FAILURE))
return;
}
ret = keyboard_cmd(I8042_SCANCODE_SET_1);
if (!ret && !CONFIG(LP_PC_KEYBOARD_IGNORE_INIT_FAILURE)) {
printf("ERROR: Keyboard scancode set#1 failed!\n");
if (!ret && !CONFIG(LP_PC_KEYBOARD_IGNORE_INIT_FAILURE))
return;
}
/*
* Set default parameters.
* Fix for broken QEMU ps/2 make scancodes.
*/
ret = keyboard_cmd(0xf6);
if (!ret) {
printf("ERROR: Keyboard set default params failed!\n");
if (!ret)
return;
}
/* Enable scanning */
ret = keyboard_cmd(I8042_KBCMD_EN);
if (!ret && !CONFIG(LP_PC_KEYBOARD_IGNORE_INIT_FAILURE)) {
printf("ERROR: Keyboard enable scanning failed!\n");
if (!ret && !CONFIG(LP_PC_KEYBOARD_IGNORE_INIT_FAILURE))
return;
}
console_add_input_driver(&cons);
}