diff options
| author | Colin Ian King <colin.king@canonical.com> | 2011-05-23 15:06:50 +0100 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2012-06-25 15:02:13 -0600 |
| commit | 10271f6295c9ac25595e08710fcc404fc2336774 (patch) | |
| tree | ba5c8c8eac819c7d5cc0360a21b2c36cb6c856f6 | |
| parent | 20493ca2ab973902cdbbe231a367cd1b4522c5e0 (diff) | |
UBUNTU: SAUCE: S3 early resume debug via keyboard LEDs
Add support to debug S3 early resume by flashing the keyboard
LEDs three times in the realmode path. This is useful to allow
one to determine if S3 hangs occur in the BIOS or during the early
resume phase.
Add kernel parameter acpi_sleep=s3_leds to enable the s3 debugging
option. This can also be enabled by writing 8 to
/proc/sys/kernel/acpi_video_flags.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 5 | ||||
| -rw-r--r-- | arch/x86/kernel/acpi/sleep.c | 2 | ||||
| -rw-r--r-- | arch/x86/realmode/rm/wakemain.c | 27 |
3 files changed, 33 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index a92c5ebf373..d79efa33735 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -252,12 +252,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted. For broken nForce2 BIOS resulting in XT-PIC timer. acpi_sleep= [HW,ACPI] Sleep options - Format: { s3_bios, s3_mode, s3_beep, s4_nohwsig, + Format: { s3_bios, s3_mode, s3_beep, s3_leds, s4_nohwsig, old_ordering, nonvs, sci_force_enable } See Documentation/power/video.txt for information on s3_bios and s3_mode. s3_beep is for debugging; it makes the PC's speaker beep as soon as the kernel's real-mode entry point is called. + s3_leds is for debugging; it flashes the keyboard LEDs + 3 times as soon as the kernel's real-mode entry point is + called. s4_nohwsig prevents ACPI hardware signature from being used during resume from hibernation. old_ordering causes the ACPI 1.0 ordering of the _PTS diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c index 95bf99de905..79357aae9f1 100644 --- a/arch/x86/kernel/acpi/sleep.c +++ b/arch/x86/kernel/acpi/sleep.c @@ -94,6 +94,8 @@ static int __init acpi_sleep_setup(char *str) acpi_realmode_flags |= 2; if (strncmp(str, "s3_beep", 7) == 0) acpi_realmode_flags |= 4; + if (strncmp(str, "s3_leds", 7) == 0) + acpi_realmode_flags |= 8; #ifdef CONFIG_HIBERNATION if (strncmp(str, "s4_nohwsig", 10) == 0) acpi_no_s4_hw_signature(); diff --git a/arch/x86/realmode/rm/wakemain.c b/arch/x86/realmode/rm/wakemain.c index 91405d515ec..810b9c13c7a 100644 --- a/arch/x86/realmode/rm/wakemain.c +++ b/arch/x86/realmode/rm/wakemain.c @@ -61,6 +61,30 @@ static void send_morse(const char *pattern) } } +#define I8042_STATUS_REG 0x64 +#define I8042_DATA_REG 0x60 +#define I8042_SET_LED_BITS 0xed +#define I8042_STR_IBF 0x02 + +static void flash_keyboard_leds(void) +{ + int i; + unsigned char leds = 7; + + /* Flash keyboard LEDs 3 times */ + for (i = 0; i < 6; i++) { + while (inb(I8042_STATUS_REG) & I8042_STR_IBF) + ; + outb(I8042_SET_LED_BITS, I8042_DATA_REG); + while (inb(I8042_STATUS_REG) & I8042_STR_IBF) + ; + outb(leds, I8042_DATA_REG); + leds ^= 7; + udelay(500000); + } +} + + void main(void) { /* Kill machine if structures are wrong */ @@ -79,4 +103,7 @@ void main(void) probe_cards(0); set_mode(wakeup_header.video_mode); } + + if (wakeup_header.realmode_flags & 8) + flash_keyboard_leds(); } |