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kevin: Save and restore display backlight PWM duty across sysjump

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Display backlight going down for an extended period of time is
a major user annoyance, so save the duty prior to sysjump and restore it
upon init.

BUG=chrome-os-partner:56390
BRANCH=None
TEST=On kevin, run "sysjump rw" from recovery screen, verify backlight
goes black for a fraction of a second and comes back to previous level.

Change-Id: I98f12ace9b933874ba9088a790b9efa0941050ed
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/373621
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2016-08-20 14:25:59 -07:00
committed by chrome-bot
parent 9a59b5ea9c
commit 383ee4260b
1 changed files with 25 additions and 0 deletions
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25
board/kevin/board.c
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@@ -36,6 +36,7 @@
#include "shi_chip.h"
#include "spi.h"
#include "switch.h"
#include "system.h"
#include "task.h"
#include "tcpm.h"
#include "timer.h"
@@ -614,3 +615,27 @@ static void usb_charge_shutdown(void)
}
DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, usb_charge_shutdown, HOOK_PRIO_DEFAULT);
#endif
#define PWM_DISPLIGHT_SYSJUMP_TAG 0x5044 /* "PD" */
#define PWM_HOOK_VERSION 1
static void pwm_displight_restore_state(void)
{
const int *prev;
int version, size;
prev = (const int *)system_get_jump_tag(PWM_DISPLIGHT_SYSJUMP_TAG,
&version, &size);
if (prev && version == PWM_HOOK_VERSION && size == sizeof(*prev))
pwm_set_duty(PWM_CH_DISPLIGHT, *prev);
}
DECLARE_HOOK(HOOK_INIT, pwm_displight_restore_state, HOOK_PRIO_INIT_PWM + 1);
static void pwm_displight_preserve_state(void)
{
int pwm_displight_duty = pwm_get_duty(PWM_CH_DISPLIGHT);
system_add_jump_tag(PWM_DISPLIGHT_SYSJUMP_TAG, PWM_HOOK_VERSION,
sizeof(pwm_displight_duty), &pwm_displight_duty);
}
DECLARE_HOOK(HOOK_SYSJUMP, pwm_displight_preserve_state, HOOK_PRIO_DEFAULT);