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spring: Pull more current from video dongle

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We cannot know how much current we can pull from video dongle, so let's
just try to pull as much as possible up to 2A.

BUG=chrome-os-partner:19324
TEST=Plug in video dongle and see 3.3V output.
TEST=Plug in video dongle with supplied charger, and see 50% PWM duty
cycle.
TEST=Plug in video dongle with normal charger, and see 70~80% PWM duty
cycle.
BRANCH=spring

Change-Id: I8b503f886fcafaa11e6757a5059ce673a8ed53cc
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50963
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Vic Yang
2013-05-13 10:55:28 +08:00
committed by ChromeBot
parent c18ef5f421
commit cbebc28804
1 changed files with 10 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
common/extpower_usb.c
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@@ -257,12 +257,12 @@ static int apple_charger_current(void)
return apple_charger_type[type];
}
static int dcp_current_limit(void)
static int hard_current_limit(int limit)
{
if (current_limit_mode == LIMIT_AGGRESSIVE)
return I_LIMIT_1500MA - PWM_CTRL_OC_MARGIN;
return limit - PWM_CTRL_OC_MARGIN;
else
return I_LIMIT_1500MA;
return limit;
}
static int probe_video(int device_type)
@@ -488,7 +488,9 @@ static void usb_update_ilim(int dev_type)
else if (dev_type & TSU6721_TYPE_CDP)
current_limit = I_LIMIT_1500MA;
else if (dev_type & TSU6721_TYPE_DCP)
current_limit = dcp_current_limit();
current_limit = hard_current_limit(I_LIMIT_1500MA);
else if (dev_type & TSU6721_TYPE_JIG_UART_ON)
current_limit = hard_current_limit(I_LIMIT_2000MA);
pwm_nominal_duty_cycle(current_limit);
} else {
@@ -687,10 +689,12 @@ static void power_tweak(void)
/* Check video power input change */
if (current_dev_type & TSU6721_TYPE_JIG_UART_ON) {
if (get_video_power() && vbus > 4000)
if (get_video_power() && vbus > 4000) {
set_video_power(0);
else if (!get_video_power() && vbus <= 4000)
} else if (!get_video_power() && vbus <= 4000) {
set_pwm_duty_cycle(100);
set_video_power(1);
}
}
if (battery_current(&current))