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chromeec: Add google_chromeec_wait_for_display 

The google_chromeec_wait_for_display API checks whether a display is
ready or not. It waits in a loop until EC says it entered DisplayPort
alternative mode or times out in 2 seconds.

BUG=b:72387533
BRANCH=none
TEST=See 23746 "mb/google/fizz: Wait until display is ready"

Change-Id: Ieee5db77bd6e147936ea8fc735dcbeffec98c0f8
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://review.coreboot.org/23745
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Daisuke Nojiri 2018-01-26 17:36:44 -08:00 committed by Aaron Durbin
parent 476c2c5808
commit ebb86be9fc
2 changed files with 25 additions and 0 deletions
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24
src/ec/google/chromeec/ec.c
View File

@ -29,6 +29,7 @@
#include <rtc.h>
#include <stdlib.h>
#include <security/vboot/vboot_common.h>
#include <timer.h>
#include "chip.h"
#include "ec.h"
@ -984,3 +985,26 @@ int google_chromeec_pd_get_amode(uint16_t svid)
return 0;
}
const static long wait_for_display_timeout_ms = 2000;
#define USB_SID_DISPLAYPORT 0xff01
void google_chromeec_wait_for_display(void)
{
struct stopwatch sw;
printk(BIOS_INFO, "Waiting for display\n");
stopwatch_init_msecs_expire(&sw, wait_for_display_timeout_ms);
while (google_chromeec_pd_get_amode(USB_SID_DISPLAYPORT) != 1) {
if (stopwatch_expired(&sw)) {
printk(BIOS_WARNING,
"Display not ready after %ldms. Abort.\n",
wait_for_display_timeout_ms);
return;
}
mdelay(200);
}
printk(BIOS_INFO, "Display ready after %lu ms\n",
stopwatch_duration_msecs(&sw));
}

1
src/ec/google/chromeec/ec.h
View File

@ -37,6 +37,7 @@ bool google_chromeec_is_uhepi_supported(void);
int google_ec_running_ro(void);
void google_chromeec_init(void);
int google_chromeec_pd_get_amode(uint16_t svid);
void google_chromeec_wait_for_display(void);
/* Device events */
uint64_t google_chromeec_get_device_enabled_events(void);