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vboot: Save last screen ID

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This patch makes VbDisplayScreen remember the last successfully displayed
screen and skip rendering if the same screen is requested.

When locale is changed, VbCheckDisplayKey calls VbDisplayScreen with force=1,
which makes VbDisplayScreen render the requested screen regardless of the
saved screen ID.

BUG=chromium:602793
BRANCH=tot
TEST=emerge-veyron_jerry vboot_reference chromeos-bootimage

Change-Id: I31c4dde4ff060081f14224a93d57e9b76fcac1db
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/340264
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
This commit is contained in:
Daisuke Nojiri
2016-04-21 14:54:45 -07:00
committed by chrome-bot
parent 8de46d0af9
commit ff9c2b2e8b
1 changed files with 13 additions and 14 deletions
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27
firmware/lib/vboot_display.c
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@@ -329,16 +329,9 @@ static VbError_t VbDisplayScreenLegacy(VbCommonParams *cparams, uint32_t screen,
return retval;
}
/* If requested screen is the same as the current one, we're done. */
if (disp_current_screen == screen && 0 == force)
return VBERROR_SUCCESS;
/* If the screen is blank, turn off the backlight; else turn it on. */
VbExDisplayBacklight(VB_SCREEN_BLANK == screen ? 0 : 1);
/* Request the screen */
disp_current_screen = screen;
/* Look in the GBB first */
if (VBERROR_SUCCESS == VbDisplayScreenFromGBB(cparams, screen,
vncptr, locale))
@@ -353,20 +346,26 @@ VbError_t VbDisplayScreen(VbCommonParams *cparams, uint32_t screen,
{
uint32_t locale;
GoogleBinaryBlockHeader *gbb = cparams->gbb;
VbError_t rv;
/* If requested screen is the same as the current one, we're done. */
if (disp_current_screen == screen && !force)
return VBERROR_SUCCESS;
/* Read the locale last saved */
VbNvGet(vncptr, VBNV_LOCALIZATION_INDEX, &locale);
if (gbb->bmpfv_size == 0) {
VbError_t ret = VbExDisplayScreen(screen, locale);
if (gbb->bmpfv_size == 0)
rv = VbExDisplayScreen(screen, locale);
else
rv = VbDisplayScreenLegacy(cparams, screen, force, vncptr,
locale);
if (rv == VBERROR_SUCCESS)
/* Keep track of the currently displayed screen */
if (ret == VBERROR_SUCCESS)
disp_current_screen = screen;
return ret;
}
disp_current_screen = screen;
return VbDisplayScreenLegacy(cparams, screen, force, vncptr, locale);
return rv;
}
static void Uint8ToString(char *buf, uint8_t val)