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vboot_reference: Fix keyboard input lag at confirm screen.

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Changing languages is terribly slow at the confirm screen, when
switching from dev to normal. Reduce sleep time to improve user
experience.

BUG=chrome-os-partner:15726
TEST=boot in dev, hit space, hit arrows rapidly to change language,
observe no lag.
BRANCH=butterfly, stout

Change-Id: I0943debc31d78dcfce87e7f7d4537ae47f5f8cfd
Reviewed-on: https://gerrit.chromium.org/gerrit/36956
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Ready: Shawn Nematbakhsh <shawnn@google.com>
Tested-by: Shawn Nematbakhsh <shawnn@google.com>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2012-10-30 15:17:33 -07:00
committed by Gerrit
parent ca8c372e60
commit ba7fd8dff8
1 changed files with 3 additions and 1 deletions
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4
firmware/lib/vboot_api_kernel.c
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@@ -105,6 +105,8 @@ uint32_t VbTryLoadKernel(VbCommonParams* cparams, LoadKernelParams* p,
return retval; return retval;
} }
#define CONFIRM_KEY_DELAY 20 /* Check confirm screen keys every 20ms */
/* Ask the user to confirm something. We should display whatever the question /* Ask the user to confirm something. We should display whatever the question
* is first, then call this. ESC is always "no", ENTER is always "yes", and * is first, then call this. ESC is always "no", ENTER is always "yes", and
* we'll specify what SPACE means. We don't return until one of those keys is * we'll specify what SPACE means. We don't return until one of those keys is
@@ -139,7 +141,7 @@ static int VbUserConfirms(VbCommonParams* cparams, int space_means_no) {
default: default:
VbCheckDisplayKey(cparams, key, &vnc); VbCheckDisplayKey(cparams, key, &vnc);
} }
VbExSleepMs(1000); VbExSleepMs(CONFIRM_KEY_DELAY);
} }
/* not reached, but compiler will complain without it */ /* not reached, but compiler will complain without it */
return -1; return -1;