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| author | Alexey Starikovskiy <astarikovskiy@suse.de> | 2008-03-21 15:06:57 +0100 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2008-03-25 01:47:35 +0100 |
| commit | e6e82a3087e6dad619149246082c910623ea9c36 (patch) | |
| tree | 59a99eb1206c5b478a8154fc0d6712797a797901 /drivers/acpi/ec.c | |
| parent | Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/... (diff) | |
| download | linux-e6e82a3087e6dad619149246082c910623ea9c36.tar.xz linux-e6e82a3087e6dad619149246082c910623ea9c36.zip | |
ACPI: EC: Restore udelay in poll mode
This fixes keyboard event handling on some systems.
Note that this delay was thought unnecessary, and removed
from linux-2.6.20 with 50c1e1138cb94f6aca0f8555777edbcefe0324e2
'ACPI: ec: Drop udelay() from poll mode. Loop by reading status field instead.'
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/ec.c')
| -rw-r--r-- | drivers/acpi/ec.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 7222a18a0319..828c75292cf6 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -73,6 +73,7 @@ enum ec_event { #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ +#define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */ enum { EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ @@ -227,6 +228,7 @@ static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll) while (time_before(jiffies, delay)) { if (acpi_ec_check_status(ec, event)) goto end; + udelay(ACPI_EC_UDELAY); } } pr_err(PREFIX "acpi_ec_wait timeout," |