From: Alexey Starikovskiy <astarikovskiy@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
---
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 7222a18..828c752 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,"
--
1.5.5.1.99.gf0ec4
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