summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--drivers/acpi/ec.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 2fe15060dcdc..ac9dd3b386b1 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -67,7 +67,7 @@ enum ec_command {
#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 */
+#define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */
#define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts
per one transaction */
@@ -236,13 +236,23 @@ static int ec_check_sci(struct acpi_ec *ec, u8 state)
return 0;
}
+static void ec_delay(void)
+{
+ /* EC in MSI notebooks don't tolerate delays other than 550 usec */
+ if (EC_FLAGS_MSI)
+ udelay(ACPI_EC_DELAY);
+ else
+ /* Use shortest sleep available */
+ msleep(1);
+}
+
static int ec_poll(struct acpi_ec *ec)
{
unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
- udelay(ACPI_EC_UDELAY);
+ udelay(ACPI_EC_CDELAY);
while (time_before(jiffies, delay)) {
gpe_transaction(ec, acpi_ec_read_status(ec));
- udelay(ACPI_EC_UDELAY);
+ ec_delay();
if (ec_transaction_done(ec))
return 0;
}