ACPI: ec: Drop udelay() from poll mode. Loop by reading status field instead.

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 2 insertions, 5 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 722acafdf32e..8ef74e7b3b91 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -70,8 +70,6 @@ enum {
 
 #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      /* Poll @ 100us increments */
-#define ACPI_EC_UDELAY_COUNT   1000     /* Wait 100ms max. during EC ops */
 
 enum {
         EC_INTR = 1,    /* Output buffer full */
@@ -159,11 +157,10 @@ static int acpi_ec_check_status(struct acpi_ec *ec, u8 event)
 static int acpi_ec_wait(struct acpi_ec *ec, u8 event)
 {
         if (acpi_ec_mode == EC_POLL) {
-                int i;
-                for (i = 0; i < ACPI_EC_UDELAY_COUNT; ++i) {
+                unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
+                while (time_before(jiffies, delay)) {
                         if (acpi_ec_check_status(ec, event))
                                 return 0;
-                        udelay(ACPI_EC_UDELAY);
                 }
         } else {
                 if (wait_event_timeout(ec->wait,