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authorAlexey Starikovskiy <astarikovskiy@suse.de>2008-03-21 10:06:57 -0400
committerLen Brown <len.brown@intel.com>2008-03-24 20:47:35 -0400
commite6e82a3087e6dad619149246082c910623ea9c36 (patch)
tree59a99eb1206c5b478a8154fc0d6712797a797901 /drivers/acpi
parentcc7feea39bed2951cc29af3ad642f39a99dfe8d3 (diff)
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')
-rw-r--r--drivers/acpi/ec.c2
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 {
73 73
74#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ 74#define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
75#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ 75#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
76#define ACPI_EC_UDELAY 100 /* Wait 100us before polling EC again */
76 77
77enum { 78enum {
78 EC_FLAGS_WAIT_GPE = 0, /* Don't check status until GPE arrives */ 79 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)
227 while (time_before(jiffies, delay)) { 228 while (time_before(jiffies, delay)) {
228 if (acpi_ec_check_status(ec, event)) 229 if (acpi_ec_check_status(ec, event))
229 goto end; 230 goto end;
231 udelay(ACPI_EC_UDELAY);
230 } 232 }
231 } 233 }
232 pr_err(PREFIX "acpi_ec_wait timeout," 234 pr_err(PREFIX "acpi_ec_wait timeout,"