linux-kernel - [PATCH] x86: fix the delay when controlling brightness using hotkeys on ideapad laptops

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Message-ID: <1362439987.98158.YahooMailNeo@web171602.mail.ir2.yahoo.com>
Date:	Mon, 4 Mar 2013 23:33:07 +0000 (GMT)
From:	Hamed Abdelli <abdelli.hamed@...oo.fr>
To:	"dwmw2@...radead.org" <dwmw2@...radead.org>
Cc:	"trivial@...nel.org" <trivial@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: fix the delay when controlling brightness using hotkeys on ideapad laptops

Fixes the lag when reading and writing hotkeys for backlight control on ideapad laptops by minimizing the timeout.

Applies to linux-3.8.2

Thanks,

Signed-off-by: Hamed ABDELLI <abdelli.hamed@...oo.fr>

--- linux-3.8.2/drivers/platform/x86/ideapad-laptop.c.orig      2013-03-04 23:38:09.291989270 +0100
+++ linux-3.8.2/drivers/platform/x86/ideapad-laptop.c   2013-03-04 23:38:47.272988333 +0100
@@ -90,7 +90,7 @@ MODULE_PARM_DESC(no_bt_rfkill, "No rfkil
 /*
  * ACPI Helpers
  */
-#define IDEAPAD_EC_TIMEOUT (100) /* in ms */
+#define IDEAPAD_EC_TIMEOUT (1) /* in ms */

 static int read_method_int(acpi_handle handle, const char *method, int *val)
 {
@@ -157,7 +157,7 @@ static int read_ec_data(acpi_handle hand
        if (method_vpcw(handle, 1, cmd))
                return -1;

-       for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
+       for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/10000+1;
             time_before(jiffies, end_jiffies);) {
                schedule();
                if (method_vpcr(handle, 1, &val))
@@ -183,7 +183,7 @@ static int write_ec_cmd(acpi_handle hand
        if (method_vpcw(handle, 1, cmd))
                return -1;

-       for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
+       for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/10000+1;
             time_before(jiffies, end_jiffies);) {
                schedule();
                if (method_vpcr(handle, 1, &val))
--
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