Kernel-3.1: save power as long some internal units are not used

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>

3 files changed, 65 insertions, 0 deletions

diff --git a/configs/platform-friendlyarm-mini6410/Changelog b/configs/platform-friendlyarm-mini6410/Changelog
index c27a116..7f69883 100644
--- a/configs/platform-friendlyarm-mini6410/Changelog
+++ b/configs/platform-friendlyarm-mini6410/Changelog
@@ -5,6 +5,7 @@
 
 	* Kernel 3.1:
 		- fix the real 1Wire driver for the Mini6410
+		- save power as long some internal units are not used
 
 2011-11-23	Juergen Beisert <jbe@pengutronix.de>
 
diff --git a/configs/platform-friendlyarm-mini6410/patches/linux-3.1/ARM_S3C64xx_Power_gate_unused_domains.patch b/configs/platform-friendlyarm-mini6410/patches/linux-3.1/ARM_S3C64xx_Power_gate_unused_domains.patch
new file mode 100644
index 0000000..cbcc710
--- /dev/null
+++ b/configs/platform-friendlyarm-mini6410/patches/linux-3.1/ARM_S3C64xx_Power_gate_unused_domains.patch
@@ -0,0 +1,62 @@
+From: Mark Brown <broonie@opensource.wolfsonmicro.com>
+Subject: [PATCH] ARM: S3C64xx: Power gate unused domains
+
+The S3C64xx CPUs have power gating support with a series of software
+controllable power domains in the SoC. To take full advantage of these
+we should implement runtime PM support but since several of the IP blocks
+have no in tree drivers (and at this point aren't likely to acquire such
+drivers) we can get some benefit from the hardware much more easily if
+we just turn those blocks off unconditionally. This will cut down on the
+leakage these domains generate without interfering with active usage.
+
+Do this for:
+ - Domain G: 3D acceleration
+ - Domain V: MFC
+ - Domain I: JPEG and camera interface
+ - Domain P: 2D acceleration, TV encoder and scaler
+
+This is easy to reverse if any of these devices do acquire drivers in the
+future or as part of out of tree patches for them.
+
+Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
+---
+ arch/arm/mach-s3c64xx/pm.c |   15 +++++++++++++++
+ 1 file changed, 15 insertions(+)
+
+Index: linux-3.1/arch/arm/mach-s3c64xx/pm.c
+===================================================================
+--- linux-3.1.orig/arch/arm/mach-s3c64xx/pm.c
++++ linux-3.1/arch/arm/mach-s3c64xx/pm.c
+@@ -85,6 +85,8 @@ static struct sleep_save misc_save[] = {
+ 	SAVE_ITEM(S3C64XX_MEM0CONSLP0),
+ 	SAVE_ITEM(S3C64XX_MEM0CONSLP1),
+ 	SAVE_ITEM(S3C64XX_MEM1CONSLP),
++
++	SAVE_ITEM(S3C64XX_NORMAL_CFG),
+ };
+ 
+ void s3c_pm_configure_extint(void)
+@@ -177,10 +179,23 @@ static void s3c64xx_pm_prepare(void)
+ 
+ static int s3c64xx_pm_init(void)
+ {
++	u32 val;
++
+ 	pm_cpu_prep = s3c64xx_pm_prepare;
+ 	pm_cpu_sleep = s3c64xx_cpu_suspend;
+ 	pm_uart_udivslot = 1;
+ 
++	/*
++	 * Unconditionally disable power domains that contain only
++	 * blocks which have no mainline driver support.
++	 */
++	val = __raw_readl(S3C64XX_NORMAL_CFG);
++	val &= ~(S3C64XX_NORMALCFG_DOMAIN_G_ON |
++		 S3C64XX_NORMALCFG_DOMAIN_V_ON |
++		 S3C64XX_NORMALCFG_DOMAIN_I_ON |
++		 S3C64XX_NORMALCFG_DOMAIN_P_ON);
++	__raw_writel(val, S3C64XX_NORMAL_CFG);
++
+ #ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK
+ 	gpio_request(S3C64XX_GPN(12), "DEBUG_LED0");
+ 	gpio_request(S3C64XX_GPN(13), "DEBUG_LED1");
diff --git a/configs/platform-friendlyarm-mini6410/patches/linux-3.1/series b/configs/platform-friendlyarm-mini6410/patches/linux-3.1/series
index 5256ec5..f00e3d4 100644
--- a/configs/platform-friendlyarm-mini6410/patches/linux-3.1/series
+++ b/configs/platform-friendlyarm-mini6410/patches/linux-3.1/series
@@ -64,4 +64,6 @@ mini6410_ow_backlight.patch
 mini6410_ow_touchscreen.patch
 add_1wire_driver_to_mini6410.diff
 
+ARM_S3C64xx_Power_gate_unused_domains.patch
+
 set-marker.diff