OMAP4 powerdomain: Support LOWPOWERSTATECHANGE for powerdomains
Some powerdomains in OMAP4 support a direct transition from one sleep
state to another deeper sleep state without having to wakeup the
powerdomain. This patch adds an api in the powerdomain framework to
set the LOWPOWERSTATECHANGE bit in PWRSTCTRL register.
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 4a91d38d..f9f0bca 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -980,6 +980,34 @@
}
/**
+ * pwrdm_set_lowpwrstchange - Request a low power state change
+ * @pwrdm: struct powerdomain *
+ *
+ * Allows a powerdomain to transtion to a lower power sleep state
+ * from an existing sleep state without waking up the powerdomain.
+ * Returns -EINVAL if the powerdomain pointer is null or if the
+ * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0
+ * upon success.
+ */
+int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE))
+ return -EINVAL;
+
+ pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n",
+ pwrdm->name);
+
+ prm_rmw_mod_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
+ (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
+ pwrdm->prcm_offs, pwrstctrl_reg_offs);
+
+ return 0;
+}
+
+/**
* pwrdm_wait_transition - wait for powerdomain power transition to finish
* @pwrdm: struct powerdomain * to wait for
*
diff --git a/arch/arm/mach-omap2/powerdomains44xx.h b/arch/arm/mach-omap2/powerdomains44xx.h
index ad5a265..c721951 100644
--- a/arch/arm/mach-omap2/powerdomains44xx.h
+++ b/arch/arm/mach-omap2/powerdomains44xx.h
@@ -54,6 +54,7 @@
[3] = PWRDM_POWER_ON, /* ducati_l2ram */
[4] = PWRDM_POWER_ON, /* ducati_unicache */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* gfx_44xx_pwrdm: 3D accelerator power domain */
@@ -69,6 +70,7 @@
.pwrsts_mem_on = {
[0] = PWRDM_POWER_ON, /* gfx_mem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* abe_44xx_pwrdm: Audio back end power domain */
@@ -87,6 +89,7 @@
[0] = PWRDM_POWER_ON, /* aessmem */
[1] = PWRDM_POWER_ON, /* periphmem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* dss_44xx_pwrdm: Display subsystem power domain */
@@ -103,6 +106,7 @@
.pwrsts_mem_on = {
[0] = PWRDM_POWER_ON, /* dss_mem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* tesla_44xx_pwrdm: Tesla processor power domain */
@@ -123,6 +127,7 @@
[1] = PWRDM_POWER_ON, /* tesla_l1 */
[2] = PWRDM_POWER_ON, /* tesla_l2 */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* wkup_44xx_pwrdm: Wake-up power domain */
@@ -227,6 +232,7 @@
[2] = PWRDM_POWER_ON, /* tcm1_mem */
[3] = PWRDM_POWER_ON, /* tcm2_mem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* cam_44xx_pwrdm: Camera subsystem power domain */
@@ -242,6 +248,7 @@
.pwrsts_mem_on = {
[0] = PWRDM_POWER_ON, /* cam_mem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* l3init_44xx_pwrdm: L3 initators pheripherals power domain */
@@ -258,6 +265,7 @@
.pwrsts_mem_on = {
[0] = PWRDM_POWER_ON, /* l3init_bank1 */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* l4per_44xx_pwrdm: Target peripherals power domain */
@@ -276,6 +284,7 @@
[0] = PWRDM_POWER_ON, /* nonretained_bank */
[1] = PWRDM_POWER_ON, /* retained_bank */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/*
diff --git a/arch/arm/plat-omap/include/plat/powerdomain.h b/arch/arm/plat-omap/include/plat/powerdomain.h
index e7cc7e6..fb6ec74 100644
--- a/arch/arm/plat-omap/include/plat/powerdomain.h
+++ b/arch/arm/plat-omap/include/plat/powerdomain.h
@@ -50,6 +50,12 @@
* in MEM bank 1 position. This is
* true for OMAP3430
*/
+#define PWRDM_HAS_LOWPOWERSTATECHANGE (1 << 2) /*
+ * support to transition from a
+ * sleep state to a lower sleep
+ * state without waking up the
+ * powerdomain
+ */
/*
* Number of memory banks that are power-controllable. On OMAP4430, the