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authorKevin Hilman <khilman@deeprootsystems.com>2010-12-22 07:31:55 +0300
committerPaul Walmsley <paul@pwsan.com>2010-12-22 07:31:55 +0300
commit7f595674e08b8b4d3faf64a19bccc95445d7ed35 (patch)
treebbd97c930eb170b877a5d6c35e9bc9ec206a9559
parent0a01aa211da8530dc6a3ff3a725f2edd3464c46f (diff)
downloadlinux-7f595674e08b8b4d3faf64a19bccc95445d7ed35.tar.xz
OMAP2+: powerdomain: add API to get context loss count
Add new powerdomain API u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm) for checking how many times the powerdomain has lost context. The loss count is the sum of the powerdomain off-mode counter, the logic off counter and the per-bank memory off counter. Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com> [paul@pwsan.com: removed bogus return value on error; improved kerneldoc; tweaked commit message] Signed-off-by: Paul Walmsley <paul@pwsan.com>
-rw-r--r--arch/arm/mach-omap2/powerdomain.c29
-rw-r--r--arch/arm/mach-omap2/powerdomain.h1
2 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 06ef60eebebd..eaed0df16699 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -909,3 +909,32 @@ int pwrdm_post_transition(void)
pwrdm_for_each(_pwrdm_post_transition_cb, NULL);
return 0;
}
+
+/**
+ * pwrdm_get_context_loss_count - get powerdomain's context loss count
+ * @pwrdm: struct powerdomain * to wait for
+ *
+ * Context loss count is the sum of powerdomain off-mode counter, the
+ * logic off counter and the per-bank memory off counter. Returns 0
+ * (and WARNs) upon error, otherwise, returns the context loss count.
+ */
+u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm)
+{
+ int i, count;
+
+ if (!pwrdm) {
+ WARN(1, "powerdomain: %s: pwrdm is null\n", __func__);
+ return 0;
+ }
+
+ count = pwrdm->state_counter[PWRDM_POWER_OFF];
+ count += pwrdm->ret_logic_off_counter;
+
+ for (i = 0; i < pwrdm->banks; i++)
+ count += pwrdm->ret_mem_off_counter[i];
+
+ pr_debug("powerdomain: %s: context loss count = %u\n",
+ pwrdm->name, count);
+
+ return count;
+}
diff --git a/arch/arm/mach-omap2/powerdomain.h b/arch/arm/mach-omap2/powerdomain.h
index 35b5b4800a43..c66431edfeb7 100644
--- a/arch/arm/mach-omap2/powerdomain.h
+++ b/arch/arm/mach-omap2/powerdomain.h
@@ -211,6 +211,7 @@ int pwrdm_clkdm_state_switch(struct clockdomain *clkdm);
int pwrdm_pre_transition(void);
int pwrdm_post_transition(void);
int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm);
+u32 pwrdm_get_context_loss_count(struct powerdomain *pwrdm);
extern void omap2xxx_powerdomains_init(void);
extern void omap3xxx_powerdomains_init(void);