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>

1 files changed, 29 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;
+}