Add pm_runtime support to dmtimer. Since dmtimer is used during
early boot before pm_runtime is initialized completely there are
provisions to enable/disable clocks directly in the code during
early boot.
Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@xxxxxx>
[p-basak2@xxxxxx: added pm_runtime logic in probe()]
Signed-off-by: Partha Basak <p-basak2@xxxxxx>
Reviewed-by: Varadarajan, Charulatha <charu@xxxxxx>
Acked-by: Cousson, Benoit <b-cousson@xxxxxx>
---
arch/arm/plat-omap/dmtimer.c | 63 ++++++++++++++++++++++++++++++++++++------
1 files changed, 54 insertions(+), 9 deletions(-)
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 53f5205..fcac422 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -39,6 +39,7 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <plat/dmtimer.h>
@@ -211,13 +212,16 @@ static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
{
struct dmtimer_platform_data *pdata = timer->pdev->dev.platform_data;
- timer->fclk = clk_get(&timer->pdev->dev, "fck");
- if (WARN_ON_ONCE(IS_ERR_OR_NULL(timer->fclk))) {
- dev_err(&timer->pdev->dev, ": No fclk handle.\n");
- return;
+ if (!pdata->is_omap16xx) {
+ timer->fclk = clk_get(&timer->pdev->dev, "fck");
+ if (WARN_ON_ONCE(IS_ERR_OR_NULL(timer->fclk))) {
+ dev_err(&timer->pdev->dev, ": No fclk handle.\n");
+ return;
+ }
}
- omap_dm_timer_enable(timer);
+ if (!pdata->is_omap16xx)
+ omap_dm_timer_enable(timer);
if (pdata->dm_timer_reset)
pdata->dm_timer_reset(timer);
@@ -292,10 +296,22 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_free);
void omap_dm_timer_enable(struct omap_dm_timer *timer)
{
+ struct dmtimer_platform_data *pdata = timer->pdev->dev.platform_data;
+
if (timer->enabled)
return;
- clk_enable(timer->fclk);
+ if (unlikely(pdata->is_early_init)) {
+ clk_enable(timer->fclk);
+ timer->enabled = 1;
+ return;
+ }
+
+ if (pm_runtime_get_sync(&timer->pdev->dev) < 0) {
+ dev_err(&timer->pdev->dev, "%s: pm_runtime_get_sync() FAILED\n",
+ __func__);
+ return;
+ }
timer->enabled = 1;
}
@@ -303,10 +319,22 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_enable);
void omap_dm_timer_disable(struct omap_dm_timer *timer)
{
+ struct dmtimer_platform_data *pdata = timer->pdev->dev.platform_data;
+
if (!timer->enabled)
return;
- clk_disable(timer->fclk);
+ if (unlikely(pdata->is_early_init)) {
+ clk_disable(timer->fclk);
+ timer->enabled = 0;
+ return;
+ }
+
+ if (pm_runtime_put_sync(&timer->pdev->dev) < 0) {
+ dev_err(&timer->pdev->dev, "%s: pm_runtime_put_sync() FAILED\n",
+ __func__);
+ return;
+ }
timer->enabled = 0;
}
@@ -425,10 +453,12 @@ int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
if (source < 0 || source >= 3)
return -EINVAL;
- omap_dm_timer_disable(timer);
+ if (!pdata->is_omap16xx)
+ omap_dm_timer_disable(timer);
/* change the timer clock source */
ret = pdata->set_timer_src(timer->pdev, source);
- omap_dm_timer_enable(timer);
+ if (!pdata->is_omap16xx)
+ omap_dm_timer_enable(timer);
/*
* When the functional clock disappears, too quick writes seem
@@ -600,11 +630,26 @@ static int __devinit omap_dm_timer_probe(struct platform_device *pdev)
return -ENODEV;
}
+ /*
+ * OMAP2+
+ * Early timers are already registered and in list.
+ * What we need to do during second phase of probe
+ * is to assign the newly allocated/configured pdev
+ * to timer->pdev. We also call pm_runtime_enable()
+ * for each device because it could not be called
+ * during early boot because pm_runtime framework
+ * was not yet up and running.
+ */
spin_lock_irqsave(&dm_timer_lock, flags);
list_for_each_entry(timer, &omap_timer_list, node)
if (!pdata->is_early_init && timer->id == pdev->id) {
timer->pdev = pdev;
spin_unlock_irqrestore(&dm_timer_lock, flags);
+ pm_runtime_enable(&pdev->dev);
+ /* update PM runtime for active early timers */
+ if (timer->reserved)
+ pm_runtime_get_sync(&pdev->dev);
+
dev_dbg(&pdev->dev, "Regular Probed\n");
return 0;
}
--
1.6.0.4
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