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authorUlf Hansson <ulf.hansson@linaro.org>2014-03-01 11:56:07 +0100
committerMark Brown <broonie@linaro.org>2014-03-06 05:44:48 +0100
commit84a5dc41f64faadb79cde600b130c8cbd7e21977 (patch)
tree281812efcb7a1c3fd46ec0b658062cfee366cf52
parentspi: pl022: Let runtime PM callbacks be available for CONFIG_PM (diff)
downloadlinux-84a5dc41f64faadb79cde600b130c8cbd7e21977.tar.xz
linux-84a5dc41f64faadb79cde600b130c8cbd7e21977.zip
spi: pl022: Don't ignore power domain and amba bus at system suspend
Previously only the resources controlled by the driver were put into low power state at system suspend. Both the amba bus and a potential power domain were ignored. Moreover, while putting the device into low power state we first brought it back to full power, but for no particular reason. To handle both issues above, use pm_runtime_force_suspend|resume() from the system suspend|resume callbacks. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Mark Brown <broonie@linaro.org>
-rw-r--r--drivers/spi/spi-pl022.c54
1 files changed, 18 insertions, 36 deletions
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 6dfcabf74728..d37e840944d6 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -2277,35 +2277,7 @@ pl022_remove(struct amba_device *adev)
return 0;
}
-#ifdef CONFIG_PM
-/*
- * These two functions are used from both suspend/resume and
- * the runtime counterparts to handle external resources like
- * clocks, pins and regulators when going to sleep.
- */
-static void pl022_suspend_resources(struct pl022 *pl022, bool runtime)
-{
- clk_disable_unprepare(pl022->clk);
-
- if (runtime)
- pinctrl_pm_select_idle_state(&pl022->adev->dev);
- else
- pinctrl_pm_select_sleep_state(&pl022->adev->dev);
-}
-
-static void pl022_resume_resources(struct pl022 *pl022, bool runtime)
-{
- /* First go to the default state */
- pinctrl_pm_select_default_state(&pl022->adev->dev);
- if (!runtime)
- /* Then let's idle the pins until the next transfer happens */
- pinctrl_pm_select_idle_state(&pl022->adev->dev);
-
- clk_prepare_enable(pl022->clk);
-}
-#endif
-
-#ifdef CONFIG_SUSPEND
+#ifdef CONFIG_PM_SLEEP
static int pl022_suspend(struct device *dev)
{
struct pl022 *pl022 = dev_get_drvdata(dev);
@@ -2317,8 +2289,13 @@ static int pl022_suspend(struct device *dev)
return ret;
}
- pm_runtime_get_sync(dev);
- pl022_suspend_resources(pl022, false);
+ ret = pm_runtime_force_suspend(dev);
+ if (ret) {
+ spi_master_resume(pl022->master);
+ return ret;
+ }
+
+ pinctrl_pm_select_sleep_state(dev);
dev_dbg(dev, "suspended\n");
return 0;
@@ -2329,8 +2306,9 @@ static int pl022_resume(struct device *dev)
struct pl022 *pl022 = dev_get_drvdata(dev);
int ret;
- pl022_resume_resources(pl022, false);
- pm_runtime_put(dev);
+ ret = pm_runtime_force_resume(dev);
+ if (ret)
+ dev_err(dev, "problem resuming\n");
/* Start the queue running */
ret = spi_master_resume(pl022->master);
@@ -2341,14 +2319,16 @@ static int pl022_resume(struct device *dev)
return ret;
}
-#endif /* CONFIG_PM */
+#endif
#ifdef CONFIG_PM
static int pl022_runtime_suspend(struct device *dev)
{
struct pl022 *pl022 = dev_get_drvdata(dev);
- pl022_suspend_resources(pl022, true);
+ clk_disable_unprepare(pl022->clk);
+ pinctrl_pm_select_idle_state(dev);
+
return 0;
}
@@ -2356,7 +2336,9 @@ static int pl022_runtime_resume(struct device *dev)
{
struct pl022 *pl022 = dev_get_drvdata(dev);
- pl022_resume_resources(pl022, true);
+ pinctrl_pm_select_default_state(dev);
+ clk_prepare_enable(pl022->clk);
+
return 0;
}
#endif