This patch adds the functions to gate the xp70 clock on
suspend and resume.
Signed-off-by: Ludovic Barre <ludovic.barre@xxxxxx>
Signed-off-by: Peter Griffin <peter.griffin@xxxxxxxxxx>
---
drivers/dma/st_fdma.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
diff --git a/drivers/dma/st_fdma.c b/drivers/dma/st_fdma.c
index 4288e79..de3afefb 100644
--- a/drivers/dma/st_fdma.c
+++ b/drivers/dma/st_fdma.c
@@ -1127,10 +1127,56 @@ static int st_fdma_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int st_fdma_pm_suspend(struct device *dev)
+{
+ struct st_fdma_dev *fdev = dev_get_drvdata(dev);
+ int ret;
+
+ if (atomic_read(&fdev->fw_loaded)) {
+ ret = st_fdma_disable(fdev);
+ if (ret & FDMA_EN_RUN) {
+ dev_warn(fdev->dev, "Failed to disable channels");
+ return -EBUSY;
+ }
+ }
+
+ st_fdma_clk_disable(fdev);
+
+ return 0;
+}
+
+static int st_fdma_pm_resume(struct device *dev)
+{
+ struct st_fdma_dev *fdev = dev_get_drvdata(dev);
+ int ret;
+
+ ret = st_fdma_clk_enable(fdev);
+ if (ret) {
+ dev_err(fdev->dev, "Failed to enable clocks\n");
+ goto out;
+ }
+
+ ret = st_fdma_get_fw(fdev);
+out:
+ return ret;
+}
+
+static const struct dev_pm_ops st_fdma_pm = {
+ .suspend_late = st_fdma_pm_suspend,
+ .resume_early = st_fdma_pm_resume,
+};
+
+#define ST_FDMA_PM (&st_fdma_pm)
+#else
+#define ST_FDMA_PM NULL
+#endif
+
static struct platform_driver st_fdma_platform_driver = {
.driver = {
.name = "st-fdma",
.of_match_table = st_fdma_match,
+ .pm = ST_FDMA_PM,
},
.probe = st_fdma_probe,
.remove = st_fdma_remove,
--
1.9.1
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