spi: Provide core support for runtime PM during transfers

[karo-tx-linux.git] / drivers / spi / spi.c

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 978dda2c523982f62c676573feb1955da0ca82da..361cced68069ef41aefb2b57e4b33dfa340bfcef 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -553,6 +553,10 @@ static void spi_pump_messages(struct kthread_work *work)
                    master->unprepare_transfer_hardware(master))
                        dev_err(&master->dev,
                                "failed to unprepare transfer hardware\n");
+               if (master->auto_runtime_pm) {
+                       pm_runtime_mark_last_busy(master->dev.parent);
+                       pm_runtime_put_autosuspend(master->dev.parent);
+               }
                return;
        }
 
@@ -572,11 +576,23 @@ static void spi_pump_messages(struct kthread_work *work)
                master->busy = true;
        spin_unlock_irqrestore(&master->queue_lock, flags);
 
+       if (!was_busy && master->auto_runtime_pm) {
+               ret = pm_runtime_get_sync(master->dev.parent);
+               if (ret < 0) {
+                       dev_err(&master->dev, "Failed to power device: %d\n",
+                               ret);
+                       return;
+               }
+       }
+
        if (!was_busy && master->prepare_transfer_hardware) {
                ret = master->prepare_transfer_hardware(master);
                if (ret) {
                        dev_err(&master->dev,
                                "failed to prepare transfer hardware\n");
+
+                       if (master->auto_runtime_pm)
+                               pm_runtime_put(master->dev.parent);
                        return;
                }
        }