spi: Provide core support for runtime PM during transfers

Most SPI drivers that implement runtime PM support use identical code to
do so: they acquire a runtime PM lock in prepare_transfer_hardware() and
then they release it in unprepare_transfer_hardware(). The variations in
this are mostly missing error checking and the choice to use autosuspend.

Since these runtime PM calls are normally the only thing in the prepare
and unprepare callbacks and the autosuspend API transparently does the
right thing on devices with autosuspend disabled factor all of this out
into the core with a flag to enable the behaviour.

Signed-off-by: Mark Brown <broonie@linaro.org>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 978dda2c5239..361cced68069 100644
--- 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;
                 }
         }