drm/tegra: dsi: Enhance runtime power management

[cascardo/linux.git] / drivers / gpu / host1x / mipi.c

diff --git a/drivers/gpu/host1x/mipi.c b/drivers/gpu/host1x/mipi.c
index 52a6fd2..e00809d 100644 (file)
--- a/drivers/gpu/host1x/mipi.c
+++ b/drivers/gpu/host1x/mipi.c
@@ -242,20 +242,6 @@ struct tegra_mipi_device *tegra_mipi_request(struct device *device)
        dev->pads = args.args[0];
        dev->device = device;
 
-       mutex_lock(&dev->mipi->lock);
-
-       if (dev->mipi->usage_count++ == 0) {
-               err = tegra_mipi_power_up(dev->mipi);
-               if (err < 0) {
-                       dev_err(dev->mipi->dev,
-                               "failed to power up MIPI bricks: %d\n",
-                               err);
-                       return ERR_PTR(err);
-               }
-       }
-
-       mutex_unlock(&dev->mipi->lock);
-
        return dev;
 
 put:
@@ -270,29 +256,42 @@ EXPORT_SYMBOL(tegra_mipi_request);
 
 void tegra_mipi_free(struct tegra_mipi_device *device)
 {
-       int err;
+       platform_device_put(device->pdev);
+       kfree(device);
+}
+EXPORT_SYMBOL(tegra_mipi_free);
 
-       mutex_lock(&device->mipi->lock);
+int tegra_mipi_enable(struct tegra_mipi_device *dev)
+{
+       int err = 0;
 
-       if (--device->mipi->usage_count == 0) {
-               err = tegra_mipi_power_down(device->mipi);
-               if (err < 0) {
-                       /*
-                        * Not much that can be done here, so an error message
-                        * will have to do.
-                        */
-                       dev_err(device->mipi->dev,
-                               "failed to power down MIPI bricks: %d\n",
-                               err);
-               }
-       }
+       mutex_lock(&dev->mipi->lock);
 
-       mutex_unlock(&device->mipi->lock);
+       if (dev->mipi->usage_count++ == 0)
+               err = tegra_mipi_power_up(dev->mipi);
+
+       mutex_unlock(&dev->mipi->lock);
+
+       return err;
 
-       platform_device_put(device->pdev);
-       kfree(device);
 }
-EXPORT_SYMBOL(tegra_mipi_free);
+EXPORT_SYMBOL(tegra_mipi_enable);
+
+int tegra_mipi_disable(struct tegra_mipi_device *dev)
+{
+       int err = 0;
+
+       mutex_lock(&dev->mipi->lock);
+
+       if (--dev->mipi->usage_count == 0)
+               err = tegra_mipi_power_down(dev->mipi);
+
+       mutex_unlock(&dev->mipi->lock);
+
+       return err;
+
+}
+EXPORT_SYMBOL(tegra_mipi_disable);
 
 static int tegra_mipi_wait(struct tegra_mipi *mipi)
 {