Staging: sst: Add runtime PM support

This adds runtime PM support for audio driver.
This also fixes LPA audio mode for moorestown platform

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/staging/intel_sst/intel_sst_app_interface.c b/drivers/staging/intel_sst/intel_sst_app_interface.c
index c1ca39ef364..4b316ccab41 100644
--- a/drivers/staging/intel_sst/intel_sst_app_interface.c
+++ b/drivers/staging/intel_sst/intel_sst_app_interface.c
@@ -35,6 +35,7 @@
 #include <linux/aio.h>
 #include <linux/uaccess.h>
 #include <linux/firmware.h>
+#include <linux/pm_runtime.h>
 #include <linux/ioctl.h>
 #include <linux/smp_lock.h>
 #ifdef CONFIG_MRST_RAR_HANDLER
@@ -103,8 +104,10 @@ int intel_sst_open(struct inode *i_node, struct file *file_ptr)
         unsigned int retval;
 
         mutex_lock(&sst_drv_ctx->stream_lock);
+        pm_runtime_get_sync(&sst_drv_ctx->pci->dev);
         retval = intel_sst_check_device();
         if (retval) {
+                pm_runtime_put(&sst_drv_ctx->pci->dev);
                 mutex_unlock(&sst_drv_ctx->stream_lock);
                 return retval;
         }
@@ -113,6 +116,7 @@ int intel_sst_open(struct inode *i_node, struct file *file_ptr)
                 struct ioctl_pvt_data *data =
                         kzalloc(sizeof(struct ioctl_pvt_data), GFP_KERNEL);
                 if (!data) {
+                        pm_runtime_put(&sst_drv_ctx->pci->dev);
                         mutex_unlock(&sst_drv_ctx->stream_lock);
                         return -ENOMEM;
                 }
@@ -125,6 +129,7 @@ int intel_sst_open(struct inode *i_node, struct file *file_ptr)
                 pr_debug("pvt_id handle = %d!\n", data->pvt_id);
         } else {
                 retval = -EUSERS;
+                pm_runtime_put(&sst_drv_ctx->pci->dev);
                 mutex_unlock(&sst_drv_ctx->stream_lock);
         }
         return retval;
@@ -147,8 +152,10 @@ int intel_sst_open_cntrl(struct inode *i_node, struct file *file_ptr)
 
         /* audio manager open */
         mutex_lock(&sst_drv_ctx->stream_lock);
+        pm_runtime_get_sync(&sst_drv_ctx->pci->dev);
         retval = intel_sst_check_device();
         if (retval) {
+                pm_runtime_put(&sst_drv_ctx->pci->dev);
                 mutex_unlock(&sst_drv_ctx->stream_lock);
                 return retval;
         }
@@ -157,8 +164,10 @@ int intel_sst_open_cntrl(struct inode *i_node, struct file *file_ptr)
                 sst_drv_ctx->am_cnt++;
                 pr_debug("AM handle opened...\n");
                 file_ptr->private_data = NULL;
-        } else
+        } else {
                 retval = -EACCES;
+                pm_runtime_put(&sst_drv_ctx->pci->dev);
+        }
 
         mutex_unlock(&sst_drv_ctx->stream_lock);
         return retval;
@@ -181,6 +190,7 @@ int intel_sst_release(struct inode *i_node, struct file *file_ptr)
         mutex_lock(&sst_drv_ctx->stream_lock);
         sst_drv_ctx->encoded_cnt--;
         sst_drv_ctx->stream_cnt--;
+        pm_runtime_put(&sst_drv_ctx->pci->dev);
         mutex_unlock(&sst_drv_ctx->stream_lock);
         free_stream_context(data->str_id);
         kfree(data);
@@ -192,6 +202,7 @@ int intel_sst_release_cntrl(struct inode *i_node, struct file *file_ptr)
         /* audio manager close */
         mutex_lock(&sst_drv_ctx->stream_lock);
         sst_drv_ctx->am_cnt--;
+        pm_runtime_put(&sst_drv_ctx->pci->dev);
         mutex_unlock(&sst_drv_ctx->stream_lock);
         pr_debug("AM handle closed\n");
         return 0;