vga_switcheroo: Deduplicate power state tracking

If DRM drivers use runtime PM, they currently notify vga_switcheroo
whenever they ->runtime_suspend or ->runtime_resume to update
vga_switcheroo's internal power state tracking.

That's essentially a duplication of a functionality performed by the
PM core as it already tracks the GPU's power state and vga_switcheroo
can always query it.

Introduce a new internal helper vga_switcheroo_pwr_state() which does
just that if runtime PM is used, or falls back to vga_switcheroo's
internal power state tracking if manual power control is used.
Drop a redundant power state check in set_audio_state() while at it.

This removes one of the two purposes of the notification mechanism
implemented by vga_switcheroo_set_dynamic_switch().  The other one is
power management of the audio device and we'll remove that next.

Cc: Dave Airlie <airlied@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Tested-by: Kai Heng Feng <kai.heng.feng@canonical.com> # AMD PowerXpress
Tested-by: Mike Lothian <mike@fireburn.co.uk>          # AMD PowerXpress
Tested-by: Denis Lisov <dennis.lissov@gmail.com>       # Nvidia Optimus
Tested-by: Peter Wu <peter@lekensteyn.nl>              # Nvidia Optimus
Tested-by: Lukas Wunner <lukas@wunner.de>              # MacBook Pro
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://patchwork.freedesktop.org/patch/msgid/0aa49d735b988aa04524a8dc339582ace33f0f94.1520068884.git.lukas@wunner.de

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index 09dd40d..2488af7 100644 (file)
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -92,7 +92,8 @@
  * struct vga_switcheroo_client - registered client
  * @pdev: client pci device
  * @fb_info: framebuffer to which console is remapped on switching
- * @pwr_state: current power state
+ * @pwr_state: current power state if manual power control is used.
+ *     For driver power control, call vga_switcheroo_pwr_state().
  * @ops: client callbacks
  * @id: client identifier. Determining the id requires the handler,
  *     so gpus are initially assigned VGA_SWITCHEROO_UNKNOWN_ID
@@ -406,6 +407,19 @@ bool vga_switcheroo_client_probe_defer(struct pci_dev *pdev)
 }
 EXPORT_SYMBOL(vga_switcheroo_client_probe_defer);
 
+static enum vga_switcheroo_state
+vga_switcheroo_pwr_state(struct vga_switcheroo_client *client)
+{
+       if (client->driver_power_control)
+               if (pm_runtime_enabled(&client->pdev->dev) &&
+                   pm_runtime_active(&client->pdev->dev))
+                       return VGA_SWITCHEROO_ON;
+               else
+                       return VGA_SWITCHEROO_OFF;
+       else
+               return client->pwr_state;
+}
+
 /**
  * vga_switcheroo_get_client_state() - obtain power state of a given client
  * @pdev: client pci device
@@ -425,7 +439,7 @@ enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *pdev)
        if (!client)
                ret = VGA_SWITCHEROO_NOT_FOUND;
        else
-               ret = client->pwr_state;
+               ret = vga_switcheroo_pwr_state(client);
        mutex_unlock(&vgasr_mutex);
        return ret;
 }
@@ -598,7 +612,7 @@ static int vga_switcheroo_show(struct seq_file *m, void *v)
                           client_is_vga(client) ? "" : "-Audio",
                           client->active ? '+' : ' ',
                           client->driver_power_control ? "Dyn" : "",
-                          client->pwr_state ? "Pwr" : "Off",
+                          vga_switcheroo_pwr_state(client) ? "Pwr" : "Off",
                           pci_name(client->pdev));
                i++;
        }
@@ -641,7 +655,7 @@ static void set_audio_state(enum vga_switcheroo_client_id id,
        struct vga_switcheroo_client *client;
 
        client = find_client_from_id(&vgasr_priv.clients, id | ID_BIT_AUDIO);
-       if (client && client->pwr_state != state) {
+       if (client) {
                client->ops->set_gpu_state(client->pdev, state);
                client->pwr_state = state;
        }
@@ -656,7 +670,7 @@ static int vga_switchto_stage1(struct vga_switcheroo_client *new_client)
        if (!active)
                return 0;
 
-       if (new_client->pwr_state == VGA_SWITCHEROO_OFF)
+       if (vga_switcheroo_pwr_state(new_client) == VGA_SWITCHEROO_OFF)
                vga_switchon(new_client);
 
        vga_set_default_device(new_client->pdev);
@@ -695,7 +709,7 @@ static int vga_switchto_stage2(struct vga_switcheroo_client *new_client)
        if (new_client->ops->reprobe)
                new_client->ops->reprobe(new_client->pdev);
 
-       if (active->pwr_state == VGA_SWITCHEROO_ON)
+       if (vga_switcheroo_pwr_state(active) == VGA_SWITCHEROO_ON)
                vga_switchoff(active);
 
        set_audio_state(new_client->id, VGA_SWITCHEROO_ON);
@@ -940,8 +954,7 @@ EXPORT_SYMBOL(vga_switcheroo_process_delayed_switch);
  * command line disables it.
  *
  * When the driver decides to power up or down, it notifies vga_switcheroo
- * thereof so that it can (a) power the audio device on the GPU up or down,
- * and (b) update its internal power state representation for the device.
+ * thereof so that it can power the audio device on the GPU up or down.
  * This is achieved by vga_switcheroo_set_dynamic_switch().
  *
  * After the GPU has been suspended, the handler needs to be called to cut
@@ -985,9 +998,8 @@ static void vga_switcheroo_power_switch(struct pci_dev *pdev,
  *
  * Helper for GPUs whose power state is controlled by the driver's runtime pm.
  * When the driver decides to power up or down, it notifies vga_switcheroo
- * thereof using this helper so that it can (a) power the audio device on
- * the GPU up or down, and (b) update its internal power state representation
- * for the device.
+ * thereof using this helper so that it can power the audio device on the GPU
+ * up or down.
  */
 void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev,
                                       enum vga_switcheroo_state dynamic)
@@ -1001,7 +1013,6 @@ void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev,
                return;
        }
 
-       client->pwr_state = dynamic;
        set_audio_state(client->id, dynamic);
        mutex_unlock(&vgasr_mutex);
 }