ALSA: hda: Refactor display power management

The current HD-audio code manages the DRM audio power via too complex
redirections, and this seems even still unbalanced in a corner case as
Intel DRM CI has been intermittently reporting.  This patch is a big
surgery for addressing the complexity and the possible unbalance.

Basically the patch changes the display PM in the following ways:

- Both HD-audio controller and codec drivers call a single helper,
  snd_hdac_display_power().  (Formerly, the display power control from
  a codec was done indirectly via link_power bus ops.)

- snd_hdac_display_power() receives the codec address index.  For
  turning on/off from the controller, pass HDA_CODEC_IDX_CONTROLLER.

- snd_hdac_display_power() doesn't manage refcounts any longer, but
  keeps the power status in bitmap.  If any of controller or codecs is
  turned on, the function updates the DRM power state via get_power()
  or put_power().

Also this refactor allows us more cleanup:

- The link_power bus ops is dropped, so there is no longer indirect
  management, as mentioned in the above.

- hdac_device link_power_control flag is moved to hda_codec
  display_power_control flag, as it's only for HDA legacy.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106525
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 0 insertions, 17 deletions

diff --git a/sound/hda/hdac_device.c b/sound/hda/hdac_device.c
index dbf02a3a8d2f..95b073ee4b32 100644
--- a/sound/hda/hdac_device.c
+++ b/sound/hda/hdac_device.c
@@ -622,23 +622,6 @@ int snd_hdac_power_down_pm(struct hdac_device *codec)
 EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);
 #endif
 
-/**
- * snd_hdac_link_power - Enable/disable the link power for a codec
- * @codec: the codec object
- * @bool: enable or disable the link power
- */
-int snd_hdac_link_power(struct hdac_device *codec, bool enable)
-{
-	if  (!codec->link_power_control)
-		return 0;
-
-	if  (codec->bus->ops->link_power)
-		return codec->bus->ops->link_power(codec->bus, enable);
-	else
-		return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(snd_hdac_link_power);
-
 /* codec vendor labels */
 struct hda_vendor_id {
 	unsigned int id;