Commit 8af294b4 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: dapm: Fix handling of loops 



Currently if a path loops back on itself we correctly skip over it to
avoid going into an infinite loop but this causes us to ignore the need
to power up the path as we don't count the loop for the purposes of
counting inputs and outputs. This means that internal loopbacks within a
device that have powered devices on them won't be powered up.

Fix this by treating any path that is currently in the process of being
recursed as having a single input or output so that it is counted for
the purposes of power decisions.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: default avatarLiam Girdwood <liam.r.girdwood@linux.intel.com>
parent 19f949f5

include/sound/soc-dapm.h

+1 −0
Original line number Diff line number Diff line
@@ -488,6 +488,7 @@ struct snd_soc_dapm_path { 
	/* status */

	u32 connect:1;	/* source and sink widgets are connected */

	u32 walked:1;	/* path has been walked */

	u32 walking:1;  /* path is in the process of being walked */

	u32 weak:1;	/* path ignored for power management */



	int (*connected)(struct snd_soc_dapm_widget *source,

sound/soc/soc-dapm.c

+15 −0
Original line number Diff line number Diff line
@@ -821,6 +821,7 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget, 
		    (widget->id == snd_soc_dapm_line &&

		     !list_empty(&widget->sources))) {

			widget->outputs = snd_soc_dapm_suspend_check(widget);

			path->walking = 0;

			return widget->outputs;

		}

	}
@@ -831,6 +832,9 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget, 
		if (path->weak)

			continue;



		if (path->walking)

			return 1;



		if (path->walked)

			continue;
@@ -838,6 +842,7 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget, 


		if (path->sink && path->connect) {

			path->walked = 1;

			path->walking = 1;



			/* do we need to add this widget to the list ? */

			if (list) {
@@ -847,11 +852,14 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget, 
					dev_err(widget->dapm->dev,

						"ASoC: could not add widget %s\n",

						widget->name);

					path->walking = 0;

					return con;

				}

			}



			con += is_connected_output_ep(path->sink, list);



			path->walking = 0;

		}

	}
@@ -931,6 +939,9 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget, 
		if (path->weak)

			continue;



		if (path->walking)

			return 1;



		if (path->walked)

			continue;
@@ -938,6 +949,7 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget, 


		if (path->source && path->connect) {

			path->walked = 1;

			path->walking = 1;



			/* do we need to add this widget to the list ? */

			if (list) {
@@ -947,11 +959,14 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget, 
					dev_err(widget->dapm->dev,

						"ASoC: could not add widget %s\n",

						widget->name);

					path->walking = 0;

					return con;

				}

			}



			con += is_connected_input_ep(path->source, list);



			path->walking = 0;

		}

	}

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