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authorLars-Peter Clausen <lars@metafoo.de>2014-10-25 17:42:00 +0200
committerMark Brown <broonie@kernel.org>2014-10-28 00:19:59 +0000
commitc1862c8bae520a8986dd7c47ce33f16eb7c791c2 (patch)
tree793452d0f3bfd45881c1dc057d015f521a35f952 /include/sound
parent6dd98b0a3e58b7b48a422802b5610b95ef5128eb (diff)
downloadop-kernel-dev-c1862c8bae520a8986dd7c47ce33f16eb7c791c2.zip
op-kernel-dev-c1862c8bae520a8986dd7c47ce33f16eb7c791c2.tar.gz
ASoC: dapm: Add a flag to mark paths connected to supply widgets
Supply widgets do not count towards the input and output widgets of their neighbors and for supply widgets themselves we do not care for the number of input or output paths. This means that a path that connects to a supply widget effectively behaves the same as a path that as the weak property set. This patch adds a new path flag that gets set to true when the path is connected to at least one supply widget. If a path with the flag set is encountered in is_connected_{input,output}_ep() is is skipped in the same way that weak paths are skipped. This slightly brings down the number of path checks. Since both the weak and the supply flag are implemented as bitfields which are stored in the same word there is no runtime overhead due to checking both rather than just one and also the size of the path struct is not increased by this patch. Another advantage is that we do not have to handle supply widgets in is_connected_{input,output}_ep() anymore since it will never be called for supply widgets. The only exception is from dapm_widget_power_read_file() where a check is added to special case supply widgets. Testing with the ADAU1761, which has a handful of supply widgets, shows the following changes in the DAPM stats for a playback stream start. Power Path Neighbour Before: 34 78 117 After: 34 48 117 Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/soc-dapm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 8cf3aad..e7ebeb7 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -510,6 +510,7 @@ struct snd_soc_dapm_path {
u32 connect:1; /* source and sink widgets are connected */
u32 walking:1; /* path is in the process of being walked */
u32 weak:1; /* path ignored for power management */
+ u32 is_supply:1; /* At least one of the connected widgets is a supply */
int (*connected)(struct snd_soc_dapm_widget *source,
struct snd_soc_dapm_widget *sink);
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