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authorKai Vehmanen <kai.vehmanen@linux.intel.com>2021-02-05 20:46:28 +0200
committerTakashi Iwai <tiwai@suse.de>2021-02-08 15:56:35 +0100
commitf9e5fd1b666e9d34c94b91808bda02c2d4d00776 (patch)
treeae397987c95a1098e4bee6e6f77b6c6a897dc6e6 /sound/hda/hdac_bus.c
parentc237813e3a1039331cf3d0bffba895b0ab52710a (diff)
ALSA: hda: add link_power op to hdac_bus_ops
The extended HDA bus (hdac_ext) provides interfaces for more fine-grained control of individual links than what plain HDA provides for. Links can be powered off when they are not used and if all links are released, controller can shut down the command DMA. These interfaces are currently not used by common HDA codec drivers. When a HDA codec is runtime suspended, it calls snd_hdac_codec_link_down(), but there is no link to the HDA extended bus, and on controller side the links are shut down only when all codecs are suspended. This patch adds link_power() to hdac_bus ops. Controllers using the HDA extended core, can use this to plug in snd_hdac_ext_bus_link_power() to implement more fine-grained control of link power. No change is needed for plain HDA controllers nor to existing HDA codec drivers. Co-developed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20210205184630.1938761-2-kai.vehmanen@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/hda/hdac_bus.c')
-rw-r--r--sound/hda/hdac_bus.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c
index 9766f6af8743..71db8592b33d 100644
--- a/sound/hda/hdac_bus.c
+++ b/sound/hda/hdac_bus.c
@@ -17,6 +17,7 @@ static void snd_hdac_bus_process_unsol_events(struct work_struct *work);
static const struct hdac_bus_ops default_ops = {
.command = snd_hdac_bus_send_cmd,
.get_response = snd_hdac_bus_get_response,
+ .link_power = snd_hdac_bus_link_power,
};
/**
@@ -264,3 +265,25 @@ void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,
}
EXPORT_SYMBOL_GPL(snd_hdac_aligned_write);
#endif /* CONFIG_SND_HDA_ALIGNED_MMIO */
+
+void snd_hdac_codec_link_up(struct hdac_device *codec)
+{
+ struct hdac_bus *bus = codec->bus;
+
+ if (bus->ops->link_power)
+ bus->ops->link_power(codec, true);
+ else
+ snd_hdac_bus_link_power(codec, true);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_codec_link_up);
+
+void snd_hdac_codec_link_down(struct hdac_device *codec)
+{
+ struct hdac_bus *bus = codec->bus;
+
+ if (bus->ops->link_power)
+ bus->ops->link_power(codec, false);
+ else
+ snd_hdac_bus_link_power(codec, false);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_codec_link_down);