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authorJeeja KP <jeeja.kp@intel.com>2015-12-18 15:11:59 +0530
committerMark Brown <broonie@kernel.org>2016-01-10 12:02:30 +0000
commita9c48f7f5906d02d4ec4aa50b1c20fccbce53eec (patch)
tree845f455a73f44b45c1f6d075ce73ab76b0363677 /sound/hda
parent1e83b0475a6833a2cb88beeb79f095b0cf4b40db (diff)
downloadlinux-a9c48f7f5906d02d4ec4aa50b1c20fccbce53eec.tar.bz2
ALSA: hdac: Add support for hda DMA Resume capability
Skylake sports new capability of DMA resume, DRSM where we can resume the DMA. This capability is defined by presence of AZX_DRSM_CAP_ID. If this capability is present, we use this capability. So we add: snd_hdac_ext_stream_drsm_enable() - DMA resume caps snd_hdac_ext_stream_set_dpibr() - set the DMA position snd_hdac_ext_stream_set_lpib() - set the lpib Signed-off-by: Jeeja KP <jeeja.kp@intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/hda')
-rw-r--r--sound/hda/ext/hdac_ext_controller.c6
-rw-r--r--sound/hda/ext/hdac_ext_stream.c71
2 files changed, 77 insertions, 0 deletions
diff --git a/sound/hda/ext/hdac_ext_controller.c b/sound/hda/ext/hdac_ext_controller.c
index 63215b17247c..556267e75591 100644
--- a/sound/hda/ext/hdac_ext_controller.c
+++ b/sound/hda/ext/hdac_ext_controller.c
@@ -77,6 +77,12 @@ int snd_hdac_ext_bus_parse_capabilities(struct hdac_ext_bus *ebus)
ebus->spbcap = bus->remap_addr + offset;
break;
+ case AZX_DRSM_CAP_ID:
+ /* DMA resume capability found, handler function */
+ dev_dbg(bus->dev, "Found DRSM capability\n");
+ ebus->drsmcap = bus->remap_addr + offset;
+ break;
+
default:
dev_dbg(bus->dev, "Unknown capability %d\n", cur_cap);
break;
diff --git a/sound/hda/ext/hdac_ext_stream.c b/sound/hda/ext/hdac_ext_stream.c
index cb89ec7c8147..8f30e8836818 100644
--- a/sound/hda/ext/hdac_ext_stream.c
+++ b/sound/hda/ext/hdac_ext_stream.c
@@ -59,6 +59,10 @@ void snd_hdac_ext_stream_init(struct hdac_ext_bus *ebus,
AZX_SPB_MAXFIFO;
}
+ if (ebus->drsmcap)
+ stream->dpibr_addr = ebus->drsmcap + AZX_DRSM_BASE +
+ AZX_DRSM_INTERVAL * idx;
+
stream->decoupled = false;
snd_hdac_stream_init(bus, &stream->hstream, idx, direction, tag);
}
@@ -497,3 +501,70 @@ void snd_hdac_ext_stop_streams(struct hdac_ext_bus *ebus)
}
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stop_streams);
+
+/**
+ * snd_hdac_ext_stream_drsm_enable - enable DMA resume for a stream
+ * @ebus: HD-audio ext core bus
+ * @enable: flag to enable/disable DRSM
+ * @index: stream index for which DRSM need to be enabled
+ */
+void snd_hdac_ext_stream_drsm_enable(struct hdac_ext_bus *ebus,
+ bool enable, int index)
+{
+ u32 mask = 0;
+ u32 register_mask = 0;
+ struct hdac_bus *bus = &ebus->bus;
+
+ if (!ebus->drsmcap) {
+ dev_err(bus->dev, "Address of DRSM capability is NULL");
+ return;
+ }
+
+ mask |= (1 << index);
+
+ register_mask = readl(ebus->drsmcap + AZX_REG_SPB_SPBFCCTL);
+
+ mask |= register_mask;
+
+ if (enable)
+ snd_hdac_updatel(ebus->drsmcap, AZX_REG_DRSM_CTL, 0, mask);
+ else
+ snd_hdac_updatel(ebus->drsmcap, AZX_REG_DRSM_CTL, mask, 0);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_drsm_enable);
+
+/**
+ * snd_hdac_ext_stream_set_dpibr - sets the dpibr value of a stream
+ * @ebus: HD-audio ext core bus
+ * @stream: hdac_ext_stream
+ * @value: dpib value to set
+ */
+int snd_hdac_ext_stream_set_dpibr(struct hdac_ext_bus *ebus,
+ struct hdac_ext_stream *stream, u32 value)
+{
+ struct hdac_bus *bus = &ebus->bus;
+
+ if (!ebus->drsmcap) {
+ dev_err(bus->dev, "Address of DRSM capability is NULL");
+ return -EINVAL;
+ }
+
+ writel(value, stream->dpibr_addr);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_dpibr);
+
+/**
+ * snd_hdac_ext_stream_set_lpib - sets the lpib value of a stream
+ * @ebus: HD-audio ext core bus
+ * @stream: hdac_ext_stream
+ * @value: lpib value to set
+ */
+int snd_hdac_ext_stream_set_lpib(struct hdac_ext_stream *stream, u32 value)
+{
+ snd_hdac_stream_writel(&stream->hstream, SD_LPIB, value);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_lpib);