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[2/3] ALSA: hda: ext: add spib to stream context

Message ID 1517304986-16847-3-git-send-email-sriramx.periyasamy@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Sriram Periyasamy Jan. 30, 2018, 9:36 a.m. UTC 
From: Ramesh Babu <ramesh.babu@intel.com>

Platforms like skylake support SPIB (software position index in
Buffer) capability, through which application pointer can be
programmed in DMA. This helps DMA stop rendering stale data.

This patch saves spib values in stream context which can be
restored during resume from S3.

Signed-off-by: Ramesh Babu <ramesh.babu@intel.com>
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Sriram Periyasamy <sriramx.periyasamy@intel.com>
---
 include/sound/hdaudio_ext.h     | 1 +
 sound/hda/ext/hdac_ext_stream.c | 2 ++
 2 files changed, 3 insertions(+)
diff mbox

Patch

diff --git a/include/sound/hdaudio_ext.h b/include/sound/hdaudio_ext.h
index 9c14e21dda85..34c41496fbc7 100644
--- a/include/sound/hdaudio_ext.h
+++ b/include/sound/hdaudio_ext.h
@@ -89,6 +89,7 @@  struct hdac_ext_stream {
 
 	u32 dpib;
 	u32 lpib;
+	u32 spib;
 	bool decoupled:1;
 	bool link_locked:1;
 	bool link_prepared;
diff --git a/sound/hda/ext/hdac_ext_stream.c b/sound/hda/ext/hdac_ext_stream.c
index c96d7a7a36af..c5212709bdb7 100644
--- a/sound/hda/ext/hdac_ext_stream.c
+++ b/sound/hda/ext/hdac_ext_stream.c
@@ -461,6 +461,8 @@  int snd_hdac_ext_stream_set_spib(struct hdac_ext_bus *ebus,
 	}
 
 	writel(value, stream->spib_addr);
+	/* save the spib value in stream context */
+	stream->spib = value;
 
 	return 0;
 }