On loongson controller, after calling snd_hdac_stream_updateb()
to enable DMA engine, the SDnCTL.STRM will become to zero. We
need to access SDnCTL in dword to keep SDnCTL.STRM is not changed.
Signed-off-by: Yanteng Si <siyanteng@xxxxxxxxxxx>
Signed-off-by: Yingkun Meng <mengyingkun@xxxxxxxxxxx>
---
include/sound/hdaudio.h | 1 +
sound/hda/hdac_stream.c | 6 +++++-
sound/pci/hda/hda_intel.c | 1 +
3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index a1dcc7f97d08..859becb0eaba 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -348,6 +348,7 @@ struct hdac_bus {
bool polling_mode:1;
bool no_intr_polling_mode:1;
bool needs_damn_long_delay:1;
+ bool access_sdnctl_in_dword:1;
int poll_count;
diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index 1f56fd33b9af..2633a4bb1d85 100644
--- a/sound/hda/hdac_stream.c
+++ b/sound/hda/hdac_stream.c
@@ -150,7 +150,11 @@ void snd_hdac_stream_start(struct hdac_stream *azx_dev)
stripe_ctl);
}
/* set DMA start and interrupt mask */
- snd_hdac_stream_updateb(azx_dev, SD_CTL,
+ if (bus->access_sdnctl_in_dword)
+ snd_hdac_stream_updatel(azx_dev, SD_CTL,
+ 0, SD_CTL_DMA_START | SD_INT_MASK);
+ else
+ snd_hdac_stream_updateb(azx_dev, SD_CTL,
0, SD_CTL_DMA_START | SD_INT_MASK);
azx_dev->running = true;
}
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 1e8993836fc6..0222a1721b4d 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1877,6 +1877,7 @@ static int azx_first_init(struct azx *chip)
if (chip->driver_type == AZX_DRIVER_LOONGSON) {
bus->no_intr_polling_mode = 1;
+ bus->access_sdnctl_in_dword = 1;
}
err = pcim_iomap_regions(pci, 1 << 0, "ICH HD audio");
--
2.31.4
