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ALSA: hda: Workaround for SDnCTL register on loongson 

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@loongson.cn>
Signed-off-by: Yingkun Meng <mengyingkun@loongson.cn>
Acked-by: Huacai Chen <chenhuacai@loongson.cn>
Link: https://lore.kernel.org/r/27aeddf5ebbe7c69631cec0e489c1b264be94990.1686128807.git.siyanteng@loongson.cn
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Yanteng Si 2023-06-07 17:21:51 +08:00 committed by Takashi Iwai
parent cbc3e98acf
commit 942ccdd834
3 changed files with 7 additions and 1 deletions
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1
include/sound/hdaudio.h
View File

@ -348,6 +348,7 @@ struct hdac_bus {
bool polling_mode:1;
bool needs_damn_long_delay:1;
bool not_use_interrupts:1; /* prohibiting the RIRB IRQ */
bool access_sdnctl_in_dword:1; /* accessing the sdnctl register by dword */
int poll_count;

6
sound/hda/hdac_stream.c
View File

@ -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;
}

1
sound/pci/hda/hda_intel.c
View File

@ -1878,6 +1878,7 @@ static int azx_first_init(struct azx *chip)
if (chip->driver_type == AZX_DRIVER_LOONGSON) {
bus->polling_mode = 1;
bus->not_use_interrupts = 1;
bus->access_sdnctl_in_dword = 1;
}
err = pcim_iomap_regions(pci, 1 << 0, "ICH HD audio");