Commit 942ccdd8 authored by Yanteng Si's avatar Yanteng Si Committed by Takashi Iwai
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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: default avatarYanteng Si <siyanteng@loongson.cn>
Signed-off-by: default avatarYingkun Meng <mengyingkun@loongson.cn>
Acked-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Link: https://lore.kernel.org/r/27aeddf5ebbe7c69631cec0e489c1b264be94990.1686128807.git.siyanteng@loongson.cn


Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent cbc3e98a

include/sound/hdaudio.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

sound/hda/hdac_stream.c

+5 −1
Original line number Diff line number Diff line
@@ -150,6 +150,10 @@ void snd_hdac_stream_start(struct hdac_stream *azx_dev) 
					stripe_ctl);

	}

	/* set DMA start and interrupt mask */

	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;

sound/pci/hda/hda_intel.c

+1 −0
Original line number Diff line number Diff line
@@ -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");