diff options
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/hda_tegra.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c index 45dc54485f24..0cc5fad1af8a 100644 --- a/sound/pci/hda/hda_tegra.c +++ b/sound/pci/hda/hda_tegra.c @@ -364,6 +364,23 @@ static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev) /* initialize chip */ azx_init_chip(chip, 1); + /* + * Playback (for 44.1K/48K, 2-channel, 16-bps) fails with + * 4 SDO lines due to legacy design limitation. Following + * is, from HD Audio Specification (Revision 1.0a), used to + * control striping of the stream across multiple SDO lines + * for sample rates <= 48K. + * + * { ((num_channels * bits_per_sample) / number of SDOs) >= 8 } + * + * Due to legacy design issue it is recommended that above + * ratio must be greater than 8. Since number of SDO lines is + * in powers of 2, next available ratio is 16 which can be + * used as a limiting factor here. + */ + if (of_device_is_compatible(np, "nvidia,tegra194-hda")) + chip->bus.core.sdo_limit = 16; + /* codec detection */ if (!bus->codec_mask) { dev_err(card->dev, "no codecs found!\n"); |