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ALSA: hda/tegra: Hardcode GCAP ISS value on T234 

The GCAP register on Tegra234 implies no Input Streams(ISS)
supported, but the HW output stream descriptor programming
should start with offset 0x20*4 from base stream descriptor
address. This will be a problem while calculating the offset
for output stream descriptor which will be considering input
stream also. So here output stream starts with offset 0 which
is wrong as HW register for output stream offset starts with 4.
So hardcode the input stream numbers to 4 to avoid the issue
in offset calculation.

Signed-off-by: Mohan Kumar <mkumard@nvidia.com>
Link: https://lore.kernel.org/r/20220216092240.26464-3-mkumard@nvidia.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Mohan Kumar 2022-02-16 14:52:36 +05:30 committed by Takashi Iwai
parent f43156a956
commit b58d511ded
1 changed files with 12 additions and 0 deletions
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12
sound/pci/hda/hda_tegra.c
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@ -315,6 +315,18 @@ static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev)
* hardcoded value
*/
chip->capture_streams = (gcap >> 8) & 0x0f;
/* The GCAP register on Tegra234 implies no Input Streams(ISS) support,
* but the HW output stream descriptor programming should start with
* offset 0x20*4 from base stream descriptor address. This will be a
* problem while calculating the offset for output stream descriptor
* which will be considering input stream also. So here output stream
* starts with offset 0 which is wrong as HW register for output stream
* offset starts with 4.
*/
if (of_device_is_compatible(np, "nvidia,tegra234-hda"))
chip->capture_streams = 4;
chip->playback_streams = (gcap >> 12) & 0x0f;
if (!chip->playback_streams && !chip->capture_streams) {
/* gcap didn't give any info, switching to old method */