[PATCH] ALSA: ctxfi: Add fallback to default RSR for S/PDIF

Harin Lee
2026-04-06T07:49:27Z

spdif_passthru_playback_get_resources() uses atc->pll_rate as the RSR
for the MSR calculation loop. However, pll_rate is only updated in
atc_pll_init() and not in hw_pll_init(), so it remains 0 after the
card init.

When spdif_passthru_playback_setup() skips atc_pll_init() for
32000 Hz, (rsr * desc.msr) always becomes 0, causing the loop to spin
indefinitely.

Add fallback to use atc->rsr when atc->pll_rate is 0. This reflects
the hardware state, since hw_card_init() already configures the PLL
to the default RSR.

Fixes: 8cc72361481f ("ALSA: SB X-Fi driver merge")
Cc: stable@vger.kernel.org
Signed-off-by: Harin Lee <me@harin.net>
---
sound/pci/ctxfi/ctatc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/pci/ctxfi/ctatc.c b/sound/pci/ctxfi/ctatc.c
index 516c0a12ed9f..02fe09330939 100644
--- a/sound/pci/ctxfi/ctatc.c
+++ b/sound/pci/ctxfi/ctatc.c
@@ -794,7 +794,8 @@ static int spdif_passthru_playback_get_resources(struct ct_atc *atc,
struct src *src;
int err;
int n_amixer = apcm->substream->runtime->channels, i;
- unsigned int pitch, rsr = atc->pll_rate;
+ unsigned int pitch;
+ unsigned int rsr = atc->pll_rate ? atc->pll_rate : atc->rsr;

/* first release old resources */
atc_pcm_release_resources(atc, apcm);
--
2.53.0