From d12c51d8299667464e31d545acc4ebb7031d024c Mon Sep 17 00:00:00 2001 From: Adrian Knoth Date: Fri, 29 Jul 2011 03:11:03 +0200 Subject: [PATCH] ALSA: hdspm - Fix reported external sample rate on RME MADI and MADIface In slave mode, the card can only detect the base frequency (32..48kHz) on the MADI link (exception: 96k frames), so the real external sample rate is this base frequency multiplied by 1, 2 or 4 depending on the speed mode. This patch enables 64..192kHz sample rates in clock slave mode, which failed before due to an alleged sample rate mismatch between the MADI link (e.g., 48kHz) and the application in DS/QS mode (e.g., 96kHz, 192kHz). Signed-off-by: Adrian Knoth Signed-off-by: Takashi Iwai --- sound/pci/rme9652/hdspm.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c index d21964994168..88ae27431cb2 100644 --- a/sound/pci/rme9652/hdspm.c +++ b/sound/pci/rme9652/hdspm.c @@ -1217,6 +1217,22 @@ static int hdspm_external_sample_rate(struct hdspm *hdspm) rate = 0; break; } + + /* QS and DS rates normally can not be detected + * automatically by the card. Only exception is MADI + * in 96k frame mode. + * + * So if we read SS values (32 .. 48k), check for + * user-provided DS/QS bits in the control register + * and multiply the base frequency accordingly. + */ + if (rate <= 48000) { + if (hdspm->control_register & HDSPM_QuadSpeed) + rate *= 4; + else if (hdspm->control_register & + HDSPM_DoubleSpeed) + rate *= 2; + } } break; } -- 2.20.1