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-rw-r--r--sound/pci/rme9652/hdspm.c28
1 files changed, 23 insertions, 5 deletions
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 159133a14464..1a52a1ae1f4c 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -1241,10 +1241,30 @@ static int hdspm_external_sample_rate(struct hdspm *hdspm)
return rate;
}
+/* return latency in samples per period */
+static int hdspm_get_latency(struct hdspm *hdspm)
+{
+ int n;
+
+ n = hdspm_decode_latency(hdspm->control_register);
+
+ /* Special case for new RME cards with 32 samples period size.
+ * The three latency bits in the control register
+ * (HDSP_LatencyMask) encode latency values of 64 samples as
+ * 0, 128 samples as 1 ... 4096 samples as 6. For old cards, 7
+ * denotes 8192 samples, but on new cards like RayDAT or AIO,
+ * it corresponds to 32 samples.
+ */
+ if ((7 == n) && (RayDAT == hdspm->io_type || AIO == hdspm->io_type))
+ n = -1;
+
+ return 1 << (n + 6);
+}
+
/* Latency function */
static inline void hdspm_compute_period_size(struct hdspm *hdspm)
{
- hdspm->period_bytes = 1 << ((hdspm_decode_latency(hdspm->control_register) + 8));
+ hdspm->period_bytes = 4 * hdspm_get_latency(hdspm);
}
@@ -4801,8 +4821,7 @@ snd_hdspm_proc_read_madi(struct snd_info_entry * entry,
snd_iprintf(buffer, "--- Settings ---\n");
- x = 1 << (6 + hdspm_decode_latency(hdspm->control_register &
- HDSPM_LatencyMask));
+ x = hdspm_get_latency(hdspm);
snd_iprintf(buffer,
"Size (Latency): %d samples (2 periods of %lu bytes)\n",
@@ -4965,8 +4984,7 @@ snd_hdspm_proc_read_aes32(struct snd_info_entry * entry,
snd_iprintf(buffer, "--- Settings ---\n");
- x = 1 << (6 + hdspm_decode_latency(hdspm->control_register &
- HDSPM_LatencyMask));
+ x = hdspm_get_latency(hdspm);
snd_iprintf(buffer,
"Size (Latency): %d samples (2 periods of %lu bytes)\n",
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