ALSA: emu10k1: query rate of external clock sources on E-MU cards

The value isn't used yet; the subsequent commits will do that.

This ignores the existence of rates above 48 kHz, which is fine, as the
hardware will just switch to the fallback clock source when fed with a
rate which is incompatible with the base clock multiplier, which
currently is always x1.

The sample rate display in /proc spdif-in is adjusted to reflect our
understanding of the input rates.

This is tested only with an 0404b card without sync card, so there is a
lot of room for improvement.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>

Link: https://lore.kernel.org/r/20230612191325.1315854-4-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 23 insertions, 20 deletions

diff --git a/sound/pci/emu10k1/emuproc.c b/sound/pci/emu10k1/emuproc.c
index ca7b4dddbea8..993b35362499 100644
--- a/sound/pci/emu10k1/emuproc.c
+++ b/sound/pci/emu10k1/emuproc.c
@@ -168,29 +168,32 @@ static void snd_emu10k1_proc_spdif_read(struct snd_info_entry *entry,
 	struct snd_emu10k1 *emu = entry->private_data;
 	u32 value;
 	u32 value2;
-	u32 rate;
 
 	if (emu->card_capabilities->emu_model) {
-		if (!emu->card_capabilities->no_adat) {
-			snd_emu1010_fpga_read(emu, 0x38, &value);
-			if ((value & 0x1) == 0) {
-				snd_emu1010_fpga_read(emu, 0x2a, &value);
-				snd_emu1010_fpga_read(emu, 0x2b, &value2);
-				rate = 0x1770000 / (((value << 5) | value2)+1);
-				snd_iprintf(buffer, "ADAT Locked : %u\n", rate);
-			} else {
-				snd_iprintf(buffer, "ADAT Unlocked\n");
-			}
-		}
-		snd_emu1010_fpga_read(emu, 0x20, &value);
-		if ((value & 0x4) == 0) {
-			snd_emu1010_fpga_read(emu, 0x28, &value);
-			snd_emu1010_fpga_read(emu, 0x29, &value2);
-			rate = 0x1770000 / (((value << 5) | value2)+1);	
-			snd_iprintf(buffer, "SPDIF Locked : %d\n", rate);
-		} else {
-			snd_iprintf(buffer, "SPDIF Unlocked\n");
+		// This represents the S/PDIF lock status on 0404b, which is
+		// kinda weird and unhelpful, because monitoring it via IRQ is
+		// impractical (one gets an IRQ flood as long as it is desynced).
+		snd_emu1010_fpga_read(emu, EMU_HANA_IRQ_STATUS, &value);
+		snd_iprintf(buffer, "Lock status 1: %#x\n", value & 0x10);
+
+		// Bit 0x1 in LO being 0 is supposedly for ADAT lock.
+		// The registers are always all zero on 0404b.
+		snd_emu1010_fpga_read(emu, EMU_HANA_LOCK_STS_LO, &value);
+		snd_emu1010_fpga_read(emu, EMU_HANA_LOCK_STS_HI, &value2);
+		snd_iprintf(buffer, "Lock status 2: %#x %#x\n", value, value2);
+
+		snd_iprintf(buffer, "S/PDIF rate: %dHz\n",
+			    snd_emu1010_get_raw_rate(emu, EMU_HANA_WCLOCK_HANA_SPDIF_IN));
+		if (emu->card_capabilities->emu_model != EMU_MODEL_EMU0404) {
+			snd_iprintf(buffer, "ADAT rate: %dHz\n",
+				    snd_emu1010_get_raw_rate(emu, EMU_HANA_WCLOCK_HANA_ADAT_IN));
+			snd_iprintf(buffer, "Dock rate: %dHz\n",
+				    snd_emu1010_get_raw_rate(emu, EMU_HANA_WCLOCK_2ND_HANA));
 		}
+		if (emu->card_capabilities->emu_model == EMU_MODEL_EMU0404 ||
+		    emu->card_capabilities->emu_model == EMU_MODEL_EMU1010)
+			snd_iprintf(buffer, "BNC rate: %dHz\n",
+				    snd_emu1010_get_raw_rate(emu, EMU_HANA_WCLOCK_SYNC_BNC));
 	} else {
 		snd_emu10k1_proc_spdif_status(emu, buffer, "CD-ROM S/PDIF In", CDCS, CDSRCS);
 		snd_emu10k1_proc_spdif_status(emu, buffer, "Optical or Coax S/PDIF In", GPSCS, GPSRCS);