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[3/4] ALSA: emu10k1: don't restrict capture channel count to powers of two

Message ID 20230523200709.236059-4-oswald.buddenhagen@gmx.de
State Accepted
Commit 848ec6cf413d151eaae11ada2953d9078f8bcda9
Headers show
Series ALSA: emu10k1: capture-related improvements | expand

Commit Message

Oswald Buddenhagen May 23, 2023, 8:07 p.m. UTC
The hardware can deal with primes up to 7 and power-of-two multiples
thereof; the limitation is reflected by the possible buffer sizes.

Note that setting the voice mask will not allow more than 16 channels
even on Sound Blaster Audigy anymore, as 32 seems a bit excessive (the
code overall appears to think so, just not in this case).

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
---
 sound/pci/emu10k1/emupcm.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)
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Patch

diff --git a/sound/pci/emu10k1/emupcm.c b/sound/pci/emu10k1/emupcm.c
index fd3fc96c08e9..ac10b53525fd 100644
--- a/sound/pci/emu10k1/emupcm.c
+++ b/sound/pci/emu10k1/emupcm.c
@@ -122,6 +122,17 @@  static int snd_emu10k1_pcm_channel_alloc(struct snd_emu10k1_pcm *epcm,
 	return 0;
 }
 
+// Primes 2-7 and 2^n multiples thereof, up to 16.
+static const unsigned int efx_capture_channels[] = {
+	1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16
+};
+
+static const struct snd_pcm_hw_constraint_list hw_constraints_efx_capture_channels = {
+	.count = ARRAY_SIZE(efx_capture_channels),
+	.list = efx_capture_channels,
+	.mask = 0
+};
+
 static const unsigned int capture_buffer_sizes[31] = {
 	384,	448,	512,	640,
 	384*2,	448*2,	512*2,	640*2,
@@ -1216,7 +1227,7 @@  static int snd_emu10k1_capture_efx_open(struct snd_pcm_substream *substream)
 	struct snd_emu10k1_pcm *epcm;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int nefx = emu->audigy ? 64 : 32;
-	int idx;
+	int idx, err;
 
 	epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
 	if (epcm == NULL)
@@ -1302,6 +1313,12 @@  static int snd_emu10k1_capture_efx_open(struct snd_pcm_substream *substream)
 	epcm->capture_cr_val = emu->efx_voices_mask[0];
 	epcm->capture_cr_val2 = emu->efx_voices_mask[1];
 	spin_unlock_irq(&emu->reg_lock);
+	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+					 &hw_constraints_efx_capture_channels);
+	if (err < 0) {
+		kfree(epcm);
+		return err;
+	}
 	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 				   &hw_constraints_capture_buffer_sizes);
 	emu->capture_efx_interrupt = snd_emu10k1_pcm_efx_interrupt;
@@ -1466,22 +1483,16 @@  static int snd_emu10k1_pcm_efx_voices_mask_put(struct snd_kcontrol *kcontrol, st
 	struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 	unsigned int nval[2], bits;
 	int nefx = emu->audigy ? 64 : 32;
-	int nefxb = emu->audigy ? 7 : 6;
 	int change, idx;
 	
 	nval[0] = nval[1] = 0;
 	for (idx = 0, bits = 0; idx < nefx; idx++)
 		if (ucontrol->value.integer.value[idx]) {
 			nval[idx / 32] |= 1 << (idx % 32);
 			bits++;
 		}
 
-	// Check that the number of requested channels is a power of two
-	// not bigger than the number of available channels.
-	for (idx = 0; idx < nefxb; idx++)
-		if (1 << idx == bits)
-			break;
-	if (idx >= nefxb)
+	if (bits == 9 || bits == 11 || bits == 13 || bits == 15 || bits > 16)
 		return -EINVAL;
 
 	spin_lock_irq(&emu->reg_lock);