[ALSA] intel8x0 - Add support of 8 channel sound

Added the support of 8 channel sound for codecs that are known to work.
So far, only ALC850 is marked as a 8ch-support codec.

This fix is a modified version of the patch on ALSA BTS#2097 by
Martin Ellis:
	https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2097

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 25 insertions, 3 deletions

diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index c52abd0bf22e..07782ba9c74d 100644
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -155,7 +155,8 @@ DEFINE_REGSET(SP, 0x60);	/* SPDIF out */
 #define   ICH_PCM_SPDIF_69      0x80000000      /* s/pdif pcm on slots 6&9 */
 #define   ICH_PCM_SPDIF_1011    0xc0000000      /* s/pdif pcm on slots 10&11 */
 #define   ICH_PCM_20BIT         0x00400000      /* 20-bit samples (ICH4) */
-#define   ICH_PCM_246_MASK      0x00300000      /* 6 channels (not all chips) */
+#define   ICH_PCM_246_MASK      0x00300000      /* chan mask (not all chips) */
+#define   ICH_PCM_8             0x00300000      /* 8 channels (not all chips) */
 #define   ICH_PCM_6             0x00200000      /* 6 channels (not all chips) */
 #define   ICH_PCM_4             0x00100000      /* 4 channels (not all chips) */
 #define   ICH_PCM_2             0x00000000      /* 2 channels (stereo) */
@@ -382,6 +383,7 @@ struct intel8x0 {
 
         unsigned multi4: 1,
                  multi6: 1,
+                 multi8 :1,
                  dra: 1,
                  smp20bit: 1;
         unsigned in_ac97_init: 1,
@@ -997,6 +999,8 @@ static void snd_intel8x0_setup_pcm_out(struct intel8x0 *chip,
                         cnt |= ICH_PCM_4;
                 else if (runtime->channels == 6)
                         cnt |= ICH_PCM_6;
+                else if (runtime->channels == 8)
+                        cnt |= ICH_PCM_8;
                 if (chip->device_type == DEVICE_NFORCE) {
                         /* reset to 2ch once to keep the 6 channel data in alignment,
                          * to start from Front Left always
@@ -1106,6 +1110,16 @@ static struct snd_pcm_hw_constraint_list hw_constraints_channels6 = {
         .mask = 0,
 };
 
+static unsigned int channels8[] = {
+        2, 4, 6, 8,
+};
+
+static struct snd_pcm_hw_constraint_list hw_constraints_channels8 = {
+        .count = ARRAY_SIZE(channels8),
+        .list = channels8,
+        .mask = 0,
+};
+
 static int snd_intel8x0_pcm_open(struct snd_pcm_substream *substream, struct ichdev *ichdev)
 {
         struct intel8x0 *chip = snd_pcm_substream_chip(substream);
@@ -1136,7 +1150,12 @@ static int snd_intel8x0_playback_open(struct snd_pcm_substream *substream)
         if (err < 0)
                 return err;
 
-        if (chip->multi6) {
+        if (chip->multi8) {
+                runtime->hw.channels_max = 8;
+                snd_pcm_hw_constraint_list(runtime, 0,
+                                                SNDRV_PCM_HW_PARAM_CHANNELS,
+                                                &hw_constraints_channels8);
+        } else if (chip->multi6) {
                 runtime->hw.channels_max = 6;
                 snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
                                            &hw_constraints_channels6);
@@ -2203,8 +2222,11 @@ static int __devinit snd_intel8x0_mixer(struct intel8x0 *chip, int ac97_clock,
         }
         if (pbus->pcms[0].r[0].slots & (1 << AC97_SLOT_PCM_SLEFT)) {
                 chip->multi4 = 1;
-                if (pbus->pcms[0].r[0].slots & (1 << AC97_SLOT_LFE))
+                if (pbus->pcms[0].r[0].slots & (1 << AC97_SLOT_LFE)) {
                         chip->multi6 = 1;
+                        if (chip->ac97[0]->flags & AC97_HAS_8CH)
+                                chip->multi8 = 1;
+                }
         }
         if (pbus->pcms[0].r[1].rslots[0]) {
                 chip->dra = 1;