[ALSA] ac97 - Add support of static resolution tables

Modules: AC97 Codec

Added the support of static resolution table support for codecs
that the driver cannot probe the volume resolution properly.

The table pointer should be set in each codec patch.

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

1 files changed, 12 insertions, 0 deletions

diff --git a/sound/pci/ac97/ac97_codec.c b/sound/pci/ac97/ac97_codec.c
index 6108cdc5efb6..124c1bc4cb92 100644
--- a/sound/pci/ac97/ac97_codec.c
+++ b/sound/pci/ac97/ac97_codec.c
@@ -1030,6 +1030,18 @@ static void check_volume_resolution(struct snd_ac97 *ac97, int reg, unsigned cha
         unsigned char max[3] = { 63, 31, 15 };
         int i;
 
+        /* first look up the static resolution table */
+        if (ac97->res_table) {
+                const struct snd_ac97_res_table *tbl;
+                for (tbl = ac97->res_table; tbl->reg; tbl++) {
+                        if (tbl->reg == reg) {
+                                *lo_max = tbl->bits & 0xff;
+                                *hi_max = (tbl->bits >> 8) & 0xff;
+                                return;
+                        }
+                }
+        }
+
         *lo_max = *hi_max = 0;
         for (i = 0 ; i < ARRAY_SIZE(cbit); i++) {
                 unsigned short val;