ALSA: hda - show EPSS capability in proc

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 31 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index f465cff28041..09476fc1ab64 100644
--- a/sound/pci/hda/hda_proc.c
+++ b/sound/pci/hda/hda_proc.c
@@ -26,6 +26,21 @@
 #include "hda_codec.h"
 #include "hda_local.h"
 
+static char *bits_names(unsigned int bits, char *names[], int size)
+{
+        int i, n;
+        static char buf[128];
+
+        for (i = 0, n = 0; i < size; i++) {
+                if (bits & (1U<<i) && names[i])
+                        n += snprintf(buf + n, sizeof(buf) - n, " %s",
+                                      names[i]);
+        }
+        buf[n] = '\0';
+
+        return buf;
+}
+
 static const char *get_wid_type_name(unsigned int wid_value)
 {
         static char *names[16] = {
@@ -398,8 +413,24 @@ static const char *get_pwr_state(u32 state)
 static void print_power_state(struct snd_info_buffer *buffer,
                               struct hda_codec *codec, hda_nid_t nid)
 {
+        static char *names[] = {
+                [ilog2(AC_PWRST_D0SUP)]         = "D0",
+                [ilog2(AC_PWRST_D1SUP)]         = "D1",
+                [ilog2(AC_PWRST_D2SUP)]         = "D2",
+                [ilog2(AC_PWRST_D3SUP)]         = "D3",
+                [ilog2(AC_PWRST_D3COLDSUP)]     = "D3cold",
+                [ilog2(AC_PWRST_S3D3COLDSUP)]   = "S3D3cold",
+                [ilog2(AC_PWRST_CLKSTOP)]       = "CLKSTOP",
+                [ilog2(AC_PWRST_EPSS)]          = "EPSS",
+        };
+
+        int sup = snd_hda_param_read(codec, nid, AC_PAR_POWER_STATE);
         int pwr = snd_hda_codec_read(codec, nid, 0,
                                      AC_VERB_GET_POWER_STATE, 0);
+        if (sup)
+                snd_iprintf(buffer, "  Power states: %s\n",
+                            bits_names(sup, names, ARRAY_SIZE(names)));
+
         snd_iprintf(buffer, "  Power: setting=%s, actual=%s\n",
                     get_pwr_state(pwr & AC_PWRST_SETTING),
                     get_pwr_state((pwr & AC_PWRST_ACTUAL) >>