ALSA: hda/realtek - Avoid setting wrong COEF on ALC269 & co

ALC269 & co have many vendor-specific setups with COEF verbs.
However, some verbs seem specific to some codec versions and they
result in the codec stalling.  Typically, such a case can be avoided
by checking the return value from reading a COEF.  If the return value
is -1, it implies that the COEF is invalid, thus it shouldn't be
written.

This patch adds the invalid COEF checks in appropriate places
accessing ALC269 and its variants.  The patch actually fixes the
resume problem on Acer AO725 laptop.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=52181
Tested-by: Francesco Muzio <muziofg@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 6b38ec3c6e575bd2ee219630ad74412ba434f3b3..b32ce086d2e0e9544f4d382da2f84bd1dd8caae7 100644 (file)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -181,6 +181,8 @@ static void alc_fix_pll(struct hda_codec *codec)
                            spec->pll_coef_idx);
        val = snd_hda_codec_read(codec, spec->pll_nid, 0,
                                 AC_VERB_GET_PROC_COEF, 0);
+       if (val == -1)
+               return;
        snd_hda_codec_write(codec, spec->pll_nid, 0, AC_VERB_SET_COEF_INDEX,
                            spec->pll_coef_idx);
        snd_hda_codec_write(codec, spec->pll_nid, 0, AC_VERB_SET_PROC_COEF,
@@ -2806,6 +2808,8 @@ static void alc286_shutup(struct hda_codec *codec)
 static void alc269vb_toggle_power_output(struct hda_codec *codec, int power_up)
 {
        int val = alc_read_coef_idx(codec, 0x04);
+       if (val == -1)
+               return;
        if (power_up)
                val |= 1 << 11;
        else
@@ -5311,27 +5315,30 @@ static void alc269_fill_coef(struct hda_codec *codec)
        if ((alc_get_coef0(codec) & 0x00ff) == 0x017) {
                val = alc_read_coef_idx(codec, 0x04);
                /* Power up output pin */
-               alc_write_coef_idx(codec, 0x04, val | (1<<11));
+               if (val != -1)
+                       alc_write_coef_idx(codec, 0x04, val | (1<<11));
        }
 
        if ((alc_get_coef0(codec) & 0x00ff) == 0x018) {
                val = alc_read_coef_idx(codec, 0xd);
-               if ((val & 0x0c00) >> 10 != 0x1) {
+               if (val != -1 && (val & 0x0c00) >> 10 != 0x1) {
                        /* Capless ramp up clock control */
                        alc_write_coef_idx(codec, 0xd, val | (1<<10));
                }
                val = alc_read_coef_idx(codec, 0x17);
-               if ((val & 0x01c0) >> 6 != 0x4) {
+               if (val != -1 && (val & 0x01c0) >> 6 != 0x4) {
                        /* Class D power on reset */
                        alc_write_coef_idx(codec, 0x17, val | (1<<7));
                }
        }
 
        val = alc_read_coef_idx(codec, 0xd); /* Class D */
-       alc_write_coef_idx(codec, 0xd, val | (1<<14));
+       if (val != -1)
+               alc_write_coef_idx(codec, 0xd, val | (1<<14));
 
        val = alc_read_coef_idx(codec, 0x4); /* HP */
-       alc_write_coef_idx(codec, 0x4, val | (1<<11));
+       if (val != -1)
+               alc_write_coef_idx(codec, 0x4, val | (1<<11));
 }
 
 /*