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Lines 715-722
ac97_initmixer(struct ac97_info *codec)
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| 715 |
* (ac97 2.3). |
715 |
* (ac97 2.3). |
| 716 |
*/ |
716 |
*/ |
| 717 |
bit = codec->mix[i].bits; |
717 |
bit = codec->mix[i].bits; |
| 718 |
if (bit == 5) |
718 |
if (bit == 5) { |
| 719 |
bit++; |
719 |
/* |
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720 |
* Test for possible 6bit control by |
| 721 |
* turning on 5th (or 13th) and detect |
| 722 |
* possible clamped values on the lower |
| 723 |
* bits, which might be possible for |
| 724 |
* 5bit control. |
| 725 |
* |
| 726 |
* XXX Emulators (QEMU, Virtualbox, |
| 727 |
* etc..) does not reset the |
| 728 |
* high bit, making it looks like |
| 729 |
* a 6bit control. Consider that |
| 730 |
* as "buggy codec". |
| 731 |
*/ |
| 732 |
j = 1 << (5 + codec->mix[i].ofs); |
| 733 |
ac97_wrcd(codec, reg, j); |
| 734 |
k = ac97_rdcd(codec, reg); |
| 735 |
k >>= codec->mix[i].ofs; |
| 736 |
if ((k & 0x1f) != 0x1f) |
| 737 |
bit++; |
| 738 |
} |
| 720 |
j = ((1 << bit) - 1) << codec->mix[i].ofs; |
739 |
j = ((1 << bit) - 1) << codec->mix[i].ofs; |
| 721 |
ac97_wrcd(codec, reg, |
740 |
ac97_wrcd(codec, reg, |
| 722 |
j | (codec->mix[i].mute ? 0x8000 : 0)); |
741 |
j | (codec->mix[i].mute ? 0x8000 : 0)); |