Commit 20dc24a9 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: wm8994: Implement FLL bypass support 



Later WM8994 class devices can bypass the FLL from BCLK. Do this
automatically when the FLL input and output frequencies match up.

Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent 34ff0f95

sound/soc/codecs/wm8994.c

+19 −0
Original line number Diff line number Diff line
@@ -1977,6 +1977,14 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src, 
	snd_soc_update_bits(codec, WM8994_FLL1_CONTROL_1 + reg_offset,

			    WM8994_FLL1_ENA, 0);



	if (wm8994->fll_byp && src == WM8994_FLL_SRC_BCLK &&

	    freq_in == freq_out) {

		dev_dbg(codec->dev, "Bypassing FLL%d\n", id + 1);

		snd_soc_update_bits(codec, WM8994_FLL1_CONTROL_5 + reg_offset,

				    WM8958_FLL1_BYP, WM8958_FLL1_BYP);

		goto out;

	}



	reg = (fll.outdiv << WM8994_FLL1_OUTDIV_SHIFT) |

		(fll.fll_fratio << WM8994_FLL1_FRATIO_SHIFT);

	snd_soc_update_bits(codec, WM8994_FLL1_CONTROL_2 + reg_offset,
@@ -1991,6 +1999,7 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src, 
				    fll.n << WM8994_FLL1_N_SHIFT);



	snd_soc_update_bits(codec, WM8994_FLL1_CONTROL_5 + reg_offset,

			    WM8958_FLL1_BYP |

			    WM8994_FLL1_REFCLK_DIV_MASK |

			    WM8994_FLL1_REFCLK_SRC_MASK,

			    (fll.clk_ref_div << WM8994_FLL1_REFCLK_DIV_SHIFT) |
@@ -2053,6 +2062,7 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src, 
		}

	}



out:

	wm8994->fll[id].in = freq_in;

	wm8994->fll[id].out = freq_out;

	wm8994->fll[id].src = src;
@@ -3579,6 +3589,14 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec) 
	case WM8958:

		wm8994->hubs.dcs_readback_mode = 1;

		wm8994->hubs.hp_startup_mode = 1;



		switch (wm8994->revision) {

		case 0:

			break;

		default:

			wm8994->fll_byp = true;

			break;

		}

		break;



	case WM1811:
@@ -3586,6 +3604,7 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec) 
		wm8994->hubs.no_series_update = 1;

		wm8994->hubs.hp_startup_mode = 1;

		wm8994->hubs.no_cache_class_w = true;

		wm8994->fll_byp = true;



		switch (wm8994->revision) {

		case 0:

sound/soc/codecs/wm8994.h

+1 −0
Original line number Diff line number Diff line
@@ -79,6 +79,7 @@ struct wm8994_priv { 
	struct wm8994_fll_config fll[2], fll_suspend[2];

	struct completion fll_locked[2];

	bool fll_locked_irq;

	bool fll_byp;



	int vmid_refcount;

	int active_refcount;

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