From: Daniel Baluta <daniel.baluta@nxp.com> To: <alsa-devel@alsa-project.org> Cc: <lgirdwood@gmail.com>, <broonie@kernel.org>, <perex@perex.cz>, <tiwai@suse.com>, <linux-kernel@vger.kernel.org>, <patches@opensource.wolfsonmicro.com>, <ckeepax@opensource.wolfsonmicro.com>, <shengjiu.wang@nxp.com>, <viorel.suman@nxp.com>, <mihai.serban@nxp.com> Subject: [PATCH v2 1/2] ASoC: codec: wm9860: Refactor PLL out freq search Date: Wed, 5 Apr 2017 16:26:37 +0300 [thread overview] Message-ID: <1491398798-27829-2-git-send-email-daniel.baluta@nxp.com> (raw) In-Reply-To: <1491398798-27829-1-git-send-email-daniel.baluta@nxp.com> Add a separate function for deriving (sysclk, lrclk, bclk) when the clock is auto or pll. Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> --- sound/soc/codecs/wm8960.c | 97 +++++++++++++++++++++++++++++++++-------------- 1 file changed, 68 insertions(+), 29 deletions(-) diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index ce159f1..1c973f0 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -672,10 +672,74 @@ int wm8960_configure_sysclk(struct wm8960_priv *wm8960, int mclk, return *bclk_idx; } +/** + * wm8960_configure_pll - checks if there is a PLL out frequency available + * The PLL out frequency must be chosen such that: + * - sysclk = lrclk * dac_divs + * - freq_out = sysclk * sysclk_divs + * - 10 * sysclk = bclk * bclk_divs + * + * @codec: codec structure + * @freq_in: input frequency used to derive freq out via PLL + * @sysclk_idx: sysclk_divs index for found sysclk + * @dac_idx: dac_divs index for found lrclk + * @bclk_idx: bclk_divs index for found bclk + * + * Returns: + * -1, in case no PLL frequency out available was found + * >=0, in case we could derive bclk, lrclk, sysclk from PLL out using + * (@sysclk_idx, @dac_idx, @bclk_idx) dividers + */ +static +int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in, + int *sysclk_idx, int *dac_idx, int *bclk_idx) +{ + struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec); + int sysclk, bclk, lrclk, freq_out; + int diff, best_freq_out = 0; + int i, j, k; + + bclk = wm8960->bclk; + lrclk = wm8960->lrclk; + + *bclk_idx = *dac_idx = *sysclk_idx = -1; + + for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) { + if (sysclk_divs[i] == -1) + continue; + for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) { + sysclk = lrclk * dac_divs[j]; + freq_out = sysclk * sysclk_divs[i]; + + for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k) { + if (!is_pll_freq_available(freq_in, freq_out)) + continue; + + diff = sysclk - bclk * bclk_divs[k] / 10; + if (diff == 0) { + *sysclk_idx = i; + *dac_idx = j; + *bclk_idx = k; + best_freq_out = freq_out; + break; + } + } + if (k != ARRAY_SIZE(bclk_divs)) + break; + } + if (j != ARRAY_SIZE(dac_divs)) + break; + } + + if (*bclk_idx != -1) + wm8960_set_pll(codec, freq_in, best_freq_out); + + return *bclk_idx; +} static int wm8960_configure_clocking(struct snd_soc_codec *codec) { struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec); - int sysclk, bclk, lrclk, freq_out, freq_in; + int freq_out, freq_in; u16 iface1 = snd_soc_read(codec, WM8960_IFACE1); int i, j, k; int ret; @@ -692,8 +756,6 @@ static int wm8960_configure_clocking(struct snd_soc_codec *codec) } freq_in = wm8960->freq_in; - bclk = wm8960->bclk; - lrclk = wm8960->lrclk; /* * If it's sysclk auto mode, check if the MCLK can provide sysclk or * not. If MCLK can provide sysclk, using MCLK to provide sysclk @@ -720,33 +782,10 @@ static int wm8960_configure_clocking(struct snd_soc_codec *codec) return -EINVAL; } } - /* get a available pll out frequency and set pll */ - for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) { - if (sysclk_divs[i] == -1) - continue; - for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) { - sysclk = lrclk * dac_divs[j]; - freq_out = sysclk * sysclk_divs[i]; - - for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k) { - if (sysclk == bclk * bclk_divs[k] / 10 && - is_pll_freq_available(freq_in, freq_out)) { - wm8960_set_pll(codec, - freq_in, freq_out); - break; - } else { - continue; - } - } - if (k != ARRAY_SIZE(bclk_divs)) - break; - } - if (j != ARRAY_SIZE(dac_divs)) - break; - } - if (i == ARRAY_SIZE(sysclk_divs)) { - dev_err(codec->dev, "failed to configure clock\n"); + ret = wm8960_configure_pll(codec, freq_in, &i, &j, &k); + if (ret < 0) { + dev_err(codec->dev, "failed to configure clock via PLL\n"); return -EINVAL; } -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Baluta <daniel.baluta@nxp.com> To: alsa-devel@alsa-project.org Cc: lgirdwood@gmail.com, shengjiu.wang@nxp.com, patches@opensource.wolfsonmicro.com, linux-kernel@vger.kernel.org, tiwai@suse.com, broonie@kernel.org, viorel.suman@nxp.com, mihai.serban@nxp.com, ckeepax@opensource.wolfsonmicro.com Subject: [PATCH v2 1/2] ASoC: codec: wm9860: Refactor PLL out freq search Date: Wed, 5 Apr 2017 16:26:37 +0300 [thread overview] Message-ID: <1491398798-27829-2-git-send-email-daniel.baluta@nxp.com> (raw) In-Reply-To: <1491398798-27829-1-git-send-email-daniel.baluta@nxp.com> Add a separate function for deriving (sysclk, lrclk, bclk) when the clock is auto or pll. Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> --- sound/soc/codecs/wm8960.c | 97 +++++++++++++++++++++++++++++++++-------------- 1 file changed, 68 insertions(+), 29 deletions(-) diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index ce159f1..1c973f0 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -672,10 +672,74 @@ int wm8960_configure_sysclk(struct wm8960_priv *wm8960, int mclk, return *bclk_idx; } +/** + * wm8960_configure_pll - checks if there is a PLL out frequency available + * The PLL out frequency must be chosen such that: + * - sysclk = lrclk * dac_divs + * - freq_out = sysclk * sysclk_divs + * - 10 * sysclk = bclk * bclk_divs + * + * @codec: codec structure + * @freq_in: input frequency used to derive freq out via PLL + * @sysclk_idx: sysclk_divs index for found sysclk + * @dac_idx: dac_divs index for found lrclk + * @bclk_idx: bclk_divs index for found bclk + * + * Returns: + * -1, in case no PLL frequency out available was found + * >=0, in case we could derive bclk, lrclk, sysclk from PLL out using + * (@sysclk_idx, @dac_idx, @bclk_idx) dividers + */ +static +int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in, + int *sysclk_idx, int *dac_idx, int *bclk_idx) +{ + struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec); + int sysclk, bclk, lrclk, freq_out; + int diff, best_freq_out = 0; + int i, j, k; + + bclk = wm8960->bclk; + lrclk = wm8960->lrclk; + + *bclk_idx = *dac_idx = *sysclk_idx = -1; + + for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) { + if (sysclk_divs[i] == -1) + continue; + for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) { + sysclk = lrclk * dac_divs[j]; + freq_out = sysclk * sysclk_divs[i]; + + for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k) { + if (!is_pll_freq_available(freq_in, freq_out)) + continue; + + diff = sysclk - bclk * bclk_divs[k] / 10; + if (diff == 0) { + *sysclk_idx = i; + *dac_idx = j; + *bclk_idx = k; + best_freq_out = freq_out; + break; + } + } + if (k != ARRAY_SIZE(bclk_divs)) + break; + } + if (j != ARRAY_SIZE(dac_divs)) + break; + } + + if (*bclk_idx != -1) + wm8960_set_pll(codec, freq_in, best_freq_out); + + return *bclk_idx; +} static int wm8960_configure_clocking(struct snd_soc_codec *codec) { struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec); - int sysclk, bclk, lrclk, freq_out, freq_in; + int freq_out, freq_in; u16 iface1 = snd_soc_read(codec, WM8960_IFACE1); int i, j, k; int ret; @@ -692,8 +756,6 @@ static int wm8960_configure_clocking(struct snd_soc_codec *codec) } freq_in = wm8960->freq_in; - bclk = wm8960->bclk; - lrclk = wm8960->lrclk; /* * If it's sysclk auto mode, check if the MCLK can provide sysclk or * not. If MCLK can provide sysclk, using MCLK to provide sysclk @@ -720,33 +782,10 @@ static int wm8960_configure_clocking(struct snd_soc_codec *codec) return -EINVAL; } } - /* get a available pll out frequency and set pll */ - for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) { - if (sysclk_divs[i] == -1) - continue; - for (j = 0; j < ARRAY_SIZE(dac_divs); ++j) { - sysclk = lrclk * dac_divs[j]; - freq_out = sysclk * sysclk_divs[i]; - - for (k = 0; k < ARRAY_SIZE(bclk_divs); ++k) { - if (sysclk == bclk * bclk_divs[k] / 10 && - is_pll_freq_available(freq_in, freq_out)) { - wm8960_set_pll(codec, - freq_in, freq_out); - break; - } else { - continue; - } - } - if (k != ARRAY_SIZE(bclk_divs)) - break; - } - if (j != ARRAY_SIZE(dac_divs)) - break; - } - if (i == ARRAY_SIZE(sysclk_divs)) { - dev_err(codec->dev, "failed to configure clock\n"); + ret = wm8960_configure_pll(codec, freq_in, &i, &j, &k); + if (ret < 0) { + dev_err(codec->dev, "failed to configure clock via PLL\n"); return -EINVAL; } -- 2.7.4
next prev parent reply other threads:[~2017-04-05 13:27 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-05 13:26 [PATCH v2 0/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL Daniel Baluta 2017-04-05 13:26 ` Daniel Baluta 2017-04-05 13:26 ` Daniel Baluta [this message] 2017-04-05 13:26 ` [PATCH v2 1/2] ASoC: codec: wm9860: Refactor PLL out freq search Daniel Baluta 2017-04-05 13:26 ` [PATCH v2 2/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL Daniel Baluta 2017-04-05 13:26 ` Daniel Baluta
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