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 2/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL Date: Tue, 4 Apr 2017 19:45:14 +0300 [thread overview] Message-ID: <1491324314-27067-3-git-send-email-daniel.baluta@nxp.com> (raw) In-Reply-To: <1491324314-27067-1-git-send-email-daniel.baluta@nxp.com> Bitclk is derived from sysclk using bclk_divs. Sysclk can be derived in two ways: (1) directly from MLCK (2) MCLK via PLL Commit 3c01b9ee2ab9d0d ("ASoC: codec: wm8960: Relax bit clock computation") relaxed bitclk computation when sysclk is directly derived from MCLK. Lets do the same thing when sysclk is derived via PLL. Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> --- sound/soc/codecs/wm8960.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index 36c8454..e8cb764 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -679,6 +679,10 @@ int wm8960_configure_sysclk(struct wm8960_priv *wm8960, int mclk, * - freq_out = sysclk * sysclk_divs * - 10 * sysclk = bclk * bclk_divs * + * If we cannot find an exact match for (sysclk, lrclk, bclk) + * triplet, we relax the bclk such that bclk is chosen as the + * closest available frequency greater than expected bclk. + * * @codec: codec structure * @freq_in: input frequency used to derive freq out via PLL * @sysclk_idx: sysclk_divs index for found sysclk @@ -696,11 +700,12 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in, { struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec); int sysclk, bclk, lrclk, freq_out; - int diff, best_freq_out; + int diff, closest, best_freq_out; int i, j, k; bclk = wm8960->bclk; lrclk = wm8960->lrclk; + closest = freq_in; *bclk_idx = -1; @@ -723,6 +728,13 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in, best_freq_out = freq_out; break; } + if (diff > 0 && closest > diff) { + *sysclk_idx = i; + *dac_idx = j; + *bclk_idx = k; + closest = diff; + best_freq_out = freq_out; + } } } } -- 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, 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 2/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL Date: Tue, 4 Apr 2017 19:45:14 +0300 [thread overview] Message-ID: <1491324314-27067-3-git-send-email-daniel.baluta@nxp.com> (raw) In-Reply-To: <1491324314-27067-1-git-send-email-daniel.baluta@nxp.com> Bitclk is derived from sysclk using bclk_divs. Sysclk can be derived in two ways: (1) directly from MLCK (2) MCLK via PLL Commit 3c01b9ee2ab9d0d ("ASoC: codec: wm8960: Relax bit clock computation") relaxed bitclk computation when sysclk is directly derived from MCLK. Lets do the same thing when sysclk is derived via PLL. Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> --- sound/soc/codecs/wm8960.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c index 36c8454..e8cb764 100644 --- a/sound/soc/codecs/wm8960.c +++ b/sound/soc/codecs/wm8960.c @@ -679,6 +679,10 @@ int wm8960_configure_sysclk(struct wm8960_priv *wm8960, int mclk, * - freq_out = sysclk * sysclk_divs * - 10 * sysclk = bclk * bclk_divs * + * If we cannot find an exact match for (sysclk, lrclk, bclk) + * triplet, we relax the bclk such that bclk is chosen as the + * closest available frequency greater than expected bclk. + * * @codec: codec structure * @freq_in: input frequency used to derive freq out via PLL * @sysclk_idx: sysclk_divs index for found sysclk @@ -696,11 +700,12 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in, { struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec); int sysclk, bclk, lrclk, freq_out; - int diff, best_freq_out; + int diff, closest, best_freq_out; int i, j, k; bclk = wm8960->bclk; lrclk = wm8960->lrclk; + closest = freq_in; *bclk_idx = -1; @@ -723,6 +728,13 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in, best_freq_out = freq_out; break; } + if (diff > 0 && closest > diff) { + *sysclk_idx = i; + *dac_idx = j; + *bclk_idx = k; + closest = diff; + best_freq_out = freq_out; + } } } } -- 2.7.4
next prev parent reply other threads:[~2017-04-04 16:45 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-04 16:45 [PATCH 0/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL Daniel Baluta 2017-04-04 16:45 ` Daniel Baluta 2017-04-04 16:45 ` [PATCH 1/2] ASoC: codec: wm9860: Refactor PLL out freq search Daniel Baluta 2017-04-04 16:45 ` Daniel Baluta 2017-04-05 9:01 ` Charles Keepax 2017-04-05 9:01 ` Charles Keepax 2017-04-05 10:02 ` [alsa-devel] " Daniel Baluta 2017-04-05 10:02 ` Daniel Baluta 2017-04-05 17:30 ` Applied "ASoC: codec: wm9860: Refactor PLL out freq search" to the asoc tree Mark Brown 2017-04-05 17:30 ` Mark Brown 2017-04-04 16:45 ` Daniel Baluta [this message] 2017-04-04 16:45 ` [PATCH 2/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL Daniel Baluta 2017-04-05 9:02 ` Charles Keepax 2017-04-05 9:02 ` Charles Keepax 2017-04-05 10:17 ` kbuild test robot 2017-04-05 10:17 ` kbuild test robot 2017-04-06 11:51 [PATCH 0/2] " Daniel Baluta 2017-04-06 11:51 ` [PATCH 2/2] " Daniel Baluta 2017-04-06 11:51 ` Daniel Baluta 2017-04-21 13:07 [PATCH 0/2] Relax bitclk " Daniel Baluta 2017-04-21 13:07 ` [PATCH 2/2] ASoC: codec: wm8960: Relax bit clock " Daniel Baluta 2017-04-21 13:07 ` Daniel Baluta 2017-04-21 14:44 ` Arnd Bergmann 2017-04-21 14:44 ` Arnd Bergmann
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