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: Thu, 6 Apr 2017 14:51:54 +0300 [thread overview]
Message-ID: <1491479514-24862-3-git-send-email-daniel.baluta@nxp.com> (raw)
In-Reply-To: <1491479514-24862-1-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>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
---
sound/soc/codecs/wm8960.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index ace69da..8ab9fa2 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
@@ -696,13 +700,14 @@ 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 = 0;
int i, j, k;
bclk = wm8960->bclk;
lrclk = wm8960->lrclk;
+ closest = freq_in;
- *bclk_idx = -1;
+ *bclk_idx = *dac_idx = *sysclk_idx = -1;
for (i = 0; i < ARRAY_SIZE(sysclk_divs); ++i) {
if (sysclk_divs[i] == -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;
+ }
}
if (k != ARRAY_SIZE(bclk_divs))
break;
--
2.7.4
next prev parent reply other threads:[~2017-04-06 11:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-06 11:51 [PATCH 0/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL Daniel Baluta
2017-04-06 11:51 ` [PATCH 1/2] ASoC: codec: wm8960: Stop when a matching PLL freq is found Daniel Baluta
2017-04-06 18:55 ` Applied "ASoC: codec: wm8960: Stop when a matching PLL freq is found" to the asoc tree Mark Brown
2017-04-06 11:51 ` Daniel Baluta [this message]
-- strict thread matches above, loose matches on Subject: below --
2017-04-21 13:07 [PATCH 0/2] Relax bitclk computation when using PLL Daniel Baluta
2017-04-21 13:07 ` [PATCH 2/2] ASoC: codec: wm8960: Relax bit clock " Daniel Baluta
2017-04-21 14:44 ` Arnd Bergmann
2017-04-04 16:45 [PATCH 0/2] " Daniel Baluta
2017-04-04 16:45 ` [PATCH 2/2] " Daniel Baluta
2017-04-05 9:02 ` Charles Keepax
2017-04-05 10:17 ` kbuild test robot
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