[PATCH 0/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL

[PATCH 0/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL

[Daniel Baluta]

This is a follow up of patch series sent here:

http://mailman.alsa-project.org/pipermail/alsa-devel/2017-April/119517.html

where only patch 1/2 was merged.

In this new patch series, we fix a problem with patch already merged and
then we relax bit clock computation when using PLL the same as we did
in patch 2/2 of previous series.

Daniel Baluta (2):
  ASoC: codec: wm8960: Stop when a matching PLL freq is found
  ASoC: codec: wm8960: Relax bit clock computation when using PLL

 sound/soc/codecs/wm8960.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

-- 
2.7.4

[PATCH 1/2] ASoC: codec: wm8960: Stop when a matching PLL freq is found

[Daniel Baluta]

When a matching PLL freq is found, searching continues even this is
not necessary. The problem was introduced with the following refactoring
commit 84fdc00d519ffd ("ASoC: codec: wm9860: Refactor PLL out freq search)

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
---
 sound/soc/codecs/wm8960.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 36c8454..ace69da 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -724,7 +724,11 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
 					break;
 				}
 			}
+			if (k != ARRAY_SIZE(bclk_divs))
+				break;
 		}
+		if (j != ARRAY_SIZE(dac_divs))
+			break;
 	}
 
 	if (*bclk_idx != -1)
-- 
2.7.4

Applied "ASoC: codec: wm8960: Stop when a matching PLL freq is found" to the asoc tree

[Mark Brown]

The patch

   ASoC: codec: wm8960: Stop when a matching PLL freq is found

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 303e8954af8daa087e4f42788672d280337071ab Mon Sep 17 00:00:00 2001
From: Daniel Baluta <daniel.baluta@nxp.com>
Date: Thu, 6 Apr 2017 14:51:53 +0300
Subject: [PATCH] ASoC: codec: wm8960: Stop when a matching PLL freq is found

When a matching PLL freq is found, searching continues even this is
not necessary. The problem was introduced with the following refactoring
commit 84fdc00d519ffd ("ASoC: codec: wm9860: Refactor PLL out freq search)

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/codecs/wm8960.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 36c84549da23..ace69da97cb8 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -724,7 +724,11 @@ int wm8960_configure_pll(struct snd_soc_codec *codec, int freq_in,
 					break;
 				}
 			}
+			if (k != ARRAY_SIZE(bclk_divs))
+				break;
 		}
+		if (j != ARRAY_SIZE(dac_divs))
+			break;
 	}
 
 	if (*bclk_idx != -1)
-- 
2.11.0

[PATCH 2/2] ASoC: codec: wm8960: Relax bit clock computation when using PLL

[Daniel Baluta]

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