linux-kernel - [PATCH 11/16] ASoC: cs42l42: Use PLL for SCLK

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Date:   Fri, 15 Oct 2021 14:36:14 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH 11/16] ASoC: cs42l42: Use PLL for SCLK > 12.288MHz

It isn't possible to switch MCLK between 12MHz and 24MHz rate groups
on-the-fly - this can only be done when cs42l42 is powered-down.

All "normal" SCLK rates use an MCLK in the 12MHz group, so change the
configs for SCLK > 12.288 MHz to use the PLL to generate an MCLK in
the 12MHz group.

As this means MCLK_DIV is always 0 it can be removed from the pll
configuration setup.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 sound/soc/codecs/cs42l42.c | 41 ++++++++++++++++++-----------------------
 1 file changed, 18 insertions(+), 23 deletions(-)

diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c
index c18f42cc1044..64bcabeb8f57 100644
--- a/sound/soc/codecs/cs42l42.c
+++ b/sound/soc/codecs/cs42l42.c
@@ -539,7 +539,6 @@ static const struct reg_sequence cs42l42_to_osc_seq[] = {
 
 struct cs42l42_pll_params {
 	u32 sclk;
-	u8 mclk_div;
 	u8 mclk_src_sel;
 	u8 sclk_prediv;
 	u8 pll_div_int;
@@ -556,24 +555,24 @@ struct cs42l42_pll_params {
  * Table 4-5 from the Datasheet
  */
 static const struct cs42l42_pll_params pll_ratio_table[] = {
-	{ 1411200, 0, 1, 0x00, 0x80, 0x000000, 0x03, 0x10, 11289600, 128, 2},
-	{ 1536000, 0, 1, 0x00, 0x7D, 0x000000, 0x03, 0x10, 12000000, 125, 2},
-	{ 2304000, 0, 1, 0x00, 0x55, 0xC00000, 0x02, 0x10, 12288000,  85, 2},
-	{ 2400000, 0, 1, 0x00, 0x50, 0x000000, 0x03, 0x10, 12000000,  80, 2},
-	{ 2822400, 0, 1, 0x00, 0x40, 0x000000, 0x03, 0x10, 11289600, 128, 1},
-	{ 3000000, 0, 1, 0x00, 0x40, 0x000000, 0x03, 0x10, 12000000, 128, 1},
-	{ 3072000, 0, 1, 0x00, 0x3E, 0x800000, 0x03, 0x10, 12000000, 125, 1},
-	{ 4000000, 0, 1, 0x00, 0x30, 0x800000, 0x03, 0x10, 12000000,  96, 1},
-	{ 4096000, 0, 1, 0x00, 0x2E, 0xE00000, 0x03, 0x10, 12000000,  94, 1},
-	{ 5644800, 0, 1, 0x01, 0x40, 0x000000, 0x03, 0x10, 11289600, 128, 1},
-	{ 6000000, 0, 1, 0x01, 0x40, 0x000000, 0x03, 0x10, 12000000, 128, 1},
-	{ 6144000, 0, 1, 0x01, 0x3E, 0x800000, 0x03, 0x10, 12000000, 125, 1},
-	{ 11289600, 0, 0, 0, 0, 0, 0, 0, 11289600, 0, 1},
-	{ 12000000, 0, 0, 0, 0, 0, 0, 0, 12000000, 0, 1},
-	{ 12288000, 0, 0, 0, 0, 0, 0, 0, 12288000, 0, 1},
-	{ 22579200, 1, 0, 0, 0, 0, 0, 0, 22579200, 0, 1},
-	{ 24000000, 1, 0, 0, 0, 0, 0, 0, 24000000, 0, 1},
-	{ 24576000, 1, 0, 0, 0, 0, 0, 0, 24576000, 0, 1}
+	{ 1411200,  1, 0x00, 0x80, 0x000000, 0x03, 0x10, 11289600, 128, 2},
+	{ 1536000,  1, 0x00, 0x7D, 0x000000, 0x03, 0x10, 12000000, 125, 2},
+	{ 2304000,  1, 0x00, 0x55, 0xC00000, 0x02, 0x10, 12288000,  85, 2},
+	{ 2400000,  1, 0x00, 0x50, 0x000000, 0x03, 0x10, 12000000,  80, 2},
+	{ 2822400,  1, 0x00, 0x40, 0x000000, 0x03, 0x10, 11289600, 128, 1},
+	{ 3000000,  1, 0x00, 0x40, 0x000000, 0x03, 0x10, 12000000, 128, 1},
+	{ 3072000,  1, 0x00, 0x3E, 0x800000, 0x03, 0x10, 12000000, 125, 1},
+	{ 4000000,  1, 0x00, 0x30, 0x800000, 0x03, 0x10, 12000000,  96, 1},
+	{ 4096000,  1, 0x00, 0x2E, 0xE00000, 0x03, 0x10, 12000000,  94, 1},
+	{ 5644800,  1, 0x01, 0x40, 0x000000, 0x03, 0x10, 11289600, 128, 1},
+	{ 6000000,  1, 0x01, 0x40, 0x000000, 0x03, 0x10, 12000000, 128, 1},
+	{ 6144000,  1, 0x01, 0x3E, 0x800000, 0x03, 0x10, 12000000, 125, 1},
+	{ 11289600, 0, 0, 0, 0, 0, 0, 11289600, 0, 1},
+	{ 12000000, 0, 0, 0, 0, 0, 0, 12000000, 0, 1},
+	{ 12288000, 0, 0, 0, 0, 0, 0, 12288000, 0, 1},
+	{ 22579200, 1, 0x03, 0x40, 0x000000, 0x03, 0x10, 11289600, 128, 1},
+	{ 24000000, 1, 0x03, 0x40, 0x000000, 0x03, 0x10, 12000000, 128, 1},
+	{ 24576000, 1, 0x03, 0x40, 0x000000, 0x03, 0x10, 12288000, 128, 1}
 };
 
 static int cs42l42_pll_config(struct snd_soc_component *component)
@@ -609,10 +608,6 @@ static int cs42l42_pll_config(struct snd_soc_component *component)
 					24000000)) <<
 					CS42L42_INTERNAL_FS_SHIFT);
 
-			snd_soc_component_update_bits(component, CS42L42_MCLK_SRC_SEL,
-					CS42L42_MCLKDIV_MASK,
-					(pll_ratio_table[i].mclk_div <<
-					CS42L42_MCLKDIV_SHIFT));
 			/* Set up the LRCLK */
 			fsync = clk / cs42l42->srate;
 			if (((fsync * cs42l42->srate) != clk)
-- 
2.11.0