From 9a59d4496c244ccd4bd78f6d5c12a62e83db3a73 Mon Sep 17 00:00:00 2001
From: Aurelien Jarno <aurelien@aurel32.net>
Date: Sun, 23 Jan 2022 00:35:38 +0100
Subject: kernel module: switch to BD modulation

It is smpler from the configuration point of view and does not require
the DSP, which requires PPC3.
---
 tas5825m-module/tas5825m.c | 158 +++------------------------------------------
 1 file changed, 10 insertions(+), 148 deletions(-)

diff --git a/tas5825m-module/tas5825m.c b/tas5825m-module/tas5825m.c
index fdca808..612c94c 100644
--- a/tas5825m-module/tas5825m.c
+++ b/tas5825m-module/tas5825m.c
@@ -100,8 +100,8 @@ static int tas5825m_i2c_probe(struct i2c_client *client,
 		tas5825m->pdn_gpio = NULL;
 	}
 
-	/* power-up time may be as long as 1ms */
-	mdelay(1);
+	/* power-up time may be as long as 5ms */
+	mdelay(5);
 
 	/* PAGE 0x00, BOOK 0x00 */
 	tas5825m_write_reg(client, 0x00, 0x00);
@@ -109,13 +109,6 @@ static int tas5825m_i2c_probe(struct i2c_client *client,
 
 	/* Reset register and digital core */
 	tas5825m_write_reg(client, 0x01, 0x11);
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x00, 0x00);
 
 	/* PAGE 0x00, BOOK 0x00 */
 	tas5825m_write_reg(client, 0x00, 0x00);
@@ -124,158 +117,27 @@ static int tas5825m_i2c_probe(struct i2c_client *client,
 	/* Switch from deep sleep to Hi-z mode, keep mute enabled */
 	tas5825m_write_reg(client, 0x03, 0x12);
 
-	/* GPIO0, GPIO1 and GPIO2 as output */
+	/* Configure GPIO0, GPIO1 and GPIO2 as outputs */
 	tas5825m_write_reg(client, 0x60, 0x07);
 	tas5825m_write_reg(client, 0x61, 0x02);
 	tas5825m_write_reg(client, 0x62, 0x02);
 	tas5825m_write_reg(client, 0x63, 0x02);
 
 	/* GPIO0 = 1, GPIO1 = 0, GPIO2 = 1 */
-//	tas5825m_write_reg(client, 0x65, 0x05);
-	tas5825m_write_reg(client, 0x65, 0x00);
+	tas5825m_write_reg(client, 0x65, 0x05);
 
-	/* ??? */
-	tas5825m_write_reg(client, 0x7f, 0x00);
-	tas5825m_write_reg(client, 0x7d, 0x11); /* ???? */
-	tas5825m_write_reg(client, 0x7e, 0xff); /* ???? */
-	tas5825m_write_reg(client, 0x00, 0x01); /* Page 0x01 */
-	tas5825m_write_reg(client, 0x51, 0x05);
-	tas5825m_write_reg(client, 0x00, 0x02); /* Page 0x02 */
-	tas5825m_write_reg(client, 0x19, 0xa0);
-	tas5825m_write_reg(client, 0x1d, 0x01);
-	tas5825m_write_reg(client, 0x00, 0x00); /* Page 0x00 */
-	tas5825m_write_reg(client, 0x7f, 0x00); /* Book 0x00 */
-	tas5825m_write_reg(client, 0x46, 0x01); /* DSP_CTRL */
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x02, 0x42); /* # 768kHz, BTL, Hybrid mode */
+	/* Configure the chip */
+        tas5825m_write_reg(client, 0x02, 0x40); /* # 768kHz, BTL, BD mode */
 	tas5825m_write_reg(client, 0x53, 0x60); /* # 175kHz bandwidth */
-	tas5825m_write_reg(client, 0x54, 0x04); /* Analog gain of -2.0dB (originally 0) */
-	tas5825m_write_reg(client, 0x00, 0x00); /* Page 0x00 */
-	tas5825m_write_reg(client, 0x7f, 0x00); /* Book 0x00 */
+	tas5825m_write_reg(client, 0x54, 0x04); /* Analog gain of -2.0dB for 24V */
+	tas5825m_write_reg(client, 0x4c, 0x30); /* Digital volume 0dB */
 	tas5825m_write_reg(client, 0x03, 0x02); /* Hiz, unmute */
 
+	/* Wait for the device to settle down */
 	mdelay(5);
 
-	tas5825m_write_reg(client, 0x00, 0x00); 
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x00, 0x00);
-	tas5825m_write_reg(client, 0x7f, 0x8c); /* Book 0x8c */
-	tas5825m_write_reg(client, 0x00, 0x06); /* Page 0x06 */
-	tas5825m_write_reg(client, 0x38, 0x00);
-	tas5825m_write_reg(client, 0x39, 0x00);
-	tas5825m_write_reg(client, 0x3a, 0x04);
-	tas5825m_write_reg(client, 0x3b, 0x00);
-
-	/* Tuning coeffs */
-	tas5825m_write_reg(client, 0x00, 0x0b); /* Page 0x0b */
-	tas5825m_write_reg(client, 0x50, 0x00);
-	tas5825m_write_reg(client, 0x51, 0x20);
-	tas5825m_write_reg(client, 0x52, 0xc4);
-	tas5825m_write_reg(client, 0x53, 0x9c);
-	tas5825m_write_reg(client, 0x5c, 0x7f);
-	tas5825m_write_reg(client, 0x5d, 0xff);
-	tas5825m_write_reg(client, 0x5e, 0xff);
-	tas5825m_write_reg(client, 0x5f, 0xff);
-
-	/* Book 0x8c */
-	tas5825m_write_reg(client, 0x00, 0x00); /* Page 0x00 */
-	tas5825m_write_reg(client, 0x7f, 0x8c); /* Book 0x8c */
-
-	tas5825m_write_reg(client, 0x00, 0x01); /* Page 0x01 */
-	tas5825m_write_reg(client, 0x28, 0x40); /* => enable AGL */
-	tas5825m_write_reg(client, 0x29, 0x00);
-	tas5825m_write_reg(client, 0x2a, 0x00);
-	tas5825m_write_reg(client, 0x2b, 0x00);
-
-	tas5825m_write_reg(client, 0x00, 0x0a); /* Page 0x0a */
-	tas5825m_write_reg(client, 0x64, 0x00); /* Digital left from left = 0x00800000 */
-	tas5825m_write_reg(client, 0x65, 0x80);
-	tas5825m_write_reg(client, 0x66, 0x00);
-	tas5825m_write_reg(client, 0x67, 0x00);
-	tas5825m_write_reg(client, 0x68, 0x00); /* Digital left from right = 0x00000000 */
-	tas5825m_write_reg(client, 0x69, 0x00);
-	tas5825m_write_reg(client, 0x6a, 0x00);
-	tas5825m_write_reg(client, 0x6b, 0x00);
-	tas5825m_write_reg(client, 0x6c, 0x00); /* Digital right from left = 0x00000000 */
-	tas5825m_write_reg(client, 0x6d, 0x00);
-	tas5825m_write_reg(client, 0x6e, 0x00);
-	tas5825m_write_reg(client, 0x6f, 0x00);
-	tas5825m_write_reg(client, 0x70, 0x00); /* Digital right from right = 0x008000000 */
-	tas5825m_write_reg(client, 0x71, 0x80);
-	tas5825m_write_reg(client, 0x72, 0x00);
-	tas5825m_write_reg(client, 0x73, 0x00);
-	tas5825m_write_reg(client, 0x74, 0x00); /* Analog left from left = 0x008000000 */
-	tas5825m_write_reg(client, 0x75, 0x80);
-	tas5825m_write_reg(client, 0x76, 0x00);
-	tas5825m_write_reg(client, 0x77, 0x00);
-	tas5825m_write_reg(client, 0x78, 0x00); /* Analog left from right = 0x00000000 */
-	tas5825m_write_reg(client, 0x79, 0x00);
-	tas5825m_write_reg(client, 0x7a, 0x00);
-	tas5825m_write_reg(client, 0x7b, 0x00);
-	tas5825m_write_reg(client, 0x7c, 0x00); /* Analog right from left = 0x00000000 */
-	tas5825m_write_reg(client, 0x7d, 0x00);
-	tas5825m_write_reg(client, 0x7e, 0x00);
-	tas5825m_write_reg(client, 0x7f, 0x00);
-
-	tas5825m_write_reg(client, 0x00, 0x0b); /* Page 0x0b */
-	tas5825m_write_reg(client, 0x08, 0x00); /* Analog right from right = 0x008000000 */
-	tas5825m_write_reg(client, 0x09, 0x80);
-	tas5825m_write_reg(client, 0x0a, 0x00);
-	tas5825m_write_reg(client, 0x0b, 0x00);
-
-	tas5825m_write_reg(client, 0x38, 0x02); /* AGL PVDD alpha */
-	tas5825m_write_reg(client, 0x39, 0xa3);
-	tas5825m_write_reg(client, 0x3a, 0x9a);
-	tas5825m_write_reg(client, 0x3b, 0xcc);
-	tas5825m_write_reg(client, 0x3c, 0x00); /* AGL temp alpha */
-	tas5825m_write_reg(client, 0x3d, 0x06);
-	tas5825m_write_reg(client, 0x3e, 0xd3);
-	tas5825m_write_reg(client, 0x3f, 0x72);
-
-	tas5825m_write_reg(client, 0x48, 0x04); /* AGL softening filter */ 
-	tas5825m_write_reg(client, 0x49, 0xc1);
-	tas5825m_write_reg(client, 0x4a, 0xff);
-	tas5825m_write_reg(client, 0x4b, 0x93);
-	tas5825m_write_reg(client, 0x4c, 0x01); /* AGL attack rate */
-	tas5825m_write_reg(client, 0x4d, 0x12);
-	tas5825m_write_reg(client, 0x4e, 0x6e);
-	tas5825m_write_reg(client, 0x4f, 0x98);
-
-	tas5825m_write_reg(client, 0x54, 0x7b); /* AGL softening filter omega */
-	tas5825m_write_reg(client, 0x55, 0x3e);
-	tas5825m_write_reg(client, 0x56, 0x00);
-	tas5825m_write_reg(client, 0x57, 0x6d);
-	tas5825m_write_reg(client, 0x58, 0x00); /* AGL release rate */
-	tas5825m_write_reg(client, 0x59, 0x00);
-	tas5825m_write_reg(client, 0x5a, 0xae);
-	tas5825m_write_reg(client, 0x5b, 0xc3);
-
-	tas5825m_write_reg(client, 0x60, 0x08); /* AGL PVDD threshold*/
-	tas5825m_write_reg(client, 0x61, 0x13);
-	tas5825m_write_reg(client, 0x62, 0x85);
-	tas5825m_write_reg(client, 0x63, 0x62);
-	tas5825m_write_reg(client, 0x64, 0x00); /* AGL temp scale */
-	tas5825m_write_reg(client, 0x65, 0x80);
-	tas5825m_write_reg(client, 0x66, 0x00);
-	tas5825m_write_reg(client, 0x67, 0x00);
-	tas5825m_write_reg(client, 0x6c, 0x00); /* AGL volt scale */
-	tas5825m_write_reg(client, 0x6d, 0x78);
-	tas5825m_write_reg(client, 0x6e, 0xd6);
-	tas5825m_write_reg(client, 0x6f, 0xfd);
-	tas5825m_write_reg(client, 0x70, 0x00); /* Volt/temp scale */
-	tas5825m_write_reg(client, 0x71, 0x08);
-	tas5825m_write_reg(client, 0x72, 0x13);
-	tas5825m_write_reg(client, 0x73, 0x85);
-
-	/* Register Tuning */
-	tas5825m_write_reg(client, 0x00, 0x00); /* Page 0x00 */
-	tas5825m_write_reg(client, 0x7f, 0x00); /* Book 0x00 */
-	tas5825m_write_reg(client, 0x30, 0x00); /* SDOUT is the DSP output */
-	tas5825m_write_reg(client, 0x4c, 0x30); /* Digital volume 0dB */
+	/* Start playing */
 	tas5825m_write_reg(client, 0x03, 0x03); /* Play mode */
-	tas5825m_write_reg(client, 0x00, 0x00); /* Page 0x00 */
-	tas5825m_write_reg(client, 0x7f, 0x00); /* Book 0x00 */
 	tas5825m_write_reg(client, 0x78, 0x80); /* Clear analog fault */
 
 	ret = devm_snd_soc_register_component(dev,
-- 
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