[Linux Audio Driver] SDM660平台内部PA Boost功能关闭

解决高通SDM660Boost模式功耗问题

最新推荐文章于 2022-12-15 09:46:42 发布

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本文详细介绍了如何在高通SDM660平台上解决默认开启的Boost模式导致的功耗增加问题。通过对比分析，找到关键寄存器差异，并提供具体的代码修改方案，以实现关闭Boost模式而不影响设备喇叭声音。

0. 背景

平台： android_9\LA.UM.7.2.r1\ ，SDM660

LA.UM.7.2.r1\kernel\msm-4.4\sound\soc\codecs\sdm660_cdc\msm-analog-cdc.c

高通代码默认打开了Boost模式，这玩意会影响功耗，如下：

static const DECLARE_TLV_DB_SCALE(analog_gain, 0, 25, 1);
static struct snd_soc_dai_driver msm_anlg_cdc_i2s_dai[];
/* By default enable the internal speaker boost */
static bool spkr_boost_en = true;

在这里插入图片描述

C:\Users\Administrator>adb shell
sdm660_64:/ # tinymix |  grep  Boost
tinymix |  grep  Boost
75      ENUM    1       Boost Option                             BOOST_SWITCH
76      ENUM    1       EAR PA Boost                             DISABLE
78      ENUM    1       Speaker Boost                            ENABLE
79      ENUM    1       Ext Spk Boost                            DISABLE

但是你用tinyalsa命令把这个控件关闭，设备喇叭就直接没声音了-_- ||：

sdm660_64:/ # tinymix  "Speaker Boost" "DISABLE"
tinymix  "Speaker Boost" "DISABLE"
sdm660_64:/ #

sdm660_64:/ # tinymix |  grep  Boost
tinymix |  grep  Boost
75      ENUM    1       Boost Option                             BOOST_SWITCH
76      ENUM    1       EAR PA Boost                             DISABLE
78      ENUM    1       Speaker Boost                            DISABLE
79      ENUM    1       Ext Spk Boost                            DISABLE

1. 修改方案

对比其他默认关闭Boost的平台，发现了这个寄存器差异：

在这里插入图片描述

检索这个宏，发现定义，第三个参数是偏移位，SND_SOC_NOPM默认值是 -1

./kernel/msm-4.4/include/sound/soc-dapm.h

struct device;

/* widget has no PM register bit */
#define SND_SOC_NOPM    -1

/*
 * SoC dynamic audio power management
 *
 * We can have up to 4 power domains
 *  1. Codec domain - VREF, VMID

$ grep  -nr "SND_SOC_DAPM_PGA_E" ./kernel/msm-4.9/

./kernel/msm-4.9/include/sound/soc-dapm.h:139:#define SND_SOC_DAPM_PGA_E
(wname, wreg, wshift, winvert, wcontrols, \


$ vim ./kernel/msm-4.9/include/sound/soc-dapm.h +139


/* path domain with event - event handler must return 0 for success */
#define SND_SOC_DAPM_PGA_E(wname, wreg, wshift, winvert, wcontrols, \
        wncontrols, wevent, wflags) \
{       .id = snd_soc_dapm_pga, .name = wname, \
        SND_SOC_DAPM_INIT_REG_VAL(wreg, wshift, winvert), \
        .kcontrol_news = wcontrols, .num_kcontrols = wncontrols, \
        .event = wevent, .event_flags = wflags}

MSM89XX_PMIC_ANALOG_SPKR_DRV_CTL的高通寄存器介绍如下：
在这里插入图片描述

2. 偏移7位对应Bits7，最终修改patch如下

diff --git a/kernel/msm-4.4/sound/soc/codecs/sdm660_cdc/msm-analog-cdc.c 
b/kernel/msm-4.4/sound/soc/codecs/sdm660_cdc/msm-analog-cdc.c

index dcf1e9f..a6ade34 100755
--- a/kernel/msm-4.4/sound/soc/codecs/sdm660_cdc/msm-analog-cdc.c
+++ b/kernel/msm-4.4/sound/soc/codecs/sdm660_cdc/msm-analog-cdc.c
@@ -3423,10 +3423,10 @@
 		msm_anlg_cdc_hph_pa_event, SND_SOC_DAPM_PRE_PMU |
 		SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD |
 		SND_SOC_DAPM_POST_PMD),
-	SND_SOC_DAPM_PGA_E("SPK PA", SND_SOC_NOPM,
-			0, 0, NULL, 0, msm_anlg_cdc_codec_enable_spk_pa,
-			SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
-			SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMD),
+	SND_SOC_DAPM_PGA_E("SPK PA", MSM89XX_PMIC_ANALOG_SPKR_DRV_CTL,
+		7, 0, NULL, 0, msm_anlg_cdc_codec_enable_spk_pa,
+		SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
+		SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMD),
 	SND_SOC_DAPM_PGA_E("LINEOUT PA", MSM89XX_PMIC_ANALOG_RX_LO_EN_CTL,
 			5, 0, NULL, 0, msm_anlg_cdc_codec_enable_lo_pa,
 			SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
diff --git a/kernel/msm-4.4/sound/soc/msm/sdm660-internal.c 
b/kernel/msm-4.4/sound/soc/msm/sdm660-internal.c
old mode 100644
new mode 100755
index 4e2a403..69b1f03
--- a/kernel/msm-4.4/sound/soc/msm/sdm660-internal.c
+++ b/kernel/msm-4.4/sound/soc/msm/sdm660-internal.c
@@ -32,6 +32,8 @@
 #define WSA8810_NAME_1 "wsa881x.20170211"
 #define WSA8810_NAME_2 "wsa881x.20170212"
 
+extern void msm_anlg_cdc_update_int_spk_boost(bool enable);
+
 enum {
 	INT0_MI2S = 0,
 	INT1_MI2S,
@@ -495,6 +497,7 @@
 	if (pdata->spk_ext_pa_gpio < 0) {
 		dev_dbg(&pdev->dev,
 			"%s: missing %s in dt node\n", __func__, spk_ext_pa);
+		return -EINVAL;
 	} else {
 		if (!gpio_is_valid(pdata->spk_ext_pa_gpio)) {
 			pr_err("%s: Invalid external speaker gpio: %d",
@@ -3170,11 +3173,12 @@
 	int ret;
 
 	ret = is_ext_spk_gpio_support(pdev, pdata);
-	if (ret < 0)
+	if (ret < 0){
+		msm_anlg_cdc_update_int_spk_boost(false);
 		dev_dbg(&pdev->dev,
 			"%s: doesn't support external speaker pa\n",
 			__func__);
-
+	}
 	ret = of_property_read_string(pdev->dev.of_node,
 				      hs_micbias_type, &type);
 	if (ret) {
@@ -3243,7 +3247,7 @@
 		     struct wcd_mbhc_config *mbhc_cfg)
 {
 	mbhc_cfg_ptr = mbhc_cfg;
-
+	
 	*card = msm_int_populate_sndcard_dailinks(&pdev->dev);
 	msm_internal_init(pdev, pdata, *card);
 	return 0;

3. 作者注

/******
@article{Linux Audio Driver,
Author = { 1byte ≠ 8bit},
Year = { 2020},
}
******/