From: "Andrew F. Davis" <afd@ti.com> To: Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org> Cc: <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>, "Andrew F . Davis" <afd@ti.com> Subject: [PATCH v3 06/10] ASoC: tlv320aic31xx: Reset registers during power up Date: Thu, 7 Dec 2017 09:38:56 -0600 [thread overview] Message-ID: <20171207153900.9831-7-afd@ti.com> (raw) In-Reply-To: <20171207153900.9831-1-afd@ti.com> Add a reset function that toggles the reset line if available or uses the software reset command otherwise. Use this in power up to ensure the registers are in a sane state. This is useful when the driver module is reloaded, or after Kexec, warm-reboots, etc.. Signed-off-by: Andrew F. Davis <afd@ti.com> --- sound/soc/codecs/tlv320aic31xx.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/sound/soc/codecs/tlv320aic31xx.c b/sound/soc/codecs/tlv320aic31xx.c index e2bb78188b61..6cbe5820ce60 100644 --- a/sound/soc/codecs/tlv320aic31xx.c +++ b/sound/soc/codecs/tlv320aic31xx.c @@ -1026,6 +1026,22 @@ static int aic31xx_set_dai_sysclk(struct snd_soc_dai *codec_dai, return 0; } +static int aic31xx_reset(struct aic31xx_priv *aic31xx) +{ + int ret = 0; + + if (aic31xx->gpio_reset) { + gpiod_set_value(aic31xx->gpio_reset, 1); + ndelay(10); /* At least 10ns */ + gpiod_set_value(aic31xx->gpio_reset, 0); + } else { + ret = regmap_write(aic31xx->regmap, AIC31XX_RESET, 1); + } + mdelay(1); /* At least 1ms */ + + return ret; +} + static void aic31xx_clk_on(struct snd_soc_codec *codec) { struct aic31xx_priv *aic31xx = snd_soc_codec_get_drvdata(codec); @@ -1069,11 +1085,13 @@ static int aic31xx_power_on(struct snd_soc_codec *codec) if (ret) return ret; - if (aic31xx->gpio_reset) { - gpiod_set_value(aic31xx->gpio_reset, 0); - udelay(100); - } regcache_cache_only(aic31xx->regmap, false); + + /* Reset device registers for a consistent power-on like state */ + ret = aic31xx_reset(aic31xx); + if (ret < 0) + dev_err(aic31xx->dev, "Could not reset device: %d\n", ret); + ret = regcache_sync(aic31xx->regmap); if (ret) { dev_err(codec->dev, -- 2.15.0
WARNING: multiple messages have this Message-ID (diff)
From: "Andrew F. Davis" <afd@ti.com> To: Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org> Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, "Andrew F . Davis" <afd@ti.com> Subject: [PATCH v3 06/10] ASoC: tlv320aic31xx: Reset registers during power up Date: Thu, 7 Dec 2017 09:38:56 -0600 [thread overview] Message-ID: <20171207153900.9831-7-afd@ti.com> (raw) In-Reply-To: <20171207153900.9831-1-afd@ti.com> Add a reset function that toggles the reset line if available or uses the software reset command otherwise. Use this in power up to ensure the registers are in a sane state. This is useful when the driver module is reloaded, or after Kexec, warm-reboots, etc.. Signed-off-by: Andrew F. Davis <afd@ti.com> --- sound/soc/codecs/tlv320aic31xx.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/sound/soc/codecs/tlv320aic31xx.c b/sound/soc/codecs/tlv320aic31xx.c index e2bb78188b61..6cbe5820ce60 100644 --- a/sound/soc/codecs/tlv320aic31xx.c +++ b/sound/soc/codecs/tlv320aic31xx.c @@ -1026,6 +1026,22 @@ static int aic31xx_set_dai_sysclk(struct snd_soc_dai *codec_dai, return 0; } +static int aic31xx_reset(struct aic31xx_priv *aic31xx) +{ + int ret = 0; + + if (aic31xx->gpio_reset) { + gpiod_set_value(aic31xx->gpio_reset, 1); + ndelay(10); /* At least 10ns */ + gpiod_set_value(aic31xx->gpio_reset, 0); + } else { + ret = regmap_write(aic31xx->regmap, AIC31XX_RESET, 1); + } + mdelay(1); /* At least 1ms */ + + return ret; +} + static void aic31xx_clk_on(struct snd_soc_codec *codec) { struct aic31xx_priv *aic31xx = snd_soc_codec_get_drvdata(codec); @@ -1069,11 +1085,13 @@ static int aic31xx_power_on(struct snd_soc_codec *codec) if (ret) return ret; - if (aic31xx->gpio_reset) { - gpiod_set_value(aic31xx->gpio_reset, 0); - udelay(100); - } regcache_cache_only(aic31xx->regmap, false); + + /* Reset device registers for a consistent power-on like state */ + ret = aic31xx_reset(aic31xx); + if (ret < 0) + dev_err(aic31xx->dev, "Could not reset device: %d\n", ret); + ret = regcache_sync(aic31xx->regmap); if (ret) { dev_err(codec->dev, -- 2.15.0
next prev parent reply other threads:[~2017-12-07 15:40 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-12-07 15:38 [PATCH v3 00/10] Add Headphone Detection to TLV320AIC31xx Driver Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 15:38 ` [PATCH v3 01/10] ASoC: tlv320aic31xx: Fix GPIO header includes Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 17:48 ` Applied "ASoC: tlv320aic31xx: Fix GPIO header includes" to the asoc tree Mark Brown 2017-12-07 15:38 ` [PATCH v3 02/10] ASoC: tlv320aic31xx: Use fwnode APIs over raw OF calls Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 17:48 ` Applied "ASoC: tlv320aic31xx: Use fwnode APIs over raw OF calls" to the asoc tree Mark Brown 2017-12-07 15:38 ` [PATCH v3 03/10] ASoC: tlv320aic31xx: Remove platform data Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 15:38 ` [PATCH v3 04/10] ASoC: tlv320aic31xx: Add MICBIAS off setting Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 15:38 ` [PATCH v3 05/10] ASoC: tlv320aic31xx: Remove regulator notification handling Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis [this message] 2017-12-07 15:38 ` [PATCH v3 06/10] ASoC: tlv320aic31xx: Reset registers during power up Andrew F. Davis 2017-12-07 17:48 ` Applied "ASoC: tlv320aic31xx: Reset registers during power up" to the asoc tree Mark Brown 2017-12-07 15:38 ` [PATCH v3 07/10] ASoC: tlv320aic31xx: Add short circuit detection support Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 15:38 ` [PATCH v3 08/10] ASoC: tlv320aic31xx: Add overflow " Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 15:38 ` [PATCH v3 09/10] ASoC: tlv320aic31xx: Add headphone/headset detection Andrew F. Davis 2017-12-07 15:38 ` Andrew F. Davis 2017-12-07 15:39 ` [PATCH v3 10/10] ASoC: tlv320aic31xx: Add button press detection Andrew F. Davis 2017-12-07 15:39 ` Andrew F. Davis
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