linux-kernel - [PATCH 3.10 01/23] ASoC: sgtl5000: remove useless register write clearing CHRGPUMP

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Message-Id: <20150410131613.423433376@linuxfoundation.org>
Date:	Fri, 10 Apr 2015 15:18:55 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Eric Nelson <eric.nelson@...ndarydevices.com>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH 3.10 01/23] ASoC: sgtl5000: remove useless register write clearing CHRGPUMP_POWERUP

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Nelson <eric.nelson@...ndarydevices.com>

commit c7d910b87d3c8e9fcf4077089ca4327c12eee099 upstream.

The SGTL5000_CHIP_ANA_POWER register is cached. Update the cached
value instead of writing it directly.

Patch inspired by Russell King's more colorful remarks in this
patch:
	https://github.com/SolidRun/linux-imx6-3.14/commit/dd4bf6a

Signed-off-by: Eric Nelson <eric.nelson@...ndarydevices.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/codecs/sgtl5000.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1111,13 +1111,7 @@ static int sgtl5000_set_power_regs(struc
 		/* Enable VDDC charge pump */
 		ana_pwr |= SGTL5000_VDDC_CHRGPMP_POWERUP;
 	} else if (vddio >= 3100 && vdda >= 3100) {
-		/*
-		 * if vddio and vddd > 3.1v,
-		 * charge pump should be clean before set ana_pwr
-		 */
-		snd_soc_update_bits(codec, SGTL5000_CHIP_ANA_POWER,
-				SGTL5000_VDDC_CHRGPMP_POWERUP, 0);
-
+		ana_pwr &= ~SGTL5000_VDDC_CHRGPMP_POWERUP;
 		/* VDDC use VDDIO rail */
 		lreg_ctrl |= SGTL5000_VDDC_ASSN_OVRD;
 		lreg_ctrl |= SGTL5000_VDDC_MAN_ASSN_VDDIO <<


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