linux-kernel - [PATCH 3.4 103/172] ASoC: sgtl5000: remove useless register write clearing CHRGPUMP

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Message-Id: <1434443826-4929-103-git-send-email-lizf@kernel.org>
Date:	Tue, 16 Jun 2015 16:35:57 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Eric Nelson <eric.nelson@...ndarydevices.com>,
	Mark Brown <broonie@...nel.org>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 103/172] ASoC: sgtl5000: remove useless register write clearing CHRGPUMP_POWERUP

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

3.4.108-rc1 review patch.  If anyone has any objections, please let me know.

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


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: Zefan Li <lizefan@...wei.com>
---
 sound/soc/codecs/sgtl5000.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c
index 87cbf14..e8a7608f 100644
--- a/sound/soc/codecs/sgtl5000.c
+++ b/sound/soc/codecs/sgtl5000.c
@@ -1107,13 +1107,7 @@ static int sgtl5000_set_power_regs(struct snd_soc_codec *codec)
 		/* 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 <<
-- 
1.9.1

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