linux-kernel - [PATCH 3.16 056/134] regulator: tps65023: Fix inverted core enable logic.

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Message-ID: <lsq.1503062000.460636665@decadent.org.uk>
Date:   Fri, 18 Aug 2017 14:13:20 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Richard Cochran" <rcochran@...utronix.de>,
        "Mark Brown" <broonie@...nel.org>
Subject: [PATCH 3.16 056/134] regulator: tps65023: Fix inverted core
 enable logic.

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

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

From: Richard Cochran <rcochran@...utronix.de>

commit c90722b54a4f5e21ac59301ed9a6dbaa439bdb16 upstream.

Commit 43530b69d758328d3ffe6ab98fd640463e8e3667 ("regulator: Use
regmap_read/write(), regmap_update_bits functions directly") intended
to replace working inline helper functions with standard regmap
calls.  However, it also inverted the set/clear logic of the "CORE ADJ
Allowed" bit.  That patch was clearly never tested, since without that
bit cleared, the core VDCDC1 voltage output does not react to I2C
configuration changes.

This patch fixes the issue by clearing the bit as in the original,
correct implementation.  Note for stable back porting that, due to
subsequent driver churn, this patch will not apply on every kernel
version.

Fixes: 43530b69d758 ("regulator: Use regmap_read/write(), regmap_update_bits functions directly")
Signed-off-by: Richard Cochran <rcochran@...utronix.de>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/regulator/tps65023-regulator.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/regulator/tps65023-regulator.c
+++ b/drivers/regulator/tps65023-regulator.c
@@ -293,8 +293,7 @@ static int tps_65023_probe(struct i2c_cl

 	/* Enable setting output voltage by I2C */
 	regmap_update_bits(tps->regmap, TPS65023_REG_CON_CTRL2,
-					TPS65023_REG_CTRL2_CORE_ADJ,
-					TPS65023_REG_CTRL2_CORE_ADJ);
+			   TPS65023_REG_CTRL2_CORE_ADJ, 0);

 	return 0;
 }