From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757003Ab2GNFhX (ORCPT ); Sat, 14 Jul 2012 01:37:23 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:37143 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753789Ab2GNFhV (ORCPT ); Sat, 14 Jul 2012 01:37:21 -0400 Message-ID: <1342244233.4207.1.camel@phoenix> Subject: [PATCH RFT 1/2] regulator: twl: Fix checking voltage range in twl6030smps_set_voltage() From: Axel Lin To: Mark Brown Cc: Rajendra Nayak , Peter Ujfalusi , Liam Girdwood , linux-kernel@vger.kernel.org Date: Sat, 14 Jul 2012 13:37:13 +0800 Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The voltage selection logic is supposed to find the samllest voltage falls within specified range. When using equation to calculate vsel, we need to ensure the requested min_uV meet the range of using the equation. Otherwise we may select a voltage that is out of specified range. For example, in the case vsel = 62 means select voltage of 2100000uV. What we want is to ensure the requested min_uV <= 2100000 rather than checking max_uV >= 2100000. And this also means in the case min_uV > 2100000, vsel = 62 does not meet the request. Also calling twl6030smps_list_voltage() for all cases to ensure the selected voltage still in bounds. Signed-off-by: Axel Lin --- drivers/regulator/twl-regulator.c | 36 ++++++++++++++++-------------------- 1 file changed, 16 insertions(+), 20 deletions(-) diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c index 8f0bd56..03d0bea 100644 --- a/drivers/regulator/twl-regulator.c +++ b/drivers/regulator/twl-regulator.c @@ -760,32 +760,28 @@ twl6030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, unsigned int *selector) { struct twlreg_info *info = rdev_get_drvdata(rdev); - int vsel = 0; + int vsel = 0, calc_uV; switch (info->flags) { case 0: if (min_uV == 0) vsel = 0; else if ((min_uV >= 600000) && (min_uV <= 1300000)) { - int calc_uV; vsel = DIV_ROUND_UP(min_uV - 600000, 12500); vsel++; - calc_uV = twl6030smps_list_voltage(rdev, vsel); - if (calc_uV > max_uV) - return -EINVAL; } /* Values 1..57 for vsel are linear and can be calculated * values 58..62 are non linear. */ - else if ((min_uV > 1900000) && (max_uV >= 2100000)) + else if ((min_uV > 1900000) && (min_uV <= 2100000)) vsel = 62; - else if ((min_uV > 1800000) && (max_uV >= 1900000)) + else if ((min_uV > 1800000) && (min_uV <= 1900000)) vsel = 61; - else if ((min_uV > 1500000) && (max_uV >= 1800000)) + else if ((min_uV > 1500000) && (min_uV <= 1800000)) vsel = 60; - else if ((min_uV > 1350000) && (max_uV >= 1500000)) + else if ((min_uV > 1350000) && (min_uV <= 1500000)) vsel = 59; - else if ((min_uV > 1300000) && (max_uV >= 1350000)) + else if ((min_uV > 1300000) && (min_uV <= 1350000)) vsel = 58; else return -EINVAL; @@ -794,25 +790,21 @@ twl6030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, if (min_uV == 0) vsel = 0; else if ((min_uV >= 700000) && (min_uV <= 1420000)) { - int calc_uV; vsel = DIV_ROUND_UP(min_uV - 700000, 12500); vsel++; - calc_uV = twl6030smps_list_voltage(rdev, vsel); - if (calc_uV > max_uV) - return -EINVAL; } /* Values 1..57 for vsel are linear and can be calculated * values 58..62 are non linear. */ - else if ((min_uV > 1900000) && (max_uV >= 2100000)) + else if ((min_uV > 1900000) && (min_uV <= 2100000)) vsel = 62; - else if ((min_uV > 1800000) && (max_uV >= 1900000)) + else if ((min_uV > 1800000) && (min_uV <= 1900000)) vsel = 61; - else if ((min_uV > 1350000) && (max_uV >= 1800000)) + else if ((min_uV > 1350000) && (min_uV <= 1800000)) vsel = 60; - else if ((min_uV > 1350000) && (max_uV >= 1500000)) + else if ((min_uV > 1350000) && (min_uV <= 1500000)) vsel = 59; - else if ((min_uV > 1300000) && (max_uV >= 1350000)) + else if ((min_uV > 1300000) && (min_uV <= 1350000)) vsel = 58; else return -EINVAL; @@ -828,13 +820,17 @@ twl6030smps_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, case SMPS_OFFSET_EN|SMPS_EXTENDED_EN: if (min_uV == 0) { vsel = 0; - } else if ((min_uV >= 2161000) && (max_uV <= 4321000)) { + } else if ((min_uV >= 2161000) && (min_uV <= 4321000)) { vsel = DIV_ROUND_UP(min_uV - 2161000, 38600); vsel++; } break; } + calc_uV = twl6030smps_list_voltage(rdev, vsel); + if (calc_uV > max_uV) + return -EINVAL; + *selector = vsel; return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE_SMPS, -- 1.7.9.5