From patchwork Thu Jul 25 09:45:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gregory CLEMENT X-Patchwork-Id: 11058351 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BE307912 for ; Thu, 25 Jul 2019 09:46:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AE5612893F for ; Thu, 25 Jul 2019 09:46:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A2A062899C; Thu, 25 Jul 2019 09:46:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0D9B72893F for ; Thu, 25 Jul 2019 09:46:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729712AbfGYJqD (ORCPT ); Thu, 25 Jul 2019 05:46:03 -0400 Received: from relay2-d.mail.gandi.net ([217.70.183.194]:46217 "EHLO relay2-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729162AbfGYJqC (ORCPT ); Thu, 25 Jul 2019 05:46:02 -0400 X-Originating-IP: 92.137.69.152 Received: from localhost (alyon-656-1-672-152.w92-137.abo.wanadoo.fr [92.137.69.152]) (Authenticated sender: gregory.clement@bootlin.com) by relay2-d.mail.gandi.net (Postfix) with ESMTPSA id ED6D040006; Thu, 25 Jul 2019 09:45:58 +0000 (UTC) From: Gregory CLEMENT To: Liam Girdwood , Mark Brown , linux-kernel@vger.kernel.org Cc: Rob Herring , devicetree@vger.kernel.org, Tony Lindgren , linux-omap@vger.kernel.org, Thomas Petazzoni , Gregory CLEMENT Subject: [PATCH 3/3] regulator: twl6030: workaround the VMMC reset behavior Date: Thu, 25 Jul 2019 11:45:42 +0200 Message-Id: <20190725094542.16547-4-gregory.clement@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190725094542.16547-1-gregory.clement@bootlin.com> References: <20190725094542.16547-1-gregory.clement@bootlin.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP During reset the VMMC regulator doesn't reach 0V and only drops to 1.8V, furthermore the pulse width is under 200us whereas the SD specification expect 1ms. The WR_S bit allows the TWL6030 to no reset at all the VMMC during warm reset and keep the current voltage. Thanks to this workaround the SD card doesn't reach a undefined reset stage. Actually this behavior is available for all the LDO regulator, so the driver will also allow to use it with any of these regulator. Signed-off-by: Gregory CLEMENT --- drivers/regulator/twl6030-regulator.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/regulator/twl6030-regulator.c b/drivers/regulator/twl6030-regulator.c index d73c81542ceb..b8100c3cedad 100644 --- a/drivers/regulator/twl6030-regulator.c +++ b/drivers/regulator/twl6030-regulator.c @@ -57,6 +57,9 @@ struct twlreg_info { #define VREG_BC_PROC 3 #define VREG_BC_CLK_RST 4 +/* TWL6030 LDO register values for VREG_VOLTAGE */ +#define TWL6030_VREG_VOLTAGE_WR_S BIT(7) + /* TWL6030 LDO register values for CFG_STATE */ #define TWL6030_CFG_STATE_OFF 0x00 #define TWL6030_CFG_STATE_ON 0x01 @@ -68,9 +71,10 @@ struct twlreg_info { #define TWL6030_CFG_STATE_APP(v) (((v) & TWL6030_CFG_STATE_APP_MASK) >>\ TWL6030_CFG_STATE_APP_SHIFT) -/* Flags for SMPS Voltage reading */ +/* Flags for SMPS Voltage reading and LDO reading*/ #define SMPS_OFFSET_EN BIT(0) #define SMPS_EXTENDED_EN BIT(1) +#define TWL_6030_WARM_RESET BIT(3) /* twl6032 SMPS EPROM values */ #define TWL6030_SMPS_OFFSET 0xB0 @@ -250,6 +254,9 @@ twl6030ldo_set_voltage_sel(struct regulator_dev *rdev, unsigned selector) { struct twlreg_info *info = rdev_get_drvdata(rdev); + if (info->flags & TWL_6030_WARM_RESET) + selector |= TWL6030_VREG_VOLTAGE_WR_S; + return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE, selector); } @@ -259,6 +266,9 @@ static int twl6030ldo_get_voltage_sel(struct regulator_dev *rdev) struct twlreg_info *info = rdev_get_drvdata(rdev); int vsel = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_VOLTAGE); + if (info->flags & TWL_6030_WARM_RESET) + vsel &= ~TWL6030_VREG_VOLTAGE_WR_S; + return vsel; } @@ -710,6 +720,9 @@ static int twlreg_probe(struct platform_device *pdev) break; } + if (of_get_property(np, "ti,retain-on-reset", NULL)) + info->flags |= TWL_6030_WARM_RESET; + config.dev = &pdev->dev; config.init_data = initdata; config.driver_data = info;