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Thu, 8 Mar 2018 01:38:58 -0500 Received: from mail-sn1nam01on0106.outbound.protection.outlook.com ([104.47.32.106]:14491 "EHLO NAM01-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965329AbeCHE7L (ORCPT ); Wed, 7 Mar 2018 23:59:11 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Brian Norris , Linus Walleij , Sasha Levin Subject: [PATCH AUTOSEL for 4.14 51/67] pinctrl: rockchip: enable clock when reading pin direction register Thread-Topic: [PATCH AUTOSEL for 4.14 51/67] pinctrl: rockchip: enable clock when reading pin direction register Thread-Index: AQHTtpoE4u2lMJiWWkOklSJRgVO/6g== Date: Thu, 8 Mar 2018 04:57:53 +0000 Message-ID: <20180308045641.7814-51-alexander.levin@microsoft.com> References: <20180308045641.7814-1-alexander.levin@microsoft.com> In-Reply-To: <20180308045641.7814-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1015;7:e3soiwB1BBChQF50NRm76sEUrx6reihwtnzgYA3DtvcaRRZGgJjm3drYbTr2Qnhasg+9dF50h9uWU9oxasLF6qe5j9R1HLBv4GYS/xg7jG4Zy1ps69DKyIFFASYJQCraBH/vXyxjshLL25zhOxlYyt+8ABY+1+Re+HX4vRpXYVVHeRwmMIAJ23GxqYLMEDaEvK3HyV9LQOG2Mdlnc3VJ4RBL4mdDBcGWqeduMEZfimb9UoZE3ZArwCJD25NLc041;20:YmQGER0fFn91Kb0a3qzQ3kpBoiEpLNEd8a6UHUjpfKeGn2GEHWKfaTWPmZvC+FMLvFvCy90X47M1vM8s4WPF7br1hSRVkXmo341qrzuUWt3MqPr6gykqvDKGavZawdV4e6B3iTdS1fJqFKQmjQ4RiXxfkPirlWxZ5//Kej9KmOY= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 1eca9a1f-611f-43dd-d3c5-08d584b1535f x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1015; 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x-microsoft-antispam-message-info: qbFNLU6pUYCOL1eGSGy55L4FAQc+nNQC03npNsQ1Z+3jyuRn2nBYGxtmmJKhR4fXvDJvCORbNxi66Gq7BDEEsxyEQ/7ORy+57w23p9/4HBAUl/H4d6GYurF+wAmKaVSTMfCdOSREfjziHVzWIeW0ygLOkzsDVWVb3ORj7PT4ehhOPAWVhIFbGGcBrJF8j+XzZqalCBJiwQTtVpxxlKR4r5618YbPCVLc63EvdCWoJe19E5iuT2cOFno5JMdOhvHWH9pMq5xkEZAJiIUUgdtPJ4uumjzQ75coFiLJrOinTb0D+WLvS1LWKKpKwFL8MX8lYWj81T6SwpOmI/uq1+fsTg== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1eca9a1f-611f-43dd-d3c5-08d584b1535f X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Mar 2018 04:57:53.7583 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1015 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Brian Norris [ Upstream commit 5c9d8c4f6b8168738a26bcf288516cc3a0886810 ] We generally leave the GPIO clock disabled, unless an interrupt is requested or we're accessing IO registers. We forgot to do this for the ->get_direction() callback, which means we can sometimes [1] get incorrect results [2] from, e.g., /sys/kernel/debug/gpio. Enable the clock, so we get the right results! [1] Sometimes, because many systems have 1 or mor interrupt requested on each GPIO bank, so they always leave their clock on. [2] Incorrect, meaning the register returns 0, and so we interpret that as "input". Signed-off-by: Brian Norris Reviewed-by: Heiko Stuebner Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin --- drivers/pinctrl/pinctrl-rockchip.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-r= ockchip.c index b5cb7858ffdc..a9bc1e01f982 100644 --- a/drivers/pinctrl/pinctrl-rockchip.c +++ b/drivers/pinctrl/pinctrl-rockchip.c @@ -1989,8 +1989,16 @@ static int rockchip_gpio_get_direction(struct gpio_c= hip *chip, unsigned offset) { struct rockchip_pin_bank *bank =3D gpiochip_get_data(chip); u32 data; + int ret; =20 + ret =3D clk_enable(bank->clk); + if (ret < 0) { + dev_err(bank->drvdata->dev, + "failed to enable clock for bank %s\n", bank->name); + return ret; + } data =3D readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR); + clk_disable(bank->clk); =20 return !(data & BIT(offset)); } --=20 2.14.1