From patchwork Thu Feb 16 17:27:59 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Belloni X-Patchwork-Id: 728839 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3vPNQy13Ywz9s0Z for ; Fri, 17 Feb 2017 04:28:10 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932525AbdBPR2I (ORCPT ); Thu, 16 Feb 2017 12:28:08 -0500 Received: from mail.free-electrons.com ([62.4.15.54]:49122 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932193AbdBPR2I (ORCPT ); Thu, 16 Feb 2017 12:28:08 -0500 Received: by mail.free-electrons.com (Postfix, from userid 110) id A3F372070B; Thu, 16 Feb 2017 18:28:01 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT shortcircuit=ham autolearn=disabled version=3.4.0 Received: from localhost (unknown [88.191.26.124]) by mail.free-electrons.com (Postfix) with ESMTPSA id 8030F2045B; Thu, 16 Feb 2017 18:28:01 +0100 (CET) From: Alexandre Belloni To: Wolfram Sang Cc: Ludovic Desroches , linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandre Belloni Subject: [PATCH v2] i2c: at91: ensure state is restored after suspending Date: Thu, 16 Feb 2017 18:27:59 +0100 Message-Id: <20170216172759.27837-1-alexandre.belloni@free-electrons.com> X-Mailer: git-send-email 2.11.0 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org When going to suspend, the I2C registers may be lost because the power to VDDcore is cut. Restore them when resuming. Signed-off-by: Alexandre Belloni Acked-by: Ludovic Desroches --- Changes in v2: - don't cache unecessary registers and simply call at91_init_twi_bus() drivers/i2c/busses/i2c-at91.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index 0b86c6173e07..c925a690cb32 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -1180,6 +1180,7 @@ static int at91_twi_suspend_noirq(struct device *dev) static int at91_twi_resume_noirq(struct device *dev) { + struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); int ret; if (!pm_runtime_status_suspended(dev)) { @@ -1191,6 +1192,8 @@ static int at91_twi_resume_noirq(struct device *dev) pm_runtime_mark_last_busy(dev); pm_request_autosuspend(dev); + at91_init_twi_bus(twi_dev); + return 0; }