From patchwork Mon Feb 27 09:38:30 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 732742 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 3vWy5D3yt9z9sN1 for ; Mon, 27 Feb 2017 21:05:36 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752027AbdB0KFe (ORCPT ); Mon, 27 Feb 2017 05:05:34 -0500 Received: from mx1.redhat.com ([209.132.183.28]:41468 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751660AbdB0KFc (ORCPT ); Mon, 27 Feb 2017 05:05:32 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B892E61B9C; Mon, 27 Feb 2017 09:38:39 +0000 (UTC) Received: from shalem.localdomain.com (ovpn-116-43.ams2.redhat.com [10.36.116.43]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v1R9cVNr003486; Mon, 27 Feb 2017 04:38:37 -0500 From: Hans de Goede To: Jarkko Nikula , Wolfram Sang , Len Brown , Andy Shevchenko Cc: Hans de Goede , Mika Westerberg , Jani Nikula , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Takashi Iwai , "russianneuromancer @ ya . ru" , linux-i2c@vger.kernel.org, intel-gfx Subject: [PATCH 2/2] i2c: designware: Disable pm for PMIC i2c-bus even if there is no _SEM method Date: Mon, 27 Feb 2017 10:38:30 +0100 Message-Id: <20170227093830.3416-3-hdegoede@redhat.com> In-Reply-To: <20170227093830.3416-1-hdegoede@redhat.com> References: <20170227093830.3416-1-hdegoede@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Mon, 27 Feb 2017 09:38:39 +0000 (UTC) Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Cherrytrail devices use the dw i2c-bus with uid 7 to access their PMIC. Even if the i2c-bus to the PMIC is not shared with the SoC's P-Unit and i2c-designware-baytrail.c thus does not set the pm_disabled flag, we still need to disable pm so that ACPI PMIC opregions can access the PMIC during late-suspend and early-resume. This fixes errors like these blocking suspend: i2c_designware 808622C1:06: timeout waiting for bus ready ACPI Exception: AE_ERROR, Returned by Handler for [UserDefinedRegion] acpi 80860F14:02: Failed to change power state to D3hot PM: late suspend of devices failed Signed-off-by: Hans de Goede --- drivers/i2c/busses/i2c-designware-platdrv.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 8ed96dd..08d609e 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -94,7 +94,10 @@ static void dw_i2c_acpi_params(struct platform_device *pdev, char method[], static int dw_i2c_acpi_configure(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + acpi_handle handle = ACPI_HANDLE(&pdev->dev); const struct acpi_device_id *id; + struct acpi_device *adev; + const char *uid; dev->adapter.nr = -1; dev->tx_fifo_depth = 32; @@ -114,6 +117,18 @@ static int dw_i2c_acpi_configure(struct platform_device *pdev) if (id && id->driver_data) dev->flags |= (u32)id->driver_data; + if (acpi_bus_get_device(handle, &adev)) + return -ENODEV; + + /* + * Cherrytrail I2C7 gets used for the PMIC which gets accessed + * through ACPI opregions during late suspend / early resume + * disable pm for it. + */ + uid = adev->pnp.unique_id; + if ((dev->flags & MODEL_CHERRYTRAIL) && !strcmp(uid, "7")) + dev->pm_disabled = true; + return 0; }