From patchwork Fri Dec 3 10:28:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 12654723 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82842C433FE for ; Fri, 3 Dec 2021 10:31:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1380036AbhLCKe3 (ORCPT ); Fri, 3 Dec 2021 05:34:29 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:56178 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1380024AbhLCKeX (ORCPT ); Fri, 3 Dec 2021 05:34:23 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1638527459; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nJTzC5R0pf7HcncaFZoRWN5xPIE/ssJpEzpvBuVw8EE=; b=UDqPoI9Z5sPyhmb7n6WUovlEuARzx5oxmn2fhtb5oHwgRONBCEAtvnveYDKzpzyJUDy2qY /cFONZ80TiHnnn+B5NK9bko1M3ufCkK3Xm4s23drnGcH5eefsRULcekv0U+SRWftwdX/U5 MO4qCyo6gEFrNEsx+w8QsVn3T2NZkJ8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-221-XKxi5nrOOpiVz9HIIzLV1w-1; Fri, 03 Dec 2021 05:30:54 -0500 X-MC-Unique: XKxi5nrOOpiVz9HIIzLV1w-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C61CE81CCB4; Fri, 3 Dec 2021 10:30:51 +0000 (UTC) Received: from x1.localdomain.com (unknown [10.39.194.90]) by smtp.corp.redhat.com (Postfix) with ESMTP id 13A1F5BAE2; Fri, 3 Dec 2021 10:30:47 +0000 (UTC) From: Hans de Goede To: "Rafael J . Wysocki" , Mark Gross , Andy Shevchenko , Wolfram Sang , Mika Westerberg , Daniel Scally , Laurent Pinchart , Mauro Carvalho Chehab , Liam Girdwood , Mark Brown , Michael Turquette , Stephen Boyd Cc: Hans de Goede , Len Brown , linux-acpi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, Sakari Ailus , Kate Hsuan , linux-media@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH v7 12/14] media: ipu3-cio2: Defer probing until the PMIC is fully setup Date: Fri, 3 Dec 2021 11:28:55 +0100 Message-Id: <20211203102857.44539-13-hdegoede@redhat.com> In-Reply-To: <20211203102857.44539-1-hdegoede@redhat.com> References: <20211203102857.44539-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org On devices where things are not fully describe in devicetree (1) and where the code thus falls back to calling cio2_bridge_init(), the i2c-clients for any VCMs also need to be instantiated manually. The VCM can be probed by its driver as soon as the code instantiates the i2c-client and this probing must not happen before the PMIC is fully setup. Make cio2_bridge_init() return -EPROBE_DEFER when the PMIC is not fully-setup, deferring the probe of the ipu3-cio2 driver. This is a preparation patch for adding VCM enumeration support to the ipu3-cio2-bridge code. 1) Through embedding of devicetree info in the ACPI tables Signed-off-by: Hans de Goede --- Changes in v7: - Make the new cio2_bridge_sensors_are_ready() function static Changes in v6: - New patch in v6 of this patch series --- drivers/media/pci/intel/ipu3/cio2-bridge.c | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/media/pci/intel/ipu3/cio2-bridge.c b/drivers/media/pci/intel/ipu3/cio2-bridge.c index 1cbbcbf4e157..c805916d0909 100644 --- a/drivers/media/pci/intel/ipu3/cio2-bridge.c +++ b/drivers/media/pci/intel/ipu3/cio2-bridge.c @@ -308,6 +308,40 @@ static int cio2_bridge_connect_sensors(struct cio2_bridge *bridge, return ret; } +/* + * The VCM cannot be probed until the PMIC is completely setup. We cannot rely + * on -EPROBE_DEFER for this, since the consumer<->supplier relations between + * the VCM and regulators/clks are not described in ACPI, instead they are + * passed as board-data to the PMIC drivers. Since -PROBE_DEFER does not work + * for the clks/regulators the VCM i2c-clients must not be instantiated until + * the PMIC is fully setup. + * + * The sensor/VCM ACPI device has an ACPI _DEP on the PMIC, check this using the + * acpi_dev_ready_for_enumeration() helper, like the i2c-core-acpi code does + * for the sensors. + */ +static int cio2_bridge_sensors_are_ready(void) +{ + struct acpi_device *adev; + bool ready = true; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(cio2_supported_sensors); i++) { + const struct cio2_sensor_config *cfg = + &cio2_supported_sensors[i]; + + for_each_acpi_dev_match(adev, cfg->hid, NULL, -1) { + if (!adev->status.enabled) + continue; + + if (!acpi_dev_ready_for_enumeration(adev)) + ready = false; + } + } + + return ready; +} + int cio2_bridge_init(struct pci_dev *cio2) { struct device *dev = &cio2->dev; @@ -316,6 +350,9 @@ int cio2_bridge_init(struct pci_dev *cio2) unsigned int i; int ret; + if (!cio2_bridge_sensors_are_ready()) + return -EPROBE_DEFER; + bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); if (!bridge) return -ENOMEM;