From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0063AC33CA9 for ; Tue, 14 Jan 2020 07:16:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C2375222C3 for ; Tue, 14 Jan 2020 07:16:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="nyrwVyLc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728890AbgANHQk (ORCPT ); Tue, 14 Jan 2020 02:16:40 -0500 Received: from mail-pg1-f195.google.com ([209.85.215.195]:33139 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729030AbgANHQY (ORCPT ); Tue, 14 Jan 2020 02:16:24 -0500 Received: by mail-pg1-f195.google.com with SMTP id 6so5981955pgk.0 for ; Mon, 13 Jan 2020 23:16:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=kL7MaPtbEc21MOhREjvhOgoDbupsHbrcTaafCHl6zWw=; b=nyrwVyLcYnNR5mbm92LNGb5QtmCx+5pUoIH0aD8TvRWaA/To6hN3kVrNsRDENiENh9 y1BPUp40uFVRbuMzqrcmBYs+eWomH0z/SV1EzZnxa4zl0EM3jf+TUHwBnkr03hwwPk4+ rmBcnoqFF80mCeo3ILegZQxvfm8H/5T97yIao= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=kL7MaPtbEc21MOhREjvhOgoDbupsHbrcTaafCHl6zWw=; b=mbDIYouBZBJb/MErQ2YKeKLcHCevBuLKGtgLCRQJtXB7Cs/V2FaZx97eMnmeI8mzZf jG5BVuSagrrK1Sh4j/doM0AV9hO2+B/1XHDZMeWt1MtjreNMG0yrPEMwNas6gO2Ptm2U O9pnJMcDcDgh+a7veUifwnJL+NbdCr+AwA+V5raQ0paQWemSH/qqRRzaeugTBX5sNorI cY6/VUHq+WgAnj15BWTDXAZCaTAyvkNPoN8I8eYTzSg+K3ztkoR1kgXuBLlgjSGghaY3 ut8OlUQSU/TETJcqnPuIypO/qiwGF9Q2V4O+DCsJ15qBr0uvE1pJOnAKtXHJ7A9tBF5T fyAQ== X-Gm-Message-State: APjAAAVBlIamgETe9TyNqFUklU59wd11CDFZ9liIBi4qZ9rR3S2abduF TXdquBypMKEb9XgnVs3ihfG8LA== X-Google-Smtp-Source: APXvYqz1Db5nZXfVgPpUvk0sMU7jCh8DwGo6ABq63Sc0zluJCZpvIMzGYhdDt6IlBlStywedDMXynA== X-Received: by 2002:a63:d62:: with SMTP id 34mr26391053pgn.268.1578986183441; Mon, 13 Jan 2020 23:16:23 -0800 (PST) Received: from drinkcat2.tpe.corp.google.com ([2401:fa00:1:b:d8b7:33af:adcb:b648]) by smtp.gmail.com with ESMTPSA id b4sm17092976pfd.18.2020.01.13.23.16.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jan 2020 23:16:22 -0800 (PST) From: Nicolas Boichat To: Rob Herring Cc: David Airlie , Daniel Vetter , Mark Rutland , Matthias Brugger , Tomeu Vizoso , Steven Price , Alyssa Rosenzweig , Liam Girdwood , Mark Brown , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, hsinyi@chromium.org Subject: [PATCH v3 5/7] drm/panfrost: Add support for multiple power domains Date: Tue, 14 Jan 2020 15:16:00 +0800 Message-Id: <20200114071602.47627-6-drinkcat@chromium.org> X-Mailer: git-send-email 2.25.0.rc1.283.g88dfdc4193-goog In-Reply-To: <20200114071602.47627-1-drinkcat@chromium.org> References: <20200114071602.47627-1-drinkcat@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org When there is a single power domain per device, the core will ensure the power domain is switched on (so it is technically equivalent to having not power domain specified at all). However, when there are multiple domains, as in MT8183 Bifrost GPU, we need to handle them in driver code. Signed-off-by: Nicolas Boichat --- The downstream driver we use on chromeos-4.19 currently uses 2 additional devices in device tree to accomodate for this [1], but I believe this solution is cleaner. [1] https://chromium.googlesource.com/chromiumos/third_party/kernel/+/refs/heads/chromeos-4.19/drivers/gpu/arm/midgard/platform/mediatek/mali_kbase_runtime_pm.c#31 v3: - Use the compatible matching data to specify the number of power domains. Note that setting 0 or 1 in num_pm_domains is equivalent as the core will handle these 2 cases in the exact same way (automatically, without driver intervention), and there should be no adverse consequence in this case (the concern is about switching on only some power domains and not others). drivers/gpu/drm/panfrost/panfrost_device.c | 95 ++++++++++++++++++++-- drivers/gpu/drm/panfrost/panfrost_device.h | 9 ++ drivers/gpu/drm/panfrost/panfrost_drv.c | 1 + 3 files changed, 97 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c index c30e0a3772a4f57..7c9766f76cc7689 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.c +++ b/drivers/gpu/drm/panfrost/panfrost_device.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include "panfrost_device.h" @@ -119,6 +120,75 @@ static void panfrost_regulator_fini(struct panfrost_device *pfdev) pfdev->regulators); } +static void panfrost_pm_domain_fini(struct panfrost_device *pfdev) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(pfdev->pm_domain_devs); i++) { + if (!pfdev->pm_domain_devs[i]) + break; + + if (pfdev->pm_domain_links[i]) + device_link_del(pfdev->pm_domain_links[i]); + + dev_pm_domain_detach(pfdev->pm_domain_devs[i], true); + } +} + +static int panfrost_pm_domain_init(struct panfrost_device *pfdev) +{ + int err; + int i, num_domains; + + num_domains = of_count_phandle_with_args(pfdev->dev->of_node, + "power-domains", + "#power-domain-cells"); + + /* + * Single domain is handled by the core, and, if only a single power + * the power domain is requested, the property is optional. + */ + if (num_domains < 2 && pfdev->comp->num_pm_domains < 2) + return 0; + + if (num_domains != pfdev->comp->num_pm_domains) { + dev_err(pfdev->dev, + "Incorrect number of power domains: %d provided, %d needed\n", + num_domains, pfdev->comp->num_pm_domains); + return -EINVAL; + } + + BUG_ON(num_domains > ARRAY_SIZE(pfdev->pm_domain_devs)); + + for (i = 0; i < num_domains; i++) { + pfdev->pm_domain_devs[i] = + dev_pm_domain_attach_by_id(pfdev->dev, i); + if (IS_ERR(pfdev->pm_domain_devs[i])) { + err = PTR_ERR(pfdev->pm_domain_devs[i]); + pfdev->pm_domain_devs[i] = NULL; + dev_err(pfdev->dev, + "failed to get pm-domain %d: %d\n", i, err); + goto err; + } + + pfdev->pm_domain_links[i] = device_link_add(pfdev->dev, + pfdev->pm_domain_devs[i], DL_FLAG_PM_RUNTIME | + DL_FLAG_STATELESS | DL_FLAG_RPM_ACTIVE); + if (!pfdev->pm_domain_links[i]) { + dev_err(pfdev->pm_domain_devs[i], + "adding device link failed!\n"); + err = -ENODEV; + goto err; + } + } + + return 0; + +err: + panfrost_pm_domain_fini(pfdev); + return err; +} + int panfrost_device_init(struct panfrost_device *pfdev) { int err; @@ -149,37 +219,45 @@ int panfrost_device_init(struct panfrost_device *pfdev) goto err_out1; } + err = panfrost_pm_domain_init(pfdev); + if (err) { + dev_err(pfdev->dev, "pm_domain init failed %d\n", err); + goto err_out2; + } + res = platform_get_resource(pfdev->pdev, IORESOURCE_MEM, 0); pfdev->iomem = devm_ioremap_resource(pfdev->dev, res); if (IS_ERR(pfdev->iomem)) { dev_err(pfdev->dev, "failed to ioremap iomem\n"); err = PTR_ERR(pfdev->iomem); - goto err_out2; + goto err_out3; } err = panfrost_gpu_init(pfdev); if (err) - goto err_out2; + goto err_out3; err = panfrost_mmu_init(pfdev); if (err) - goto err_out3; + goto err_out4; err = panfrost_job_init(pfdev); if (err) - goto err_out4; + goto err_out5; err = panfrost_perfcnt_init(pfdev); if (err) - goto err_out5; + goto err_out6; return 0; -err_out5: +err_out6: panfrost_job_fini(pfdev); -err_out4: +err_out5: panfrost_mmu_fini(pfdev); -err_out3: +err_out4: panfrost_gpu_fini(pfdev); +err_out3: + panfrost_pm_domain_fini(pfdev); err_out2: panfrost_reset_fini(pfdev); err_out1: @@ -196,6 +274,7 @@ void panfrost_device_fini(struct panfrost_device *pfdev) panfrost_mmu_fini(pfdev); panfrost_gpu_fini(pfdev); panfrost_reset_fini(pfdev); + panfrost_pm_domain_fini(pfdev); panfrost_regulator_fini(pfdev); panfrost_clk_fini(pfdev); } diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h index 021f063ffb3747f..143eab57180a2e1 100644 --- a/drivers/gpu/drm/panfrost/panfrost_device.h +++ b/drivers/gpu/drm/panfrost/panfrost_device.h @@ -21,6 +21,7 @@ struct panfrost_perfcnt; #define NUM_JOB_SLOTS 3 #define MAX_REGULATORS 2 +#define MAX_PM_DOMAINS 3 struct panfrost_features { u16 id; @@ -61,6 +62,11 @@ struct panfrost_compatible { /* Supplies count and names. */ int num_supplies; const char * const *supply_names; + /* + * Number of power domains required, note that values 0 and 1 are + * handled identically, as only values > 1 need special handling. + */ + int num_pm_domains; }; struct panfrost_device { @@ -73,6 +79,9 @@ struct panfrost_device { struct clk *bus_clock; struct regulator_bulk_data regulators[MAX_REGULATORS]; struct reset_control *rstc; + /* pm_domains for devices with more than one. */ + struct device *pm_domain_devs[MAX_PM_DOMAINS]; + struct device_link *pm_domain_links[MAX_PM_DOMAINS]; struct panfrost_features features; const struct panfrost_compatible* comp; diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c index db3563b80150c9d..42b87e29e605149 100644 --- a/drivers/gpu/drm/panfrost/panfrost_drv.c +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c @@ -589,6 +589,7 @@ const char * const default_supplies[] = { "mali" }; static const struct panfrost_compatible default_data = { .num_supplies = ARRAY_SIZE(default_supplies), .supply_names = default_supplies, + .num_pm_domains = 1, /* optional */ }; static const struct of_device_id dt_match[] = { -- 2.25.0.rc1.283.g88dfdc4193-goog