From patchwork Tue Jan 14 07:16:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Boichat X-Patchwork-Id: 11331355 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2878813BD for ; Tue, 14 Jan 2020 07:16:26 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 06C22222C3 for ; Tue, 14 Jan 2020 07:16:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="nyrwVyLc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 06C22222C3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 08CCC6E2CD; Tue, 14 Jan 2020 07:16:25 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-pf1-x443.google.com (mail-pf1-x443.google.com [IPv6:2607:f8b0:4864:20::443]) by gabe.freedesktop.org (Postfix) with ESMTPS id EC65D6E2CD for ; Tue, 14 Jan 2020 07:16:23 +0000 (UTC) Received: by mail-pf1-x443.google.com with SMTP id n9so6124555pff.13 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=jywU6oR7C3ldX36n8reeyk1KUkBHzwI22OjI7MK9JfMBal8OA2wXU/DdWerqNFd4Ke Jw9lTLuIqfVYDoj0Nga5pRn7R3NmMzw6C4yQFzQjm2Ns0+/kukJ8K5OSmJdHSdOqpOk1 GTEA185W+Mtf3QYWpn/v2TJD9lMUoIIev+R7bgUQyewHHT8ozKYQQ1ALw6+Q/QqxpSs0 uHnFGDTsZ1bTFAxryI74lkpzGXrHeum9CqPD7cQ8PLqZkP2os1h7PSZq3vjXdvccxs5x dl33tWtpieGWGpZB6ZlQg7FXtJXTuAT5X5DYUSS390NdRaxkwsxbSlP+IezhexFDbBtm +P2A== X-Gm-Message-State: APjAAAXrFSfhIKwpZ4/dw47fdquhNZNVLiDs7KO8cwqq8yPm1S8MZzRR a84lzRKFzAG877URVIrstNHOGw== 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 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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Tomeu Vizoso , David Airlie , linux-kernel@vger.kernel.org, Liam Girdwood , dri-devel@lists.freedesktop.org, Steven Price , Mark Brown , linux-mediatek@lists.infradead.org, Alyssa Rosenzweig , hsinyi@chromium.org, Matthias Brugger , linux-arm-kernel@lists.infradead.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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[] = {