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=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 50014C352A4 for ; Mon, 10 Feb 2020 11:39:20 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 205E920733 for ; Mon, 10 Feb 2020 11:39:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="F46xrshH" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 205E920733 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:To:Subject:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=8dro6iVpzGNG+VqKle5rRtrNOAzLRusZISPiG3JTdXI=; b=F46xrshHajil0V Tr5Uw1ik8PBj6j1H9TE+RMNkt3Sg2oDWbjOZJU0e/hMP+0Uwpzuc6j5Li323GJjHqq4KPPxK5o6Fu gQxyUVjvw9WnO7mzGVZk2rK/fcSt5vMMwA+N8RJM1OIlDvf6T+narPHqrFb3R4pvRsVLc30YVhs1i JqA0kq8V8JYpiKmFWYbuHT01273kRycjBVoNUjjUsCaP//0vGqcR5bdBrVfJFcbwfaHeWL8YSacut l4Z3UC5Bs2rJQP43050syeedUC/tCd+38CryAa/9d6YB0pIsI3cQdj9Crl8zDyVhp3lALDI68r6hk 9D/RbE8OjSCkLGX7gf1w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j17PF-0004FU-6m; Mon, 10 Feb 2020 11:39:13 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j17P7-0004A7-T9; Mon, 10 Feb 2020 11:39:07 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F24D71FB; Mon, 10 Feb 2020 03:39:04 -0800 (PST) Received: from [10.1.195.32] (e112269-lin.cambridge.arm.com [10.1.195.32]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3EA253F6CF; Mon, 10 Feb 2020 03:39:02 -0800 (PST) Subject: Re: [PATCH v4 5/7] drm/panfrost: Add support for multiple power domains To: Nicolas Boichat , Rob Herring References: <20200207052627.130118-1-drinkcat@chromium.org> <20200207052627.130118-6-drinkcat@chromium.org> From: Steven Price Message-ID: Date: Mon, 10 Feb 2020 11:39:01 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200207052627.130118-6-drinkcat@chromium.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200210_033906_030656_4B523BD0 X-CRM114-Status: GOOD ( 30.62 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , "devicetree@vger.kernel.org" , "ulf.hansson@linaro.org" , Tomeu Vizoso , David Airlie , Liam Girdwood , "dri-devel@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , Mark Brown , "linux-mediatek@lists.infradead.org" , Alyssa Rosenzweig , Daniel Vetter , "hsinyi@chromium.org" , Matthias Brugger , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On 07/02/2020 05:26, Nicolas Boichat wrote: > 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 LGTM! Reviewed-by: Steven Price Thanks, Steve > > --- > > 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 > > v4: > - Match the exact power domain names as specified in the compatible > struct, instead of just matching the number of power domains. > [Review: Ulf Hansson] > - Dropped print and reordered function [Review: Steven Price] > - nits: Run through latest version of checkpatch: > - Use WARN instead of BUG_ON. > - Drop braces for single expression if block. > 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 | 97 ++++++++++++++++++++-- > drivers/gpu/drm/panfrost/panfrost_device.h | 11 +++ > drivers/gpu/drm/panfrost/panfrost_drv.c | 2 + > 3 files changed, 102 insertions(+), 8 deletions(-) > > diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c > index 3720d50f6d9f965..8136babd3ba9935 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" > @@ -120,6 +121,79 @@ 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; > + } > + > + if (WARN(num_domains > ARRAY_SIZE(pfdev->pm_domain_devs), > + "Too many supplies in compatible structure.\n")) > + return -EINVAL; > + > + for (i = 0; i < num_domains; i++) { > + pfdev->pm_domain_devs[i] = > + dev_pm_domain_attach_by_name(pfdev->dev, > + pfdev->comp->pm_domain_names[i]); > + if (IS_ERR_OR_NULL(pfdev->pm_domain_devs[i])) { > + err = PTR_ERR(pfdev->pm_domain_devs[i]) ? : -ENODATA; > + pfdev->pm_domain_devs[i] = NULL; > + dev_err(pfdev->dev, > + "failed to get pm-domain %s(%d): %d\n", > + pfdev->comp->pm_domain_names[i], 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; > @@ -150,37 +224,43 @@ int panfrost_device_init(struct panfrost_device *pfdev) > goto err_out1; > } > > + err = panfrost_pm_domain_init(pfdev); > + if (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 +276,7 @@ void panfrost_device_fini(struct panfrost_device *pfdev) > panfrost_job_fini(pfdev); > panfrost_mmu_fini(pfdev); > panfrost_gpu_fini(pfdev); > + panfrost_pm_domain_fini(pfdev); > panfrost_reset_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 c9468bc5573ac9d..c30c719a805940a 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 +62,13 @@ 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; > + /* Only required if num_pm_domains > 1. */ > + const char * const *pm_domain_names; > }; > > struct panfrost_device { > @@ -73,6 +81,9 @@ 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 4d08507526239f2..a6e162236d67fdf 100644 > --- a/drivers/gpu/drm/panfrost/panfrost_drv.c > +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c > @@ -663,6 +663,8 @@ 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 */ > + .pm_domain_names = NULL, > }; > > static const struct of_device_id dt_match[] = { > _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek