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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 4D534C4361A for ; Fri, 16 Apr 2021 09:01:01 +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 E970861166 for ; Fri, 16 Apr 2021 09:01:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E970861166 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de 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 871406EB41; Fri, 16 Apr 2021 09:00:57 +0000 (UTC) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3CBFB6EB3E for ; Fri, 16 Apr 2021 09:00:56 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id C1692AF38; Fri, 16 Apr 2021 09:00:54 +0000 (UTC) From: Thomas Zimmermann To: daniel@ffwll.ch, airlied@linux.ie, maarten.lankhorst@linux.intel.com, mripard@kernel.org, kraxel@redhat.com, corbet@lwn.net, lgirdwood@gmail.com, broonie@kernel.org, sam@ravnborg.org, robh@kernel.org, emil.l.velikov@gmail.com, geert+renesas@glider.be, hdegoede@redhat.com, bluescreen_avenger@verizon.net, gregkh@linuxfoundation.org Subject: [PATCH v4 7/9] drm/simpledrm: Acquire clocks from DT device node Date: Fri, 16 Apr 2021 11:00:46 +0200 Message-Id: <20210416090048.11492-8-tzimmermann@suse.de> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210416090048.11492-1-tzimmermann@suse.de> References: <20210416090048.11492-1-tzimmermann@suse.de> 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: virtualization@lists.linux-foundation.org, Thomas Zimmermann , dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Make sure required hardware clocks are enabled while the firmware framebuffer is in use. The basic code has been taken from the simplefb driver and adapted to DRM. Clocks are released automatically via devres helpers. Signed-off-by: Thomas Zimmermann Tested-by: nerdopolis --- drivers/gpu/drm/tiny/simpledrm.c | 108 +++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c index 53d6bec7d0b2..996318500abf 100644 --- a/drivers/gpu/drm/tiny/simpledrm.c +++ b/drivers/gpu/drm/tiny/simpledrm.c @@ -1,5 +1,7 @@ // SPDX-License-Identifier: GPL-2.0-only +#include +#include #include #include @@ -190,6 +192,12 @@ struct simpledrm_device { struct drm_device dev; struct platform_device *pdev; + /* clocks */ +#if defined CONFIG_OF && defined CONFIG_COMMON_CLK + unsigned int clk_count; + struct clk **clks; +#endif + /* simplefb settings */ struct drm_display_mode mode; const struct drm_format_info *format; @@ -211,6 +219,103 @@ static struct simpledrm_device *simpledrm_device_of_dev(struct drm_device *dev) return container_of(dev, struct simpledrm_device, dev); } +/* + * Hardware + */ + +#if defined CONFIG_OF && defined CONFIG_COMMON_CLK +/* + * Clock handling code. + * + * Here we handle the clocks property of our "simple-framebuffer" dt node. + * This is necessary so that we can make sure that any clocks needed by + * the display engine that the bootloader set up for us (and for which it + * provided a simplefb dt node), stay up, for the life of the simplefb + * driver. + * + * When the driver unloads, we cleanly disable, and then release the clocks. + * + * We only complain about errors here, no action is taken as the most likely + * error can only happen due to a mismatch between the bootloader which set + * up simplefb, and the clock definitions in the device tree. Chances are + * that there are no adverse effects, and if there are, a clean teardown of + * the fb probe will not help us much either. So just complain and carry on, + * and hope that the user actually gets a working fb at the end of things. + */ + +static void simpledrm_device_release_clocks(void *res) +{ + struct simpledrm_device *sdev = simpledrm_device_of_dev(res); + unsigned int i; + + for (i = 0; i < sdev->clk_count; ++i) { + if (sdev->clks[i]) { + clk_disable_unprepare(sdev->clks[i]); + clk_put(sdev->clks[i]); + } + } +} + +static int simpledrm_device_init_clocks(struct simpledrm_device *sdev) +{ + struct drm_device *dev = &sdev->dev; + struct platform_device *pdev = sdev->pdev; + struct device_node *of_node = pdev->dev.of_node; + struct clk *clock; + unsigned int i; + int ret; + + if (dev_get_platdata(&pdev->dev) || !of_node) + return 0; + + sdev->clk_count = of_clk_get_parent_count(of_node); + if (!sdev->clk_count) + return 0; + + sdev->clks = drmm_kzalloc(dev, sdev->clk_count * sizeof(sdev->clks[0]), + GFP_KERNEL); + if (!sdev->clks) + return -ENOMEM; + + for (i = 0; i < sdev->clk_count; ++i) { + clock = of_clk_get(of_node, i); + if (IS_ERR(clock)) { + ret = PTR_ERR(clock); + if (ret == -EPROBE_DEFER) + goto err; + drm_err(dev, "clock %u not found: %d\n", i, ret); + continue; + } + ret = clk_prepare_enable(clock); + if (ret) { + drm_err(dev, "failed to enable clock %u: %d\n", + i, ret); + clk_put(clock); + } + sdev->clks[i] = clock; + } + + return devm_add_action_or_reset(&pdev->dev, + simpledrm_device_release_clocks, + sdev); + +err: + while (i) { + --i; + if (sdev->clks[i]) { + clk_disable_unprepare(sdev->clks[i]); + clk_put(sdev->clks[i]); + } + } + return ret; +} +#else +static int simpledrm_device_init_clocks(struct simpledrm_device *sdev) +{ + return 0; +} +#endif + /* * Simplefb settings */ @@ -552,6 +657,9 @@ simpledrm_device_create(struct drm_driver *drv, struct platform_device *pdev) sdev->pdev = pdev; platform_set_drvdata(pdev, sdev); + ret = simpledrm_device_init_clocks(sdev); + if (ret) + return ERR_PTR(ret); ret = simpledrm_device_init_fb(sdev); if (ret) return ERR_PTR(ret); -- 2.31.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel