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=-13.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham 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 75722C55191 for ; Sat, 25 Apr 2020 21:26:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 515852076C for ; Sat, 25 Apr 2020 21:26:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726303AbgDYV0v convert rfc822-to-8bit (ORCPT ); Sat, 25 Apr 2020 17:26:51 -0400 Received: from mout.kundenserver.de ([217.72.192.73]:41751 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726015AbgDYV0u (ORCPT ); Sat, 25 Apr 2020 17:26:50 -0400 Received: from [192.168.1.183] ([37.4.249.134]) by mrelayeu.kundenserver.de (mreue108 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MGz9p-1jOrQh1S3H-00E4KX; Sat, 25 Apr 2020 23:26:32 +0200 Subject: Re: [PATCH v2 79/91] drm/vc4: hdmi: Deal with multiple debugfs files To: Maxime Ripard , Nicolas Saenz Julienne , Eric Anholt Cc: Tim Gover , Dave Stevenson , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, Phil Elwell , linux-arm-kernel@lists.infradead.org References: <4cd617827cc28875ef36f3632122a83cff2ea4a7.1587742492.git-series.maxime@cerno.tech> From: Stefan Wahren Autocrypt: addr=stefan.wahren@i2se.com; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tClZlcnNpb246IEdudVBHIHYy CgptUUlOQkZ0NmdCTUJFQUN1Yi9wQmV2SHhidkplZnlaRzMySklObW4yYnNFUFgyNVY2ZmVq 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Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Content-Language: en-US X-Provags-ID: V03:K1:OSGym0FgU01qHze4de3XJl9PR5eMLKF5WsjmsRA2URdvYv8swWh ivVLUDNlhPuJU+0+mLtzS/9/QA2K8Zbd5scfOEFlBZ+uBUf8xbmbdKdAZYFqMDWJjVKhIY2 Zrj7WfesnrpOTKJwp+p2chLxULDWg8iO0lPE9ZowBVArsAfEFq7BvzKhl7CtlMsIOzBtFTS PVZ4D3BE63EUTKzJDPQXQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:r9Zff1J6X8g=:Jra4JlhuveQR3R2bb/HVvM qPUYyvvY28d1SMvC6+ofvUoKnK/dz9yQdzv9xTlYJSxvMFjJFaiMvwimRMKIGlsJB/cBa06ep 4Nl6hM++TXkjI7yjMvbVhKYFJnMLvFREXlFO1f63Y3HhwE2KvHlvu+rL4hJTVbPTu5tDRwSOU oG9uKrzUKwTpPWh7I7KBeKmV4kUgu88iXIe7yOpDG9WKJeQgfL+mrhGu4nn88P8WDjUY8t77u KDRkSDyFZA85mT2Rlrc9zLdOoJXpZxq2arFsDdT6s03Rf66t3QV5qYp6TtcNq8VsomSceBoGZ eiD7Jv4Jxjk7FIo0EwqhBJUvW1eNNrrwliHSu42WczCYAtbxp6a+yR5jQV4gGvNhvgPoatqvF sqrE0dDQxC6Jl/DBu88H6mgsUOzgxm7nVaie1AFuPnmciZ46/iYOoxokKOQoRrw6XyDD3+UHz qTV3xTjPQAGm0mRumV/Y9wmi7o2wNlnsYNIJZ5oEdNIXwQ7Q/Vm13LwUcZC2BDZdSIsoNJ4FO /si5DaNXm1bhQXSoHyr69x/42XmFlS0/Brw2NL4N2sEfGNZHFjaazRj1zPJwG29HjP7l/KoiM dNuMWgr37D6uISF+HKzB3PKcAJdC86lCAPuXXAHdihUMTOy0pHlT6wcosaGFvNVlJxflOCKPi 5OCIfCBS9iMTMECIlS8/7vYWsf5WFB/RTgYVcfHlISprkygnntBUZ9X85cd36pgSqltSQ4XhB v232xF1T0rYCuUxCXeAQHkwTxNGPFKJICPntCCF45GoEWU/jaVgRb0QrwQ1Yaoz5W4rDeLDMv 8C2lkk2+HiAZAeHT1MzBxTODESU7ZTkQ7KbCew0Uva92a2eH1QGuhVddckaWrEidkEmsRb6 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Maxime, Am 24.04.20 um 17:35 schrieb Maxime Ripard: > The HDMI driver was registering a single debugfs file so far with the name > hdmi_regs. > > Obviously, this is not going to work anymore when will have multiple HDMI > controllers since we will end up trying to register two files with the same > name. > > Let's use the ID to avoid that name conflict. even with this patch there is a name conflict in debugfs using Linux 5.7-rc1. Dave Stevenson addressed this by using different card names [1]. Since this patch won't apply anymore here is my suggestion: diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 29287ab..7209397 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -1181,9 +1181,14 @@ static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)        card->dai_link = dai_link;      card->num_links = 1; -    card->name = "vc4-hdmi";      card->dev = dev;   +    if (vc4_hdmi->variant->encoder_type == VC4_ENCODER_TYPE_HDMI1) { +        card->name = "vc4-hdmi1"; +    } else { +        card->name = "vc4-hdmi"; +    } +      /*       * Be careful, snd_soc_register_card() calls dev_set_drvdata() and       * stores a pointer to the snd card object in dev->driver_data. This -- 2.7.4 [1] - https://github.com/raspberrypi/linux/pull/3515/commits/82fe6c16811e5acc9bdbbf298db1b30f84b820d2 > > Signed-off-by: Maxime Ripard > --- > drivers/gpu/drm/vc4/vc4_hdmi.c | 5 ++++- > drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +++ > 2 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c > index aaf96420d0ec..aae5b10a2d11 100644 > --- a/drivers/gpu/drm/vc4/vc4_hdmi.c > +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c > @@ -1377,7 +1377,9 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data) > if (ret) > goto err_destroy_encoder; > > - vc4_debugfs_add_file(drm, "hdmi_regs", vc4_hdmi_debugfs_regs, vc4_hdmi); > + vc4_debugfs_add_file(drm, variant->debugfs_name, > + vc4_hdmi_debugfs_regs, > + vc4_hdmi); > > return 0; > > @@ -1439,6 +1441,7 @@ static int vc4_hdmi_dev_remove(struct platform_device *pdev) > > static const struct vc4_hdmi_variant bcm2835_variant = { > .encoder_type = VC4_ENCODER_TYPE_HDMI0, > + .debugfs_name = "hdmi_regs", > .registers = vc4_hdmi_fields, > .num_registers = ARRAY_SIZE(vc4_hdmi_fields), > > diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h > index 4240c5ea7fde..22100820c81b 100644 > --- a/drivers/gpu/drm/vc4/vc4_hdmi.h > +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h > @@ -30,6 +30,9 @@ struct vc4_hdmi_variant { > /* Encoder Type for that controller */ > enum vc4_encoder_type encoder_type; > > + /* Filename to expose the registers in debugfs */ > + const char *debugfs_name; > + > /* List of the registers available on that variant */ > const struct vc4_hdmi_register *registers; >