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=-12.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 77A19C433E1 for ; Sat, 16 May 2020 10:11:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58DA32076A for ; Sat, 16 May 2020 10:11:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589623870; bh=XU1twUeDe4eMoZ1m0cNMv2o1iM76zQrLkGTJXb+AACA=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=DSyq3OLqPhRFaRU6wwVbxO/8IC6r3noGnCj5IfBUviYxJ7ZUJg/DxlFzr5IWSccZu bNKfLDOynMFmOSgVrMQuPnZ9UNVFEIFjH8+3FTZJjUgwmgJlm+A7FsShz42ZSh3Gyr RUnWYQNgVJNiKsj+r2Kk3w7V4FA1L4WpHS8NO2KU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726263AbgEPKLB (ORCPT ); Sat, 16 May 2020 06:11:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:57406 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725792AbgEPKLB (ORCPT ); Sat, 16 May 2020 06:11:01 -0400 Received: from mail-ej1-f50.google.com (mail-ej1-f50.google.com [209.85.218.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 414B2207F5 for ; Sat, 16 May 2020 10:11:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589623860; bh=XU1twUeDe4eMoZ1m0cNMv2o1iM76zQrLkGTJXb+AACA=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=LhLCJDAL0fNfflOdG/9eckydIkq/pxQDSPOuvwX2xtZX0YydzN3q+55SdL8jLFUJf 9RFxrNQ7lpHFyhXzSJRzOeZTuQ5IwkfulkNxFAP9r70s3VqSETeNtGSQnf8qpsVq7r pBbyqUDkqjoBFDx0njrJ1jdquUCSkHkP7WPi+1Ec= Received: by mail-ej1-f50.google.com with SMTP id x1so4408778ejd.8 for ; Sat, 16 May 2020 03:11:00 -0700 (PDT) X-Gm-Message-State: AOAM533brbqLN+49UMdfLmidc8clOUthiISUsIZP0bGoM+51jDgcPE0k 1hxHcYi8z1aPfUQmL6l59IrqUV7ehwFhmoQwig== X-Google-Smtp-Source: ABdhPJwvZ8w+iX3fL8kbrpnlBQ7nXKFx8Y1EtQ19L0cdysqc+LfEj/7Pb+OD711IvGi1JSb1fwswDRnCiVSuKx6RNVU= X-Received: by 2002:a17:906:7717:: with SMTP id q23mr6957899ejm.38.1589623858510; Sat, 16 May 2020 03:10:58 -0700 (PDT) MIME-Version: 1.0 References: <20200501152335.1805790-1-enric.balletbo@collabora.com> <20200501152335.1805790-8-enric.balletbo@collabora.com> <53683f2d-23c7-57ab-2056-520c50795ffe@collabora.com> <37191700-5832-2931-5764-7f7fddd023b9@collabora.com> In-Reply-To: From: Chun-Kuang Hu Date: Sat, 16 May 2020 18:10:46 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v4 7/7] drm/mediatek: mtk_dsi: Create connector for bridges To: Enric Balletbo i Serra Cc: Chun-Kuang Hu , Enric Balletbo Serra , linux-kernel , Collabora Kernel ML , Nicolas Boichat , Philipp Zabel , David Airlie , dri-devel , "moderated list:ARM/Mediatek SoC support" , Laurent Pinchart , Daniel Vetter , Hsin-Yi Wang , Matthias Brugger , Sam Ravnborg , Linux ARM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Enric: Enric Balletbo i Serra =E6=96=BC 2020=E5=B9= =B45=E6=9C=8815=E6=97=A5 =E9=80=B1=E4=BA=94 =E4=B8=8A=E5=8D=881:35=E5=AF=AB= =E9=81=93=EF=BC=9A > > Hi again, > > On 14/5/20 19:12, Enric Balletbo i Serra wrote: > > Hi Chun-Kuang, > > > > On 14/5/20 18:44, Chun-Kuang Hu wrote: > >> Hi, Enric: > >> > >> Enric Balletbo i Serra =E6=96=BC 2020= =E5=B9=B45=E6=9C=8814=E6=97=A5 =E9=80=B1=E5=9B=9B =E4=B8=8B=E5=8D=8811:42= =E5=AF=AB=E9=81=93=EF=BC=9A > >>> > >>> Hi Chun-Kuang, > >>> > >>> On 14/5/20 16:28, Chun-Kuang Hu wrote: > >>>> Hi, Enric: > >>>> > >>>> Enric Balletbo Serra =E6=96=BC 2020=E5=B9=B45= =E6=9C=8814=E6=97=A5 =E9=80=B1=E5=9B=9B =E4=B8=8A=E5=8D=8812:41=E5=AF=AB=E9= =81=93=EF=BC=9A > >>>>> > >>>>> Hi Chun-Kuang, > >>>>> > >>>>> Missatge de Enric Balletbo i Serra d= el > >>>>> dia dv., 1 de maig 2020 a les 17:25: > >>>>>> > >>>>>> Use the drm_bridge_connector helper to create a connector for pipe= lines > >>>>>> that use drm_bridge. This allows splitting connector operations ac= ross > >>>>>> multiple bridges when necessary, instead of having the last bridge= in > >>>>>> the chain creating the connector and handling all connector operat= ions > >>>>>> internally. > >>>>>> > >>>>>> Signed-off-by: Enric Balletbo i Serra > >>>>>> Acked-by: Sam Ravnborg > >>>>> > >>>>> A gentle ping on this, I think that this one is the only one that > >>>>> still needs a review in the series. > >>>> > >>>> This is what I reply in patch v3: > >>>> > >>> > >>> Sorry for missing this. > >>> > >>>> I think the panel is wrapped into next_bridge here, > >>>> > >>> > >>> Yes, you can have for example: > >>> > >>> 1. drm_bridge (mtk_dsi) -> drm_bridge (ps8640 - dsi-to-edp) -> drm_pa= nel_bridge > >>> (edp panel) > >>> > >>> or a > >>> > >>> 2. drm_bridge (mtk_dsi)-> drm_panel_bridge (dsi panel) > >>> > >>> The _first_ one is my use case > >>> > >>>> if (panel) { > >>> > >>> This handles the second case, where you attach a dsi panel. > >>> > >>>> dsi->next_bridge =3D devm_drm_panel_bridge_add(dev, panel); > >>>> > >>>> so the next_bridge is a panel_bridge, in its attach function > >>>> panel_bridge_attach(), > >>>> according to the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR, if not exist, > >>>> it would create connector and attach connector to panel. > >>>> > >>>> I'm not sure this flag would exist or not, but for both case, it's s= trange. > >>>> If exist, you create connector in this patch but no where to attach > >>>> connector to panel. > >>> > >>> Yes, in fact, this is transitional patch needed, as once I converted = mtk_dpi, > >>> mtk_dsi and mtk_hdmi to the new drm_bridge API the drm_bridge_connect= or_init() > >>> will be done in mtk_drm_drv. We will need to call drm_bridge_connecto= r_init for > >>> dpi and dsi pipes and remove that call from mtk_dsi and mtk_dpi drive= rs. The > >>> graphic controller driver should create connectors and CRTCs, as exam= ple you can > >>> take a look at drivers/gpu/drm/omapdrm/omap_drv.c > >>> > >> > >> I have such question because I've reviewed omap's driver. In omap's > >> driver, after it call drm_bridge_connector_init(), it does this: > >> > >> if (pipe->output->panel) { > >> ret =3D drm_panel_attach(pipe->output->panel, > >> pipe->connector); > >> if (ret < 0) > >> return ret; > >> } > >> > >> In this patch, you does not do this. > >> > > > > I see, so yes, I am probably missing call drm_panel_attach in case ther= e is a > > direct panel attached. Thanks for pointing it. > > > > I'll send a new version adding the drm_panel_attach call. > > > > Wait, shouldn't panel be attached on the call of mtk_dsi_bridge_attach as > next_bridge points to a bridge or a panel? > > static int mtk_dsi_bridge_attach(struct drm_bridge *bridge, > enum drm_bridge_attach_flags flags) > { > struct mtk_dsi *dsi =3D bridge_to_dsi(bridge); > > /* Attach the panel or bridge to the dsi bridge */ > return drm_bridge_attach(bridge->encoder, dsi->next_bridge, > &dsi->bridge, flags); > } > > Or I am continuing misunderstanding all this? > My point is: when do you attach panel to a connector? In this patch, ret =3D drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR); it would call into mtk_dsi_bridge_attach() with DRM_BRIDGE_ATTACH_NO_CONNECTOR, and call into panel_bridge_attach() with DRM_BRIDGE_ATTACH_NO_CONNECTOR. If you does not pass DRM_BRIDGE_ATTACH_NO_CONNECTOR into panel_bridge_attach(), it would create a connector and attach panel to that connector. And you pass DRM_BRIDGE_ATTACH_NO_CONNECTOR into panel_bridge_attach(), so I thiink you need to create connector and attach panel to that connector by yourself (this is what omap does). Regards, Chun-Kuang. > >>>> If not exist, the next_brige would create one connector and this bri= ge > >>>> would create another connector. > >>>> > >>>> I think in your case, mtk_dsi does not directly connect to a panel, = so > >>> > >>> Exactly > >>> > >>>> I need a exact explain. Or someone could test this on a > >>>> directly-connect-panel platform. > >>> > >>> I don't think I am breaking this use case but AFAICS there is no user= s in > >>> mainline that directly connect a panel using the mediatek driver. As = I said my > >>> use case is the other so I can't really test. Do you know anyone that= can test this? > >> > >> I'm not sure who can test this, but [1], which is sent by YT Shen in a > >> series, is a patch to support dsi command mode so dsi could directly > >> connect to panel. > >> > >> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git= /commit/drivers/gpu/drm/mediatek?h=3Dv5.7-rc5&id=3D21898816831fc60c92dd634a= b4316a24da7eb4af > >> > >> It's better that someone could test this case, but if no one would > >> test this, I could also accept a good-look patch. > >> > >> Regards, > >> Chun-Kuang. > >> > >>> > >>> Thanks, > >>> Enric > >>> > >>>> > >>>> Regards, > >>>> Chun-Kuang. > >>>> > >>>>> > >>>>> Thanks, > >>>>> Enric > >>>>> > >>>>>> --- > >>>>>> > >>>>>> Changes in v4: None > >>>>>> Changes in v3: > >>>>>> - Move the bridge.type line to the patch that adds drm_bridge supp= ort. (Laurent Pinchart) > >>>>>> > >>>>>> Changes in v2: None > >>>>>> > >>>>>> drivers/gpu/drm/mediatek/mtk_dsi.c | 13 ++++++++++++- > >>>>>> 1 file changed, 12 insertions(+), 1 deletion(-) > >>>>>> > >>>>>> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/= mediatek/mtk_dsi.c > >>>>>> index 4f3bd095c1ee..471fcafdf348 100644 > >>>>>> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c > >>>>>> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c > >>>>>> @@ -17,6 +17,7 @@ > >>>>>> > >>>>>> #include > >>>>>> #include > >>>>>> +#include > >>>>>> #include > >>>>>> #include > >>>>>> #include > >>>>>> @@ -183,6 +184,7 @@ struct mtk_dsi { > >>>>>> struct drm_encoder encoder; > >>>>>> struct drm_bridge bridge; > >>>>>> struct drm_bridge *next_bridge; > >>>>>> + struct drm_connector *connector; > >>>>>> struct phy *phy; > >>>>>> > >>>>>> void __iomem *regs; > >>>>>> @@ -977,10 +979,19 @@ static int mtk_dsi_encoder_init(struct drm_d= evice *drm, struct mtk_dsi *dsi) > >>>>>> */ > >>>>>> dsi->encoder.possible_crtcs =3D 1; > >>>>>> > >>>>>> - ret =3D drm_bridge_attach(&dsi->encoder, &dsi->bridge, NUL= L, 0); > >>>>>> + ret =3D drm_bridge_attach(&dsi->encoder, &dsi->bridge, NUL= L, > >>>>>> + DRM_BRIDGE_ATTACH_NO_CONNECTOR); > >>>>>> if (ret) > >>>>>> goto err_cleanup_encoder; > >>>>>> > >>>>>> + dsi->connector =3D drm_bridge_connector_init(drm, &dsi->en= coder); > >>>>>> + if (IS_ERR(dsi->connector)) { > >>>>>> + DRM_ERROR("Unable to create bridge connector\n"); > >>>>>> + ret =3D PTR_ERR(dsi->connector); > >>>>>> + goto err_cleanup_encoder; > >>>>>> + } > >>>>>> + drm_connector_attach_encoder(dsi->connector, &dsi->encoder= ); > >>>>>> + > >>>>>> return 0; > >>>>>> > >>>>>> err_cleanup_encoder: > >>>>>> -- > >>>>>> 2.26.2 > >>>>>> > >>>>>> > >>>>>> _______________________________________________ > >>>>>> Linux-mediatek mailing list > >>>>>> Linux-mediatek@lists.infradead.org > >>>>>> http://lists.infradead.org/mailman/listinfo/linux-mediatek > > From mboxrd@z Thu Jan 1 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<53683f2d-23c7-57ab-2056-520c50795ffe@collabora.com> <37191700-5832-2931-5764-7f7fddd023b9@collabora.com> In-Reply-To: From: Chun-Kuang Hu Date: Sat, 16 May 2020 18:10:46 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v4 7/7] drm/mediatek: mtk_dsi: Create connector for bridges To: Enric Balletbo i Serra X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200516_031100_943812_D59042F2 X-CRM114-Status: GOOD ( 31.96 ) 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: Chun-Kuang Hu , Nicolas Boichat , Daniel Vetter , Enric Balletbo Serra , linux-kernel , dri-devel , David Airlie , "moderated list:ARM/Mediatek SoC support" , Laurent Pinchart , Philipp Zabel , Hsin-Yi Wang , Matthias Brugger , Collabora Kernel ML , Sam Ravnborg , Linux ARM Content-Type: text/plain; charset="utf-8" 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b=LhLCJDAL0fNfflOdG/9eckydIkq/pxQDSPOuvwX2xtZX0YydzN3q+55SdL8jLFUJf 9RFxrNQ7lpHFyhXzSJRzOeZTuQ5IwkfulkNxFAP9r70s3VqSETeNtGSQnf8qpsVq7r pBbyqUDkqjoBFDx0njrJ1jdquUCSkHkP7WPi+1Ec= Received: by mail-ej1-f49.google.com with SMTP id l21so4422503eji.4; Sat, 16 May 2020 03:11:00 -0700 (PDT) X-Gm-Message-State: AOAM533+tWzA6IZMq3N59SkgCsIrYCpn3J+R1HJhvqlIJWLjCCL/NDEx UWS7lNn9jpGNDw2gzzUEoy3450kqXJLjURbhXg== X-Google-Smtp-Source: ABdhPJwvZ8w+iX3fL8kbrpnlBQ7nXKFx8Y1EtQ19L0cdysqc+LfEj/7Pb+OD711IvGi1JSb1fwswDRnCiVSuKx6RNVU= X-Received: by 2002:a17:906:7717:: with SMTP id q23mr6957899ejm.38.1589623858510; Sat, 16 May 2020 03:10:58 -0700 (PDT) MIME-Version: 1.0 References: <20200501152335.1805790-1-enric.balletbo@collabora.com> <20200501152335.1805790-8-enric.balletbo@collabora.com> <53683f2d-23c7-57ab-2056-520c50795ffe@collabora.com> <37191700-5832-2931-5764-7f7fddd023b9@collabora.com> In-Reply-To: From: Chun-Kuang Hu Date: Sat, 16 May 2020 18:10:46 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v4 7/7] drm/mediatek: mtk_dsi: Create connector for bridges To: Enric Balletbo i Serra X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200516_031100_943812_D59042F2 X-CRM114-Status: GOOD ( 31.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chun-Kuang Hu , Nicolas Boichat , Daniel Vetter , Enric Balletbo Serra , linux-kernel , dri-devel , David Airlie , "moderated list:ARM/Mediatek SoC support" , Laurent Pinchart , Philipp Zabel , Hsin-Yi Wang , Matthias Brugger , Collabora Kernel ML , Sam Ravnborg , Linux ARM Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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AOAM5305EYAkJ0AiXec3B355CghMgXgby+eC3pGeH8oY93tVOqOyZM9R aN2MZ4AqC18AbHXmzjwN9dMF3sP7+YFtbl61jw== X-Google-Smtp-Source: ABdhPJwvZ8w+iX3fL8kbrpnlBQ7nXKFx8Y1EtQ19L0cdysqc+LfEj/7Pb+OD711IvGi1JSb1fwswDRnCiVSuKx6RNVU= X-Received: by 2002:a17:906:7717:: with SMTP id q23mr6957899ejm.38.1589623858510; Sat, 16 May 2020 03:10:58 -0700 (PDT) MIME-Version: 1.0 References: <20200501152335.1805790-1-enric.balletbo@collabora.com> <20200501152335.1805790-8-enric.balletbo@collabora.com> <53683f2d-23c7-57ab-2056-520c50795ffe@collabora.com> <37191700-5832-2931-5764-7f7fddd023b9@collabora.com> In-Reply-To: From: Chun-Kuang Hu Date: Sat, 16 May 2020 18:10:46 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v4 7/7] drm/mediatek: mtk_dsi: Create connector for bridges To: Enric Balletbo i Serra 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: Chun-Kuang Hu , Nicolas Boichat , linux-kernel , dri-devel , David Airlie , "moderated list:ARM/Mediatek SoC support" , Laurent Pinchart , Hsin-Yi Wang , Matthias Brugger , Collabora Kernel ML , Sam Ravnborg , Linux ARM Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" SGksIEVucmljOgoKRW5yaWMgQmFsbGV0Ym8gaSBTZXJyYSA8ZW5yaWMuYmFsbGV0Ym9AY29sbGFi b3JhLmNvbT4g5pa8IDIwMjDlubQ15pyIMTXml6Ug6YCx5LqUIOS4iuWNiDE6MzXlr6vpgZPvvJoK Pgo+IEhpIGFnYWluLAo+Cj4gT24gMTQvNS8yMCAxOToxMiwgRW5yaWMgQmFsbGV0Ym8gaSBTZXJy YSB3cm90ZToKPiA+IEhpIENodW4tS3VhbmcsCj4gPgo+ID4gT24gMTQvNS8yMCAxODo0NCwgQ2h1 bi1LdWFuZyBIdSB3cm90ZToKPiA+PiBIaSwgRW5yaWM6Cj4gPj4KPiA+PiBFbnJpYyBCYWxsZXRi byBpIFNlcnJhIDxlbnJpYy5iYWxsZXRib0Bjb2xsYWJvcmEuY29tPiDmlrwgMjAyMOW5tDXmnIgx NOaXpSDpgLHlm5sg5LiL5Y2IMTE6NDLlr6vpgZPvvJoKPiA+Pj4KPiA+Pj4gSGkgQ2h1bi1LdWFu 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