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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 86C77C4CEC4 for ; Wed, 18 Sep 2019 14:34:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 53EA2218AE for ; Wed, 18 Sep 2019 14:34:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=renesasgroup.onmicrosoft.com header.i=@renesasgroup.onmicrosoft.com header.b="WIpKRiWP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731299AbfIROeJ (ORCPT ); Wed, 18 Sep 2019 10:34:09 -0400 Received: from mail-eopbgr1320121.outbound.protection.outlook.com ([40.107.132.121]:60336 "EHLO APC01-PU1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727056AbfIROeI (ORCPT ); Wed, 18 Sep 2019 10:34:08 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=fgpWR20cFw7I8bAMYVlC82vr23+t8f5PG8Kw4Ud/P8j/4UEdefuOE4HUKOV2R/6PuMOuifdzfvQnhcRx25fo3qc1mD1oPDfR+6CHjUQoApMwWN2PCCB4gdw1DmHkeYYzi6yl9zjQA7TplywkSEs8x0yj8Wx+O6ppRrLTc2N1hYCHGTdNjcClAw6m3hrpkOAJro5QkjD629gm0hyiRPF6C31YvUEaKg2JbZu6Nxh1ZcwebfQ/5DLW6g97Ycu2AvvsZ1d5qYojAIPv3DEYpFiI3HHSxg5/jmQWhS+CwyUjji9JF+gP89izrNf6jl6L0VAebCnXTISroOCqk2RjfPcJiQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=6YUooBcRdihS5xFS/3EQ5gOkc0Ng1eOm7f7IlkZggvg=; b=FdIoEB/RKB14HLIRW+xRRmr6xsCyjLkOrdj0jjsowV3obYeiDCb2k7Z2zPDV/nE2H2KQXR7X2I3onxn4PLZ7xauS7+k2ABdBJjdcOpXQIeyT9++xtKE/VA1w2R/VUt5cPQxZILx0n2pvStpRF2mJWKCzqzuq2Ui0uUyMzZtcvvQ7LaUdqpa1SlQNtYId5hcDPOrLMDbcJjDTtwdupzdvwf5YPEgrQc6GEaE9dLhwGskzEjr8M1E9YYBayggfYU1hksiiziOAPEutk0QQ2JFRL3D3mIcbMZXYWDb5GJnqROo77OxAzmh52OMvWzechTk2WQ/ltVx7/PBl67b1b6d5CA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=renesas.com; dmarc=pass action=none header.from=renesas.com; dkim=pass header.d=renesas.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=renesasgroup.onmicrosoft.com; s=selector2-renesasgroup-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=6YUooBcRdihS5xFS/3EQ5gOkc0Ng1eOm7f7IlkZggvg=; b=WIpKRiWPmaGmFYoY0QaIroWqyRbyxnrsdMCGsHlZmj0M8XnN9JNhTwtZ4Y5IY3P99XzOZ1qVc0IhCDG+4Z9TAcpO0U78eDaj8F8Z1q6K1BlkGGQEDvcV9MsxGZKrSTQpET74utWrVAJvNv/VGXcCiz5Bf4ES+sMuCFzMIDewLbo= Received: from TY2PR01MB2924.jpnprd01.prod.outlook.com (20.177.98.81) by TY2PR01MB2810.jpnprd01.prod.outlook.com (20.177.100.76) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2263.24; Wed, 18 Sep 2019 14:34:04 +0000 Received: from TY2PR01MB2924.jpnprd01.prod.outlook.com ([fe80::7ce4:f502:8430:51a]) by TY2PR01MB2924.jpnprd01.prod.outlook.com ([fe80::7ce4:f502:8430:51a%7]) with mapi id 15.20.2263.023; Wed, 18 Sep 2019 14:34:04 +0000 From: Gareth Williams To: Laurent Pinchart CC: Yoshihiro Shimoda , "dri-devel@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , "linux-renesas-soc@vger.kernel.org" , Geert Uytterhoeven , Phil Edworthy , Fabrizio Castro , "kieran.bingham+renesas@ideasonboard.com" Subject: RE: DRM Driver implementation question Thread-Topic: DRM Driver implementation question Thread-Index: AdVslX1ZBzegHzojRVS64lgG04s8jgAenS2AABbmTEAALXtJgAAC+tRg Date: Wed, 18 Sep 2019 14:34:04 +0000 Message-ID: References: <20190918130331.GD6306@pendragon.ideasonboard.com> In-Reply-To: <20190918130331.GD6306@pendragon.ideasonboard.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=gareth.williams.jx@renesas.com; x-originating-ip: [193.141.220.21] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 192bd398-f14a-4b5e-93ed-08d73c4541a2 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(5600167)(711020)(4605104)(1401327)(4618075)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7193020);SRVR:TY2PR01MB2810; x-ms-traffictypediagnostic: TY2PR01MB2810:|TY2PR01MB2810: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 01644DCF4A x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(4636009)(39860400002)(366004)(136003)(346002)(396003)(376002)(199004)(51444003)(189003)(7696005)(86362001)(6246003)(6916009)(3846002)(76176011)(99286004)(316002)(25786009)(486006)(6506007)(2906002)(26005)(102836004)(66946007)(6116002)(54906003)(66556008)(66446008)(64756008)(5660300002)(6436002)(476003)(186003)(55016002)(9686003)(71200400001)(4326008)(52536014)(3480700005)(305945005)(74316002)(8936002)(33656002)(256004)(478600001)(71190400001)(81166006)(14454004)(76116006)(81156014)(66476007)(229853002)(7736002)(446003)(66066001)(11346002)(8676002);DIR:OUT;SFP:1102;SCL:1;SRVR:TY2PR01MB2810;H:TY2PR01MB2924.jpnprd01.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: renesas.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: V4OZMMhzxQgh86xI8uI2/yCEfd4Au5/shb44840SGwbs/3FO2lauSL18d2Npjvok69ekvKqs/7XKO7I6IZuFxh6FDftu6ACDj24kL7TLZ+4kniS1ZdBdSFkjFWzAr92HhcvhvgpUrdFpcidPcbJO6tLJc0kNI0WYWRj84UwYtyfYeEIOHVaG8me3qFuLe/snBp+BDN7JvV34p0Ai14Cl/l7gM4O0wgpDuH8uLXALZ6hA5jsHsi1UBHwVyhj0M9HGm5dJFZ/muEN+SfyAsBt3HHgs9oHu5NqEkg1cmMIXHKwyDUmKtyMPGBplBeIY5/LqCfkPjij0sJSIzAblJ6DzusThaSkodXIhvvo7ZC4ir98VP6Kp+VTbYihJ9JlgsZh7KxKKebsjcdr8e2Ys3FqyGODGN6zFrkjpfFv7bJhcK1A= Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: renesas.com X-MS-Exchange-CrossTenant-Network-Message-Id: 192bd398-f14a-4b5e-93ed-08d73c4541a2 X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Sep 2019 14:34:04.5589 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 53d82571-da19-47e4-9cb4-625a166a4a2a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: HT+0cdxqkahTPYmJcH3H6lCPMONBRI02HruhZe/C77F2Y7GNGGa/JXHnQGURXsqiaq81L1HwFpmJLOreL6w043Tgx9FRTWU33vvvHgVy93I= X-MS-Exchange-Transport-CrossTenantHeadersStamped: TY2PR01MB2810 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org SGkgTGF1cmVudCwNCg0KT24gV2VkLCBTZXAgMTgsIDIwMTkgYXQgMDQ6MDQ6MzRQTSArMDAwMCwg TGF1cmVudCBQaW5jaGFydCB3cm90ZToNCj4gDQo+IEhpIEdhcmV0aCwNCj4gDQo+IFNvcnJ5IGZv ciB0aGUgZGVsYXllZCByZXNwb25zZSwgSSB3YXMgdHJhdmVsbGluZyBmb3IgdGhlIExpbnV4IA0K PiBQbHVtYmVycyBDb25mZXJlbmNlIGZvbGxvd2VkIGJ5IGEgY29kZSBjYW1wLg0KPiANCj4gT24g VHVlLCBTZXAgMTcsIDIwMTkgYXQgMDM6Mjc6MzRQTSArMDAwMCwgR2FyZXRoIFdpbGxpYW1zIHdy b3RlOg0KPiA+IEhpIFlvc2hpaGlybywNCj4gPg0KPiA+IFRoaXMgbG9va3MgbGlrZSBhbiBlbGVn YW50IHNvbHV0aW9uIHRoYXQgSSBjYW4gaW1wbGVtZW50Lg0KPiA+IE1hbnkgdGhhbmtzIGZvciBw b2ludGluZyBtZSBpbiBhIGdvb2QgZGlyZWN0aW9uLg0KPiA+DQo+ID4gPiBGcm9tOiBZb3NoaWhp cm8gU2hpbW9kYSwgU2VudDogVHVlc2RheSwgU2VwdGVtYmVyIDE3LCAyMDE5IDA1OjM5IA0KPiA+ ID4gUE0NCj4gPiA+DQo+ID4gPiBIaSBHYXJldGgsDQo+ID4gPg0KPiA+ID4gPiBGcm9tOiBHYXJl dGggV2lsbGlhbXMsIFNlbnQ6IE1vbmRheSwgU2VwdGVtYmVyIDE2LCAyMDE5IDEwOjU2IFBNDQo+ ID4gPiA+DQo+ID4gPiA+IEhpIExhdXJlbnQvS2llcmFuLA0KPiA+ID4gPg0KPiA+ID4gPiBJIG5l ZWQgdG8gdXBzdHJlYW0gYSBkcml2ZXIgZm9yIGEgZGlzcGxheSBjb250cm9sbGVyIHRoYXQgd2l0 aGluIA0KPiA+ID4gPiBpdHMgcmVnaXN0ZXJzIG1lbW9yeSByZWdpb24gY29udGFpbnMgcmVnaXN0 ZXJzIHJlbGF0ZWQgdG8gYSBQV00gDQo+ID4gPiA+IGRldmljZS4gVGhlIFBXTSBkZXZpY2UgaXMg Zm9yIGNvbnRyb2xsaW5nIHRoZSBiYWNrbGlnaHQgb2YgdGhlIA0KPiA+ID4gPiBkaXNwbGF5Lg0K PiA+ID4gPg0KPiA+ID4gPiBJZGVhbGx5LCBJIHdvdWxkIGxpa2UgdG8gY3JlYXRlIGEgc2VwYXJh dGVkIGRyaXZlciBmb3IgdGhlIFBXTSwgDQo+ID4gPiA+IHNvIHRoYXQgSSBjYW4gcmUtdXNlICJw d20tYmFja2xpZ2h0IiwgYnV0IHNpbmNlIHRoZSByZWdpc3RlcnMgDQo+ID4gPiA+IGZvciB0aGUg UFdNIGFyZSByaWdodCBpbiB0aGUgbWlkZGxlIG9mIHRoZSByZWdpc3RlcnMgZm9yIHRoZSANCj4g PiA+ID4gZGlzcGxheSBjb250cm9sbGVyIEkgd291bGQgbmVlZCB0byBpb3JlbWFwIHRoZSBtZW1v cnkgcmVnaW9uIGZvciANCj4gPiA+ID4gdGhlIFBXTSByZWdpc3RlcnMgcmVnaW9uIHR3aWNlLCBv bmNlIGZyb20gdGhlIGRpc3BsYXkgY29udHJvbGxlciANCj4gPiA+ID4gZHJpdmVyLCBhbmQgb25j ZSBmcm9tIHRoZSBQV00gZHJpdmVyLg0KPiA+ID4gPg0KPiA+ID4gPiBEbyB5b3UgdGhpbmsgdGhh dCB0aGUgZG91YmxlIGlvcmVtYXAgd291bGQgYmUgYWNjZXB0YWJsZSB1cHN0cmVhbT8NCj4gPiA+ DQo+ID4gPiBJIHRoaW5rIHRoYXQgYW4gTUZEIGRyaXZlciBjYW4gc3VwcG9ydCBzdWNoIGhhcmR3 YXJlLiBJIGNoZWNrZWQgDQo+ID4gPiBEb2N1bWVudGF0aW9uL2RldmljZXRyZWUvYmluZGluZ3Mv bWZkIHJvdWdobHksIGFuZCB0aGVuIA0KPiA+ID4gYXRtZWwtaGxjZGMudHh0IHNlZW1zIHRvIGhh dmUgYSBkaXNwbGF5IGNvbnRyb2xsZXIgYW5kIGEgUFdNIGRldmljZS4NCj4gDQo+IFdoaWxlIE1G RCBzaG91bGQgdGVjaG5pY2FsbHkgd29yaywgSSB0aGluayBpdCdzIHF1aXRlIG92ZXJraWxsLiBZ b3UgDQo+IGNvdWxkIGluc3RlYWQgYnVuZGxlIGJvdGggdGhlIGRpc3BsYXkgY29udHJvbGxlciBh bmQgdGhlIFBXTSANCj4gY29udHJvbGxlciBpbiB0aGUgc2FtZSBkcml2ZXIuIFRoZSBkcml2ZXIg d291bGQgY3JlYXRlIGJvdGggYSBEUk0vS01TIA0KPiBkZXZpY2UgYW5kIGEgUFdNIGRldmljZS4g VGhlIERUIG5vZGUgZm9yIHlvdXIgZGV2aWNlIHdvdWxkIGNvbnRhaW4gYSANCj4gI3B3bS1jZWxs cyBwcm9wZXJ0eSBhbmQgY291bGQgdGh1cyBiZSByZWZlcmVuY2VkIGFzIGEgUFdNIGNvbnRyb2xs ZXIgDQo+IGJ5IHRoZSBiYWNrbGlnaHQgdXNpbmcgdGhlIHB3bXMgcHJvcGVydHkuDQpUaGlzIG1h a2VzIHNlbnNlLCBtYW55IHRoYW5rcyBmb3IgcG9pbnRpbmcgbWUgaW4gdGhlIGRpcmVjdGlvbi4N Cg0KPiANCj4gLS0NCj4gUmVnYXJkcywNCj4gDQo+IExhdXJlbnQgUGluY2hhcnQNCg0KS2luZCBS ZWdhcmRzLA0KDQpHYXJldGggV2lsbGlhbXMNCg==