[{"id":1761540,"web_url":"http://patchwork.ozlabs.org/comment/1761540/","msgid":"","list_archive_url":null,"date":"2017-09-01T09:21:28","subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","submitter":{"id":26857,"url":"http://patchwork.ozlabs.org/api/people/26857/","name":"Ard Biesheuvel","email":"ard.biesheuvel@linaro.org"},"content":"On 1 September 2017 at 08:27, Daniel Axtens wrote:\n> This patch set:\n>\n> - splits the default display handling out from VGA arbiter, into its\n> own file and behind its own Kconfig option (and gives the functions\n> better names).\n>\n> - adds extra detection of default devices. To be nominated, the vga\n> arbiter and platform hooks must not have nominated a default. A\n> card will then only be nominated if it has a driver attached and\n> has IO or memory decoding enabled.\n>\n> - adds relevant documentation.\n>\n> The practical impact of this is improved X autoconfiguration on some\n> arm64 systems.\n>\n> Changes in v3:\n>\n> - Add documentation - thanks Daniel Vetter for pointing it out.\n>\n> - Clarify explanations. Thanks to everyone for continuing to bear\n> with my incomplete understanding of PCI and provide some clarity.\n>\n> - Split refactoring and adding functionality.\n>\n> Changes in v2: https://www.spinics.net/lists/linux-pci/msg64007.html\n>\n> Drop all the powerpc patches. [explanation snipped]\n>\n> v1: https://www.spinics.net/lists/linux-pci/msg63581.html\n>\n\nIf we are all in agreement that fixing X is not an option, I think\nthis is a reasonable approach\n\nAcked-by: Ard Biesheuvel ","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"S3mZ8udk\"; \n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=linaro.org header.i=@linaro.org\n\theader.b=\"LX2pt3Hp\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xkDK20NkZz9s7C\n\tfor ;\n\tFri, 1 Sep 2017 19:21:58 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dni9C-0003VP-4F; 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\n\tFri, 01 Sep 2017 02:21:29 -0700 (PDT)","MIME-Version":"1.0","In-Reply-To":"<20170901072744.2409-1-dja@axtens.net>","References":"<20170901072744.2409-1-dja@axtens.net>","From":"Ard Biesheuvel ","Date":"Fri, 1 Sep 2017 10:21:28 +0100","Message-ID":"","Subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","To":"Daniel Axtens ","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20170901_022150_723808_450BA8F4 ","X-CRM114-Status":"GOOD ( 12.92 )","X-Spam-Score":"-2.7 (--)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-2.7 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/,\n\tlow\n\ttrust [2607:f8b0:4001:c06:0:0:0:22b listed in] [list.dnswl.org]\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]\n\t-0.1 DKIM_VALID Message has at least one valid DKIM or DK signature\n\t0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n\tnot necessarily valid\n\t-0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n\tauthor's domain","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"Lorenzo Pieralisi ,\n\tCatalin Marinas ,\n\tGabriele Paoloni ,\n\tDavid Airlie , linux-pci ,\n\tWill Deacon ,\n\tdri-devel , \n\t\"Liuxinliang \\(Matthew Liu\\)\" ,\n\tAlex Williamson ,\n\tLukas Wunner , Bjorn Helgaas ,\n\tBenjamin Herrenschmidt ,\n\tZou Rongrong , \"Vetter,\n\tDaniel\" ,\n\tlinuxppc-dev ,\n\t\"linux-arm-kernel@lists.infradead.org\"\n\t","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1761603,"web_url":"http://patchwork.ozlabs.org/comment/1761603/","msgid":"<877exi4pqs.fsf@linkitivity.dja.id.au>","list_archive_url":null,"date":"2017-09-01T11:34:03","subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","submitter":{"id":65792,"url":"http://patchwork.ozlabs.org/api/people/65792/","name":"Daniel Axtens","email":"dja@axtens.net"},"content":"Hi Ard,\n\n> If we are all in agreement that fixing X is not an option, I think\n> this is a reasonable approach\n\nThis did come up in discussion at some earlier point in one of the many\nspins we've done of this - I don't remember if you brought it up or\nsomeone else did - but my concern was this: If it were just X we would\nbe fine, but if we go down that path I'm worried about also having to\nfix Mir/Wayland/whatever-the-new-exciting-display-server-is-this-week,\nad nauseum.\n\n> Acked-by: Ard Biesheuvel \n\nThanks!\n\nRegards,\nDaniel","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; 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\n\tFri, 01 Sep 2017 04:34:07 -0700 (PDT)","From":"Daniel Axtens ","To":"Ard Biesheuvel ","Subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","In-Reply-To":"","References":"<20170901072744.2409-1-dja@axtens.net>\n\t","Date":"Fri, 01 Sep 2017 21:34:03 +1000","Message-ID":"<877exi4pqs.fsf@linkitivity.dja.id.au>","MIME-Version":"1.0","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20170901_043429_134498_357A79E0 ","X-CRM114-Status":"UNSURE ( 8.10 )","X-CRM114-Notice":"Please train this message.","X-Spam-Score":"-2.0 (--)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-2.0 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/,\n\tno\n\ttrust [2607:f8b0:400e:c00:0:0:0:22e listed in] [list.dnswl.org]\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]\n\t-0.1 DKIM_VALID Message has at least one valid DKIM or DK signature\n\t0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n\tnot necessarily valid\n\t-0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n\tauthor's domain","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"Lorenzo Pieralisi ,\n\tCatalin Marinas ,\n\tGabriele Paoloni ,\n\tDavid Airlie , linux-pci ,\n\tWill Deacon ,\n\tdri-devel , \n\t\"Liuxinliang \\(Matthew Liu\\)\" ,\n\tAlex Williamson ,\n\tLukas Wunner , Bjorn Helgaas ,\n\tBenjamin Herrenschmidt ,\n\tZou Rongrong , \"Vetter,\n\tDaniel\" ,\n\tlinuxppc-dev ,\n\t\"linux-arm-kernel@lists.infradead.org\"\n\t","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1766041,"web_url":"http://patchwork.ozlabs.org/comment/1766041/","msgid":"","list_archive_url":null,"date":"2017-09-11T04:35:51","subject":"Re: [PATCH v3 2/3] drm: add fallback default device detection","submitter":{"id":66955,"url":"http://patchwork.ozlabs.org/api/people/66955/","name":"Andrew Donnellan","email":"andrew.donnellan@au1.ibm.com"},"content":"On 01/09/17 17:27, Daniel Axtens wrote:\n> The VGA arbiter selects a default VGA device that is enabled and\n> reachable via the legacy VGA resources (mem 0xa0000-0xbffff, io\n> 0x3b0-0x3bb, io 0x3c0-0x3df, etc).\n> \n> (As a special case for x86 and IA64, this can be overridden by\n> EFI.)\n> \n> If there is no such device, e.g., because there's no enabled VGA\n> device, the host bridge doesn't support access to those legacy\n> resources, or a PCI-PCI bridge doesn't have VGA Enable set, a\n> platform may select an arbitrary device by calling\n> pci_set_default_display(). powerpc does this, for example.\n> \n> If there is also no platform hook, there will be no default\n> device nominated. This is not necessarily what we want.\n> \n> Add handling for devices that aren't handled by the vga arbiter or\n> platform by adding a late initcall and a class enable hook. If there\n> is no default from vgaarb or the platform then the first VGA card\n> that is enabled, has a driver bound, and can decode memory or I/O\n> will be marked as default.\n> \n> This means single-card setups on systems without access to legacy\n> areas and without arch hooks will work. Multi-card setups on these\n> systems will nominate an arbitrary device, rather than no devices.\n> \n> Signed-off-by: Daniel Axtens \n> \n> ---\n> \n> v3:\n> \n> Split out from re-organisation for simplicity.\n> Add better description and better documentaion.\n> \n> Thanks to (in no particular order), Daniel Vetter, Lorenzo Pieralisi,\n> Ard Biesheuvel and Dave Airlie. Special thanks to Ben Herrenschmidt\n> and Bjorn Helgass, whose prose I have borrowed.\n> \n> v1:\n> \n> Tested on:\n> - x86_64 laptop\n> - arm64 D05 board with hibmc card\n> - qemu powerpc with tcg and bochs std-vga\n> \n> I know this adds another config option and that's a bit sad, but\n> we can't include it unconditionally as it depends on PCI.\n> Suggestions welcome.\n\nTested on our iMac G5, the fallback handler doesn't fire (which should \nbe correct).\n\nTested-by: Andrew Donnellan \n\n> +static void vga_default_enable_hook(struct pci_dev *pdev)\n> +{\n> + if (!vga_default_active)\n> +\t return;\n> +\n> + if (pci_default_display())\n> + return;\n> +\n> + vga_default_try_device(pdev);\n> +}\n> +DECLARE_PCI_FIXUP_CLASS_ENABLE(PCI_ANY_ID, PCI_ANY_ID,\n> +\t\t\t PCI_CLASS_DISPLAY_VGA, 8,\n> +\t\t\t vga_default_enable_hook)\n> \n\nLooks like you have some spaces/tabs inconsistencies here.","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org\n\theader.b=\"ptPC6Gb8\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xrFWH2zxCz9sBd\n\tfor ;\n\tMon, 11 Sep 2017 14:36:42 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1drGSc-0007i9-K2; Mon, 11 Sep 2017 04:36:38 +0000","from mx0a-001b2d01.pphosted.com ([148.163.156.1])\n\tby bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux))\n\tid 1drGST-0007Wk-LP for linux-arm-kernel@lists.infradead.org;\n\tMon, 11 Sep 2017 04:36:36 +0000","from pps.filterd (m0098410.ppops.net [127.0.0.1])\n\tby mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id\n\tv8B4YQPk144599 for ;\n\tMon, 11 Sep 2017 00:35:59 -0400","from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145])\n\tby mx0a-001b2d01.pphosted.com with ESMTP id 2cwdg4mh22-1\n\t(version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT)\n\tfor ;\n\tMon, 11 Sep 2017 00:35:58 -0400","from localhost\n\tby e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use\n\tOnly! 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Linux x86_64; rv:52.0) Gecko/20100101\n\tThunderbird/52.2.1","MIME-Version":"1.0","In-Reply-To":"<20170901072744.2409-3-dja@axtens.net>","Content-Language":"en-AU","X-TM-AS-MML":"disable","x-cbid":"17091104-0008-0000-0000-00000157392F","X-IBM-AV-DETECTION":"SAVI=unused REMOTE=unused XFE=unused","x-cbparentid":"17091104-0009-0000-0000-0000098B5D4A","Message-Id":"","X-Proofpoint-Virus-Version":"vendor=fsecure engine=2.50.10432:, ,\n\tdefinitions=2017-09-11_01:, , signatures=0","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n\tspamscore=0 suspectscore=0\n\tmalwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam\n\tadjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000\n\tdefinitions=main-1709110070","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20170910_213633_533278_849FE163 ","X-CRM114-Status":"GOOD ( 23.52 )","X-Spam-Score":"-2.6 (--)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-2.6 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3)\n\t[148.163.156.1 listed in wl.mailspike.net]\n\t-0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/,\n\tlow trust [148.163.156.1 listed in list.dnswl.org]\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]\n\t-0.0 RCVD_IN_MSPIKE_WL Mailspike good senders","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"lorenzo.pieralisi@arm.com, gabriele.paoloni@huawei.com,\n\tard.biesheuvel@linaro.org, airlied@linux.ie, catalin.marinas@arm.com, \n\twill.deacon@arm.com, dri-devel@lists.freedesktop.org,\n\tz.liuxinliang@hisilicon.com, alex.williamson@redhat.com,\n\tlukas@wunner.de, \n\thelgaas@kernel.org, zourongrong@gmail.com, daniel.vetter@intel.com","Content-Transfer-Encoding":"7bit","Content-Type":"text/plain; charset=\"us-ascii\"; Format=\"flowed\"","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1769875,"web_url":"http://patchwork.ozlabs.org/comment/1769875/","msgid":"<87d16oeeti.fsf@linkitivity.dja.id.au>","list_archive_url":null,"date":"2017-09-18T05:49:45","subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","submitter":{"id":65792,"url":"http://patchwork.ozlabs.org/api/people/65792/","name":"Daniel Axtens","email":"dja@axtens.net"},"content":"Hi all,\n\nThe merge window is well over by now - is there anything else I can do\nto get this series to a mergeable state? I'm not particularly across the\nrules for drm-misc, so please let me know if there are things I need to\nbe doing.\n\nRegards,\nDaniel\n\nDaniel Axtens writes:\n\n> This patch set:\n>\n> - splits the default display handling out from VGA arbiter, into its\n> own file and behind its own Kconfig option (and gives the functions\n> better names).\n>\n> - adds extra detection of default devices. To be nominated, the vga\n> arbiter and platform hooks must not have nominated a default. A\n> card will then only be nominated if it has a driver attached and\n> has IO or memory decoding enabled.\n>\n> - adds relevant documentation.\n>\n> The practical impact of this is improved X autoconfiguration on some\n> arm64 systems.\n>\n> Changes in v3:\n>\n> - Add documentation - thanks Daniel Vetter for pointing it out.\n>\n> - Clarify explanations. Thanks to everyone for continuing to bear\n> with my incomplete understanding of PCI and provide some clarity.\n>\n> - Split refactoring and adding functionality.\n>\n> Changes in v2: https://www.spinics.net/lists/linux-pci/msg64007.html\n>\n> Drop all the powerpc patches. [explanation snipped]\n>\n> v1: https://www.spinics.net/lists/linux-pci/msg63581.html\n>\n> Regards,\n> Daniel\n>\n> Daniel Axtens (3):\n> drm: split default display handler out of VGA arbiter\n> drm: add fallback default device detection\n> drm: documentation for default display device\n>\n> Documentation/gpu/default_display.rst | 93 +++++++++++++++++++\n> Documentation/gpu/index.rst | 1 +\n> arch/ia64/pci/fixup.c | 6 +-\n> arch/powerpc/kernel/pci-common.c | 6 +-\n> arch/x86/pci/fixup.c | 6 +-\n> arch/x86/video/fbdev.c | 4 +-\n> drivers/gpu/vga/Kconfig | 12 +++\n> drivers/gpu/vga/Makefile | 1 +\n> drivers/gpu/vga/default_display.c | 163 ++++++++++++++++++++++++++++++++++\n> drivers/gpu/vga/vga_switcheroo.c | 8 +-\n> drivers/gpu/vga/vgaarb.c | 61 +++----------\n> drivers/pci/pci-sysfs.c | 4 +-\n> include/linux/default_display.h | 44 +++++++++\n> include/linux/vgaarb.h | 15 ----\n> 14 files changed, 344 insertions(+), 80 deletions(-)\n> create mode 100644 Documentation/gpu/default_display.rst\n> create mode 100644 drivers/gpu/vga/default_display.c\n> create mode 100644 include/linux/default_display.h\n>\n> -- \n> 2.11.0","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"tCoLJAjy\"; \n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=axtens.net header.i=@axtens.net\n\theader.b=\"nn9R1Un/\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xwZq71MP1z9s7g\n\tfor ;\n\tMon, 18 Sep 2017 15:50:27 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dtowp-0005Ik-DB; Mon, 18 Sep 2017 05:50:23 +0000","from mail-pg0-x244.google.com ([2607:f8b0:400e:c05::244])\n\tby bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dtowd-0003zL-M1 for linux-arm-kernel@lists.infradead.org;\n\tMon, 18 Sep 2017 05:50:18 +0000","by mail-pg0-x244.google.com with SMTP id i130so4757170pgc.0\n\tfor ;\n\tSun, 17 Sep 2017 22:49:50 -0700 (PDT)","from localhost (114-198-116-25.dyn.iinet.net.au. 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\n\tSun, 17 Sep 2017 22:49:49 -0700 (PDT)","From":"Daniel Axtens ","To":"linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,\n\tlinux-arm-kernel@lists.infradead.org","Subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","In-Reply-To":"<20170901072744.2409-1-dja@axtens.net>","References":"<20170901072744.2409-1-dja@axtens.net>","Date":"Mon, 18 Sep 2017 15:49:45 +1000","Message-ID":"<87d16oeeti.fsf@linkitivity.dja.id.au>","MIME-Version":"1.0","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20170917_225011_840637_FAE525C0 ","X-CRM114-Status":"GOOD ( 16.69 )","X-Spam-Score":"-2.0 (--)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-2.0 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/,\n\tno\n\ttrust [2607:f8b0:400e:c05:0:0:0:244 listed in] [list.dnswl.org]\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]\n\t-0.1 DKIM_VALID Message has at least one valid DKIM or DK signature\n\t0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n\tnot necessarily valid\n\t-0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n\tauthor's domain","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"lorenzo.pieralisi@arm.com, gabriele.paoloni@huawei.com,\n\tard.biesheuvel@linaro.org, airlied@linux.ie, benh@kernel.crashing.org,\n\twill.deacon@arm.com, dri-devel@lists.freedesktop.org,\n\tz.liuxinliang@hisilicon.com, alex.williamson@redhat.com,\n\tlukas@wunner.de, \n\thelgaas@kernel.org, catalin.marinas@arm.com, zourongrong@gmail.com,\n\tdaniel.vetter@intel.com","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1775037,"web_url":"http://patchwork.ozlabs.org/comment/1775037/","msgid":"<87zi9ixsfn.fsf@linkitivity.dja.id.au>","list_archive_url":null,"date":"2017-09-25T23:35:40","subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","submitter":{"id":65792,"url":"http://patchwork.ozlabs.org/api/people/65792/","name":"Daniel Axtens","email":"dja@axtens.net"},"content":"Hi Bjorn,\n\n> But I think trying to split the \"default device\" part out from the VGA\n> arbiter ends up being overkill and making things more complicated\n> instead of simpler.\nFair enough.\n\n> Would something like the following work for you as well as the powerpc\n> case? On powerpc, we already use vga_set_default_device() to select a\n> device that doesn't use legacy VGA resources, so maybe we can just do\n> the same on ARM64?\n\nIt looks good. I'll try to get some time on the test system to test it\nand I'll pester my friends at IBM to give it a go as well.\n\n> I suppose there might be wrinkles in how the arbiter deals with\n> multiple graphics devices on those systems, since I don't think it\n> identifies these devices that don't use the legacy resources, but it\n> seems like we live with whatever those on are powerpc and probably can\n> on ARM64 as well.\n\nI would say so, yes.\n\nThanks for sticking with this!\n\nRegards,\nDaniel\n\n>\n>\n> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c\n> index 02831a396419..0ac7aa346c69 100644\n> --- a/arch/powerpc/kernel/pci-common.c\n> +++ b/arch/powerpc/kernel/pci-common.c\n> @@ -1740,15 +1740,3 @@ static void fixup_hide_host_resource_fsl(struct pci_dev *dev)\n> }\n> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);\n> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);\n> -\n> -static void fixup_vga(struct pci_dev *pdev)\n> -{\n> -\tu16 cmd;\n> -\n> -\tpci_read_config_word(pdev, PCI_COMMAND, &cmd);\n> -\tif ((cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) || !vga_default_device())\n> -\t\tvga_set_default_device(pdev);\n> -\n> -}\n> -DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,\n> -\t\t\t PCI_CLASS_DISPLAY_VGA, 8, fixup_vga);\n> diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c\n> index 76875f6299b8..9df4802c5f04 100644\n> --- a/drivers/gpu/vga/vgaarb.c\n> +++ b/drivers/gpu/vga/vgaarb.c\n> @@ -1468,6 +1468,21 @@ static int __init vga_arb_device_init(void)\n> \t\t\tvgaarb_info(dev, \"no bridge control possible\\n\");\n> \t}\n> \n> +\tif (!vga_default_device()) {\n> +\t\tlist_for_each_entry(vgadev, &vga_list, list) {\n> +\t\t\tstruct device *dev = &vgadev->pdev->dev;\n> +\t\t\tu16 cmd;\n> +\n> +\t\t\tpdev = vgadev->pdev;\n> +\t\t\tpci_read_config_word(pdev, PCI_COMMAND, &cmd);\n> +\t\t\tif (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {\n> +\t\t\t\tvgaarb_info(dev, \"setting as boot device\\n\");\n> +\t\t\t\tvga_set_default_device(pdev);\n> +\t\t\t\tbreak;\n> +\t\t\t}\n> +\t\t}\n> +\t}\n> +\n> \tpr_info(\"loaded\\n\");\n> \treturn rc;\n> }","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"oP/48qMR\"; \n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=axtens.net header.i=@axtens.net\n\theader.b=\"egmHQ8Gs\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y1L853QbFz9t2Q\n\tfor ;\n\tTue, 26 Sep 2017 09:36:37 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dwcvR-00076F-Mw; Mon, 25 Sep 2017 23:36:33 +0000","from mail-pf0-x242.google.com ([2607:f8b0:400e:c00::242])\n\tby bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dwcuz-0006IB-NE for linux-arm-kernel@lists.infradead.org;\n\tMon, 25 Sep 2017 23:36:14 +0000","by mail-pf0-x242.google.com with SMTP id i23so4237025pfi.2\n\tfor ;\n\tMon, 25 Sep 2017 16:35:44 -0700 (PDT)","from localhost (114-198-116-25.dyn.iinet.net.au. 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\n\tMon, 25 Sep 2017 16:35:44 -0700 (PDT)","From":"Daniel Axtens ","To":"Bjorn Helgaas ","Subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","In-Reply-To":"<20170925163948.GD15970@bhelgaas-glaptop.roam.corp.google.com>","References":"<20170901072744.2409-1-dja@axtens.net>\n\t<20170925163948.GD15970@bhelgaas-glaptop.roam.corp.google.com>","Date":"Tue, 26 Sep 2017 09:35:40 +1000","Message-ID":"<87zi9ixsfn.fsf@linkitivity.dja.id.au>","MIME-Version":"1.0","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20170925_163606_713342_B8779A55 ","X-CRM114-Status":"GOOD ( 15.00 )","X-Spam-Score":"-2.0 (--)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-2.0 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/,\n\tno\n\ttrust [2607:f8b0:400e:c00:0:0:0:242 listed in] [list.dnswl.org]\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]\n\t-0.1 DKIM_VALID Message has at least one valid DKIM or DK signature\n\t0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n\tnot necessarily valid\n\t-0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n\tauthor's domain","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"lorenzo.pieralisi@arm.com, catalin.marinas@arm.com,\n\tgabriele.paoloni@huawei.com, ard.biesheuvel@linaro.org,\n\tairlied@linux.ie, linux-pci@vger.kernel.org, will.deacon@arm.com,\n\tdri-devel@lists.freedesktop.org, z.liuxinliang@hisilicon.com,\n\talex.williamson@redhat.com, lukas@wunner.de, benh@kernel.crashing.org,\n\tzourongrong@gmail.com, daniel.vetter@intel.com,\n\tlinuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1775150,"web_url":"http://patchwork.ozlabs.org/comment/1775150/","msgid":"","list_archive_url":null,"date":"2017-09-26T04:50:47","subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","submitter":{"id":1959,"url":"http://patchwork.ozlabs.org/api/people/1959/","name":"Daniel Vetter","email":"daniel@ffwll.ch"},"content":"On Mon, Sep 18, 2017 at 7:49 AM, Daniel Axtens wrote:\n> Hi all,\n>\n> The merge window is well over by now - is there anything else I can do\n> to get this series to a mergeable state? I'm not particularly across the\n> rules for drm-misc, so please let me know if there are things I need to\n> be doing.\n\ndrm-misc is always open for feature merging, but the patch series\nlacks full r-b by someone with clue on this stuff (i.e. probably not\nme). Pls find someone who can do the in-depth review. Just an Ack\nfeels a bit thin.\n-Daniel\n\n>\n> Regards,\n> Daniel\n>\n> Daniel Axtens writes:\n>\n>> This patch set:\n>>\n>> - splits the default display handling out from VGA arbiter, into its\n>> own file and behind its own Kconfig option (and gives the functions\n>> better names).\n>>\n>> - adds extra detection of default devices. To be nominated, the vga\n>> arbiter and platform hooks must not have nominated a default. A\n>> card will then only be nominated if it has a driver attached and\n>> has IO or memory decoding enabled.\n>>\n>> - adds relevant documentation.\n>>\n>> The practical impact of this is improved X autoconfiguration on some\n>> arm64 systems.\n>>\n>> Changes in v3:\n>>\n>> - Add documentation - thanks Daniel Vetter for pointing it out.\n>>\n>> - Clarify explanations. Thanks to everyone for continuing to bear\n>> with my incomplete understanding of PCI and provide some clarity.\n>>\n>> - Split refactoring and adding functionality.\n>>\n>> Changes in v2: https://www.spinics.net/lists/linux-pci/msg64007.html\n>>\n>> Drop all the powerpc patches. [explanation snipped]\n>>\n>> v1: https://www.spinics.net/lists/linux-pci/msg63581.html\n>>\n>> Regards,\n>> Daniel\n>>\n>> Daniel Axtens (3):\n>> drm: split default display handler out of VGA arbiter\n>> drm: add fallback default device detection\n>> drm: documentation for default display device\n>>\n>> Documentation/gpu/default_display.rst | 93 +++++++++++++++++++\n>> Documentation/gpu/index.rst | 1 +\n>> arch/ia64/pci/fixup.c | 6 +-\n>> arch/powerpc/kernel/pci-common.c | 6 +-\n>> arch/x86/pci/fixup.c | 6 +-\n>> arch/x86/video/fbdev.c | 4 +-\n>> drivers/gpu/vga/Kconfig | 12 +++\n>> drivers/gpu/vga/Makefile | 1 +\n>> drivers/gpu/vga/default_display.c | 163 ++++++++++++++++++++++++++++++++++\n>> drivers/gpu/vga/vga_switcheroo.c | 8 +-\n>> drivers/gpu/vga/vgaarb.c | 61 +++----------\n>> drivers/pci/pci-sysfs.c | 4 +-\n>> include/linux/default_display.h | 44 +++++++++\n>> include/linux/vgaarb.h | 15 ----\n>> 14 files changed, 344 insertions(+), 80 deletions(-)\n>> create mode 100644 Documentation/gpu/default_display.rst\n>> create mode 100644 drivers/gpu/vga/default_display.c\n>> create mode 100644 include/linux/default_display.h\n>>\n>> --\n>> 2.11.0\n> _______________________________________________\n> dri-devel mailing list\n> dri-devel@lists.freedesktop.org\n> https://lists.freedesktop.org/mailman/listinfo/dri-devel","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1776018,"web_url":"http://patchwork.ozlabs.org/comment/1776018/","msgid":"<87k20kyezs.fsf@linkitivity.dja.id.au>","list_archive_url":null,"date":"2017-09-27T03:52:55","subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","submitter":{"id":65792,"url":"http://patchwork.ozlabs.org/api/people/65792/","name":"Daniel Axtens","email":"dja@axtens.net"},"content":"Hi Bjorn,\n\nYes, this works:\n\nTested-by: Daniel Axtens # arm64, ppc64-qemu-tcg\n\n\nRegards,\nDaniel\n> On Fri, Sep 01, 2017 at 05:27:41PM +1000, Daniel Axtens wrote:\n>> This patch set:\n>> \n>> - splits the default display handling out from VGA arbiter, into its\n>> own file and behind its own Kconfig option (and gives the functions\n>> better names).\n>> \n>> - adds extra detection of default devices. To be nominated, the vga\n>> arbiter and platform hooks must not have nominated a default. A\n>> card will then only be nominated if it has a driver attached and\n>> has IO or memory decoding enabled.\n>> \n>> - adds relevant documentation.\n>> \n>> The practical impact of this is improved X autoconfiguration on some\n>> arm64 systems.\n>\n> I think I gave you bad advice about trying to separate the \"default\n> device\" idea from the VGA arbiter.\n>\n> It is true that the \"VGA arbiter\" per se is related to routing the\n> legacy VGA resources, and the arbiter currently only selects a default\n> device if it finds a device to which those resources are routed.\n>\n> We have some cases where we want to select a default device that may\n> not support the legacy VGA resources, or where they might not be\n> routed to the device:\n>\n> - systems where we match the EFI framebuffer address with a BAR, and\n> select that device as default,\n>\n> - powerpc systems where there may be no host bridge window that maps\n> to the legacy VGA resources,\n>\n> - your ARM64 systems where the default device may be behind a bridge\n> that doesn't support legacy VGA routing (PCI_BRIDGE_CTL_VGA)\n>\n> But I think trying to split the \"default device\" part out from the VGA\n> arbiter ends up being overkill and making things more complicated\n> instead of simpler.\n>\n> Would something like the following work for you as well as the powerpc\n> case? On powerpc, we already use vga_set_default_device() to select a\n> device that doesn't use legacy VGA resources, so maybe we can just do\n> the same on ARM64?\n>\n> I suppose there might be wrinkles in how the arbiter deals with\n> multiple graphics devices on those systems, since I don't think it\n> identifies these devices that don't use the legacy resources, but it\n> seems like we live with whatever those on are powerpc and probably can\n> on ARM64 as well.\n>\n>\n> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c\n> index 02831a396419..0ac7aa346c69 100644\n> --- a/arch/powerpc/kernel/pci-common.c\n> +++ b/arch/powerpc/kernel/pci-common.c\n> @@ -1740,15 +1740,3 @@ static void fixup_hide_host_resource_fsl(struct pci_dev *dev)\n> }\n> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);\n> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);\n> -\n> -static void fixup_vga(struct pci_dev *pdev)\n> -{\n> -\tu16 cmd;\n> -\n> -\tpci_read_config_word(pdev, PCI_COMMAND, &cmd);\n> -\tif ((cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) || !vga_default_device())\n> -\t\tvga_set_default_device(pdev);\n> -\n> -}\n> -DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,\n> -\t\t\t PCI_CLASS_DISPLAY_VGA, 8, fixup_vga);\n> diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c\n> index 76875f6299b8..9df4802c5f04 100644\n> --- a/drivers/gpu/vga/vgaarb.c\n> +++ b/drivers/gpu/vga/vgaarb.c\n> @@ -1468,6 +1468,21 @@ static int __init vga_arb_device_init(void)\n> \t\t\tvgaarb_info(dev, \"no bridge control possible\\n\");\n> \t}\n> \n> +\tif (!vga_default_device()) {\n> +\t\tlist_for_each_entry(vgadev, &vga_list, list) {\n> +\t\t\tstruct device *dev = &vgadev->pdev->dev;\n> +\t\t\tu16 cmd;\n> +\n> +\t\t\tpdev = vgadev->pdev;\n> +\t\t\tpci_read_config_word(pdev, PCI_COMMAND, &cmd);\n> +\t\t\tif (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {\n> +\t\t\t\tvgaarb_info(dev, \"setting as boot device\\n\");\n> +\t\t\t\tvga_set_default_device(pdev);\n> +\t\t\t\tbreak;\n> +\t\t\t}\n> +\t\t}\n> +\t}\n> +\n> \tpr_info(\"loaded\\n\");\n> \treturn rc;\n> }","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"A8YLbtqg\"; \n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=axtens.net header.i=@axtens.net\n\theader.b=\"rXPPJvwL\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3y23p22kWcz9sRg\n\tfor ;\n\tWed, 27 Sep 2017 13:53:30 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dx3Pa-0007We-Fk; Wed, 27 Sep 2017 03:53:26 +0000","from mail-pg0-x244.google.com ([2607:f8b0:400e:c05::244])\n\tby bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dx3PW-0007SY-6g for linux-arm-kernel@lists.infradead.org;\n\tWed, 27 Sep 2017 03:53:23 +0000","by mail-pg0-x244.google.com with SMTP id j16so7952075pga.2\n\tfor ;\n\tTue, 26 Sep 2017 20:53:00 -0700 (PDT)","from localhost (114-198-116-25.dyn.iinet.net.au. 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1781872,"web_url":"http://patchwork.ozlabs.org/comment/1781872/","msgid":"<20171006195118.GG25517@bhelgaas-glaptop.roam.corp.google.com>","list_archive_url":null,"date":"2017-10-06T19:51:18","subject":"Re: [PATCH v3 0/3] Split default display handling out from VGA\n\tarbiter","submitter":{"id":67298,"url":"http://patchwork.ozlabs.org/api/people/67298/","name":"Bjorn Helgaas","email":"helgaas@kernel.org"},"content":"On Wed, Sep 27, 2017 at 01:52:55PM +1000, Daniel Axtens wrote:\n> Hi Bjorn,\n> \n> Yes, this works:\n> \n> Tested-by: Daniel Axtens # arm64, ppc64-qemu-tcg\n\nI guess I was assuming you'd pick this up, but that doesn't really\nmake sense because I didn't give you a signed-off-by or anything.\nI'll post this with a changelog and signed-off-by so it doesn't get\nlost.\n\nI also noticed that I didn't correctly handle the powerpc quirk case\nwhere it doesn't require the device to be enabled at all. I'll try to\nfix that up, too.\n\nBjorn\n\n> > On Fri, Sep 01, 2017 at 05:27:41PM +1000, Daniel Axtens wrote:\n> >> This patch set:\n> >> \n> >> - splits the default display handling out from VGA arbiter, into its\n> >> own file and behind its own Kconfig option (and gives the functions\n> >> better names).\n> >> \n> >> - adds extra detection of default devices. To be nominated, the vga\n> >> arbiter and platform hooks must not have nominated a default. A\n> >> card will then only be nominated if it has a driver attached and\n> >> has IO or memory decoding enabled.\n> >> \n> >> - adds relevant documentation.\n> >> \n> >> The practical impact of this is improved X autoconfiguration on some\n> >> arm64 systems.\n> >\n> > I think I gave you bad advice about trying to separate the \"default\n> > device\" idea from the VGA arbiter.\n> >\n> > It is true that the \"VGA arbiter\" per se is related to routing the\n> > legacy VGA resources, and the arbiter currently only selects a default\n> > device if it finds a device to which those resources are routed.\n> >\n> > We have some cases where we want to select a default device that may\n> > not support the legacy VGA resources, or where they might not be\n> > routed to the device:\n> >\n> > - systems where we match the EFI framebuffer address with a BAR, and\n> > select that device as default,\n> >\n> > - powerpc systems where there may be no host bridge window that maps\n> > to the legacy VGA resources,\n> >\n> > - your ARM64 systems where the default device may be behind a bridge\n> > that doesn't support legacy VGA routing (PCI_BRIDGE_CTL_VGA)\n> >\n> > But I think trying to split the \"default device\" part out from the VGA\n> > arbiter ends up being overkill and making things more complicated\n> > instead of simpler.\n> >\n> > Would something like the following work for you as well as the powerpc\n> > case? On powerpc, we already use vga_set_default_device() to select a\n> > device that doesn't use legacy VGA resources, so maybe we can just do\n> > the same on ARM64?\n> >\n> > I suppose there might be wrinkles in how the arbiter deals with\n> > multiple graphics devices on those systems, since I don't think it\n> > identifies these devices that don't use the legacy resources, but it\n> > seems like we live with whatever those on are powerpc and probably can\n> > on ARM64 as well.\n> >\n> >\n> > diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c\n> > index 02831a396419..0ac7aa346c69 100644\n> > --- a/arch/powerpc/kernel/pci-common.c\n> > +++ b/arch/powerpc/kernel/pci-common.c\n> > @@ -1740,15 +1740,3 @@ static void fixup_hide_host_resource_fsl(struct pci_dev *dev)\n> > }\n> > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MOTOROLA, PCI_ANY_ID, fixup_hide_host_resource_fsl);\n> > DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID, fixup_hide_host_resource_fsl);\n> > -\n> > -static void fixup_vga(struct pci_dev *pdev)\n> > -{\n> > -\tu16 cmd;\n> > -\n> > -\tpci_read_config_word(pdev, PCI_COMMAND, &cmd);\n> > -\tif ((cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) || !vga_default_device())\n> > -\t\tvga_set_default_device(pdev);\n> > -\n> > -}\n> > -DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,\n> > -\t\t\t PCI_CLASS_DISPLAY_VGA, 8, fixup_vga);\n> > diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c\n> > index 76875f6299b8..9df4802c5f04 100644\n> > --- a/drivers/gpu/vga/vgaarb.c\n> > +++ b/drivers/gpu/vga/vgaarb.c\n> > @@ -1468,6 +1468,21 @@ static int __init vga_arb_device_init(void)\n> > \t\t\tvgaarb_info(dev, \"no bridge control possible\\n\");\n> > \t}\n> > \n> > +\tif (!vga_default_device()) {\n> > +\t\tlist_for_each_entry(vgadev, &vga_list, list) {\n> > +\t\t\tstruct device *dev = &vgadev->pdev->dev;\n> > +\t\t\tu16 cmd;\n> > +\n> > +\t\t\tpdev = vgadev->pdev;\n> > +\t\t\tpci_read_config_word(pdev, PCI_COMMAND, &cmd);\n> > +\t\t\tif (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {\n> > +\t\t\t\tvgaarb_info(dev, \"setting as boot device\\n\");\n> > +\t\t\t\tvga_set_default_device(pdev);\n> > +\t\t\t\tbreak;\n> > +\t\t\t}\n> > +\t\t}\n> > +\t}\n> > +\n> > \tpr_info(\"loaded\\n\");\n> > \treturn rc;\n> > }\n> \n>","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; 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