From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: [PATCH v3 1/6] vga_switcheroo: Add support for switching only the DDC Date: Tue, 6 Oct 2015 13:10:00 +0200 Message-ID: <20151006111000.GG3383@phenom.ffwll.local> References: <20151006072724.GO3383@phenom.ffwll.local> <20151006101048.GA15385@wunner.de> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mail-wi0-f177.google.com (mail-wi0-f177.google.com [209.85.212.177]) by gabe.freedesktop.org (Postfix) with ESMTPS id B6CB96E2BF for ; Tue, 6 Oct 2015 04:07:08 -0700 (PDT) Received: by wicfx3 with SMTP id fx3so160577488wic.1 for ; Tue, 06 Oct 2015 04:07:07 -0700 (PDT) Content-Disposition: inline In-Reply-To: <20151006101048.GA15385@wunner.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Lukas Wunner Cc: William Brown , dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org T24gVHVlLCBPY3QgMDYsIDIwMTUgYXQgMTI6MTA6NDhQTSArMDIwMCwgTHVrYXMgV3VubmVyIHdy b3RlOgo+IEhpIERhbmllbCwKPiAKPiB0aGFuayB5b3UgZm9yIHRha2luZyBhIGxvb2sgYXQgdGhl IHBhdGNoIHNldCBhbmQgc2hlcGhlcmRpbmcgdGhpcwo+IHRocm91Z2ggdGhlIHJldmlldyBwcm9j ZXNzLgo+IAo+IE9uIFR1ZSwgT2N0IDA2LCAyMDE1IGF0IDA5OjI3OjI0QU0gKzAyMDAsIERhbmll bCBWZXR0ZXIgd3JvdGU6Cj4gPiBPbiBGcmksIEF1ZyAxNCwgMjAxNSBhdCAwNjo1MDoxNVBNICsw MjAwLCBMdWthcyBXdW5uZXIgd3JvdGU6Cj4gPiA+ICAgICBEb24ndCBsb2NrIHZnYXNyX211dGV4 IGluIF9sb2NrX2RkYygpIC8gX3VubG9ja19kZGMoKSwgaXQgY2FuIGNhdXNlCj4gPiA+ICAgICBk ZWFkbG9ja3MgYmVjYXVzZSAoYSkgZHVyaW5nIHN3aXRjaCAod2l0aCB2Z2Fzcl9tdXRleCBhbHJl YWR5IGhlbGQpLAo+ID4gPiAgICAgR1BVIGlzIHdva2VuIGFuZCBwcm9iZXMgaXRzIG91dHB1dHMs IHRyaWVzIHRvIHJlLWFjcXVpcmUgdmdhc3JfbXV0ZXgKPiA+ID4gICAgIHRvIGxvY2sgRERDIGxp bmVzOyAoYikgTGlrZXdpc2UgZHVyaW5nIHN3aXRjaCwgR1BVIGlzIHN1c3BlbmRlZCBhbmQKPiA+ ID4gICAgIGNhbGxzIGNhbmNlbF9kZWxheWVkX3dvcmtfc3luYygpIHRvIHN0b3Agb3V0cHV0IHBv bGxpbmcsIGlmIHBvbGwKPiA+ID4gICAgIHRhc2sgaXMgcnVubmluZyBhdCB0aGlzIG1vbWVudCB3 ZSBtYXkgd2FpdCBmb3JldmVyIGZvciBpdCB0byBmaW5pc2guCj4gPiA+IAo+ID4gPiAgICAgSW5z dGVhZCwgbG9jayBkZGNfbG9jayB3aGVuIHVucmVnaXN0ZXJpbmcgdGhlIGhhbmRsZXIgYmVjYXVz ZSB0aGUKPiA+ID4gICAgIG9ubHkgcmVhc29uIHdoeSB3ZSdkIHdhbnQgdG8gbG9jayB2Z2Fzcl9t dXRleCBpbiBfbG9ja19kZGMoKSAvCj4gPiA+ICAgICBfdW5sb2NrX2RkYygpIGlzIHRvIGJsb2Nr IHRoZSBoYW5kbGVyIGZyb20gZGlzYXBwZWFyaW5nIHdoaWxlIEREQwo+ID4gPiAgICAgbGluZXMg YXJlIHN3aXRjaGVkLgo+ID4gCj4gPiBTaG91bGRuJ3Qgd2UgYWxzbyB0YWtlIHRoZSBuZXcgbG9v ayBpbiByZWdpc3Rlcl9oYW5kbGVyLCBmb3IgY29uc2lzdGVuY3k/Cj4gPiBJIGtub3cgdGhhdCBp ZiB5b3UgbG9vayB0aGUgbXV4IHByb3ZpZGVyIHRvbyBsYXRlIGl0J3MgZmFpcmx5IGhvcGVsZXNz IC4uLgo+IAo+IFdpdGggdGhlIGNob3NlbiBhcHByb2FjaCB0aGF0J3Mgbm90IG5lY2Vzc2FyeTog dmdhX3N3aXRjaGVyb29fbG9ja19kZGMoKQo+IHJlY29yZHMgaW4gdmdhc3JfcHJpdi5vbGRfZGRj X293bmVyIGlmIHRoZXJlJ3Mgbm8gbXV4Ogo+IAo+IAlpZiAoIXZnYXNyX3ByaXYuaGFuZGxlciB8 fCAhdmdhc3JfcHJpdi5oYW5kbGVyLT5zd2l0Y2hfZGRjKSB7Cj4gCQl2Z2Fzcl9wcml2Lm9sZF9k ZGNfb3duZXIgPSAtRU5PREVWOwo+IAkJcmV0dXJuIC1FTk9ERVY7Cj4gCX0KPiAKPiBBbmQgdmdh X3N3aXRjaGVyb29fdW5sb2NrX2RkYygpIGRvZXMgbm90aGluZyBpZiB2Z2Fzcl9wcml2Lm9sZF9k ZGNfb3duZXIKPiBpcyBuZWdhdGl2ZSwgaXQganVzdCByZWxlYXNlcyB0aGUgbG9jayBhbmQgcmV0 dXJuczoKPiAKPiAJaWYgKHZnYXNyX3ByaXYub2xkX2RkY19vd25lciA+PSAwKSB7Cj4gCQlpZCA9 IHZnYXNyX3ByaXYuaGFuZGxlci0+Z2V0X2NsaWVudF9pZChwZGV2KTsKPiAJCWlmICh2Z2Fzcl9w cml2Lm9sZF9kZGNfb3duZXIgIT0gaWQpCj4gCQkJcmV0ID0gdmdhc3JfcHJpdi5oYW5kbGVyLT5z d2l0Y2hfZGRjKAo+IAkJCQkJCSAgICAgdmdhc3JfcHJpdi5vbGRfZGRjX293bmVyKTsKPiAJfQo+ IAltdXRleF91bmxvY2soJnZnYXNyX3ByaXYuZGRjX2xvY2spOwo+IAo+IFNvIGl0IGhhcyBubyBj b25zZXF1ZW5jZXMgaWYgdGhlIG11eCByZWdpc3RlcnMgYmV0d2VlbiB0aGUgY2FsbHMgdG8KPiBf bG9ja19kZGMoKSBhbmQgX3VubG9ja19kZGMoKS4KPiAKPiAKPiA+IEFsc28gd2hpbGUgcmVhZGlu ZyB0aGUgcGF0Y2ggSSByZWFsaXplZCB0aGF0IHRoZSBuZXcgbG9jayByZWFsbHkgcHJvdGVjdHMK PiA+IGh3IHN0YXRlIChpbnN0ZWFkIG9mIG91ciBzb2Z0d2FyZS1zaWRlIHRyYWNraW5nIGFuZCBk cml2ZXIgcmVzdW1lL3N1c3BlbmQKPiA+IGNvZGUpLiBBbmQgYXQgbGVhc3QgbXlzZWxmIEkgaGF2 ZSBubyBpZGVhIHdoYXQgdmdhc3IgbWVhbnMsIHNvIHdoYXQgYWJvdXQKPiA+IHJlbmFtaW5nIGl0 IHRvIGh3X211dGV4PyBXZSBoYXZlIHRoaXMgcGF0dGVybiBvZiBsb3ctbGV2ZWwgbG9ja3MgdG8g YXZvaWQKPiA+IGNvbmN1cnJlbnQgaHcgYWNjZXNzIGluIGEgbG90IG9mIHBsYWNlcyBsaWtlIGky YywgZHBfYXV4LCBhbmQgaXQncyB2ZXJ5Cj4gPiBvZnRlbiBjYWxsZWQgaHdfbG9jayBvciBzaW1p bGFyLgo+IAo+IEhtLCBod19sb2NrIHNvdW5kcyBhIGJpdCBhbWJpZ3VvdXMuCj4gCj4gdmdhc3Jf bXV0ZXggaXMgcmVhbGx5IGEgY2F0Y2gtYWxsIHRoYXQgcHJvdGVjdHMgYWNjZXNzIHRvIHRoZSB2 Z2Fzcl9wcml2Cj4gc3RydWN0dXJlIGFuZCBhbHNvIHByb3RlY3RzIHZhcmlvdXMgaGFyZHdhcmUg c3RhdGUuIChQb3dlciBzdGF0ZSBvZiBlYWNoCj4gR1BVLCBtdXggc3RhdGUuKSBVcCB1bnRpbCBu b3cgdGhpcyBhcHByb2FjaCB3b3JrZWQgZmluZSwgaXQgbG9va3MgbGlrZQo+IHRoZXJlIHdhcyBu byBuZWVkIGZvciBhZGRpdGlvbmFsIGxvY2tzLiBXZSBtYXkgbmVlZCB0byBtb3ZlIHRvIG1vcmUK PiBmaW5lLWdyYWluZWQgbG9ja2luZyBhcyBuZXcgZmVhdHVyZXMgZ2V0IGFkZGVkIHRvIHZnYV9z d2l0Y2hlcm9vLgo+IFRoZSBuZXdseSBpbnRyb2R1Y2VkIGRkY19sb2NrIGlzIGEgZmlyc3Qgc3Rl cCBhbmQgSSB0aGluayBpcyBhcHRseQo+IG5hbWVkIHNpbmNlIGl0IG9ubHkgcHJvdGVjdHMgdGhl IG11eCBzdGF0ZSBmb3IgdGhlIEREQyBsaW5lcy4KCk9vcHMgc29ycnkgbWl4ZWQgdXAgdGhlIG5h bWVzLiBJIG1lYW50IHJlbmFtZSB0aGUgZGRjX2xvY2sgdG8gaHdfbG9jawpzaW5jZSBpdCBwcm90 ZWN0cyBhIGJpdCBtb3JlIHRoYW4ganVzdCB0aGUgZGRjIChpdCBwcm90ZWN0cyB0aGUgZW50aXJl IGh3CnN3aXRjaCBzdGF0ZSBzaW5jZSB3ZSBncmFiIGl0IGJvdGggZm9yIGRjYyBzd2l0Y2hpbmcg YW5kIGZvciBmdWxsLWJsb3duCnN3aXRjaGluZyBvZiBldmVyeXRoaW5nKS4KPiAKPiAKPiA+IFdy dCB0aGUgb3ZlcmFsbCBwYXRjaCBzZXJpZXMsIGNhbiB5b3UgcGxzIGhhZ2dsZSBkcml2ZXItbWFp bnRhaW5lcnMgKGdtdXgsCj4gPiByYWRlb24sIG5vdXZlYXUpIGZvciBhY2tzL3Jldmlld3M/IHNj cmlwdHMvZ2V0X21haW50YWluZXJzLnBsIHNob3VsZCBoZWxwLgo+IAo+IFdpbGwgZG8uCj4gCj4g Cj4gPiBBbHNvLCB0aGUgcmV2aXNlZCBkb2Nib29rIHBhdGNoIHNlZW1zIHRvIGJlIG1pc3Npbmcg ZnJvbSB0aGlzIGl0ZXJhdGlvbiwKPiA+IHBsZWFzZSBmb2xsb3cgdXAgd2l0aCB0aGF0IG9uZS4K PiAKPiBUaGUgZG9jYm9vayBwYXRjaCBwb3N0ZWQgU2VwdGVtYmVyIDE3IGF1dG9tYXRpY2FsbHkg cGlja3MgdXAgdGhlCj4ga2VybmVsLWRvYyBmb3IgdGhlIG5ldyBmdW5jdGlvbnMgdGhyb3VnaCB0 aGUgIUUgZGlyZWN0aXZlLgoKSSBhc2tlZCBmb3IgdGhlIGluY2x1c2lvbiB0byBiZSBtb3ZlZCB0 byBkcm0udG1wbCBpbnN0ZWFkIG9mIGNyZWF0aW5nIGEKbmV3IGRvY2Jvb2suCgo+IEhvd2V2ZXIg SSB1c2VkIG1hcmtkb3duIHN5bnRheCBmb3IgdGhlIHVuc29ydGVkIGxpc3RzIGluIHRoZSBET0MK PiBzZWN0aW9ucywgc28gaXQgd2lsbCBsb29rIGEgYml0IGZ1bm55IHVubGVzcyBtYXJrZG93biBn ZXRzIG1lcmdlZCwKPiB3aGljaCBhcyB3ZSBhbGwga25vdyBpcyBjb250ZW50aW91cy4gKFdoaWNo IGlzIHNhZCwgdGhvdWdoIEkgY2FuCj4gdW5kZXJzdGFuZCBKb25hdGhhbiBDb3JiZXQncyBjb25j ZXJucy4pCj4gCj4gCj4gQnkgdGhlIHdheSwgSmFuaSBoYXMga2luZGx5IHByb3ZpZGVkIGEgUmV2 aWV3ZWQtQnk6IGZvciBwYXRjaCA2IG9mCj4gdGhlIHZnYV9zd2l0Y2hlcm9vIGRvY3Mgc2VyaWVz LiBUaGUgcGF0Y2ggaXMgbm90IGRlcGVuZGVudCBvbiB0aGUKPiBwcmVjZWRpbmcgcGF0Y2ggNSB3 aGljaCBpcyBhd2FpdGluZyBhbiBhY2sgZnJvbSBUYWthc2hpLCBzbyBjb3VsZAo+IGJlIG1lcmdl ZCBub3c6Cj4gW1BBVENIIDA2LzE1XSB2Z2Ffc3dpdGNoZXJvbzogVXNlIGVudW0gdmdhX3N3aXRj aGVyb29fc3RhdGUgaW5zdGVhZAo+IAo+IFBhdGNoZXMgNyBhbmQgOCBhcmUgc2ltaWxhcmx5IHRy aXZpYWwgY2xlYW51cHM6Cj4gW1BBVENIIDA3LzE1XSB2Z2Ffc3dpdGNoZXJvbzogVXNlIFZHQV9T V0lUQ0hFUk9PX1VOS05PV05fSUQgaW5zdGVhZAo+IFtQQVRDSCAwOC8xNV0gdmdhX3N3aXRjaGVy b286IFVzZSBlbnVtIHZnYV9zd2l0Y2hlcm9vX2NsaWVudF9pZAo+IAo+IEFuZCBwYXRjaCAxMCBo YXMgZ290dGVuIGEgUmV2aWV3ZWQtQnk6IGZyb20gVGFrYXNoaToKPiBbUEFUQ0ggMTAvMTVdIEFM U0E6IGhkYSAtIFNwZWxsIHZnYV9zd2l0Y2hlcm9vIGNvbnNpc3RlbnRseQoKSG0gdGhvc2UgcGF0 Y2hlcyBhcmVuJ3QgaW4gdGhpcyBzZXJpZXMsIHRoYXQgbWFrZXMgaXQgcmVhbGx5IGhhcmQgZm9y IG1lCnRvIGtub3cgd2hhdCdzIHN0aWxsIHBlbmRpbmcuIEkgdGhpbmsgaXQgd291bGQgYmUgYmVz dCB0byByZXNlbmQKX2V2ZXJ5dGhpbmdfLCBzbyBpbmNsdWRpbmcgZG9jcyBhbmQgY2xlYW51cHMg YW5kIGFsbCB0aGF0LiBPdGhlcndpc2UgSQp0aGluayB0aGlzIHdpbGwgdGFrZSBhIGxvdCBsb25n ZXIgdGhhbiBuZWNlc3NhcnkgdG8gcHVsbCBpbi4KCkFsc28gd2hlbiByZXNlbmRpbmcgcGF0Y2hl cyB1bmNoYW5nZWQgcGxlYXNlIGRpcmVjdGx5IGFkZCByLWIgdGFncyB5b3UndmUKY29sbGVjdGVk IGFscmVhZHkgLSByZXBseWluZyB0b3AtbGV2ZWwgd2l0aCB0aGVtIGFsbCBhZ2FpbiBtYWtlcyBp dCBhIGJpdApoYXJkZXIgdG8gc29ydCBldmVyeXRoaW5nIG91ciBoZXJlIGZvciBtZS4gQW5kIG9u ZSBzbWFsbCBuaXQ6IFRoZSB1c3VhbApzdHlsZSBmb3IgcGF0Y2ggYm9tYmluZyBpcyBmbGF0IHRo cmVhZGluZywgbm90IG5lc3RlZC4gSXQgc2hvdWxkIGJlIHRoZQpkZWZhdWx0IGZvciBuZXctaXNo IGdpdCwgYnV0IGlmIHRoYXQncyBub3QgdGhlIGNhc2UgcGxlYXNlIHVzZSBnaXQKc2VuZC1lbWFp bCAtLW5vLWNoYWluLXJlcGx5LXRvLiBOb3RlIGFsc28gaWYgeW91IGdlbmVyYXRlIHBhdGNoZXMg Zmlyc3QKd2l0aCBnaXQgZm9ybWF0LXBhdGNoIHRoYXQgaGFzIGEgc2VwYXJhdGUga25vYiBmb3Ig ZGVlcCB0aHJlYWRpbmcsIHlvdQpuZWVkIHRvIGRpc2FibGUgYm90aCBpaXJjIHRvIGF2b2lkIGRl ZXAgdGhyZWFkaW5nLCB0aGVyZSBpdCdzIGdpdApmb3JtYXQtcGF0Y2ggLS10aHJlYWQ9c2hhbGxv dy4KLURhbmllbAotLSAKRGFuaWVsIFZldHRlcgpTb2Z0d2FyZSBFbmdpbmVlciwgSW50ZWwgQ29y cG9yYXRpb24KaHR0cDovL2Jsb2cuZmZ3bGwuY2gKX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX18KZHJpLWRldmVsIG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlz dHMuZnJlZWRlc2t0b3Aub3JnCmh0dHA6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9s aXN0aW5mby9kcmktZGV2ZWwK