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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org QW0gTWl0dHdvY2gsIDQuIE3DpHJ6IDIwMjYsIDEwOjQxOjUwIE1pdHRlbGV1cm9ww6Rpc2NoZSBT b21tZXJ6ZWl0IHNjaHJpZWIgQ2hhb3lpIENoZW46Cj4gRnJvbTogQ2hhb3lpIENoZW4gPGNoYW95 aS5jaGVuQHJvY2stY2hpcHMuY29tPgo+IAo+IFRoZSBSSzMzOTkgaGFzIHR3byBVU0IvRFAgY29t Ym8gUEhZIGFuZCBvbmUgQ0ROLURQIGNvbnRyb2xsZXIuIEFuZAo+IHRoZSBDRE4tRFAgY2FuIGJl IHN3aXRjaGVkIHRvIG91dHB1dCB0byBvbmUgb2YgdGhlIFBIWXMuIElmIGJvdGggcG9ydHMKPiBh cmUgcGx1Z2dlZCBpbnRvIERQLCBEUCB3aWxsIHNlbGVjdCB0aGUgZmlyc3QgcG9ydCBmb3Igb3V0 cHV0Lgo+IAo+IFRoaXMgcGF0Y2ggYWRkcyBzdXBwb3J0IGZvciBtdWx0aXBsZSBicmlkZ2VzLCBl bmFibGluZyB1c2VycyB0byBmbGV4aWJseQo+IHNlbGVjdCB0aGUgb3V0cHV0IHBvcnQuIEZvciBl YWNoIFBIWSBwb3J0LCBhIHNlcGFyYXRlIGVuY29kZXIgYW5kIGJyaWRnZQo+IGFyZSByZWdpc3Rl cmVkLgo+IAo+IFRoZSBjaGFuZ2UgaXMgYmFzZWQgb24gdGhlIERSTSBBVVggSFBEIGJyaWRnZSwg cmF0aGVyIHRoYW4gdGhlCj4gZXh0Y29uIGFwcHJvYWNoLiBUaGlzIHJlcXVpcmVzIHRoZSBEVCB0 byBjb3JyZWN0bHkgZGVzY3JpYmUgdGhlCj4gY29ubmVjdGlvbnMgYmV0d2VlbiB0aGUgZmlyc3Qg YnJpZGdlIGluIGJyaWRnZSBjaGFpbiBhbmQgRFAKPiBjb250cm9sbGVyLiBGb3IgZXhhbXBsZSwg dGhlIGJyaWRnZSBjaGFpbiBtYXkgYmUgbGlrZSB0aGlzOgo+IAo+IFBIWSBhdXggYmlyZGdlIC0+ IGZzYTQ0ODAgYW5hbG9nIGF1ZGlvIHN3aXRjaCBicmlkZ2UgLT4KPiBvbm5uLG5iN3ZwcTkwNG0g VVNCIHJlbWluZGVyIGJyaWRnZSAtPiBVU0ItQyBjb250cm9sbGVyIEFVWCBIUEQgYnJpZGdlCj4g Cj4gSW4gdGhpcyBjYXNlLCB0aGUgY29ubmVjdGlvbiByZWxhdGlvbnNoaXBzIGFtb25nIHRoZSBQ SFkgYXV4IGJyaWRnZQo+IGFuZCB0aGUgRFAgY29udG9ybGxlciBuZWVkIHRvIGJlIGRlc2NyaWJl ZCBpbiBEVC4KPiAKPiBJbiBhZGRpdGlvbiwgdGhlIGNkbl9kcF9wYXJzZV9uZXh0X2JyaWRnZV9k dCgpIHdpbGwgcGFyc2VzIGl0IGFuZAo+IGRldGVybWluZXMgd2hldGhlciB0byByZWdpc3RlciBv bmUgb3IgdHdvIGJyaWRnZXMuCj4gCj4gU2luY2UgdGhlcmUgaXMgb25seSBvbmUgRFAgY29udHJv bGxlciwgb25seSBvbmUgb2YgdGhlIFBIWSBwb3J0cyBjYW4KPiBvdXRwdXQgYXQgYSB0aW1lLiBU aGUga2V5IGlzIGhvdyB0byBzd2l0Y2ggYmV0d2VlbiBkaWZmZXJlbnQgUEhZcywKPiB3aGljaCBp cyBoYW5kbGVkIGJ5IGNkbl9kcF9zd2l0Y2hfcG9ydCgpIGFuZCBjZG5fZHBfZW5hYmxlKCkuCj4g Cj4gVGhlcmUgYXJlIHR3byBjYXNlczoKPiAKPiAxLiBOZWl0aGVyIGJyaWRnZSBpcyBlbmFibGVk LiBJbiB0aGlzIGNhc2UsIGJvdGggYnJpZGdlcyBjYW4KPiBpbmRlcGVuZGVudGx5IHJlYWQgdGhl IEVESUQsIGFuZCB0aGUgUEhZIHBvcnQgbWF5IHN3aXRjaCBiZWZvcmUKPiByZWFkaW5nIHRoZSBF RElELgo+IAo+IDIuIE9uZSBicmlkZ2UgaXMgYWxyZWFkeSBlbmFibGVkLiBJbiB0aGlzIGNhc2Us IG90aGVyIGJyaWRnZXMgYXJlIG5vdAo+IGFsbG93ZWQgdG8gcmVhZCB0aGUgRURJRC4gU28gd2Ug d2lsbCB0cnkgdG8gcmV0dXJuIHRoZSBjYWNoZWQgRURJRC4KPiAKPiBTaW5jZSB0aGUgc2NlbmFy aW8gb2YgdHdvIHBvcnRzIHBsdWcgaW4gYXQgdGhlIHNhbWUgdGltZSBpcyByYXJlLAo+IEkgZG9u J3QgaGF2ZSBhIGJvYXJkIHdoaWNoIHN1cHBvcnQgdHdvIFR5cGVDIGNvbm5lY3RvciB0byB0ZXN0 IHRoaXMuCj4gVGhlcmVmb3JlLCBJIHRlc3RlZCBmb3JjZWQgc3dpdGNoaW5nIG9uIGEgc2luZ2xl IFBIWSBwb3J0LCBhcyB3ZWxsIGFzCj4gb3V0cHV0IHVzaW5nIGEgZmFrZSBQSFkgcG9ydCBhbG9u Z3NpZGUgYSByZWFsIFBIWSBwb3J0Lgo+IAo+IFNpZ25lZC1vZmYtYnk6IENoYW95aSBDaGVuIDxj aGFveWkuY2hlbkByb2NrLWNoaXBzLmNvbT4KPiBSZXZpZXdlZC1ieTogTHVjYSBDZXJlc29saSA8 bHVjYS5jZXJlc29saUBib290bGluLmNvbT4KClJldmlld2VkLWJ5OiBIZWlrbyBTdHVlYm5lciA8 aGVpa29Ac250ZWNoLmRlPgoKCgotLSAKbGludXgtcGh5IG1haWxpbmcgbGlzdApsaW51eC1waHlA bGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwczovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9s aXN0aW5mby9saW51eC1waHkK 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B22ADCD5BA4 for ; 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Wed, 20 May 2026 11:13:37 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wPerm-00000004QD1-3uKY; Wed, 20 May 2026 11:13:36 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sntech.de; s=gloria202408; h=Content-Type:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Reply-To; bh=JRJUo4PXuYN1XhJVP15C+J6R1n1WzcWxMs+6lKcGyXw=; b=UIMfPi0n+2sixL8bSd9VaSky4K RHWEU0+Im4DinWDobN+TIklEhd6YinjY5ra47zGedlGtmCK3VcLA4SdnC/T9Wz+xbv787uc9NCmur oE/Pb9YEfcxcHLNfgJgespEqEWtw4n5OmHUUJpLH4OusgknEWNuQPRuBNqljFKhUo5+wDF9F6HKDp 7be2MVHEYOcgda44vWIrGG8KrxbAhoTugxFAOK6tqo9T6Y/e1aUu/oa9ixbiz6AQcrrmBIpaKFezU Ywj+BMGYYbwcxGr5YO+NvKrymVGhCxN9ndMlH+BhpCaopR6UWjmoW1Bez1Zy8MLmFiEb1e5C3LRV6 xx0+IXow==; From: Heiko Stuebner To: Heikki Krogerus , Greg Kroah-Hartman , Dmitry Baryshkov , Peter Chen , Luca Ceresoli , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vinod Koul , Kishon Vijay Abraham I , Sandy Huang , Andy Yan , Yubing Zhang , Frank Wang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Amit Sunil Dhamne , Dragan Simic , Johan Jonker , Diederik de Haas , Peter Robinson , Hugh Cole-Baker , Chaoyi Chen Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org, Chaoyi Chen Subject: Re: [PATCH v15 7/9] drm/rockchip: cdn-dp: Add multiple bridges to support PHY port selection Date: Wed, 20 May 2026 13:12:49 +0200 Message-ID: <12511061.0AQdONaE2F@phil> In-Reply-To: <20260304094152.92-8-kernel@airkyi.com> References: <20260304094152.92-1-kernel@airkyi.com> <20260304094152.92-8-kernel@airkyi.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260520_041334_969807_518A4368 X-CRM114-Status: GOOD ( 23.77 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org QW0gTWl0dHdvY2gsIDQuIE3DpHJ6IDIwMjYsIDEwOjQxOjUwIE1pdHRlbGV1cm9ww6Rpc2NoZSBT b21tZXJ6ZWl0IHNjaHJpZWIgQ2hhb3lpIENoZW46Cj4gRnJvbTogQ2hhb3lpIENoZW4gPGNoYW95 aS5jaGVuQHJvY2stY2hpcHMuY29tPgo+IAo+IFRoZSBSSzMzOTkgaGFzIHR3byBVU0IvRFAgY29t Ym8gUEhZIGFuZCBvbmUgQ0ROLURQIGNvbnRyb2xsZXIuIEFuZAo+IHRoZSBDRE4tRFAgY2FuIGJl IHN3aXRjaGVkIHRvIG91dHB1dCB0byBvbmUgb2YgdGhlIFBIWXMuIElmIGJvdGggcG9ydHMKPiBh cmUgcGx1Z2dlZCBpbnRvIERQLCBEUCB3aWxsIHNlbGVjdCB0aGUgZmlyc3QgcG9ydCBmb3Igb3V0 cHV0Lgo+IAo+IFRoaXMgcGF0Y2ggYWRkcyBzdXBwb3J0IGZvciBtdWx0aXBsZSBicmlkZ2VzLCBl bmFibGluZyB1c2VycyB0byBmbGV4aWJseQo+IHNlbGVjdCB0aGUgb3V0cHV0IHBvcnQuIEZvciBl YWNoIFBIWSBwb3J0LCBhIHNlcGFyYXRlIGVuY29kZXIgYW5kIGJyaWRnZQo+IGFyZSByZWdpc3Rl cmVkLgo+IAo+IFRoZSBjaGFuZ2UgaXMgYmFzZWQgb24gdGhlIERSTSBBVVggSFBEIGJyaWRnZSwg cmF0aGVyIHRoYW4gdGhlCj4gZXh0Y29uIGFwcHJvYWNoLiBUaGlzIHJlcXVpcmVzIHRoZSBEVCB0 byBjb3JyZWN0bHkgZGVzY3JpYmUgdGhlCj4gY29ubmVjdGlvbnMgYmV0d2VlbiB0aGUgZmlyc3Qg YnJpZGdlIGluIGJyaWRnZSBjaGFpbiBhbmQgRFAKPiBjb250cm9sbGVyLiBGb3IgZXhhbXBsZSwg dGhlIGJyaWRnZSBjaGFpbiBtYXkgYmUgbGlrZSB0aGlzOgo+IAo+IFBIWSBhdXggYmlyZGdlIC0+ IGZzYTQ0ODAgYW5hbG9nIGF1ZGlvIHN3aXRjaCBicmlkZ2UgLT4KPiBvbm5uLG5iN3ZwcTkwNG0g VVNCIHJlbWluZGVyIGJyaWRnZSAtPiBVU0ItQyBjb250cm9sbGVyIEFVWCBIUEQgYnJpZGdlCj4g Cj4gSW4gdGhpcyBjYXNlLCB0aGUgY29ubmVjdGlvbiByZWxhdGlvbnNoaXBzIGFtb25nIHRoZSBQ SFkgYXV4IGJyaWRnZQo+IGFuZCB0aGUgRFAgY29udG9ybGxlciBuZWVkIHRvIGJlIGRlc2NyaWJl ZCBpbiBEVC4KPiAKPiBJbiBhZGRpdGlvbiwgdGhlIGNkbl9kcF9wYXJzZV9uZXh0X2JyaWRnZV9k dCgpIHdpbGwgcGFyc2VzIGl0IGFuZAo+IGRldGVybWluZXMgd2hldGhlciB0byByZWdpc3RlciBv bmUgb3IgdHdvIGJyaWRnZXMuCj4gCj4gU2luY2UgdGhlcmUgaXMgb25seSBvbmUgRFAgY29udHJv bGxlciwgb25seSBvbmUgb2YgdGhlIFBIWSBwb3J0cyBjYW4KPiBvdXRwdXQgYXQgYSB0aW1lLiBU aGUga2V5IGlzIGhvdyB0byBzd2l0Y2ggYmV0d2VlbiBkaWZmZXJlbnQgUEhZcywKPiB3aGljaCBp cyBoYW5kbGVkIGJ5IGNkbl9kcF9zd2l0Y2hfcG9ydCgpIGFuZCBjZG5fZHBfZW5hYmxlKCkuCj4g Cj4gVGhlcmUgYXJlIHR3byBjYXNlczoKPiAKPiAxLiBOZWl0aGVyIGJyaWRnZSBpcyBlbmFibGVk LiBJbiB0aGlzIGNhc2UsIGJvdGggYnJpZGdlcyBjYW4KPiBpbmRlcGVuZGVudGx5IHJlYWQgdGhl IEVESUQsIGFuZCB0aGUgUEhZIHBvcnQgbWF5IHN3aXRjaCBiZWZvcmUKPiByZWFkaW5nIHRoZSBF RElELgo+IAo+IDIuIE9uZSBicmlkZ2UgaXMgYWxyZWFkeSBlbmFibGVkLiBJbiB0aGlzIGNhc2Us IG90aGVyIGJyaWRnZXMgYXJlIG5vdAo+IGFsbG93ZWQgdG8gcmVhZCB0aGUgRURJRC4gU28gd2Ug d2lsbCB0cnkgdG8gcmV0dXJuIHRoZSBjYWNoZWQgRURJRC4KPiAKPiBTaW5jZSB0aGUgc2NlbmFy aW8gb2YgdHdvIHBvcnRzIHBsdWcgaW4gYXQgdGhlIHNhbWUgdGltZSBpcyByYXJlLAo+IEkgZG9u J3QgaGF2ZSBhIGJvYXJkIHdoaWNoIHN1cHBvcnQgdHdvIFR5cGVDIGNvbm5lY3RvciB0byB0ZXN0 IHRoaXMuCj4gVGhlcmVmb3JlLCBJIHRlc3RlZCBmb3JjZWQgc3dpdGNoaW5nIG9uIGEgc2luZ2xl IFBIWSBwb3J0LCBhcyB3ZWxsIGFzCj4gb3V0cHV0IHVzaW5nIGEgZmFrZSBQSFkgcG9ydCBhbG9u Z3NpZGUgYSByZWFsIFBIWSBwb3J0Lgo+IAo+IFNpZ25lZC1vZmYtYnk6IENoYW95aSBDaGVuIDxj aGFveWkuY2hlbkByb2NrLWNoaXBzLmNvbT4KPiBSZXZpZXdlZC1ieTogTHVjYSBDZXJlc29saSA8 bHVjYS5jZXJlc29saUBib290bGluLmNvbT4KClJldmlld2VkLWJ5OiBIZWlrbyBTdHVlYm5lciA8 aGVpa29Ac250ZWNoLmRlPgoKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fXwpMaW51eC1yb2NrY2hpcCBtYWlsaW5nIGxpc3QKTGludXgtcm9ja2NoaXBAbGlz dHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3Rp bmZvL2xpbnV4LXJvY2tjaGlwCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gloria.sntech.de (gloria.sntech.de [185.11.138.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B6CE93D7D9E; 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arc=none smtp.client-ip=185.11.138.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=sntech.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sntech.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sntech.de header.i=@sntech.de header.b="UIMfPi0n" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sntech.de; s=gloria202408; h=Content-Type:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Reply-To; bh=JRJUo4PXuYN1XhJVP15C+J6R1n1WzcWxMs+6lKcGyXw=; b=UIMfPi0n+2sixL8bSd9VaSky4K RHWEU0+Im4DinWDobN+TIklEhd6YinjY5ra47zGedlGtmCK3VcLA4SdnC/T9Wz+xbv787uc9NCmur oE/Pb9YEfcxcHLNfgJgespEqEWtw4n5OmHUUJpLH4OusgknEWNuQPRuBNqljFKhUo5+wDF9F6HKDp 7be2MVHEYOcgda44vWIrGG8KrxbAhoTugxFAOK6tqo9T6Y/e1aUu/oa9ixbiz6AQcrrmBIpaKFezU Ywj+BMGYYbwcxGr5YO+NvKrymVGhCxN9ndMlH+BhpCaopR6UWjmoW1Bez1Zy8MLmFiEb1e5C3LRV6 xx0+IXow==; From: Heiko Stuebner To: Heikki Krogerus , Greg Kroah-Hartman , Dmitry Baryshkov , Peter Chen , Luca Ceresoli , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Vinod Koul , Kishon Vijay Abraham I , Sandy Huang , Andy Yan , Yubing Zhang , Frank Wang , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Amit Sunil Dhamne , Dragan Simic , Johan Jonker , Diederik de Haas , Peter Robinson , Hugh Cole-Baker , Chaoyi Chen Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, dri-devel@lists.freedesktop.org, Chaoyi Chen Subject: Re: [PATCH v15 7/9] drm/rockchip: cdn-dp: Add multiple bridges to support PHY port selection Date: Wed, 20 May 2026 13:12:49 +0200 Message-ID: <12511061.0AQdONaE2F@phil> In-Reply-To: <20260304094152.92-8-kernel@airkyi.com> References: <20260304094152.92-1-kernel@airkyi.com> <20260304094152.92-8-kernel@airkyi.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Am Mittwoch, 4. M=C3=A4rz 2026, 10:41:50 Mitteleurop=C3=A4ische Sommerzeit = schrieb Chaoyi Chen: > From: Chaoyi Chen >=20 > The RK3399 has two USB/DP combo PHY and one CDN-DP controller. And > the CDN-DP can be switched to output to one of the PHYs. If both ports > are plugged into DP, DP will select the first port for output. >=20 > This patch adds support for multiple bridges, enabling users to flexibly > select the output port. For each PHY port, a separate encoder and bridge > are registered. >=20 > The change is based on the DRM AUX HPD bridge, rather than the > extcon approach. This requires the DT to correctly describe the > connections between the first bridge in bridge chain and DP > controller. For example, the bridge chain may be like this: >=20 > PHY aux birdge -> fsa4480 analog audio switch bridge -> > onnn,nb7vpq904m USB reminder bridge -> USB-C controller AUX HPD bridge >=20 > In this case, the connection relationships among the PHY aux bridge > and the DP contorller need to be described in DT. >=20 > In addition, the cdn_dp_parse_next_bridge_dt() will parses it and > determines whether to register one or two bridges. >=20 > Since there is only one DP controller, only one of the PHY ports can > output at a time. The key is how to switch between different PHYs, > which is handled by cdn_dp_switch_port() and cdn_dp_enable(). >=20 > There are two cases: >=20 > 1. Neither bridge is enabled. In this case, both bridges can > independently read the EDID, and the PHY port may switch before > reading the EDID. >=20 > 2. One bridge is already enabled. In this case, other bridges are not > allowed to read the EDID. So we will try to return the cached EDID. >=20 > Since the scenario of two ports plug in at the same time is rare, > I don't have a board which support two TypeC connector to test this. > Therefore, I tested forced switching on a single PHY port, as well as > output using a fake PHY port alongside a real PHY port. >=20 > Signed-off-by: Chaoyi Chen > Reviewed-by: Luca Ceresoli Reviewed-by: Heiko Stuebner