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[209.85.166.51]) by smtp.gmail.com with ESMTPSA id b18sm9041359iln.8.2021.08.30.09.02.11 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Aug 2021 09:02:12 -0700 (PDT) Received: by mail-io1-f51.google.com with SMTP id q3so20554961iot.3 for ; Mon, 30 Aug 2021 09:02:11 -0700 (PDT) X-Received: by 2002:a02:c7d2:: with SMTP id s18mr17206234jao.22.1630339331487; Mon, 30 Aug 2021 09:02:11 -0700 (PDT) MIME-Version: 1.0 References: <20210726231351.655302-1-bjorn.andersson@linaro.org> In-Reply-To: From: Doug Anderson Date: Mon, 30 Aug 2021 09:01:58 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC] drm/msm/dp: Allow attaching a drm_panel To: Bjorn Andersson Cc: Rob Clark , Sean Paul , David Airlie , Daniel Vetter , linux-arm-msm , LKML , Abhinav Kumar , Stephen Boyd , Kuogee Hsieh , dri-devel , Vara Reddy , freedreno , Chandan Uddaraju Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Sat, Aug 28, 2021 at 7:40 AM Bjorn Andersson wrote: > > On Fri 27 Aug 15:52 CDT 2021, Doug Anderson wrote: > > > Hi, > > > > On Mon, Jul 26, 2021 at 4:15 PM Bjorn Andersson > > wrote: > > > > > > +static int dp_parser_find_panel(struct dp_parser *parser) > > > +{ > > > + struct device_node *np = parser->pdev->dev.of_node; > > > + int rc; > > > + > > > + rc = drm_of_find_panel_or_bridge(np, 2, 0, &parser->drm_panel, NULL); > > > > Why port 2? Shouldn't this just be port 1 always? The yaml says that > > port 1 is "Output endpoint of the controller". We should just use port > > 1 here, right? > > > > I thought port 1 was the link to the Type-C controller, didn't give it a > second thought and took the next available. > > But per the binding it makes sense that the panel is the "Output > endpoint of the controller" and I guess one will have either a Type-C > controller or a panel - even after the DP rework? Right, my understanding is that "port 1" is the output port irregardless of whether you're outputting to a panel or a DP connector. I think the only case it would make sense to add a new port is if it was possible for the output to be connected to both a panel and a DP port simultaneously. ...but that doesn't make sense. -Doug