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[209.85.217.47]) by smtp.gmail.com with ESMTPSA id e18sm541281vsp.7.2020.07.09.18.38.43 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2020 18:38:44 -0700 (PDT) Received: by mail-vs1-f47.google.com with SMTP id x205so2136511vsc.11 for ; Thu, 09 Jul 2020 18:38:43 -0700 (PDT) X-Received: by 2002:a67:e046:: with SMTP id n6mr20302730vsl.6.1594345122863; Thu, 09 Jul 2020 18:38:42 -0700 (PDT) MIME-Version: 1.0 References: <20191218143416.v3.6.Iaf8d698f4e5253d658ae283d2fd07268076a7c27@changeid> <20200710011935.GA7056@gentoo.org> In-Reply-To: <20200710011935.GA7056@gentoo.org> From: Doug Anderson Date: Thu, 9 Jul 2020 18:38:31 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v3 6/9] drm/bridge: ti-sn65dsi86: Use 18-bit DP if we can To: steev@kali.org X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Clark , Jernej Skrabec , Jeffrey Hugo , David Airlie , linux-arm-msm , Jonas Karlman , LKML , dri-devel , Bjorn Andersson , Neil Armstrong , Andrzej Hajda , Sean Paul , Laurent Pinchart , Steev Klimaszewski Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi, On Thu, Jul 9, 2020 at 6:19 PM Steev Klimaszewski wrote: > > Hi Doug, > > I've been testing 5.8 and linux-next on the Lenovo Yoga C630, and with this patch applied, there is really bad banding on the display. > > I'm really bad at explaining it, but you can see the differences in the following: > > 24bit (pre-5.8) - https://dev.gentoo.org/~steev/files/image0.jpg > > 18bit (5.8/linux-next) - https://dev.gentoo.org/~steev/files/image1.jpg Presumably this means that your panel is defined improperly? If the panel reports that it's a 6 bits per pixel panel but it's actually an 8 bits per pixel panel then you'll run into this problem. I would have to assume you have a bunch of out of tree patches to support your hardware since I don't see any device trees in linuxnext (other than cheza) that use this bridge chip. Otherwise I could try to check and confirm that was the problem. -Doug _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel