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mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A254B6E1FB; Tue, 2 Jun 2020 20:16:32 +0000 (UTC) X-Greylist: delayed 467 seconds by postgrey-1.36 at gabe; Tue, 02 Jun 2020 20:16:30 UTC Received: from mout.kundenserver.de (mout.kundenserver.de [217.72.192.74]) by gabe.freedesktop.org (Postfix) with ESMTPS id 365A76E185 for ; Tue, 2 Jun 2020 20:16:30 +0000 (UTC) Received: from [192.168.1.164] ([37.4.249.202]) by mrelayeu.kundenserver.de (mreue109 [212.227.15.183]) with ESMTPSA (Nemesis) id 1MIdW7-1jjjuh3yUP-00EhX5; Tue, 02 Jun 2020 22:03:15 +0200 Subject: Re: [PATCH v3 032/105] drm/vc4: crtc: Enable and disable the PV in atomic_enable / disable To: Eric Anholt , Dave Stevenson , Maxime Ripard References: <20200602141228.7zbkob7bw3owajsq@gilmour> From: Stefan Wahren Autocrypt: addr=stefan.wahren@i2se.com; keydata= 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1.0 In-Reply-To: Content-Language: en-US X-Provags-ID: V03:K1:1J7oYsG/Yo02Aq3V6XiK7w6ODlDPc/wWdYvmaa7UOlcPUKhmd51 le3Jvqoz3OFCXrxLVvbxOJRd5i+HYGOmsXWB50exjoV0iXQvnB1L57OslzfrAOR3jki8kwi D/S5FN3OhaopISp0x4J3G+MyLx+uUIEmrG0uG/uXtU8o5dNsDJ8vNs9OB2zknn8l22k29jR sM5LZg0daBod79keQZ34w== X-UI-Out-Filterresults: notjunk:1;V03:K0:DDfBHjKjHys=:gAeFcQ4XvPPnKKPYZAySyY tIu+vZD6rAMtRVLsltERFlh5Sjpkjz31AbS0MH4WPcehuG6IVT6YbtqikjTWuizgWRQZPKxK4 ro7LwVjvRSirVc5ETKpqQYDQgHSJ+8VLAsP7QWJBqpWcbFAQxlTwIT76zdQIarKomnScjs7Il 7s9pL+f15lL+neQhh18DUnh71K2xUa6X9FGxGvhrZKzYY2/gUn/jg8YTntmVXHhFocPz1jApU Pa/oQm131FC3nuGmXw5mxqOqujbjJNzA79U86zXtwqeuQRxRXd1IZkn2GVNmUbWgCFrTfA/ig mSv4k0LVfEfRict6bICFl79URm6SkpdrKg+5KWylsSa7AYGr8Kb1MOqp/mrn5yxiTvnmO49DI bR7EHzmo8H8JTrveM2OLyHKNeuTAqn5KNRhOaCMkybZ2YmotS1tnISDawPRKdNSHswq3m0ilq hPO0mqezfpSHRHcCXa2hgvoiV3RGoXzsD2dEB9tvy2FSrBluRuzZOWVEyoM57T9rl5iKtZ2NS 0gJ4N2KNc9tSh4jSIF0tdsLimgBGh3cbB455c8u1P4mMijVGnxs73ZGXT993+r/S3yFt7NQf1 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2020 at 15:12, Maxime Ripard wrote: >>> Hi Eric >>> >>> On Wed, May 27, 2020 at 09:54:44AM -0700, Eric Anholt wrote: >>>> On Wed, May 27, 2020 at 8:50 AM Maxime Ripard wrote: >>>>> The VIDEN bit in the pixelvalve currently being used to enable or disable >>>>> the pixelvalve seems to not be enough in some situations, which whill end >>>>> up with the pixelvalve stalling. >>>>> >>>>> In such a case, even re-enabling VIDEN doesn't bring it back and we need to >>>>> clear the FIFO. This can only be done if the pixelvalve is disabled though. >>>>> >>>>> In order to overcome this, we can configure the pixelvalve during >>>>> mode_set_no_fb, but only enable it in atomic_enable and flush the FIFO >>>>> there, and in atomic_disable disable the pixelvalve again. >>>> What displays has this been tested with? Getting this sequencing >>>> right is so painful, and things like DSI are tricky to get to light >>>> up. >>> That FIFO is between the HVS and the HDMI PVs, so this was obviously >>> tested against that. Dave also tested the DSI output IIRC, so we should >>> be covered here. >> DSI wasn't working on the first patch set that Maxime sent - I haven't >> tested this one as yet but will do so. >> DPI was working early on to both an Adafruit 800x480 DPI panel, and >> via a VGA666 as VGA. >> HDMI is obviously working. >> VEC is being ignored now. The clock structure is more restricted than >> earlier chips, so to get the required clocks for the VEC without using >> fractional divides it compromises the clock that other parts of the >> system can run at (IIRC including the ARM). That's why the VEC has to >> be explicitly enabled for the firmware to enable it as the only >> output. It's annoying, but that's just a restriction of the chip. > I'm more concerned with "make sure we don't regress pre-pi4 with this > series" than "pi4 displays all work from the beginning" unfortuntely i can confirm this. With this patch series (using Maxime's git repo with multi_v7_defconfig) my Raspberry Pi 3 B hangs up while starting X (screen stays black, heartbeat stops, no more output at the debug UART). AFAIR v2 didn't had this issue. Stefan > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel