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header.from=i2se.com Authentication-Results: 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 98A9E6E15F; Wed, 7 Jul 2021 18:02:01 +0000 (UTC) Received: from mout.kundenserver.de (mout.kundenserver.de [212.227.126.133]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7EA036E15F for ; Wed, 7 Jul 2021 18:01:58 +0000 (UTC) Received: from [192.168.1.107] ([37.4.249.97]) by mrelayeu.kundenserver.de (mreue012 [212.227.15.167]) with ESMTPSA (Nemesis) id 1MZAvp-1lepfq1czR-00V5wU; Wed, 07 Jul 2021 20:01:51 +0200 Subject: Re: [PATCH RFC] drm/vc4: hdmi: Fix connector detect logic To: Maxime Ripard References: <1625520994-11065-1-git-send-email-stefan.wahren@i2se.com> <20210706095807.abx3v4wkc7ymwhjx@gilmour> <1ecde64b-3c91-dac6-e8e2-64a45022a40e@i2se.com> <20210706132131.4bylrs5u2xmypjcy@gilmour> <0ca8564a-03b8-e13f-b4c2-468bac877e4f@i2se.com> 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210707131156.4wo52roj4h5bg2f6@gilmour> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Content-Language: en-US X-Provags-ID: V03:K1:YkfdcGSEInAFzid3IyLxEXsiHgBtyY0vIklJCDclGwDyA4sQwo/ V5xJQpHMgd40wR2rgqiRN4DOJPXEa5rRfXibXCH6zDPeRULfeynFoAQ3zuj3KKTKb9bBJtu wQGCkkQP52HN+4KNrHmwkWh/NhgKQjXdAjc3Gh4jYBc36T+oTHXVJIlWEWBzQYtYfa2+K65 1Kr3jJ8Mv8xbR8DnuLhvA== X-UI-Out-Filterresults: notjunk:1;V03:K0:2ZQ40LaI3q0=:CoBXyMVEqoDaVLusDWRSi9 vxR+ZMZM6Av13Fog+gSJXC0y88Viss1RNg4Djx2i9uYRPvSyvu/TymTR05YCbFa312ADdvAbJ QBZuQ11POA2XwKIzP6rgNjgr5og05lONMN5EKa9k60wWIkHS6cbHn80GwXxso+x5fBcEiD6NF Ddb0j+6PDmENPmoILuc88prjTR8KEbgelD8b1k2PPSXwtU79llVIAqPkS4mbIPI/2XJ1YujPa 57V/8AJ67aNPh/NrNHCF+PdoDUTissfLfliFCQR+/UydFTcVNvmHBnljllnWHY5VChP4h4ied iJfMZyYeT8Y/vCvOyvGKaaqRKbBjsV3gO5spPSHomrJaAt2Jw1wTtBy4whXSSIkq9RL8Q0stb 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Tue, Jul 06, 2021 at 05:45:27PM +0200, Stefan Wahren wrote: >> Hi Maxime, >> >> Am 06.07.21 um 15:21 schrieb Maxime Ripard: >>> Hi Stefan, >>> >>> On Tue, Jul 06, 2021 at 12:48:05PM +0200, Stefan Wahren wrote: >>>> Am 06.07.21 um 11:58 schrieb Maxime Ripard: >>>>> Hi, >>>>> >>>>> On Mon, Jul 05, 2021 at 11:36:34PM +0200, Stefan Wahren wrote: >>>>>> Commit "drm/vc4: hdmi: Convert to gpiod" changes the behavior of >>>>>> vc4_hdmi_connector_detect() which results into CPU hangs in case t= here >>>>>> is no HDMI connected. Let's restore the old behavior. >>>>>> >>>>>> Reported-by: Nathan Chancellor >>>>>> Reported-by: Ojaswin Mujoo >>>>>> Fixes: 6800234ceee0 ("drm/vc4: hdmi: Convert to gpiod") >>>>>> Signed-off-by: Stefan Wahren >>>>> I already sent this patch last week: >>>>> >>>>> https://lore.kernel.org/dri-devel/20210628124257.140453-3-maxime@ce= rno.tech/ >>>> oops, i only looked in the July archive. >>>> >>>>> I'm not entirely sure how this could create a CPU hang though. With= outh >>>>> this patch, if the HPD GPIO is low, we would first try to retrieve = the >>>>> EDID, and then if it doesn't we would read the hotplug register. >>>> Yes, the real issue has been revealed by the original change and thi= s >>>> patch only "hides" it again. >>>>> The first is using a separate i2c controller (and even if it was in= the >>>>> same power domain, we have the pm_runtime_resume call), and the reg= ister >>>>> read should be fine too? >>>> Sorry, i don't have a clue and time for further investigations. >>>> >>>> Does it mean, you are not able to reproduce this issue? >>> On next-20210706 at least it works fine for me without an HDMI monito= r >>> connected, yes: >> which configuration do you use? Did you tried arm/multi_v7_defconfig? >> >> I tried yesterday mainline ("a180bd1d7e16173d965b263c5a536aa40afa2a2a"= ) >> with multi_v7_defconfig and the issue was there. > I can't boot multi_v7_defconfig on my setup, but I just tested multi_v7= > + a few options (UART, ethernet) built-in to be able to boot, and I > can't reproduce what you're seeing. It boots just fine without any > monitor attached. not sure how do you boot, but USB mass storage boot for Raspberry Pi 3 B Plus is broken since Linux 5.13 with multi_v7_defconfig [1]. But this is a completely different issue. To be more exact the hang in this case happens a few seconds after the UART console (ttyS1) becomes available. Here is my setup: Raspberry Pi 3 Plus DTS from mainline tree arm/multi_v7_defconfig Boot from SD card No U-Boot Rootfs: Raspberry Pi OS 32bit (May 7th 2021) VC4 firmware: 2021-04-30T13:47:07 Maybe next week, i have a little bit more time [1] - https://www.spinics.net/lists/arm-kernel/msg905208.html > > Maxime