On Tue, Sep 27, 2022 at 09:25:54AM +0200, Maxime Ripard wrote: > Hi Stefan, > > On Mon, Sep 26, 2022 at 08:50:12PM +0200, Stefan Wahren wrote: > > Am 26.09.22 um 14:47 schrieb Maxime Ripard: > > > On Mon, Sep 26, 2022 at 02:40:48PM +0200, Marc Kleine-Budde wrote: > > > > On 26.09.2022 14:08:04, Stefan Wahren wrote: > > > > > Hi Marc, > > > > > > > > > > Am 26.09.22 um 12:21 schrieb Marc Kleine-Budde: > > > > > > On 22.09.2022 17:06:00, Maxime Ripard wrote: > > > > > > > > I'm on a Raspberry Pi 3 Model B+ running current Debian testing ARM64, > > > > > > > > using Debian's v5.19 kernel (Debian's v5.18 was working flawless). > > > > > > > > > > > > > > > > | [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034] > > > > > > > > | [ 0.000000] Linux version 5.19.0-1-arm64 (debian-kernel@xxxxxxxxxxxxxxxx) (gcc-11 (Debian 11.3.0-5) 11.3.0, GNU ld (GNU Binutils for Debian) 2.38.90.20220713) #1 SMP Debian 5.19.6-1 (2022-0 > > > > > > > > 9-01) > > > > > > > > | [ 0.000000] Machine model: Raspberry Pi 3 Model B+ > > > > > > > > | [ 3.747500] raspberrypi-firmware soc:firmware: Attached to firmware from 2022-03-24T13:21:11 > > > > > > > > > > > > > > > > As soon a the vc4 module is loaded the following warnings hits 4 > > > > > > > > times, then the machine stops. > > > > > > [...] > > > > > > > > > > > > > The warning itself is fixed, both upstream and in stable (5.19.7). > > > > > > Ok. Debian is using 5.19.6 > > > > > > > > > > > > > It shouldn't have any relation to the hang though. Can you share your > > > > > > > setup? > > > > > > - config.txt: > > > > > > > > > > > > -------->8-------->8-------->8-------->8-------- > > > > > > gpu_mem=16 > > > > > > disable_splash=1 > > > > > > > > > > > > arm_64bit=1 > > > > > > enable_uart=1 > > > > > > uart_2ndstage=1 > > > > > > > > > > > > os_prefix=/u-boot/ > > > > > > > > > > > > [pi3] > > > > > > force_turbo=1 > > > > > > -------->8-------->8-------->8-------->8-------- > > > > > > > > > > > > - Raspberry Pi 3 Model B+ > > > > > > - no HDMI connected > > > > > Does it mean, the issue only occurs without HDMI connected? > > > > > If you didn't test with HDMI yet, could you please do? > > > > The error occurs with HDMI not connected, as vc4 is the gfx driver I > > > > thought this might be of interest. :) > > > > > > > > I don't have a HDMI monitor here, but I'll come back to you as soon as I > > > > get access to one (might take some time). > > > It's not the first time an issue like this one would occur. I'm trying > > > to make my Pi3 boot again, and will try to bisect the issue. > > > > yes the issue is only triggered without HDMI connected. I was able to > > reproduce with an older vc4 firmware from 2020 (don't want to upgrade yet). > > Kernel was also an arm64 build with defconfig. > > > > Here some rough starting point for bisection: > > > > 5.18.0 good > > 5.19.0 bad > > 5.19.6 bad > > Sorry it took a bit of time, it looks like I found another bug while > trying to test this yesterday. > > Your datapoints are interesting though. I have a custom configuration > and it does boot 5.19 without an HDMI connected. > > So I guess it leaves us with either the firmware version being different > (I'm using a newer version, from March 2022), or the configuration. I'll > test with defconfig. So it turns out compiling vc4 as a module is the culprit. It's not clear to me why at this point, but the first register write in vc4_hdmi_reset stalls. Maxime
