RPI 3B+ fails to boot with vc4-fkms-v3d and Hyperpixel 4 TFT screen on kernel 4.19.59

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
linux, raspberry-pi
Domain
embedded-iot, operating-systems

Research direction

Start with /boot/config.txt and the vc4-fkms-v3d and hyperpixel4 overlays, then reproduce the boot panic on kernel 4.19.59 and compare it with the working 4.19.40 environment. Use the listed rpi-update revisions and uname/vcgencmd output to isolate the regression. Done means the HyperPixel 4 boots and works with vc4-fkms-v3d on the affected kernel.

Written by the indexing model from the issue text.

Description

Fixed - waiting for release

Enabling vc4-fkms-v3d on Raspbian at kernel 4.19.59 causes kernel panic on boot. I can confirm that on kernel 4.19.40 this does not happen and screen is working perfectly with vc4-fkms-v3d.

Screen working with rpi-update 6cb1da772a8c56f44591bec904046b15f1126949

pi@raspberrypi:~ $ vcgencmd version
Mar 27 2019 15:45:53
Copyright (c) 2012 Broadcom
version 2e98b31d18547962e564bdf88e57b3df7085c29b (clean) (release) (start)
pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.19.40-v7+ #1217 SMP Tue May 7 17:22:08 BST 2019 armv7l GNU/Linux

Fails to boot with rpi-update 2096a8d567eed47cb742ddb1ce9bf9ac25726980

pi@raspberrypi:~ $ vcgencmd version
Jul 23 2019 19:29:32
Copyright (c) 2012 Broadcom
version 4b11cff8f84f480b87a9e7a2a59d26014f4e7c91 (clean) (release) (start)
pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.19.59-v7+ #1246 SMP Tue Jul 23 19:18:42 BST 2019 armv7l GNU/Linux

/boot/config.txt

Enable audio (loads snd_bcm2835)

dtparam=audio=on

Enable GPU

dtoverlay=vc4-fkms-v3d

dtoverlay=hyperpixel4
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
framebuffer_width=800
framebuffer_height=480
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
dpi_output_format=0x7f216
display_rotate=3
hdmi_timings=480 0 10 16 59 800 0 15 113 15 0 0 0 60 0 32000000 6

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