Hi Maxime, Thanks for your V2 patch series! I'm testing it. This patch series is applied upon mainline kernel 5.7-rc2 cleanly and built. System can boot into console text mode, but no graphic UI. Get the error in vc5_hdmi_phy_init(), and full dmesg is at [1]: [ 5.587543] vc4_hdmi fef00700.hdmi: Unknown register ID 46 [ 5.587700] debugfs: Directory 'fef00700.hdmi' with parent 'vc4-hdmi' already present! [ 5.588070] vc4_hdmi fef00700.hdmi: vc4-hdmi-hifi <-> fef00700.hdmi mapping ok [ 5.588076] vc4_hdmi fef00700.hdmi: ASoC: no DMI vendor name! [ 5.588263] vc4-drm gpu: bound fef00700.hdmi (ops vc4_hdmi_ops) [ 5.588299] vc4_hdmi fef05700.hdmi: Unknown register ID 46 [ 5.588373] debugfs: Directory 'vc4-hdmi' with parent 'asoc' already present! [ 5.588673] vc4_hdmi fef05700.hdmi: vc4-hdmi-hifi <-> fef05700.hdmi mapping ok [ 5.588677] vc4_hdmi fef05700.hdmi: ASoC: no DMI vendor name! [ 5.588809] vc4-drm gpu: bound fef05700.hdmi (ops vc4_hdmi_ops) [ 5.588854] vc4-drm gpu: bound fe806000.vec (ops vc4_vec_ops) [ 5.588897] vc4-drm gpu: bound fe004000.txp (ops vc4_txp_ops) [ 5.588934] vc4-drm gpu: bound fe400000.hvs (ops vc4_hvs_ops) [ 5.588990] vc4-drm gpu: bound fe206000.pixelvalve (ops vc4_crtc_ops) [ 5.589030] vc4-drm gpu: bound fe207000.pixelvalve (ops vc4_crtc_ops) [ 5.589074] vc4-drm gpu: bound fe20a000.pixelvalve (ops vc4_crtc_ops) [ 5.589106] vc4-drm gpu: bound fe216000.pixelvalve (ops vc4_crtc_ops) [ 5.589145] vc4-drm gpu: bound fec12000.pixelvalve (ops vc4_crtc_ops) [ 5.589294] checking generic (3e513000 6d8c00) vs hw (0 ffffffffffffffff) [ 5.589297] fb0: switching to vc4drmfb from simple [ 5.589433] Console: switching to colour dummy device 80x25 [ 5.589481] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 5.589816] [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0 [ 5.601079] ------------[ cut here ]------------ [ 5.601095] WARNING: CPU: 2 PID: 127 at drivers/gpu/drm/vc4/vc4_hdmi_phy.c:413 vc5_hdmi_phy_init+0x7ac/0x2078 [ 5.601097] Modules linked in: [ 5.601103] CPU: 2 PID: 127 Comm: kworker/2:1 Not tainted 5.7.0-rc2-00091-ga181df59a930 #7 [ 5.601105] Hardware name: Raspberry Pi 4 Model B (DT) [ 5.601112] Workqueue: events deferred_probe_work_func [ 5.601116] pstate: 20000005 (nzCv daif -PAN -UAO) [ 5.601119] pc : vc5_hdmi_phy_init+0x7ac/0x2078 [ 5.601123] lr : vc4_hdmi_encoder_enable+0x1b8/0x1ac0 [ 5.601124] sp : ffff80001217b410 [ 5.601126] x29: ffff80001217b410 x28: ffff0000ec6370f0 [ 5.601129] x27: ffff0000f650d400 x26: 000000008a500000 [ 5.601132] x25: ffff8000113b4ac0 x24: 0000000000002060 [ 5.601135] x23: 000000000a500000 x22: 0000000000000300 [ 5.601137] x21: 0000000008d9ee20 x20: ffff0000ec535080 [ 5.601140] x19: 000000010989e7c0 x18: 0000000000000000 [ 5.601142] x17: 0000000000000001 x16: 0000000000005207 [ 5.601145] x15: 00004932ad293c92 x14: 0000000000000137 [ 5.601147] x13: ffff800010015000 x12: 0000000000000001 [ 5.601150] x11: 0000000000000001 x10: 0000000000000000 [ 5.601152] x9 : 0000000000000000 x8 : ffff800010015038 [ 5.601154] x7 : 0000000000000001 x6 : ffff80001217b368 [ 5.601157] x5 : 0000000000000000 x4 : 000000000000004c [ 5.601159] x3 : 0000000000000000 x2 : ffff8000113b4ac0 [ 5.601162] x1 : ffff8000120c5f44 x0 : 00000000dc8984ff [ 5.601164] Call trace: [ 5.601169] vc5_hdmi_phy_init+0x7ac/0x2078 [ 5.601172] vc4_hdmi_encoder_enable+0x1b8/0x1ac0 [ 5.601176] drm_atomic_helper_commit_modeset_enables+0x224/0x248 [ 5.601179] vc4_atomic_complete_commit+0x400/0x558 [ 5.601182] vc4_atomic_commit+0x1e0/0x200 [ 5.601185] drm_atomic_commit+0x4c/0x60 [ 5.601190] drm_client_modeset_commit_atomic.isra.0+0x17c/0x238 [ 5.601192] drm_client_modeset_commit_locked+0x5c/0x198 [ 5.601195] drm_client_modeset_commit+0x30/0x58 [ 5.601201] drm_fb_helper_restore_fbdev_mode_unlocked+0x78/0xe0 [ 5.601204] drm_fb_helper_set_par+0x30/0x68 [ 5.601208] fbcon_init+0x3d4/0x598 [ 5.601212] visual_init+0xb0/0x108 [ 5.601214] do_bind_con_driver+0x1d0/0x3a8 [ 5.601217] do_take_over_console+0x144/0x208 [ 5.601219] do_fbcon_takeover+0x68/0xd8 [ 5.601222] fbcon_fb_registered+0x100/0x118 [ 5.601226] register_framebuffer+0x1f4/0x338 [ 5.601229] __drm_fb_helper_initial_config_and_unlock+0x2f8/0x4a0 [ 5.601232] drm_fbdev_client_hotplug+0xd4/0x1b0 [ 5.601235] drm_fbdev_generic_setup+0xb0/0x130 [ 5.601238] vc4_drm_bind+0x184/0x1a0 [ 5.601241] try_to_bring_up_master+0x168/0x1c8 [ 5.601244] __component_add+0xa4/0x170 [ 5.601246] component_add+0x14/0x20 [ 5.601248] vc4_vec_dev_probe+0x20/0x30 [ 5.601252] platform_drv_probe+0x54/0xa8 [ 5.601254] really_probe+0xd8/0x320 [ 5.601256] driver_probe_device+0x58/0xf0 [ 5.601258] __device_attach_driver+0x84/0xc8 [ 5.601263] bus_for_each_drv+0x78/0xc8 [ 5.601265] __device_attach+0xe4/0x140 [ 5.601267] device_initial_probe+0x14/0x20 [ 5.601269] bus_probe_device+0x9c/0xa8 [ 5.601271] deferred_probe_work_func+0x74/0xb0 [ 5.601276] process_one_work+0x1bc/0x338 [ 5.601279] worker_thread+0x1f8/0x428 [ 5.601282] kthread+0x138/0x158 [ 5.601286] ret_from_fork+0x10/0x1c [ 5.601288] ---[ end trace cfba0996218c3f3d ]--- [1]: https://gist.github.com/starnight/2236cf350737e3b0e9f05135fc7c910e Jian-Hong Pan
