Hi @lex, On Thu, 9 Jan 2020 at 16:51, @lex <alex.mob...@gmail.com> wrote: > > Just adding some info, 5.3.y has the same issue.
Yes the bug is not fix mainline. I will open a discussion with the PWM maintainer Regards, Clement > > On Thursday, January 9, 2020 at 9:55:54 AM UTC-3, @lex wrote: >> >> I asked this because i have not touched the pwm-sun4i driver code, Only the >> MIPI-DSI on top of 5.4.8. >> >> On Thursday, January 9, 2020 at 9:25:11 AM UTC-3, @lex wrote: >>> >>> Thank you Vasily for the explanation. >>> >>> Is this a known bug or i have possibly introduced it while patching the >>> kernel? >>> >>> On Wednesday, January 8, 2020 at 9:51:03 PM UTC-3, Vasily Khoruzhick wrote: >>>> >>>> The issue is that sun4i_pwm_apply() calls sun4i_pwm_calculate() which >>>> calls clk_get_rate() while holding a spinlock and clk_get_rate() may >>>> sleep. >>>> >>>> It's a bug in pwm-sun4i driver. >>>> >>>> On Wed, Jan 8, 2020 at 4:19 PM @lex <alex....@gmail.com> wrote: >>>> > >>>> > I am doing some experiments with LCD7" with the kernel 5.4.8 and >>>> > occasionally i get this crash. >>>> > Can someone explain or give some directions on how to find the offending >>>> > error based on the crash log? Any idea what could be causing this? >>>> > >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.681388] BUG: scheduling while >>>> > atomic: gsd-backlight-h/3978/0x00000002 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688221] Modules linked in: >>>> > fuse rfkill dw_hdmi_i2s_audio snd_soc_hdmi_codec >>>> > panel_feiyang_fy07024di26a30d sunxi_cedrus(C) v4l2_mem2mem crct10dif_ce >>>> > sun8i_drm_hdmi videobuf2_dma_contig snd_soc_spdif_tx dw_hdmi >>>> > videobuf2_memops axp20x_adc cec videobuf2_v4l2 snd_soc_simple_card >>>> > sunxi_cir axp20x_usb_power axp20x_ac_power snd_soc_simple_card_utils >>>> > pinctrl_axp209 axp20x_battery phy_sun6i_mipi_dphy rc_core >>>> > videobuf2_common mali(O) sun6i_mipi_dsi sun50i_codec_analog videodev >>>> > sun8i_adda_pr_regmap crc_ccitt goodix sun8i_codec sun4i_i2s mc sun4i_drm >>>> > sun4i_frontend sun4i_tcon sun8i_mixer sun8i_tcon_top pwm_bl ip_tables >>>> > x_tables ipv6 nf_defrag_ipv6 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688331] CPU: 3 PID: 3978 >>>> > Comm: gsd-backlight-h Tainted: G C O 5.4.8 #1 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688334] Hardware name: >>>> > Pine64+ (DT) >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688339] Call trace: >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688357] >>>> > dump_backtrace+0x0/0x150 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688364] show_stack+0x14/0x20 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688374] dump_stack+0xb4/0xd8 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688384] >>>> > __schedule_bug+0x50/0x70 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688392] >>>> > __schedule+0x4bc/0x510 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688397] schedule+0x40/0xd0 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688403] >>>> > schedule_preempt_disabled+0x20/0x38 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688410] >>>> > __mutex_lock.isra.10+0x150/0x568 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688416] >>>> > __mutex_lock_slowpath+0x10/0x18 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688422] mutex_lock+0x38/0x40 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688430] >>>> > clk_prepare_lock+0x40/0xa0 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688437] >>>> > clk_get_rate+0x1c/0x70 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688446] >>>> > sun4i_pwm_apply+0xb4/0x450 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688453] >>>> > pwm_apply_state+0x64/0x1e8 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688464] >>>> > pwm_backlight_update_status+0xb8/0x198 [pwm_bl] >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688473] >>>> > backlight_device_set_brightness+0x64/0xb8 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688480] >>>> > brightness_store+0x78/0x90 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688488] >>>> > dev_attr_store+0x14/0x28 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688496] >>>> > sysfs_kf_write+0x3c/0x50 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688501] >>>> > kernfs_fop_write+0x144/0x230 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688511] __vfs_write+0x18/0x38 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688517] vfs_write+0xb4/0x1e0 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688524] ksys_write+0x68/0xf8 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688530] >>>> > __arm64_sys_write+0x18/0x20 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688540] >>>> > el0_svc_common.constprop.2+0x64/0x160 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688547] >>>> > el0_svc_handler+0x20/0x80 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688552] el0_svc+0x8/0xc >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.688694] BUG: scheduling while >>>> > atomic: gsd-backlight-h/3978/0x00000000 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695480] Modules linked in: >>>> > fuse rfkill dw_hdmi_i2s_audio snd_soc_hdmi_codec >>>> > panel_feiyang_fy07024di26a30d sunxi_cedrus(C) v4l2_mem2mem crct10dif_ce >>>> > sun8i_drm_hdmi videobuf2_dma_contig snd_soc_spdif_tx dw_hdmi >>>> > videobuf2_memops axp20x_adc cec videobuf2_v4l2 snd_soc_simple_card >>>> > sunxi_cir axp20x_usb_power axp20x_ac_power snd_soc_simple_card_utils >>>> > pinctrl_axp209 axp20x_battery phy_sun6i_mipi_dphy rc_core >>>> > videobuf2_common mali(O) sun6i_mipi_dsi sun50i_codec_analog videodev >>>> > sun8i_adda_pr_regmap crc_ccitt goodix sun8i_codec sun4i_i2s mc sun4i_drm >>>> > sun4i_frontend sun4i_tcon sun8i_mixer sun8i_tcon_top pwm_bl ip_tables >>>> > x_tables ipv6 nf_defrag_ipv6 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695558] CPU: 3 PID: 3978 >>>> > Comm: gsd-backlight-h Tainted: G WC O 5.4.8 #1 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695561] Hardware name: >>>> > Pine64+ (DT) >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695564] Call trace: >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695579] >>>> > dump_backtrace+0x0/0x150 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695583] show_stack+0x14/0x20 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695591] dump_stack+0xb4/0xd8 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695600] >>>> > __schedule_bug+0x50/0x70 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695605] >>>> > __schedule+0x4bc/0x510 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695610] schedule+0x40/0xd0 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695615] >>>> > do_notify_resume+0x1e0/0x398 >>>> > Jan 8 23:49:43 pine64-plus kernel: [ 5144.695620] work_pending+0x8/0x10 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.894318] BUG: scheduling while >>>> > atomic: gsd-backlight-h/3987/0x00000002 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901147] Modules linked in: >>>> > fuse rfkill dw_hdmi_i2s_audio snd_soc_hdmi_codec >>>> > panel_feiyang_fy07024di26a30d sunxi_cedrus(C) v4l2_mem2mem crct10dif_ce >>>> > sun8i_drm_hdmi videobuf2_dma_contig snd_soc_spdif_tx dw_hdmi >>>> > videobuf2_memops axp20x_adc cec videobuf2_v4l2 snd_soc_simple_card >>>> > sunxi_cir axp20x_usb_power axp20x_ac_power snd_soc_simple_card_utils >>>> > pinctrl_axp209 axp20x_battery phy_sun6i_mipi_dphy rc_core >>>> > videobuf2_common mali(O) sun6i_mipi_dsi sun50i_codec_analog videodev >>>> > sun8i_adda_pr_regmap crc_ccitt goodix sun8i_codec sun4i_i2s mc sun4i_drm >>>> > sun4i_frontend sun4i_tcon sun8i_mixer sun8i_tcon_top pwm_bl ip_tables >>>> > x_tables ipv6 nf_defrag_ipv6 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901246] CPU: 0 PID: 3987 >>>> > Comm: gsd-backlight-h Tainted: G WC O 5.4.8 #1 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901250] Hardware name: >>>> > Pine64+ (DT) >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901254] Call trace: >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901271] >>>> > dump_backtrace+0x0/0x150 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901277] show_stack+0x14/0x20 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901286] dump_stack+0xb4/0xd8 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901296] >>>> > __schedule_bug+0x50/0x70 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901303] >>>> > __schedule+0x4bc/0x510 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901307] schedule+0x40/0xd0 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901313] >>>> > schedule_preempt_disabled+0x20/0x38 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901319] >>>> > __mutex_lock.isra.10+0x150/0x568 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901324] >>>> > __mutex_lock_slowpath+0x10/0x18 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901330] mutex_lock+0x38/0x40 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901337] >>>> > clk_prepare_lock+0x40/0xa0 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901343] >>>> > clk_get_rate+0x1c/0x70 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901352] >>>> > sun4i_pwm_apply+0xb4/0x450 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901357] >>>> > pwm_apply_state+0x64/0x1e8 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901368] >>>> > pwm_backlight_update_status+0xb8/0x198 [pwm_bl] >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901375] >>>> > backlight_device_set_brightness+0x64/0xb8 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901381] >>>> > brightness_store+0x78/0x90 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901389] >>>> > dev_attr_store+0x14/0x28 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901396] >>>> > sysfs_kf_write+0x3c/0x50 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901401] >>>> > kernfs_fop_write+0x144/0x230 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901409] __vfs_write+0x18/0x38 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901415] vfs_write+0xb4/0x1e0 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901421] ksys_write+0x68/0xf8 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901427] >>>> > __arm64_sys_write+0x18/0x20 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901435] >>>> > el0_svc_common.constprop.2+0x64/0x160 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901441] >>>> > el0_svc_handler+0x20/0x80 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901446] el0_svc+0x8/0xc >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.901612] BUG: scheduling while >>>> > atomic: gsd-backlight-h/3987/0x00000000 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908388] Modules linked in: >>>> > fuse rfkill dw_hdmi_i2s_audio snd_soc_hdmi_codec >>>> > panel_feiyang_fy07024di26a30d sunxi_cedrus(C) v4l2_mem2mem crct10dif_ce >>>> > sun8i_drm_hdmi videobuf2_dma_contig snd_soc_spdif_tx dw_hdmi >>>> > videobuf2_memops axp20x_adc cec videobuf2_v4l2 snd_soc_simple_card >>>> > sunxi_cir axp20x_usb_power axp20x_ac_power snd_soc_simple_card_utils >>>> > pinctrl_axp209 axp20x_battery phy_sun6i_mipi_dphy rc_core >>>> > videobuf2_common mali(O) sun6i_mipi_dsi sun50i_codec_analog videodev >>>> > sun8i_adda_pr_regmap crc_ccitt goodix sun8i_codec sun4i_i2s mc sun4i_drm >>>> > sun4i_frontend sun4i_tcon sun8i_mixer sun8i_tcon_top pwm_bl ip_tables >>>> > x_tables ipv6 nf_defrag_ipv6 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908479] CPU: 0 PID: 3987 >>>> > Comm: gsd-backlight-h Tainted: G WC O 5.4.8 #1 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908482] Hardware name: >>>> > Pine64+ (DT) >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908486] Call trace: >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908500] >>>> > dump_backtrace+0x0/0x150 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908507] show_stack+0x14/0x20 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908517] dump_stack+0xb4/0xd8 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908526] >>>> > __schedule_bug+0x50/0x70 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908533] >>>> > __schedule+0x4bc/0x510 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908538] schedule+0x40/0xd0 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908545] >>>> > do_notify_resume+0x1e0/0x398 >>>> > Jan 8 23:49:45 pine64-plus kernel: [ 5146.908551] work_pending+0x8/0x10 >>>> > >>>> > >>>> > >>>> > 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