Here is a workaround that seems to be working so far for the kernel 5.3 and
5.4.
Small Obs:
During the tests, dimming the lcd backlight up and down for one hour worked
without issues.
I let the board idle for 6 hrs, worked 5 min on other things and had a
crash. I could not recover the log to investigate it, but does not seem to
be related to the issue.
BR
@lex
On Friday, January 10, 2020 at 12:02:44 PM UTC-3, @lex wrote:
>
> Hi Clément,
>
> [image: backligth.png]
> I can confirm that the patch fixed the issue (just need to run for a day
> to make it does not break something else). MIPI-DSI worked out-of-the-box,
> i just noticed the refresh rate seems to be a bit wrong, maybe i tested it
> during the night and now it is possible to note this in daylight.
> Any chance we see a back-port on this soon?
>
> Thank you!
>
> BR
> @lex
>
>
>
> On Friday, January 10, 2020 at 10:22:20 AM UTC-3, @lex wrote:
>>
>> Hi Clément,
>>
>> I can still see some diff from what i have working in 5.4.8. Maybe this
>> is redundant and not necessary. Anyway, I will test it soon.
>>
>> BR,
>> @lex
>>
>> --- /arm/ubuntu/nanopi-a64-linux-next/linux-next/drivers/gpu/drm/sun4i/
>> sun6i_mipi_dsi.h
>> +++ /arm/ubuntu/nanopi-a64-linux-next/linux-5.4.8/drivers/gpu/drm/sun4i/
>> sun6i_mipi_dsi.h
>> @@ -13,7 +13,11 @@
>> #include <drm/drm_encoder.h>
>> #include <drm/drm_mipi_dsi.h>
>> -#define SUN6I_DSI_TCON_DIV 4
>> +#include <linux/regulator/consumer.h>
>> +
>> +struct sun6i_dsi_variant {
>> + bool has_mod_clk;
>> +};
>> struct sun6i_dsi {
>> struct drm_connector connector;
>> @@ -29,8 +33,10 @@
>> struct device *dev;
>> struct sun4i_drv *drv;
>> + struct sun4i_tcon *tcon;
>> struct mipi_dsi_device *device;
>> struct drm_panel *panel;
>> + const struct sun6i_dsi_variant *variant;
>> };
>> static inline struct sun6i_dsi *host_to_sun6i_dsi(struct mipi_dsi_host *
>> host)
>>
>>
>> On Friday, January 10, 2020 at 4:50:35 AM UTC-3, Clément Péron wrote:
>>>
>>> Hi Alex
>>>
>>> Le ven. 10 janv. 2020 à 01:03, @lex <[email protected]> a écrit :
>>>
>>>> Hi Clément,
>>>>
>>>> Sure, i will try to apply the MIPI-DSI patch to linux-next, but i see
>>>> there are a lot of changes to be made and this can take some time.
>>>>
>>>
>>> MIPI DSI is already applied in Linux-next for a64.
>>>
>>>
>>>
>>>> I will report back when i get the results.
>>>>
>>> Thanks
>>> Clement
>>>
>>>
>>> Thanks,
>>>>
>>> @lex
>>>>
>>>> On Thursday, January 9, 2020 at 8:33:13 PM UTC-3, Clément Péron wrote:
>>>>>
>>>>> Hi Alex,
>>>>>
>>>>> On Thu, 9 Jan 2020 at 22:51, @lex <[email protected]> wrote:
>>>>> >
>>>>> > Clément,
>>>>> >
>>>>> > It usually crashes while changing the LCD backlight.
>>>>> > Not sure it is related, but some time later the board enters in a
>>>>> sleep mode and shutdown itself (don't resume from that). Screen saver and
>>>>> power savings are disabled.
>>>>>
>>>>> Yes totally makes sense,
>>>>>
>>>>> Could you test with this patch on top of linux-next ?
>>>>> https://patchwork.kernel.org/patch/11326439/
>>>>>
>>>>> Thanks
>>>>> Clément
>>>>>
>>>>>
>>>>> >
>>>>> > BR,
>>>>> > @lex
>>>>> >
>>>>> >
>>>>> >
>>>>> > On Thursday, January 9, 2020 at 4:59:39 PM UTC-3, Clément Péron
>>>>> wrote:
>>>>> >>
>>>>> >> Hi,
>>>>> >>
>>>>> >> On Thu, 9 Jan 2020 at 20:39, @lex <[email protected]> wrote:
>>>>> >> >
>>>>> >> > Hi Clément,
>>>>> >> >
>>>>> >> > Looks like Kernel 5.5 will be affected too.
>>>>> >> Yes but if a fix is sent it will be backported to all the kernels
>>>>> >> affected still maintained.
>>>>> >>
>>>>> >> What command do you do to reproduce this?
>>>>> >>
>>>>> >> Thanks,
>>>>> >> Clément
>>>>> >>
>>>>> >> >
>>>>> >> > Thank you.
>>>>> >> >
>>>>> >> > BR,
>>>>> >> > @lex
>>>>> >> >
>>>>> >> >
>>>>> >> > On Thursday, January 9, 2020 at 2:03:43 PM UTC-3, Clément Péron
>>>>> wrote:
>>>>> >> >>
>>>>> >> >> Hi @lex,
>>>>> >> >>
>>>>> >> >> On Thu, 9 Jan 2020 at 16:51, @lex <[email protected]> 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 <[email protected]>
>>>>> 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
>>>>> >> >> >>>> >
>>>>> >> >> >>>> >
>>>>> >> >> >>>> >
>>>>> >> >> >>>> > B.R
>>>>> >> >> >>>> >
>>>>> >> >> >>>> > --
>>>>> >> >> >>>> > You received this message because you are subscribed to
>>>>> the Google Groups "linux-sunxi" group.
>>>>> >> >> >>>> > To unsubscribe from this group and stop receiving emails
>>>>> from it, send an email to [email protected].
>>>>> >> >> >>>> > To view this discussion on the web, visit
>>>>> https://groups.google.com/d/msgid/linux-sunxi/91a0725f-5ce3-4244-ba98-88c1ea7e7574%40googlegroups.com.
>>>>>
>>>>>
>>>>> >> >> >
>>>>> >> >> > --
>>>>> >> >> > You received this message because you are subscribed to the
>>>>> Google Groups "linux-sunxi" group.
>>>>> >> >> > To unsubscribe from this group and stop receiving emails from
>>>>> it, send an email to [email protected].
>>>>> >> >> > To view this discussion on the web, visit
>>>>> https://groups.google.com/d/msgid/linux-sunxi/a6a5a51d-1fe5-4eef-bbd1-c285260f8fd4%40googlegroups.com.
>>>>>
>>>>>
>>>>> >> >
>>>>> >> > --
>>>>> >> > You received this message because you are subscribed to the
>>>>> Google Groups "linux-sunxi" group.
>>>>> >> > To unsubscribe from this group and stop receiving emails from it,
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--- a/drivers/pwm/pwm-sun4i.c
+++ b/drivers/pwm/pwm-sun4i.c
@@ -215,9 +215,6 @@
}
}
- spin_lock(&sun4i_pwm->ctrl_lock);
- ctrl = sun4i_pwm_readl(sun4i_pwm, PWM_CTRL_REG);
-
if ((cstate.period != state->period) ||
(cstate.duty_cycle != state->duty_cycle)) {
u32 period, duty, val;
@@ -227,11 +224,13 @@
&duty, &period, &prescaler);
if (ret) {
dev_err(chip->dev, "period exceeds the maximum value\n");
- spin_unlock(&sun4i_pwm->ctrl_lock);
if (!cstate.enabled)
clk_disable_unprepare(sun4i_pwm->clk);
return ret;
}
+
+ spin_lock(&sun4i_pwm->ctrl_lock);
+ ctrl = sun4i_pwm_readl(sun4i_pwm, PWM_CTRL_REG);
if (PWM_REG_PRESCAL(ctrl, pwm->hwpwm) != prescaler) {
/* Prescaler changed, the clock has to be gated */
@@ -247,6 +246,9 @@
sun4i_pwm->next_period[pwm->hwpwm] = jiffies +
usecs_to_jiffies(cstate.period / 1000 + 1);
sun4i_pwm->needs_delay[pwm->hwpwm] = true;
+ } else {
+ spin_lock(&sun4i_pwm->ctrl_lock);
+ ctrl = sun4i_pwm_readl(sun4i_pwm, PWM_CTRL_REG);
}
if (state->polarity != PWM_POLARITY_NORMAL)
