I fixed the problem by modifying drivers/pwm/core.c as following:
in function pwmchip_add_with_polarity
for (i = 0; i < chip->npwm; i++) {
pwm = &chip->pwms[i];
pwm->chip = chip;
pwm->pwm = chip->base + i;
pwm->hwpwm = i;
pwm->state.polarity = polarity;
+pwm->state.period = 50000;
+pwm->state.duty_cycle = 50000;
+pwm->state.enabled = true;
if (chip->ops->get_state)
chip->ops->get_state(chip, pwm, &pwm->state);
radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
}
It's a hack but its working
On Monday, March 20, 2017 at 11:39:43 AM UTC+2, Eyad Majali wrote:
>
> Yes it did , I think I have to modify the source code of pwm-sun4i and
> init it to 100% duty cycle , is there any easier solution ?
>
> On Monday, March 20, 2017 at 6:25:49 AM UTC+2, Icenowy Zheng wrote:
>>
>>
>>
>> 20.03.2017, 04:21, "Eyad Majali" <[email protected]>:
>> > I did these changes before I know about the patch to prevent complete
>> lcd turn off , yes I'm on 4.11-rc , the problem is mainly with pwm-sun4i
>> > when its enabled alone without pwm_bl the screen brightness is very
>> low, enabling pwm_bl doesnt solve the problem until i rmmod it the load it
>> again
>>
>> Does it really prevented complete LCD blacklight turn off on your tablet?
>> At least it worked on my A33 ;-)
>>
>> > On Sunday, March 19, 2017 at 6:29:35 PM UTC+2, Icenowy Zheng wrote:
>> >
>> >> 20.03.2017, 00:08, "Quentin Schulz" <[email protected]>:
>> >>> Hi,
>> >>>
>> >>> On 19/03/2017 15:59, Eyad Majali wrote:
>> >>>> Hi,
>> >>>> pwm is configured in dtsi , when the module loads screen brightness
>> >>>> decrease to minimum ( barely sees anything) how to fix that ?
>> >>>> also when i enable pwm-bl it turns off the screen completely , but
>> when
>> >>>> i removed the enable-gpios the result was the same with pwm-sun4i
>> alone but
>> >>>> if i rmmod pwm-bl and then modprobe pwm-bl it will load the default
>> >>>> brightness level correctly
>> >>>> any help is apreciated , Thanks
>> >>>
>> >>> I think this patch can help you:
>> https://patchwork.kernel.org/patch/9631655/
>> >>
>> >> P.S. are you using 4.11-rc now?
>> >>
>> >> This patch only takes effect on 4.11-rc.
>> >>
>> >>>
>> >>> Quentin
>> >>>
>> >>>> --
>> >>>> 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]
>> >>>> <mailto:[email protected]>.
>> >>>> For more options, visit https://groups.google.com/d/optout.
>> >>>
>> >>> --
>> >>> Quentin Schulz, Free Electrons
>> >>> Embedded Linux and Kernel engineering
>> >>> http://free-electrons.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].
>> >>> For more options, visit https://groups.google.com/d/optout.
>>
>
--
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].
For more options, visit https://groups.google.com/d/optout.
