[PATCH 2/2] backlight: pwm: Add backlight-boot-off property

[Ajay kumar]

On Thu, Feb 26, 2015 at 1:36 PM, hl <hl at rock-chips.com> wrote:
>
> On 2015年02月26日 13:47, Ajay kumar wrote:
>>
>> Hi Huang,
>>
>> On Thu, Feb 26, 2015 at 9:09 AM, huang lin <hl at rock-chips.com> wrote:
>>>
>>> Add backlight-boot-off property, so we can keeping the
>>> backlight disabled at boot until it is enabled implicitly
>>> by a panel driver, or explicitly by userspace
>>>
>>> Signed-off-by: huang lin <hl at rock-chips.com>
>>>
>>> ---
>>>
>>>   drivers/video/backlight/pwm_bl.c | 4 ++++
>>>   1 file changed, 4 insertions(+)
>>>
>>> diff --git a/drivers/video/backlight/pwm_bl.c
>>> b/drivers/video/backlight/pwm_bl.c
>>> index 3a145a6..dece351 100644
>>> --- a/drivers/video/backlight/pwm_bl.c
>>> +++ b/drivers/video/backlight/pwm_bl.c
>>> @@ -319,6 +319,10 @@ static int pwm_backlight_probe(struct
>>> platform_device *pdev)
>>>          }
>>>
>>>          bl->props.brightness = data->dft_brightness;
>>> +
>>> +       if (of_find_property(pdev->dev.of_node, "backlight-boot-off",
>>> NULL))
>>> +               bl->props.power = FB_BLANK_POWERDOWN;
>>> +
>>
>> You need to check this. Originally, Thierry proposed it.
>> http://permalink.gmane.org/gmane.linux.drivers.devicetree/84604
>
> I have applied Thierry patch , and it can work. I think it should be merged,
> since i use three type of edp panels,
> they have same issue: when the backlight probe, the panel will visual
> glitches.
Right, the same problem exists on Exynos5800-peach-pi display!
I had tested this long back, and I think its not merged since the DT property
has an issue that "it doesn't really represent h/w property of the device".

>>
>>>          backlight_update_status(bl);
>>>
>>>          platform_set_drvdata(pdev, bl);
>>> --
>>> 1.9.1
>>>
>>>
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>>
>>
>>
>
> --
> 黄林
> 福州瑞芯微电子有限公司
> Fuzhou Rockchip Electronics Co.Ltd
> 福建省福州市铜盘路软件大道89号软件园A区21号楼(350003)
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> Email:hl at rock-chips.com
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>
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