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

[hl <hl@rock-chips.com>]

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@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@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.

>
>>          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)
Addr:No.21 Building, A District, No.89, software Boulevard Fuzhou, Fujian,PRC
Email:hl@rock-chips.com
Tel:+86-591-83991906/07
  
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