On 2015?02?26? 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. > >> backlight_update_status(bl); >> >> platform_set_drvdata(pdev, bl); >> -- >> 1.9.1 >> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in >> the body of a message to majordomo at vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- ?? ??????????? Fuzhou Rockchip Electronics Co.Ltd ?????????????89????A?21??(350003) Addr:No.21 Building, A District, No.89, software Boulevard Fuzhou, Fujian,PRC Email:hl at rock-chips.com Tel:+86-591-83991906/07 **************************************************************************************** ???????????????????????????????????????????? ???? ???????????????????????????????????????? ???????????????????????????????????????????? ?????????????????? IMPORTANT NOTICE: This email is from Fuzhou Rockchip Electronics Co., Ltd .The contents of this email and any attachments may contain information that is privileged, confidential and/or exempt from disclosure under applicable law and relevant NDA. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information is STRICTLY PROHIBITED. Please immediately contact the sender as soon as possible and destroy the material in its entirety in any format. Thank you. ********************************************************************************
