Hi Sachin,
Could you test it with removed display-timings::clock-frequency property. Currently in arch/arm/boot/dts/exynos4210-origen.dts display-timings::clock-frequency is set to 50000, this is incorrect value. With the property removed fimd calculates clock-frequency from other properties with assumption of default 60Hz refresh rate.
It could work before because of_get_fb_videomode calculated refresh rate from display-timings and with clock 50000, the result was 0(due to rounding down in some division), so fimd assumed he should use default refresh rate of 60Hz.
Regards Andrzej
On 09/18/2013 07:22 AM, Sachin Kamat wrote:
Hi Andrzej ,
I was testing the latest Linux kernel release (v3.12-rc1) on Exynos4210 based Origen board. I found a display regression with that. I do not get any display on the LCD (other than backlight) with the latest kernel. Git bisect pointed me to the following commit: 111e6055d4e0d35c6a4b6cd37d7bb00a88eaffb4 ("drm/exynos: fimd: replace struct fb_videomode with videomode"). Reverting this patch does not cause the issue. Let me know if you need any other info to help identify the problem.