On Tue, Dec 11, 2018 at 10:19 PM Maxime Ripard <maxime.ripard@xxxxxxxxxxx> wrote: > > On Mon, Dec 10, 2018 at 09:47:19PM +0530, Jagan Teki wrote: > > Video start delay can be computed by subtracting total vertical > > timing with front porch timing and with adding 1 delay line for TCON. > > > > BSP code form BPI-M64-bsp is computing video start delay as > > (from linux-sunxi/ > > drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c) > > > > u32 vfp = panel->lcd_vt - panel->lcd_y - panel->lcd_vbp; > > => (panel->lcd_vt) - panel->lcd_y - (panel->lcd_vbp) > > => (timmings->ver_front_porch + panel->lcd_vbp + panel->lcd_y) > > - panel->lcd_y - (panel->lcd_vbp) > > => timmings->ver_front_porch + panel->lcd_vbp + panel->lcd_y > > - panel->lcd_y - panel->lcd_vbp > > => timmings->ver_front_porch > > > > So, update the start delay computation accordingly. > > > > Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> > > Even though it's a bit better now on my A33 board and I don't have the > white stripes on the bottom of the display, there's still some > flickering with your patches applied. > > Bisecting it seems to point at that patch, but reverting it doesn't > make the issue go away, so it's not really clear which one exactly is > at fault. > > So, just like I asked in your v4, twice, > > http://lists.infradead.org/pipermail/linux-arm-kernel/2018-November/615339.html I don't know how can I comment here. Not quite clearly understand your setup, because I have verified 3 different panels from different vendors one with 2-lane, another with 4-lane and one with video format and another one is burstmode format. I even verified with the clock rate and register details. Please suggest me, what can look further on this. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
