Yes. This is DSI command to panel. I saw same problem in 96boards.org discuss. On Android its all ok, but on Linux flickering.
Yes, panel in video mode. Where is pageflip event in driver? Or where add sleep/delay between update buffer? I think buffer copy by DMA (module) to panel. But for this needed some request event (or irq). In this case I want to try catch problem by adding software delay. And make decision about this problem, it with display, hardware or with something else. ср, 11 дек. 2019 г. в 19:52, Rob Clark <robdcl...@gmail.com>: > On Wed, Dec 11, 2019 at 6:22 AM ggermanres <ggerman...@gmail.com> wrote: > > > > Hello. > > > > I have question about MSM Driver. > > > > I using Dragonboard 410 with ili9881 display. This is hobby project. > This display from xiaomi redmi 3x/4x. I made PCB board for connect them. I > changed dts, created panel driver (this all on buildroot with my config). > All ok. Run platform. I saw linux console. Freedreno (opengl test app) is > working fine. But I saw flickering like on old monitor I saw from phone. I > tried changing timings, but this helped a little bit (I used it from dtsi > from xiaomi repository). > > > > I think this is with vsync problem. Your driver support DSI_VSYNC input? > In panel driver I sent command for vblank, on oscilloscope I saw pulse on > this pin 60Hz. I tried find path in your driver code, added some debug > output in code with sync. I saw MDSS_DSI_0_TRIG_CTRL configured with > support TE. But Its not helped for me. > > > > If you know something, tell me. Or how change driver to support > DSI_VSYNC input. > > > > I guess this is a command mode panel? So you'd be caring about the TE > signal? As far as I understand (from, iirc, jhugo) this was handled > by the hardware and not exposed to the driver on older devices. > > If it is a video mode panel, the problem could be different (userspace > not waiting for pageflip event?) > > BR, > -R >
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