Hello Geert, On 2/1/22 09:43, Geert Uytterhoeven wrote: > Hi Javier, > > On Mon, Jan 31, 2022 at 9:12 PM Javier Martinez Canillas > <javierm@xxxxxxxxxx> wrote: >> This patch series adds a DRM driver for the Solomon OLED SSD1305, SSD1306, >> SSD1307 and SSD1309 displays. It is a port of the ssd1307fb fbdev driver. > > Thanks for your series! > > I'll give it a try on an Adafruit FeatherWing 128x32 OLED, connected > to an OrangeCrab ECP5 FPGA board running a 64 MHz VexRiscv RISC-V > softcore. > Awesome! let me know if you have any issues. I keep an update-to-date version at https://github.com/martinezjavier/linux/tree/ssd1307 >> Using the DRM fb emulation, all the tests from Geert Uytterhoeven's fbtest >> (https://git.kernel.org/pub/scm/linux/kernel/git/geert/fbtest.git) passes: >> >> ./fbtest -f /dev/fb1 >> Using drawops cfb32 (32 bpp packed pixels) >> Available visuals: >> Monochrome >> Grayscale 256 >> Truecolor 8:8:8:0 > > Oh, fake 32-bpp truecolor ;-) > Yes :) that's what the repaper drivers does to have maximum compatibility with existing user-space and I followed the same. > Does it run modetest, too? > It does, yes. And for example `modetest -M ssd1307` will print all the info about encoders, connectors, CRTs, etc. > I'm trying to get modetest working on my atari DRM driver. > Comparing to the cirrus driver doesn't help much, as modetest doesn't > seem to work with the cirrus driver (modified to not do hardware > access, as I don't have cirrus hardware): > > # modetest -M cirrus -s 31:1024x768-60Hz > setting mode 1024x768-60.00Hz on connectors 31, crtc 34 > failed to set gamma: Function not implemented > # modetest -M ssd1307 -c -s 31:128x64-0.12Hz ... setting mode 128x64-0.12Hz on connectors 31, crtc 33 failed to set gamma: Function not implemented this seems to be a bug in modetest. I found a patch posted some time ago but never landed: https://www.spinics.net/lists/dri-devel/msg251356.html > Does there exist another simple test program for showing something > using the DRM API? > I tested with plymouth and gdm that make use of the DRM API, they do start and I see something on the screen but don't really handle that well the fact that's a 128x64 resolution. I didn't test with more DRM programs because was mostly interested in making sure that the fbdev emulation was working correctly. Noticed that Simon shared some simple examples, I'll give them a try. Best regards, -- Javier Martinez Canillas Linux Engineering Red Hat
