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@redhat.com 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 8:8:8:0Oh, 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,