ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<milkylainen>
I have a 5.4.latest that refuses to start from a 2022.02 barebox when the secure_state isn't in secure svc. hyp or nonsecure svc mode (I assume?) yields nothing. Did I forget something? Cortex A7, imx6ul.
<milkylainen>
It starts in normal secure svc mode.
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<javierm>
geertu: finally had time to go through your low color format series. Awesome stuff
<geertu>
javierm: thanks for reviewing!
<geertu>
javierm: BTW, getting closer with the ssd130x issues...
<javierm>
geertu: you are welcome, and thanks for testing the driver and finding these issues
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<geertu>
javierm: nothing is drawn if rect.y1 != 0, that's why only the first line of text printed is shown
<geertu>
If I override rect.y1 to zero in ssd130x_fb_blit_rect(), everything is drawn correctly.
<javierm>
geertu: hmm, wonder if the bug is in ssd130x_update_rect()
<javierm>
geertu: but that explains why it was working for me with your fb tests, since they do a full screen update
<geertu>
javierm: Found it. And there's a similar bug for rect.x1 != 0.
<javierm>
geertu: ah! I'm curious now
<geertu>
javierm: buf in ssd130x_update_rect() is not relative to (x1, y1), but to (0, 0), hence the i/j loops reads from the wrong part of the buffer.
<geertu>
is relative to (x1, y1), not (0, 0)
<javierm>
geertu: oh, the same bug then would be present in the old ssd1307fb driver since I notice that do the same calculation to read the buffer
<javierm>
geertu: if you get to the end of it feel free to post a fix. Otherwise I could try to look at it tomorrow
<javierm>
geertu: and thanks again for tracking down that bug
<geertu>
javierm: I'll post a fix.
<geertu>
The old fbdev driver doesn't suffer from that issue, as the buffer is the full shadow frame buffer.
<javierm>
geertu: ah, right
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<javierm>
geertu: surprised how popular the driver is with many people testing and sending fixes
<javierm>
geertu: I thought was for a very obscure chip but it seems that is present in many small panels out there
<geertu>
javierm: one more correction: is relative to (x1 - x1 % 8, y1), not (0, 0)
<javierm>
geertu: I see
<geertu>
javierm: It's for one of the most popular chips for driving small OLEDs
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<javierm>
geertu: yep, noticed now. I just bought a panel with that chip and attempted to port the driver because Andy pointed to that one
<javierm>
I'll look if can buy one with a SPI interface to finish that RFC patch that posted in an early revision
<javierm>
that will need some DT binding changes though
<geertu>
javierm: Doh, there's another bug. If x1 is not a multiple of 8, it ends up in an infinite loop.
<javierm>
geertu: sigh, so many bugs :/
<geertu>
javierm: I didn't dare to try a 7x14 font, as I would probably run into the bug Marek reported
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<javierm>
geertu: yeah. I think that did try with that font before Thomas' patch landed and it was working. Becuase was one of the smallest I found IIRC
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