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<wens>
a lot of reverts... # 19deb7695e07 Revert "Revert "Revert "mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask""
<megi>
:)
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<megi>
I tried to test HDMI audio on 5.4-rc1 on H5, and it's funny :) When I switch to HDMI audio output in pulseuadio, it will start playing at twice the speed compared to the internal codec output
<megi>
mpv seemingly speeds up its playback time output
<jernej>
not really, since it work for my use case
<jernej>
for out-of-tree ARM kernel driver
<megi>
they'll not with newer kernel versions
<megi>
because clocks were renamed
<megi>
ah
<megi>
ok
<megi>
I was testing with mesa
<jernej>
there is a long way for t720 on mesa
<megi>
probably
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<megi>
there's some creative use of A13 LCD interface on PocketBook e-book reader
<megi>
basically they have all signals except pixel clock wired to LCD data pins on the SoC
<megi>
and use it as a glorified DMA based bitbanging interface
<KotCzarny>
lol
<megi>
they load bit-banging pattern to ram and just shuffle it to LCD interface data pins as is
<megi>
really kind of pointless, because you can just as well bit-bang from CPU
<megi>
with the ammounts of bits you need to shuffle it doesn't take much time
<KotCzarny>
maybe it makes it easier to progrem that way
<megi>
I've seen the 6000 line driver
<megi>
no
<megi>
:D
<KotCzarny>
:)
<megi>
anyway, I'm really close :) I have everything reverse engineered, and it's just eInk driver and I'm done
<megi>
I'll have complete mainline linux support for everything in the e-reader
<megi>
it's kind of plug and play too, buy a broken e-reader for a few bucks on ebay + eink display on aliexpress, and the system can read waveforms from the flash chip that's soldered on the display's FFC cable
<megi>
and vcom voltage can be measured too
<KotCzarny>
yeah, plenty of those 'broken screen' stuff half free around
<megi>
yeah
<KotCzarny>
but why dont the displays on A13 read waveforms that way?
<KotCzarny>
and rely on os loading
<megi>
I don't know, but the BSP kernel also has a SPI driver enabled and configured
<megi>
so maybe they do
<megi>
and just read it from flash and store on the SD card
<megi>
for faster loading
<megi>
dunno
<megi>
there's some special calibration mini-rootfs with some tools to calibrate the touchpanel and the eink display, so maybe it's there
<megi>
and they just do it once in the factory
<KotCzarny>
want rootfs of my device for comparison?
<megi>
probly not :)
<KotCzarny>
;)
<KotCzarny>
i suspect there is few different designs
<megi>
i'm now just focused on figuring out the precise connections to the display
<megi>
yeah, certainly
<megi>
the display module on the one I have has fewer signal paths to the eink panel than the other more documented ones
<megi>
I know older revision of the touch lux has display without the flash, and with more control pins to the source/gate drivers
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<megi>
the display I have is also used on some kindles
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<KotCzarny>
pearl or carta?
<megi>
no idea, I just saw it mentioned as a replacement display for kidnles too
<KotCzarny>
pearl is the older/muddy one
<megi>
it's ed060xd4
<KotCzarny>
carta has higher contrast
<megi>
it's paperwhite
<megi>
I got lucky, I found's some guy on youtube disassembling some digma device with the same display, and after pulling the display cable there were nicely ordered test pads with signal names marked on them along the display connector :D that helped a bit
<Ixnus>
I'll verify and upload photos to the wiki.
<Ixnus>
Fsck, just remembered that I don't know what I actually bough 2 or 3 :)
<Ixnus>
I hope is "2" so we have both models.
<willmore>
megi, sounds like some of those USB<>display adapters. There's one cheap brand that basically just streams data from the USB3 through some DACs and out the pins on the HD15 connector. People have used them to broadcast radio signals. :)
<megi>
:D
<KotCzarny>
waveforms, all the way down
<KotCzarny>
;)
<KotCzarny>
i know, i know!
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<KotCzarny>
they are controlling us via them!
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<megi>
omg! I found the datasheet for my display :)
<megi>
it matches my reverse engineering perfectly, except for plenty of NC pins that are routed to SPI-NOR memory on my board
<KotCzarny>
:)
<megi>
Ixnus: I'll send it to you, as it's basically compatible with what you have
<megi>
my driver will most probably work for you too, without changes
<megi>
btw, pocketbook BSP writes this during powerdown: "Requesting powerdownses..." :)
<megi>
someone's a fan of Tolkien
<megi>
or it's chinglish
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