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* Revert "video: fbdev: mxsfb: Remove driver"
@ 2021-08-15 12:16 Alistair Francis
  2021-08-15 12:31 ` Marek Vasut
  0 siblings, 1 reply; 12+ messages in thread
From: Alistair Francis @ 2021-08-15 12:16 UTC (permalink / raw)
  To: Fabio Estevam, Shawn Guo, Sascha Hauer, dl-linux-imx,
	Marek Vasut, b.zolnierkie, Linux Kernel Mailing List,
	Alistair Francis


Commit f225f1393f034 "video: fbdev: mxsfb: Remove driver" removed the
mxsfb fbdev driver.

I am now working on getting mainline Linux running on the reMarkable 2
eInk reader [1]. Unfortunately the rM2 doesn't use the standard EPD
controller on the i.MX SoC, but instead uses the LCD controller.

eInk panels are complex to control and require writing temperature
dependent waveforms. As these waveforms are proprietary [2] the rM
team runs closed source software called SWTCON in userspace to control
the panel [3].

This closed source software expects the fbdev mxsfb driver and it
doesn't work with the DRM mxsfb driver (at least not that I can get it

The NXP fork of Linux also re-adds the fbdev driver [4], so they also
see some uses for it.

I was wondering if the community would be open to re-adding the fbdev
mxsfb driver to mainline? It could be re-added with a different
dt-binding so that it is not used by default and only enabled for
boards when required (like for the rM2).



^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2021-10-21 10:43 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-15 12:16 Revert "video: fbdev: mxsfb: Remove driver" Alistair Francis
2021-08-15 12:31 ` Marek Vasut
2021-08-16  7:34   ` Alistair Francis
2021-08-16  7:55     ` Marek Vasut
2021-08-17  9:08       ` Alistair Francis
2021-08-17 10:03         ` Marek Vasut
2021-08-17 12:16           ` Alistair Francis
     [not found]             ` <YR1R7/>
2021-08-19  8:16               ` Alistair Francis
     [not found]             ` <YR1Th65KKRS4D/>
2021-08-19  9:10               ` Alistair Francis
     [not found]                 ` <>
2021-08-19 22:36                   ` Alistair Francis
2021-10-14  9:56                     ` Alistair Francis
2021-10-21 10:42                       ` Alistair Francis

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