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author | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2019-07-29 08:51:48 -0700 |
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committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2019-07-29 08:51:48 -0700 |
commit | ed32f8d42cee118b075e4372a55c7739a11094b2 (patch) | |
tree | 5a806c5168d4177e0536b98b6bda30ec4bdbac43 /Documentation/fb/metronomefb.rst | |
parent | drm/i915: Flush the i915_vm_release before ggtt shutdown (diff) | |
parent | Linus 5.3-rc1 (diff) | |
download | linux-ed32f8d42cee118b075e4372a55c7739a11094b2.tar.gz linux-ed32f8d42cee118b075e4372a55c7739a11094b2.tar.bz2 linux-ed32f8d42cee118b075e4372a55c7739a11094b2.zip |
Merge drm/drm-next into drm-intel-next-queued
Catching up with 5.3-rc*
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'Documentation/fb/metronomefb.rst')
-rw-r--r-- | Documentation/fb/metronomefb.rst | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/fb/metronomefb.rst b/Documentation/fb/metronomefb.rst new file mode 100644 index 000000000000..63e1d31a7e54 --- /dev/null +++ b/Documentation/fb/metronomefb.rst @@ -0,0 +1,38 @@ +=========== +Metronomefb +=========== + +Maintained by Jaya Kumar <jayakumar.lkml.gmail.com> + +Last revised: Mar 10, 2008 + +Metronomefb is a driver for the Metronome display controller. The controller +is from E-Ink Corporation. It is intended to be used to drive the E-Ink +Vizplex display media. E-Ink hosts some details of this controller and the +display media here http://www.e-ink.com/products/matrix/metronome.html . + +Metronome is interfaced to the host CPU through the AMLCD interface. The +host CPU generates the control information and the image in a framebuffer +which is then delivered to the AMLCD interface by a host specific method. +The display and error status are each pulled through individual GPIOs. + +Metronomefb is platform independent and depends on a board specific driver +to do all physical IO work. Currently, an example is implemented for the +PXA board used in the AM-200 EPD devkit. This example is am200epd.c + +Metronomefb requires waveform information which is delivered via the AMLCD +interface to the metronome controller. The waveform information is expected to +be delivered from userspace via the firmware class interface. The waveform file +can be compressed as long as your udev or hotplug script is aware of the need +to uncompress it before delivering it. metronomefb will ask for metronome.wbf +which would typically go into /lib/firmware/metronome.wbf depending on your +udev/hotplug setup. I have only tested with a single waveform file which was +originally labeled 23P01201_60_WT0107_MTC. I do not know what it stands for. +Caution should be exercised when manipulating the waveform as there may be +a possibility that it could have some permanent effects on the display media. +I neither have access to nor know exactly what the waveform does in terms of +the physical media. + +Metronomefb uses the deferred IO interface so that it can provide a memory +mappable frame buffer. It has been tested with tinyx (Xfbdev). It is known +to work at this time with xeyes, xclock, xloadimage, xpdf. |