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![]() PXA27x and later processors support overlay1 and overlay2 on-top of the base framebuffer (although under-neath the base is also possible). They support palette and no-palette RGB formats, as well as YUV formats (only available on overlay2). These overlays have dedicated DMA channels and behave in a similar way as a framebuffer. This heavily simplified and re-structured work is based on the original pxafb_overlay.c (which is pending for mainline merge for a long time). The major problems with this pxafb_overlay.c are (if you are interested in the history): 1. heavily redundant (the control logics for overlay1 and overlay2 are actually identical except for some small operations, which are now abstracted into a 'pxafb_layer_ops' structure) 2. a lot of useless and un-tested code (two workarounds which are now fixed on mature silicons) 3. cursorfb is actually useless, hardware cursor should not be used this way, and the code was actually un-tested for a long time. The code in this patch should be self-explanatory, I tried to add minimum comments. As said, this is basically simplified, there are several things still on the pending list: 1. palette mode is un-supported and un-tested (although re-using the palette code of the base framebuffer is actually very easy now with previous clean-up patches) 2. fb_pan_display for overlay(s) is un-supported 3. the base framebuffer can actually be abstracted by 'pxafb_layer' as well, which will help further re-use of the code and keep a better and consistent structure. (This is the reason I named it 'pxafb_layer' instead of 'pxafb_overlay' or something alike) See Documentation/fb/pxafb.txt for additional usage information. Signed-off-by: Eric Miao <eric.miao@marvell.com> Cc: Rodolfo Giometti <giometti@linux.it> Signed-off-by: Eric Miao <ycmiao@ycmiao-hp520.(none)> |
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.. | ||
cyblafb | ||
00-INDEX | ||
arkfb.txt | ||
aty128fb.txt | ||
cirrusfb.txt | ||
cmap_xfbdev.txt | ||
deferred_io.txt | ||
fbcon.txt | ||
framebuffer.txt | ||
gxfb.txt | ||
imacfb.txt | ||
intel810.txt | ||
intelfb.txt | ||
internals.txt | ||
lxfb.txt | ||
matroxfb.txt | ||
metronomefb.txt | ||
modedb.txt | ||
pvr2fb.txt | ||
pxafb.txt | ||
s3fb.txt | ||
sa1100fb.txt | ||
sh7760fb.txt | ||
sisfb.txt | ||
sstfb.txt | ||
tgafb.txt | ||
tridentfb.txt | ||
uvesafb.txt | ||
vesafb.txt | ||
viafb.modes | ||
viafb.txt | ||
vt8623fb.txt |