Hi Geert, On Fri, Jul 08, 2022 at 08:20:45PM +0200, Geert Uytterhoeven wrote: > Hi all, > > A long outstanding issue with the DRM subsystem has been the lack of > support for low-color displays, as used typically on older desktop > systems, and on small embedded displays. IT is super to have this addressed - thanks! > > This patch series adds support for color-indexed frame buffer formats > with 2, 4, and 16 colors. It has been tested on ARAnyM using a > work-in-progress Atari DRM driver supporting 2, 4, 16, 256, and 65536 > colors, with text console operation, fbtest, and modetest. > > Overview: > - Patch 1 introduces a helper, to be used by later patches in the > series, > - Patch 2 introduces a flag to indicate color-indexed formats, > - Patches 3 and 4 correct calculations of bits per pixel for sub-byte > pixel formats, > - Patches 5 and 6 introduce the new C[124] formats, > - Patch 7 fixes an untested code path, > - Patch 8 documents the use of "red" for light-on-dark displays, > - Patches 9 and 10 add more fourcc codes for light-on-dark and > dark-on-light frame buffer formats, which may be useful for e.g. the > ssd130x and repaper drivers. Applied all patches to drm-misc (drm-misc-next), including the last two RFC patches as we then have the formats ready when a user pops up. Sam
