Re: fbcon gives mirrored fonts on monochrome display

Den 22.01.2015 21:42, skrev Geert Uytterhoeven:

Hi Noralf,

On Thu, Jan 22, 2015 at 9:38 PM, Noralf Trønnes [off-list ref] wrote:

quoted

Den 22.01.2015 20:59, skrev Geert Uytterhoeven:

quoted

On Thu, Jan 22, 2015 at 8:55 PM, Noralf Trønnes [off-list ref] wrote:

quoted

Den 22.01.2015 20:44, skrev Geert Uytterhoeven:

quoted

On Thu, Jan 22, 2015 at 7:47 PM, Noralf Trønnes [off-list ref]
wrote:

quoted

I'm playing with a SSD1306 128x64 monochrome display and fbcon gives me
mirrored fonts and some extra lines.

$ zgrep CONFIG_FB_CFB_REV_PIXELS_IN_BYTE /proc/config.gz
# CONFIG_FB_CFB_REV_PIXELS_IN_BYTE is not set

quoted

Does your driver set FB_NONSTD_REV_PIX_IN_B?

No it doesn't. I also tried setting it now, with no effect:
info->var.nonstd = FB_NONSTD_REV_PIX_IN_B;

The latter only seems to matter if CONFIG_FB_CFB_REV_PIXELS_IN_BYTE
is set, so please try the config option first.

$ zgrep CONFIG_FB_CFB_REV_PIXELS_IN_BYTE /proc/config.gz
CONFIG_FB_CFB_REV_PIXELS_IN_BYTE=y

$ dmesg
[  365.595787]   nonstd = 2

It didn't change anything.

I looked up the code that is affected by this change, and only the cbf*.c
files use the rev/swap/shift functions from fb_draw.h
I use the sys_* modules not cbf*

One more thing that's no longer in sync...
Ideally, the cfb* and sys* versions are identical, except that the former
operates on MMIO, and the latter on RAM.

Ok, so I'm out of luck, unless I patch this up myself :-) (which didn't 
look very complicated btw, as you say they look very similar)

Thanks for your help.


Noralf.