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From: Mathieu Malaterre <malat@debian.org>
To: linux-fbdev@vger.kernel.org
Subject: [powerpc] offb: red / blue color inversion
Date: Thu, 09 Jun 2016 12:25:51 +0000	[thread overview]
Message-ID: <CA+7wUsw+LHgCz6SDHxrbPiwrpN53WB7+KxaAgnVYdwrp4OyVQQ@mail.gmail.com> (raw)

Dear all,

I am trying to fix an issue with color inversion in the current offb.c
implementation. I am using a Mac Mini G4 (PPC) with:

[    0.844144] fb0: Open Firmware frame buffer device on
/pci@f0000000/ATY,RockHopper2Parent@10/ATY,RockHopper2_A@0

reported as [*]. I have tried looking at the upstream code source, and
it appears that my configuration falls into the 'cmap_simple'. But
other than that I failed to understand what could be wrong (palette
would be setup backward).

What are the low level tool (user-space) I can use to try to
understand what is wrong with offb on my machine without rebuilding
the kernel (CONFIG_FB_OF is not a module) ?

Thanks much,



[*] $ fbset -i

mode "800x600-186"
    # D: 100.000 MHz, H: 119.048 kHz, V: 186.012 Hz
    geometry 800 600 800 600 8
    timings 10000 16 16 16 16 8 8
    rgba 8/0,8/0,8/0,0/0
endmode

Frame buffer device information:
    Name        : OFfb ATY,RockHo
    Address     : 0x9c008000
    Size        : 614400
    Type        : PACKED PIXELS
    Visual      : PSEUDOCOLOR
    XPanStep    : 0
    YPanStep    : 0
    YWrapStep   : 0
    LineLength  : 1024
    Accelerator : No

             reply	other threads:[~2016-06-09 12:25 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-09 12:25 Mathieu Malaterre [this message]
2016-06-17  7:11 ` [powerpc] offb: red / blue color inversion Geert Uytterhoeven
2016-09-13 13:37 ` Mathieu Malaterre

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