Re: DRI R300 corrupted display purely DRI issue ? G5 AGP support

[Vladimir Dergachev]

On Sun, 26 Dec 2004, Jerome Glisse wrote:
Vladimir Dergachev wrote:
Hi Jerome,
  Keith has reported that specifying Option "XaaNoScanlineImageWriteRect"
stops the artifacts - does this work for you ? In any depth ?
Yes browsing the archive i saw that option, this correct the problem for 
almost all
application, in fact only xemacs still got corrupted font.

Anyway we shouldn't have to enable this option to prevent from a corrupted 
display,
there is a bug somewhere no ? In xaa ?
What this option does is tell us which function is the likely culprit.
Take a look at radeon_accelfuncs.c in
     xc/programs/Xserver/hw/xfree86/drivers/ati
Try to experiment with function RADEONSetupForScanlineImageWrite - there 
is a section inside that depends on endiannes.

Since the problem manifests only with DRM driver the issues must be in the
ACCEL_CP section.
For example try replacing
------------------------------------------------------------
    if (bpp == 16)
        OUT_ACCEL_REG(RADEON_RBBM_GUICNTL,   RADEON_HOST_DATA_SWAP_HDW);
    else
        OUT_ACCEL_REG(RADEON_RBBM_GUICNTL,   RADEON_HOST_DATA_SWAP_NONE);
------------------------------------------------------------
with the following code from MMIO section:
------------------------------------------------------------
    if (bpp == 16)
        OUT_ACCEL_REG(RADEON_RBBM_GUICNTL,   RADEON_HOST_DATA_SWAP_16BIT);
    else if (bpp == 32)
        OUT_ACCEL_REG(RADEON_RBBM_GUICNTL,   RADEON_HOST_DATA_SWAP_32BIT);
    else
        OUT_ACCEL_REG(RADEON_RBBM_GUICNTL,   RADEON_HOST_DATA_SWAP_NONE);
-------------------------------------------------------------
If this does not help, simply experiment providing different endianness
settings. Perhaps one of them will work.
                     thank you !
                         Vladimir Dergachev

best,
Jerome Glisse

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