Corrupted display (radeon_accelfuncs.c)

[Jerome Glisse]

Vladimir Dergachev wrote:

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.
hhhmm
I experimented a bit but the problem is still around i am wondering
if the problem did not came from the planemask provided to
   RADEONSetupForScanlineImageWrite
Or the problem is in
   RADEONSubsequentScanlineImageWriteRect
This code (radon_accelfuncs.c) is an Xorg file or it came from DRI ?
I could only test on r300 maybe r200 on ppc did not have this bug.
Anyone can test ?
Maybe we should add a bug to Xorg bugzilla for that.
If anybody get idea on this.
best,
Jerome Glisse
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