On 15/05/14 13:58, Mikulas Patocka wrote: > I had occasional screen corruption with the matrox framebuffer driver and > I found out that the reason for the corruption is that the hardware > blitter accesses the videoram while it is being written to. > > The matrox driver has a macro WaitTillIdle() that should wait until the > blitter is idle, but it sometimes doesn't work. I added a dummy read > mga_inl(M_STATUS) to WaitTillIdle() to fix the problem. The dummy read > will flush the write buffer in the PCI chipset, and the next read of > M_STATUS will return the hardware status. > > Since applying this patch, I had no screen corruption at all. > > Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx > Queued for 3.16. Tomi
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