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https://bugs.freedesktop.org/show_bug.cgi?id=3259
------- Additional Comments From [EMAIL PROTECTED] 2005-06-09 15:05 -------
Created an attachment (id=2859)
--> (https://bugs.freedesktop.org/attachment.cgi?id=2859&action=view)
Adds support for PCI cards to MGA DRM
This patch adds serveral new ioctls and a new query to get_param query to
support PCI MGA cards.
Two ioctls were added to implement interrupt based waiting. With this change,
the client-side driver no longer needs to map the primary DMA region or the
MMIO region. Previously, end-of-frame waiting was done by busy waiting in the
client-side driver until one of the MMIO registers (the current DMA pointer)
matched a pointer to the end of primary DMA space. By using interrupts, the
busy waiting and the extra mappings are removed.
A third ioctl was added to bootstrap DMA. This ioctl, which is used by the
X-server, moves a *LOT* of code from the X-server into the kernel. This allows
the kernel to do whatever needs to be done to setup DMA buffers. The entire
process and the locations of the buffers are hidden from user-mode.
Additionally, a get_param query was added to differentiate between G4x0 cards
and G550 cards. According to Ville Syrjälä, the G4x0 cards and the G550 cards
handle anisotropic filtering differently. This seems the most compatible way
to let the client-side driver know which card it's own. Doing this very small
change now eliminates the need to bump the DRM minor version twice.
http://marc.theaimsgroup.com/?l=dri-devel&m=106625815319773&w=2
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