[Bug 1257612]

[Michel-daenzer]

This is really weird: As you can see, tile_split is not 0, so the
division by 0 must be about stencil_tile_split. But I don't see how
eg_surface_best can not set stencil_tile_split to non-0 for a
depth/stencil surface...

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Title:
  divide by zero error in radeon_surface.c when opening chrome with
  WebGL enabled

Status in Accelerated Xorg driver for nVidia cards:
  Confirmed
Status in “libdrm” package in Ubuntu:
  New

Bug description:
  Passing a tile_split of zero to eg_surface_init_2d causes a divide by
  zero error. Launching chromium with WebGL enabled on a AMD Llano
  (A8-3850) exhibits this behavior and webgl then fails to work. The
  attached patch fixes the problem and allows WebGL to work in chrome on
  this platform.

  Additional information:

  lsb_release -rd
  Description:	Ubuntu 13.10
  Release:	13.10

  Package version: 
  libdrm_2.4.46-1ubuntu1

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