[PATCHv5 0/2] Speed Cap fixes for ppc64

[Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>]

This v5 of the patch series is based on v4 sent by Lucas Kannebley Tavares
with a few changes:

  1. Fix a compilation warning on the code from the first patch, where it was
missing a declaration of struct pci_host_bridge, used on the definition of
the function pointer pcibios_root_bridge_prepare() in
arch/powerpc/include/asm/machdep.h.
  2. Incorporate some changes proposed by Tony Breeds in
pseries_root_bridge_prepare().

The following description of the changes was extrated from v4:

This patch series does:
  1. max_bus_speed is used to set the device to gen2 speeds
  2. on power there's no longer a conflict between the pseries call and other
architectures, because the overwrite is done via a ppc_md hook
  3. radeon is using bus->max_bus_speed instead of drm_pcie_get_speed_cap_mask
for gen2 capability detection

The first patch consists of some architecture changes, such as adding a hook on
powerpc for pci_root_bridge_prepare, so that pseries will initialize it to a
function, while all other architectures get a NULL pointer. So that whenever
pci_create_root_bus is called, we'll get max_bus_speed properly setup from
OpenFirmware.

The second patch consists of simple radeon changes not to call
drm_get_pcie_speed_cap_mask anymore. I assume that on x86 machines,
the max_bus_speed property will be properly set already.

Kleber Sacilotto de Souza (2):
  ppc64: perform proper max_bus_speed detection
  radeon: use max_bus_speed to activate gen2 speeds

 arch/powerpc/include/asm/machdep.h       |    3 ++
 arch/powerpc/kernel/pci-common.c         |    8 ++++
 arch/powerpc/platforms/pseries/pci.c     |   53 ++++++++++++++++++++++++++++++
 arch/powerpc/platforms/pseries/pseries.h |    4 ++
 arch/powerpc/platforms/pseries/setup.c   |    2 +
 drivers/gpu/drm/radeon/evergreen.c       |   10 ++----
 drivers/gpu/drm/radeon/r600.c            |    9 +----
 drivers/gpu/drm/radeon/rv770.c           |    9 +----
 8 files changed, 77 insertions(+), 21 deletions(-)