The power up defaults of the MPLL are designed for the standard 125MHz
refclock derived from the ENET PLL. As this clock has a jitter that
violates the PCIe Gen2 timing requirements, some board designs use
an external reference clock generator. Those clock generators may
output a clock at a different rate than what the MPLL expects
(usually a 100MHz clock, to re-use the PCIe bus clock).
In that case the MPLL must be reconfigured via overrides to use
different refclock dividers and loop multipliers. The i.MX6
reference manual lists both 100MHz and 200MHz as supported refclock
rates and the associated mult and div values.
Only the 100MHz setup has been tested on a real board, but since the
200MHz setup only differs in the used pre-divider it seems safe to
add it now.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
Function dw_pcie_host_init() already initializes the root_bus_nr field
of 'struct pcie_port', so the -1 assignment prior to calling
dw_pcie_host_init() in platform specific driver is not really needed.
Drop it.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Native PCI drivers for root complex devices were originally all in
drivers/pci/host/. Some of these devices can also be operated in endpoint
mode. Drivers for endpoint mode didn't seem to fit in the "host"
directory, so we put both the root complex and endpoint drivers in
per-device directories, e.g., drivers/pci/dwc/, drivers/pci/cadence/, etc.
These per-device directories contain trivial Kconfig and Makefiles and
clutter drivers/pci/. Make a new drivers/pci/controllers/ directory and
collect all the device-specific drivers there.
No functional change intended.
Link: https://lkml.kernel.org/r/1520304202-232891-1-git-send-email-shawn.lin@rock-chips.com
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
