There is no dedicated reset signal wired up for the MX6QDL thus if the
bootloader enables the link we need some special handling to get the core
back into a state where it is safe to touch it for configuration.
While there has been some special handling in the Linux kernel to do this,
it was removed in 4.11 thus we need to do it properly in the bootloader
and therefore without this if you enable PCI in the bootloader you will hang
while booting the 4.11 kernel.
This puts the PCIe controller back into a safe state for the kernel driver
before launching the kernel.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Tested-by: Peter Senna Tschudin <peter.senna@collabora.com>
When trying to access non-existent/unsupported PCI devices in
imx_pcie_read_config(), when imx_pcie_addr_valid() fails it returns
error code and fills in the result with 0xffffffff manually. But it
really should return zero to upper layer codes.
Reported-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Fabio Estevam <fabio.estevam@nxp.com>
PCI driver currently hangs on mx6qp.
Toggle the reset bit with the appropriate timings to fix the issue.
Based on the FSL kernel driver implementation.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Stefano Babic <sbabic@denx.de>
According to the IMX6 reference manuals, REF_SSP_EN (Reference clock enable
for SS function) must remain deasserted until the reference clock is running
at the appropriate frequency.
Without this patch we find a high link failure rate (>5%) on certain
IMX6 boards at various temperatures.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Acked-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
Implement a callback to toggle the slot power supply. The callback
can be overriden in case some more complex power supply for the slot
was implemented in hardware, yet for the usual case, one can define
a GPIO which toggles the power to the slot.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Liu Ying <Ying.Liu@freescale.com>
Add a callback so that a board can implement it's own specific routine to
toggle the port's #PERST line or #define a GPIO to do so.
Signed-off-by: Marek Vasut <marex@denx.de>
