On 08/09/2017 08:53 AM, Marcel Ziswiler wrote:
Hi Stephen

On Tue, 2017-08-08 at 10:14 -0600, Stephen Warren wrote:
On 08/08/2017 06:43 AM, Marcel Ziswiler wrote:
From: Marcel Ziswiler <marcel.ziswi...@toradex.com>

Allow optionally bringing up the Apalis type specific 4 lane PCIe port
as well as the PCIe switch as found on the Apalis Evaluation board. In
order to avoid violating the PCIe reset timing do this by overriding the
tegra_pcie_board_port_reset() function. Note however that both the
Apalis type specific 4 lane PCIe port as well as the regular Apalis PCIe
port are also left disabled in the device tree by default.
...
Also, how do
you know that the user isn't going to initialize PCIe multiple times and
expect the HW to get reset when they do?

Good question. However after having it implemented as requested below
keeping status and such it turns out there is no easy way to ever re-
initialise at least not with nowadays driver model in place (e.g. see
DM_FLAG_ACTIVATED in device_probe() of drivers/core/device.c). Or did I
miss anything?

I was naively assuming that "pci enum" would reset everything prior to re-enumeration. Perhaps it doesn't though; I didn't check the code.
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