PCI: iproc: Fix PCIe reset logic

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The current reset logic does not always properly reset the device.  For
example, in the case when the perst_b signal is already de-asserted in the
bootloader, the current reset logic fails to trigger a proper assert ->
de-assert reset sequence.

Fix the issue by always triggering the proper reset sequence.

Also explicitly select the desired reset source, i.e., perst_b, and reduce
the wait time after the device comes out of reset from 250 ms to 100 ms,
based on recommendation from the ASIC team.

Tested-by: Vladimir Dreizin <vdreizin@broadcom.com>
Tested-by: Darren Edamura <dedamura@broadcom.com>
Signed-off-by: Ray Jui <rjui@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Vladimir Dreizin <vdreizin@broadcom.com>
Reviewed-by: Trac Hoang <trhoang@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>

...

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Ray Jui 2015-09-15 17:39:18 -07:00 • committed by Bjorn Helgaas

parent bdb8a1844f

commit 199ff14100

1 changed files with 10 additions and 5 deletions

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drivers/pci/host/pcie-iproc.c

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