When EP boot up first and RP in power OFF state, default PERST# input is
high due to onboard pull up. When RP is powered ON, it causes a glitch
from high to low due to default pinctl settings, it is perceived as
PERST# assert by Endpoint. In tegra264_pcie_ep_rst_assert() PRNST#
signal is released (set high), this will cause PCIe link up failure.
This WAR is initially added for RP reboot case, to handle a scenario
where EP function driver still executing core_deinit as part of PERST#
assert and mean while RP boot up and ready for link up again. However
on Thor it is measured that core_deinit is taking only ~1.4 msec which
completes before RP boots. So, it is safe to remove PRNST# release WAR
in tegra264_pcie_ep_rst_assert(), this fixes link up failure when RP
boot after EP.
Bug 4981895
Change-Id: Ie24652a267bf3e3bc740d9c40e5b6d6671429b00
Signed-off-by: Srishti Goel <srgoel@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3345684
(cherry picked from commit 8944b4a4d767a144b7204865d26b4e989ee003b6)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3338072
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Enabled RST# IRQ during EP_START after tegra264_pcie_ep_rst_deassert is
invoked for EP and disable RST# IRQ during EP_STOP after
tegra264_pcie_ep_rst_assert is executed for EP and EP is not available
anymore. This prevents unwanted EP accesses during RP reset sequence
causing PERST# to toggle, while EP is not ready or available.
Bug 5281037
Change-Id: I43e1fd6c6ccfaae64a6bb2375a3685f186766d78
Signed-off-by: Prakhar Srivastava <prasrivastav@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3363313
Reviewed-by: svcacv <svcacv@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Nagarjuna Kristam <nkristam@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
