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PCI: tegra264: Update EP state change handling

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When Thor EP is connected to Thor RP, PERST# signal don't get toggle
post Thor RP boot.
- When EP start is triggered, de-assert EP if RP PERST# is released.
- When EP stop is triggered, assert EP directly.

Bug 4567932

Change-Id: I86e9251205a7c19dd32789052a10669fc3b48098
Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-t264/+/3170657
Reviewed-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
This commit is contained in:
Nagarjuna Kristam
2024-07-08 21:49:50 +05:30
committed by Jon Hunter
parent 4ab2bfd19c
commit bb8ac1d6be
1 changed files with 13 additions and 2 deletions
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15
drivers/pci/controller/private-soc/pcie-tegra264-ep.c
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@@ -500,8 +500,15 @@ static int tegra264_pcie_ep_start(struct pci_epc *epc)
{
struct tegra264_pcie_ep *pcie = epc_get_drvdata(epc);
if (pcie->pex_prsnt_gpiod)
if (gpiod_get_value_cansleep(pcie->pex_rst_gpiod) == 0U) {
dev_dbg(pcie->dev, "RP already started. Starting EP\n");
tegra264_pcie_ep_rst_deassert(pcie);
}
if (pcie->pex_prsnt_gpiod) {
dev_dbg(pcie->dev, "De-Asserting PRSNT\n");
gpiod_set_value_cansleep(pcie->pex_prsnt_gpiod, 1);
}
return 0;
}
@@ -510,10 +517,14 @@ static void tegra264_pcie_ep_stop(struct pci_epc *epc)
{
struct tegra264_pcie_ep *pcie = epc_get_drvdata(epc);
if (pcie->pex_prsnt_gpiod)
if (pcie->pex_prsnt_gpiod) {
dev_dbg(pcie->dev, "Asserting PRSNT\n");
gpiod_set_value_cansleep(pcie->pex_prsnt_gpiod, 0);
}
tegra264_pcie_ep_rst_assert(pcie);
}
static const struct pci_epc_features tegra264_pcie_epc_features = {
.linkup_notifier = true,
.core_init_notifier = false,