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Commit 9024143e authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Bjorn Helgaas
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PCI: dwc: Fix scheduling while atomic issues



When programming the inbound/outbound ATUs, we call usleep_range() after
each checking PCIE_ATU_ENABLE bit. Unfortunately, the ATU programming
can be executed in atomic context:

inbound ATU programming could be called through
pci_epc_write_header()
  =>dw_pcie_ep_write_header()
    =>dw_pcie_prog_inbound_atu()

outbound ATU programming could be called through
pci_bus_read_config_dword()
  =>dw_pcie_rd_conf()
    =>dw_pcie_prog_outbound_atu()

Fix this issue by calling mdelay() instead.

Fixes: f8aed6ec ("PCI: dwc: designware: Add EP mode support")
Fixes: d8bbeb39 ("PCI: designware: Wait for iATU enable")
Signed-off-by: default avatarJisheng Zhang <Jisheng.Zhang@synaptics.com>
[lorenzo.pieralisi@arm.com: commit log update]
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarGustavo Pimentel <gustavo.pimentel@synopsys.com>
parent b3027b77
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