JIRA: https://issues.redhat.com/browse/RHEL-83611
Upstream Status: 90d4e466c9ea2010f33880a36317a8486ccbe082

commit 90d4e466c9ea2010f33880a36317a8486ccbe082
Author: Lorenzo Bianconi <lorenzo@kernel.org>
Date:   Wed Jan 8 10:50:43 2025 +0100

    PCI: mediatek-gen3: Move reset delay in mtk_pcie_en7581_power_up()

    Airoha EN7581 has a hw bug asserting/releasing PCIE_PE_RSTB signal
    causing occasional PCIe link down issues. In order to overcome the
    problem, PCIe block is reset using REG_PCI_CONTROL (0x88) and
    REG_RESET_CONTROL (0x834) registers available in the clock module
    running clk_bulk_prepare_enable() in mtk_pcie_en7581_power_up().

    In order to make the code more readable, move the wait for the time
    needed to complete the PCIe reset from en7581_pci_enable() to
    mtk_pcie_en7581_power_up().

    Reduce reset timeout from 250ms to the standard PCIE_T_PVPERL_MS value
    (100ms) since it has no impact on the driver behavior.

    Link: https://lore.kernel.org/r/20250108-pcie-en7581-fixes-v6-4-21ac939a3b9b@kernel.org


Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>

Signed-off-by: Myron Stowe <mstowe@redhat.com>