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PCI: qcom: Make sure PCIe is reset before init for rev 2.1.0

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[ Upstream commit d3d4d028af ]

Qsdk U-Boot can incorrectly leave the PCIe interface in an undefined
state if bootm command is used instead of bootipq. This is caused by the
not deinit of PCIe when bootm is called. Reset the PCIe before init
anyway to fix this U-Boot bug.

Link: https://lore.kernel.org/r/20200901124955.137-1-ansuelsmth@gmail.com
Fixes: 82a823833f ("PCI: qcom: Add Qualcomm PCIe controller driver")
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ansuel Smith
2020-09-01 14:49:54 +02:00
committed by Greg Kroah-Hartman
parent 9dfbc2f82a
commit 504cfb5e3b
1 changed files with 13 additions and 0 deletions
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13
drivers/pci/controller/dwc/pcie-qcom.c
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@@ -303,6 +303,9 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
clk_disable_unprepare(res->core_clk);
clk_disable_unprepare(res->aux_clk);
clk_disable_unprepare(res->ref_clk);
writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL);
regulator_bulk_disable(ARRAY_SIZE(res->supplies), res->supplies);
}
@@ -315,6 +318,16 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
u32 val;
int ret;
/* reset the PCIe interface as uboot can leave it undefined state */
reset_control_assert(res->pci_reset);
reset_control_assert(res->axi_reset);
reset_control_assert(res->ahb_reset);
reset_control_assert(res->por_reset);
reset_control_assert(res->ext_reset);
reset_control_assert(res->phy_reset);
writel(1, pcie->parf + PCIE20_PARF_PHY_CTRL);
ret = regulator_bulk_enable(ARRAY_SIZE(res->supplies), res->supplies);
if (ret < 0) {
dev_err(dev, "cannot enable regulators\n");