| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 082/167] PCI: qcom: Don't deassert reset GPIO during probe | Date | Tue, 3 Sep 2019 12:23:54 -0400 |
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From: Bjorn Andersson <bjorn.andersson@linaro.org>
[ Upstream commit 02b485e31d98265189b91f3e69c43df2ed50610c ]
Acquiring the reset GPIO low means that reset is being deasserted, this is followed almost immediately with qcom_pcie_host_init() asserting it, initializing it and then finally deasserting it again, for the link to come up.
Some PCIe devices requires a minimum time between the initial deassert and subsequent reset cycles. In a platform that boots with the reset GPIO asserted this requirement is being violated by this deassert/assert pulse.
Acquire the reset GPIO high to prevent this situation by matching the state to the subsequent asserted state.
Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver") Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> [lorenzo.pieralisi@arm.com: updated commit log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com> Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/pci/controller/dwc/pcie-qcom.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 79f06c76ae071..e292801fff7fd 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -1230,7 +1230,7 @@ static int qcom_pcie_probe(struct platform_device *pdev) pcie->ops = of_device_get_match_data(dev); - pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_LOW); + pcie->reset = devm_gpiod_get_optional(dev, "perst", GPIOD_OUT_HIGH); if (IS_ERR(pcie->reset)) { ret = PTR_ERR(pcie->reset); goto err_pm_runtime_put; -- 2.20.1
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