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authorBjorn Andersson <bjorn.andersson@linaro.org>2019-01-26 00:26:16 +0100
committerLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2019-02-28 10:46:10 +0100
commit02b485e31d98265189b91f3e69c43df2ed50610c (patch)
treed6fea4f3bf478a724a28435ea14679e5d47e93e6 /drivers/pci
parentPCI: imx: Add workaround for e10728, IMX7d PCIe PLL failure (diff)
downloadlinux-02b485e31d98265189b91f3e69c43df2ed50610c.tar.xz
linux-02b485e31d98265189b91f3e69c43df2ed50610c.zip
PCI: qcom: Don't deassert reset GPIO during probe
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
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/controller/dwc/pcie-qcom.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index d185ea5fe996..a7f703556790 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1228,7 +1228,7 @@ 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;