diff options
| author | Bjorn Andersson <bjorn.andersson@linaro.org> | 2019-01-25 15:26:16 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 20:11:27 +0100 |
| commit | 63a9e7ce6624ef0385a1c65bdae0708d3abb7f47 (patch) | |
| tree | 40baef61a94c221536d7354cb18f2ecc54f20ba0 /drivers | |
| parent | eafa704de27bbb428f83d282aabcb5087256aa77 (diff) | |
PCI: qcom: Don't deassert reset GPIO during probe
commit 02b485e31d98265189b91f3e69c43df2ed50610c upstream.
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-qcom.c | 2 |
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; |