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PCI: qcom: Use PHY_REFCLK_USE_PAD only for ipq8064

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The use of PHY_REFCLK_USE_PAD introduced a regression for apq8064 devices.
It was tested that while apq doesn't require the padding, ipq SoC must use
it or the kernel hangs on boot.

Link: https://lore.kernel.org/r/20201019165555.8269-1-ansuelsmth@gmail.com
Fixes: de3c4bf648 ("PCI: qcom: Add support for tx term offset for rev 2.1.0")
Reported-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: stable@vger.kernel.org	# v4.19+
This commit is contained in:
Ansuel Smith 2020-10-19 18:55:55 +02:00 committed by Bjorn Helgaas
parent 7081556f81
commit 2cfef1971a
1 changed files with 3 additions and 1 deletions
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4
drivers/pci/controller/dwc/pcie-qcom.c
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@ -400,7 +400,9 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
/* enable external reference clock */
val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
val &= ~PHY_REFCLK_USE_PAD;
/* USE_PAD is required only for ipq806x */
if (!of_device_is_compatible(node, "qcom,pcie-apq8064"))
val &= ~PHY_REFCLK_USE_PAD;
val |= PHY_REFCLK_SSP_EN;
writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);