linux-kernel - [PATCH 5.4 006/340] PCI: qcom: Use PHY_REFCLK_USE

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Date:   Mon,  1 Mar 2021 17:09:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ilia Mirkin <imirkin@...m.mit.edu>,
        Ansuel Smith <ansuelsmth@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Stanimir Varbanov <svarbanov@...sol.com>
Subject: [PATCH 5.4 006/340] PCI: qcom: Use PHY_REFCLK_USE_PAD only for ipq8064

From: Ansuel Smith <ansuelsmth@...il.com>

commit 2cfef1971aea6119ee27429181d6cb3383031ac2 upstream.

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: de3c4bf64897 ("PCI: qcom: Add support for tx term offset for rev 2.1.0")
Reported-by: Ilia Mirkin <imirkin@...m.mit.edu>
Signed-off-by: Ilia Mirkin <imirkin@...m.mit.edu>
Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Stanimir Varbanov <svarbanov@...sol.com>
Cc: stable@...r.kernel.org	# v4.19+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/controller/dwc/pcie-qcom.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -402,7 +402,9 @@ static int qcom_pcie_init_2_1_0(struct q
 
 	/* 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);