From: Ansuel Smith <ansuelsmth@gmail.com>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Ansuel Smith <ansuelsmth@gmail.com>,
stable@vger.kernel.org, Andy Gross <agross@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Stanimir Varbanov <svarbanov@mm-sol.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Andrew Murray <amurray@thegoodpenguin.co.uk>,
Philipp Zabel <p.zabel@pengutronix.de>,
linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v4 07/10] PCI: qcom: Define some PARF params needed for ipq8064 SoC
Date: Thu, 14 May 2020 22:07:08 +0200 [thread overview]
Message-ID: <20200514200712.12232-8-ansuelsmth@gmail.com> (raw)
In-Reply-To: <20200514200712.12232-1-ansuelsmth@gmail.com>
Set some specific value for Tx De-Emphasis, Tx Swing and Rx equalization
needed on some ipq8064 based device (Netgear R7800 for example). Without
this the system locks on kernel load.
Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver")
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Cc: stable@vger.kernel.org # v4.5+
---
drivers/pci/controller/dwc/pcie-qcom.c | 27 ++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index f2ea1ab6f584..f5398b0d270c 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -46,6 +46,9 @@
#define PCIE20_PARF_PHY_CTRL 0x40
#define PCIE20_PARF_PHY_REFCLK 0x4C
+#define PHY_REFCLK_SSP_EN BIT(16)
+#define PHY_REFCLK_USE_PAD BIT(12)
+
#define PCIE20_PARF_DBI_BASE_ADDR 0x168
#define PCIE20_PARF_SLV_ADDR_SPACE_SIZE 0x16C
#define PCIE20_PARF_MHI_CLOCK_RESET_CTRL 0x174
@@ -77,6 +80,18 @@
#define DBI_RO_WR_EN 1
#define PERST_DELAY_US 1000
+/* PARF registers */
+#define PCIE20_PARF_PCS_DEEMPH 0x34
+#define PCS_DEEMPH_TX_DEEMPH_GEN1(x) ((x) << 16)
+#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x) ((x) << 8)
+#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x) ((x) << 0)
+
+#define PCIE20_PARF_PCS_SWING 0x38
+#define PCS_SWING_TX_SWING_FULL(x) ((x) << 8)
+#define PCS_SWING_TX_SWING_LOW(x) ((x) << 0)
+
+#define PCIE20_PARF_CONFIG_BITS 0x50
+#define PHY_RX0_EQ(x) ((x) << 24)
#define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358
#define SLV_ADDR_SPACE_SZ 0x10000000
@@ -293,6 +308,7 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0;
struct dw_pcie *pci = pcie->pci;
struct device *dev = pci->dev;
+ struct device_node *node = dev->of_node;
u32 val;
int ret;
@@ -347,6 +363,17 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
val &= ~BIT(0);
writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+ if (of_device_is_compatible(node, "qcom,pcie-ipq8064")) {
+ writel(PCS_DEEMPH_TX_DEEMPH_GEN1(24) |
+ PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(24) |
+ PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(34),
+ pcie->parf + PCIE20_PARF_PCS_DEEMPH);
+ writel(PCS_SWING_TX_SWING_FULL(120) |
+ PCS_SWING_TX_SWING_LOW(120),
+ pcie->parf + PCIE20_PARF_PCS_SWING);
+ writel(PHY_RX0_EQ(4), pcie->parf + PCIE20_PARF_CONFIG_BITS);
+ }
+
/* enable external reference clock */
val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
val |= BIT(16);
--
2.25.1
next prev parent reply other threads:[~2020-05-14 20:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-14 20:07 [PATCH v4 00/10] Multiple fixes in PCIe qcom driver Ansuel Smith
2020-05-14 20:07 ` [PATCH v4 01/10] PCI: qcom: Add missing ipq806x clocks in PCIe driver Ansuel Smith
2020-06-01 20:56 ` Rob Herring
2020-05-14 20:07 ` [PATCH v4 02/10] dt-bindings: PCI: qcom: Add missing clks Ansuel Smith
2020-05-14 20:07 ` [PATCH v4 03/10] PCI: qcom: Change duplicate PCI reset to phy reset Ansuel Smith
2020-05-14 20:07 ` [PATCH v4 04/10] PCI: qcom: Add missing reset for ipq806x Ansuel Smith
2020-05-14 20:07 ` [PATCH v4 05/10] dt-bindings: PCI: qcom: Add ext reset Ansuel Smith
2020-05-14 20:07 ` [PATCH v4 06/10] PCI: qcom: Use bulk clk api and assert on error Ansuel Smith
2020-06-01 21:02 ` Rob Herring
2020-05-14 20:07 ` Ansuel Smith [this message]
2020-06-01 21:04 ` [PATCH v4 07/10] PCI: qcom: Define some PARF params needed for ipq8064 SoC Rob Herring
2020-05-14 20:07 ` [PATCH v4 08/10] PCI: qcom: Add ipq8064 rev2 variant and set tx term offset Ansuel Smith
2020-06-01 21:08 ` Rob Herring
2020-06-02 9:34 ` R: " ansuelsmth
2020-06-02 7:53 ` Stanimir Varbanov
2020-06-02 9:31 ` R: " ansuelsmth
2020-05-14 20:07 ` [PATCH v4 09/10] dt-bindings: PCI: qcom: Add ipq8064 rev 2 variant Ansuel Smith
2020-05-14 20:07 ` [PATCH v4 10/10] PCI: qcom: Add Force GEN1 support Ansuel Smith
2020-06-01 21:10 ` Rob Herring
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