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Date: Thu, 29 Feb 2024 21:11:36 -0800
From: Shashank Babu Chinta Venkata <quic_schintav@...cinc.com>
To: <agross@...nel.org>, <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <mani@...nel.org>
CC: <quic_msarkar@...cinc.com>, <quic_kraravin@...cinc.com>,
        Lorenzo Pieralisi
	<lpieralisi@...nel.org>,
        Krzysztof Wilczyński
	<kw@...ux.com>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas
	<bhelgaas@...gle.com>,
        Manivannan Sadhasivam
	<manivannan.sadhasivam@...aro.org>,
        Yoshihiro Shimoda
	<yoshihiro.shimoda.uh@...esas.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Josh Triplett
	<josh@...htriplett.org>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: [PATCH v1 3/3] PCI: dwc: add rx margining settings for gen4

Add rx margining settings for gen4 operation.

Signed-off-by: Shashank Babu Chinta Venkata <quic_schintav@...cinc.com>
---
 drivers/pci/controller/dwc/pcie-qcom-cmn.c | 36 ++++++++++++++++++++++
 drivers/pci/controller/dwc/pcie-qcom-cmn.h | 34 ++++++++++++++++++++
 drivers/pci/controller/dwc/pcie-qcom-ep.c  |  4 ++-
 drivers/pci/controller/dwc/pcie-qcom.c     |  4 ++-
 4 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom-cmn.c b/drivers/pci/controller/dwc/pcie-qcom-cmn.c
index cfdc04eef78c..abba4de32005 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-cmn.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-cmn.c
@@ -50,6 +50,42 @@ void qcom_pcie_cmn_set_gen4_eq_settings(struct dw_pcie *pci)
 }
 EXPORT_SYMBOL_GPL(qcom_pcie_cmn_set_gen4_eq_settings);
 
+void qcom_pcie_cmn_set_gen4_rx_margining_settings(struct dw_pcie *pci)
+{
+	u32 reg;
+
+	reg = dw_pcie_readl_dbi(pci, GEN4_LANE_MARGINING_1_OFF);
+	reg &= ~MARGINING_MAX_VOLTAGE_OFFSET_MASK;
+	reg |= (MARGINING_MAX_VOLTAGE_OFFSET_VAL <<
+		MARGINING_MAX_VOLTAGE_OFFSET_SHIFT);
+	reg &= ~MARGINING_NUM_VOLTAGE_STEPS_MASK;
+	reg |= (MARGINING_NUM_VOLTAGE_STEPS_VAL <<
+		MARGINING_NUM_VOLTAGE_STEPS_SHIFT);
+	reg &= ~MARGINING_MAX_TIMING_OFFSET_MASK;
+	reg |= (MARGINING_MAX_TIMING_OFFSET_VAL <<
+		MARGINING_MAX_TIMING_OFFSET_SHIFT);
+	reg &= ~MARGINING_NUM_TIMING_STEPS_MASK;
+	reg |= MARGINING_NUM_TIMING_STEPS_VAL;
+	dw_pcie_writel_dbi(pci, GEN4_LANE_MARGINING_1_OFF, reg);
+
+
+	reg = dw_pcie_readl_dbi(pci, GEN4_LANE_MARGINING_2_OFF);
+	reg |= MARGINING_IND_ERROR_SAMPLER;
+	reg |= MARGINING_SAMPLE_REPORTING_METHOD;
+	reg |= MARGINING_IND_LEFT_RIGHT_TIMING;
+	reg |= MARGINING_VOLTAGE_SUPPORTED;
+	reg &= ~MARGINING_IND_UP_DOWN_VOLTAGE;
+	reg &= ~MARGINING_MAXLANES_MASK;
+	reg |= (pci->num_lanes <<
+		MARGINING_MAXLANES_SHIFT);
+	reg &= ~MARGINING_SAMPLE_RATE_TIMING_MASK;
+	reg |= (MARGINING_SAMPLE_RATE_TIMING_VAL <<
+		MARGINING_SAMPLE_RATE_TIMING_SHIFT);
+	reg |= MARGINING_SAMPLE_RATE_VOLTAGE_VAL;
+	dw_pcie_writel_dbi(pci, GEN4_LANE_MARGINING_2_OFF, reg);
+}
+EXPORT_SYMBOL_GPL(qcom_pcie_cmn_set_gen4_rx_margining_settings);
+
 int qcom_pcie_cmn_icc_get_resource(struct dw_pcie *pci, struct icc_path *icc_mem)
 {
 	int ret = 0;
diff --git a/drivers/pci/controller/dwc/pcie-qcom-cmn.h b/drivers/pci/controller/dwc/pcie-qcom-cmn.h
index 08e1bd179207..b145743a7558 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-cmn.h
+++ b/drivers/pci/controller/dwc/pcie-qcom-cmn.h
@@ -27,11 +27,40 @@
 #define GEN3_EQ_FMDC_MAX_PRE_CUSROR_DELTA_SHIFT		10
 #define GEN3_EQ_FMDC_MAX_POST_CUSROR_DELTA_SHIFT	14
 
+#define GEN4_LANE_MARGINING_1_OFF		0xb80
+#define GEN4_LANE_MARGINING_2_OFF		0xb84
+
+#define MARGINING_MAX_VOLTAGE_OFFSET_MASK	GENMASK(29, 24)
+#define MARGINING_NUM_VOLTAGE_STEPS_MASK	GENMASK(22, 16)
+#define MARGINING_MAX_TIMING_OFFSET_MASK	GENMASK(13, 8)
+#define MARGINING_NUM_TIMING_STEPS_MASK		GENMASK(5, 0)
+#define MARGINING_MAX_VOLTAGE_OFFSET_SHIFT	24
+#define MARGINING_NUM_VOLTAGE_STEPS_SHIFT	16
+#define MARGINING_MAX_TIMING_OFFSET_SHIFT	8
+#define MARGINING_MAX_VOLTAGE_OFFSET_VAL	0x24
+#define MARGINING_NUM_VOLTAGE_STEPS_VAL		0x78
+#define MARGINING_MAX_TIMING_OFFSET_VAL		0x32
+#define MARGINING_NUM_TIMING_STEPS_VAL		0x10
+
+#define MARGINING_IND_ERROR_SAMPLER		BIT(28)
+#define MARGINING_SAMPLE_REPORTING_METHOD	BIT(27)
+#define MARGINING_IND_LEFT_RIGHT_TIMING		BIT(26)
+#define MARGINING_IND_UP_DOWN_VOLTAGE		BIT(25)
+#define MARGINING_VOLTAGE_SUPPORTED		BIT(24)
+#define MARGINING_MAXLANES_MASK			GENMASK(20, 16)
+#define MARGINING_SAMPLE_RATE_TIMING_MASK	GENMASK(13, 8)
+#define MARGINING_SAMPLE_RATE_VOLTAGE_MASK	GENMASK(5, 0)
+#define MARGINING_MAXLANES_SHIFT		16
+#define MARGINING_SAMPLE_RATE_TIMING_SHIFT	8
+#define MARGINING_SAMPLE_RATE_TIMING_VAL	0x3f
+#define MARGINING_SAMPLE_RATE_VOLTAGE_VAL	0x3f
+
 #ifdef CONFIG_PCIE_QCOM_CMN
 int qcom_pcie_cmn_icc_get_resource(struct dw_pcie *pci, struct icc_path *icc_mem);
 int qcom_pcie_cmn_icc_init(struct dw_pcie *pci, struct icc_path *icc_mem);
 void qcom_pcie_cmn_icc_update(struct dw_pcie *pci, struct icc_path *icc_mem);
 void qcom_pcie_cmn_set_gen4_eq_settings(struct dw_pcie *pci);
+void qcom_pcie_cmn_set_gen4_rx_margining_settings(struct dw_pcie *pci);
 #else
 static inline int qcom_pcie_cmn_icc_get_resource(struct dw_pcie *pci, struct icc_path *icc_mem)
 {
@@ -50,4 +79,9 @@ static inline void qcom_pcie_cmn_icc_update(struct dw_pcie *pci, struct icc_path
 static inline void qcom_pcie_cmn_set_gen4_eq_settings(struct dw_pcie *pci)
 {
 }
+
+static inline void qcom_pcie_cmn_set_gen4_rx_margining_settings(struct dw_pcie *pci)
+{
+}
+
 #endif
diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 0b169bcd081d..5422fa970d9d 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -439,8 +439,10 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
 	}
 
 	/* set Gen4 equalization settings */
-	if (pci->link_gen == 4)
+	if (pci->link_gen == 4) {
 		qcom_pcie_cmn_set_gen4_eq_settings(pci);
+		qcom_pcie_cmn_set_gen4_rx_margining_settings(pci);
+	}
 
 	/*
 	 * The physical address of the MMIO region which is exposed as the BAR
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index ad0cd55da777..3ada1e9fdd11 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -264,8 +264,10 @@ static int qcom_pcie_start_link(struct dw_pcie *pci)
 	struct qcom_pcie *pcie = to_qcom_pcie(pci);
 
 	/* set Gen4 equalization settings */
-	if (pci->link_gen == 4)
+	if (pci->link_gen == 4) {
 		qcom_pcie_cmn_set_gen4_eq_settings(pci);
+		qcom_pcie_cmn_set_gen4_rx_margining_settings(pci);
+	}
 
 	/* Enable Link Training state machine */
 	if (pcie->cfg->ops->ltssm_enable)
-- 
2.43.2

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