[PATCH v5 04/11] PCI: qcom: Add missing reset for ipq806x

[PATCH v5 04/11] PCI: qcom: Add missing reset for ipq806x

[Ansuel Smith]

Add missing ext reset used by ipq8064 SoC in PCIe qcom driver.

Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver")
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Cc: stable@vger.kernel.org # v4.5+
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 4512c2c5f61c..4dab5ef630cc 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -95,6 +95,7 @@ struct qcom_pcie_resources_2_1_0 {
 	struct reset_control *ahb_reset;
 	struct reset_control *por_reset;
 	struct reset_control *phy_reset;
+	struct reset_control *ext_reset;
 	struct regulator_bulk_data supplies[QCOM_PCIE_2_1_0_MAX_SUPPLY];
 };
 
@@ -272,6 +273,10 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
 	if (IS_ERR(res->por_reset))
 		return PTR_ERR(res->por_reset);
 
+	res->ext_reset = devm_reset_control_get_optional_exclusive(dev, "ext");
+	if (IS_ERR(res->ext_reset))
+		return PTR_ERR(res->ext_reset);
+
 	res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
 	return PTR_ERR_OR_ZERO(res->phy_reset);
 }
@@ -285,6 +290,7 @@ static void qcom_pcie_deinit_2_1_0(struct qcom_pcie *pcie)
 	reset_control_assert(res->axi_reset);
 	reset_control_assert(res->ahb_reset);
 	reset_control_assert(res->por_reset);
+	reset_control_assert(res->ext_reset);
 	reset_control_assert(res->phy_reset);
 	clk_disable_unprepare(res->iface_clk);
 	clk_disable_unprepare(res->core_clk);
@@ -343,6 +349,12 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
 		goto err_deassert_ahb;
 	}
 
+	ret = reset_control_deassert(res->ext_reset);
+	if (ret) {
+		dev_err(dev, "cannot deassert ext reset\n");
+		goto err_deassert_ahb;
+	}
+
 	/* enable PCIe clocks and resets */
 	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
 	val &= ~BIT(0);
-- 
2.25.1

[PATCH v5 07/11] PCI: qcom: Define some PARF params needed for ipq8064 SoC

[Ansuel Smith]

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+
Reviewed-by: Rob Herring <robh@kernel.org>
---
 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

[PATCH v5 08/11] PCI: qcom: Add support for tx term offset for rev 2.1.0

[Ansuel Smith]

Add tx term offset support to pcie qcom driver need in some revision of
the ipq806x SoC. Ipq8064 needs tx term offset set to 7.

Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver")
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Cc: stable@vger.kernel.org # v4.5+
---
 drivers/pci/controller/dwc/pcie-qcom.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index f5398b0d270c..2cd6d1456210 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -45,6 +45,9 @@
 #define PCIE_CAP_CPL_TIMEOUT_DISABLE		0x10
 
 #define PCIE20_PARF_PHY_CTRL			0x40
+#define PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK	GENMASK(20, 16)
+#define PHY_CTRL_PHY_TX0_TERM_OFFSET(x)		((x) << 16)
+
 #define PCIE20_PARF_PHY_REFCLK			0x4C
 #define PHY_REFCLK_SSP_EN			BIT(16)
 #define PHY_REFCLK_USE_PAD			BIT(12)
@@ -374,9 +377,18 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
 		writel(PHY_RX0_EQ(4), pcie->parf + PCIE20_PARF_CONFIG_BITS);
 	}
 
+	if (of_device_is_compatible(node, "qcom,pcie-ipq8064")) {
+		/* set TX termination offset */
+		val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
+		val &= ~PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK;
+		val |= PHY_CTRL_PHY_TX0_TERM_OFFSET(7);
+		writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL);
+	}
+
 	/* enable external reference clock */
 	val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK);
-	val |= BIT(16);
+	val &= ~PHY_REFCLK_USE_PAD;
+	val |= PHY_REFCLK_SSP_EN;
 	writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK);
 
 	/* wait for clock acquisition */
-- 
2.25.1

Re: [PATCH v5 07/11] PCI: qcom: Define some PARF params needed for ipq8064 SoC

[Sasha Levin]

Hi

[This is an automated email]

This commit has been processed because it contains a "Fixes:" tag
fixing commit: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver").

The bot has tested the following trees: v5.6.15, v5.4.43, v4.19.125, v4.14.182, v4.9.225.

v5.6.15: Build OK!
v5.4.43: Build OK!
v4.19.125: Build OK!
v4.14.182: Failed to apply! Possible dependencies:
    Unable to calculate

v4.9.225: Failed to apply! Possible dependencies:
    19ce01cc8cbc ("PCI: dwc: all: Rename cfg_read/cfg_write to read/write")
    1d77040bde2d ("PCI: layerscape: Add LS1046a support")
    1f6c4501c667 ("PCI: dra7xx: Group PHY API invocations")
    40f67fb2c384 ("PCI: dwc: designware: Get device pointer at the start of dw_pcie_host_init()")
    442ec4c04d12 ("PCI: dwc: all: Split struct pcie_port into host-only and core structures")
    9bcf0a6fdc50 ("PCI: dwc: all: Use platform_set_drvdata() to save private data")
    ab5fe4f4d31e ("PCI: dra7xx: Add support to force RC to work in GEN1 mode")
    ad719956a848 ("PCI: hisi: Remove redundant error message from hisi_pcie_probe()")
    e594233803aa ("PCI: layerscape: Remove redundant error message from ls_pcie_probe()")
    ebe85a44aad4 ("PCI: dra7xx: Enable MSI and legacy interrupts simultaneously")


NOTE: The patch will not be queued to stable trees until it is upstream.

How should we proceed with this patch?

-- 
Thanks
Sasha

Re: [PATCH v5 07/11] PCI: qcom: Define some PARF params needed for ipq8064 SoC

[Stanimir Varbanov]

Hi,

On 6/2/20 2:53 PM, Ansuel Smith wrote:
> 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+
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
>  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)

These two are not used in the patch, please move it in 08/11.

> +
>  #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);

Please fix the indentations above.

> +		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);
> 

-- 
regards,
Stan