linux-kernel - Re: [PATCH v3 09/11] PCI: qcom: add ipq8064 rev2 variant and set tx term offset

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Message-ID: <3dc89ec6-d550-9402-1a4a-ca0c6f1e1fb9@mm-sol.com>
Date:   Wed, 13 May 2020 14:37:43 +0300
From:   Stanimir Varbanov <svarbanov@...sol.com>
To:     Ansuel Smith <ansuelsmth@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Sham Muthayyan <smuthayy@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 09/11] PCI: qcom: add ipq8064 rev2 variant and set tx
 term offset

Hi Ansuel,

On 5/1/20 1:06 AM, Ansuel Smith wrote:
> From: Sham Muthayyan <smuthayy@...eaurora.org>
> 
> Add tx term offset support to pcie qcom driver need in some revision of
> the ipq806x SoC.
> Ipq8064 have tx term offset set to 7.
> Ipq8064-v2 revision and ipq8065 have the tx term offset set to 0.
> 
> Signed-off-by: Sham Muthayyan <smuthayy@...eaurora.org>
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index da8058fd1925..372d2c8508b5 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(12, 16)

The mask definition is not correct. Should be 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)
> @@ -118,6 +121,7 @@ struct qcom_pcie_resources_2_1_0 {
>  	u32 tx_swing_full;
>  	u32 tx_swing_low;
>  	u32 rx0_eq;
> +	u8 phy_tx0_term_offset;
>  };
>  
>  struct qcom_pcie_resources_1_0_0 {
> @@ -318,6 +322,11 @@ static int qcom_pcie_get_resources_2_1_0(struct qcom_pcie *pcie)
>  	if (IS_ERR(res->ext_reset))
>  		return PTR_ERR(res->ext_reset);
>  
> +	if (of_device_is_compatible(dev->of_node, "qcom,pcie-ipq8064"))
> +		res->phy_tx0_term_offset = 7;

Before your change the phy_tx0_term_offser was 0 for apq8064, but here
you change it to 7, why?

> +	else
> +		res->phy_tx0_term_offset = 0;
> +
>  	res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
>  	return PTR_ERR_OR_ZERO(res->phy_reset);
>  }
> @@ -402,6 +411,11 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie)
>  	/* enable PCIe clocks and resets */
>  	qcom_clear_and_set_dword(pcie->parf + PCIE20_PARF_PHY_CTRL, BIT(0), 0);
>  
> +	/* set TX termination offset */
> +	qcom_clear_and_set_dword(pcie->parf + PCIE20_PARF_PHY_CTRL,
> +			PHY_CTRL_PHY_TX0_TERM_OFFSET_MASK,

As the mask definition is incorrect you actually clear 12 to 16 bit in
the register where is another PHY parameter. Is that was intentional?

> +			PHY_CTRL_PHY_TX0_TERM_OFFSET(res->phy_tx0_term_offset));
> +
>  	writel(PCS_DEEMPH_TX_DEEMPH_GEN1(res->tx_deemph_gen1) |
>  	       PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(res->tx_deemph_gen2_3p5db) |
>  	       PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(res->tx_deemph_gen2_6db),
> @@ -1485,6 +1499,7 @@ static int qcom_pcie_probe(struct platform_device *pdev)
>  static const struct of_device_id qcom_pcie_match[] = {
>  	{ .compatible = "qcom,pcie-apq8084", .data = &ops_1_0_0 },
>  	{ .compatible = "qcom,pcie-ipq8064", .data = &ops_2_1_0 },
> +	{ .compatible = "qcom,pcie-ipq8064-v2", .data = &ops_2_1_0 },
>  	{ .compatible = "qcom,pcie-apq8064", .data = &ops_2_1_0 },
>  	{ .compatible = "qcom,pcie-msm8996", .data = &ops_2_3_2 },
>  	{ .compatible = "qcom,pcie-ipq8074", .data = &ops_2_3_3 },
> 

-- 
regards,
Stan