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Message-ID: <8ac849abc7be722e163dbd8f2ae8ee144fd49e9b.camel@pengutronix.de>
Date: Wed, 13 Jul 2022 10:15:06 +0200
From: Lucas Stach <l.stach@...gutronix.de>
To: Richard Zhu <hongxing.zhu@....com>, bhelgaas@...gle.com,
robh+dt@...nel.org, broonie@...nel.org, lorenzo.pieralisi@....com,
festevam@...il.com, francesco.dolcini@...adex.com
Cc: linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, kernel@...gutronix.de,
linux-imx@....com
Subject: Re: [PATCH v14 02/17] PCI: imx6: Move PHY management functions
together
Am Freitag, dem 01.07.2022 um 11:25 +0800 schrieb Richard Zhu:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> Collect imx6_pcie_init_phy(), imx7d_pcie_wait_for_phy_pll_lock(), and
> imx6_setup_phy_mpll() earlier with other PHY-related code. No functional
> change intended.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Acked-by: Richard Zhu <hongxing.zhu@....com>
Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> ---
> drivers/pci/controller/dwc/pci-imx6.c | 256 +++++++++++++-------------
> 1 file changed, 128 insertions(+), 128 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 8653ca8cbfb9..e63eb6380020 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -296,6 +296,134 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, u16 data)
> return 0;
> }
>
> +static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
> +{
> + switch (imx6_pcie->drvdata->variant) {
> + case IMX8MM:
> + /*
> + * The PHY initialization had been done in the PHY
> + * driver, break here directly.
> + */
> + break;
> + case IMX8MQ:
> + /*
> + * TODO: Currently this code assumes external
> + * oscillator is being used
> + */
> + regmap_update_bits(imx6_pcie->iomuxc_gpr,
> + imx6_pcie_grp_offset(imx6_pcie),
> + IMX8MQ_GPR_PCIE_REF_USE_PAD,
> + IMX8MQ_GPR_PCIE_REF_USE_PAD);
> + /*
> + * Regarding the datasheet, the PCIE_VPH is suggested
> + * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
> + * VREG_BYPASS should be cleared to zero.
> + */
> + if (imx6_pcie->vph &&
> + regulator_get_voltage(imx6_pcie->vph) > 3000000)
> + regmap_update_bits(imx6_pcie->iomuxc_gpr,
> + imx6_pcie_grp_offset(imx6_pcie),
> + IMX8MQ_GPR_PCIE_VREG_BYPASS,
> + 0);
> + break;
> + case IMX7D:
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
> + break;
> + case IMX6SX:
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> + IMX6SX_GPR12_PCIE_RX_EQ_2);
> + fallthrough;
> + default:
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
> +
> + /* configure constant input signal to the pcie ctrl and phy */
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
> +
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> + IMX6Q_GPR8_TX_DEEMPH_GEN1,
> + imx6_pcie->tx_deemph_gen1 << 0);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> + IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB,
> + imx6_pcie->tx_deemph_gen2_3p5db << 6);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> + IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB,
> + imx6_pcie->tx_deemph_gen2_6db << 12);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> + IMX6Q_GPR8_TX_SWING_FULL,
> + imx6_pcie->tx_swing_full << 18);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> + IMX6Q_GPR8_TX_SWING_LOW,
> + imx6_pcie->tx_swing_low << 25);
> + break;
> + }
> +
> + imx6_pcie_configure_type(imx6_pcie);
> +}
> +
> +static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
> +{
> + u32 val;
> + struct device *dev = imx6_pcie->pci->dev;
> +
> + if (regmap_read_poll_timeout(imx6_pcie->iomuxc_gpr,
> + IOMUXC_GPR22, val,
> + val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED,
> + PHY_PLL_LOCK_WAIT_USLEEP_MAX,
> + PHY_PLL_LOCK_WAIT_TIMEOUT))
> + dev_err(dev, "PCIe PLL lock timeout\n");
> +}
> +
> +static int imx6_setup_phy_mpll(struct imx6_pcie *imx6_pcie)
> +{
> + unsigned long phy_rate = clk_get_rate(imx6_pcie->pcie_phy);
> + int mult, div;
> + u16 val;
> +
> + if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
> + return 0;
> +
> + switch (phy_rate) {
> + case 125000000:
> + /*
> + * The default settings of the MPLL are for a 125MHz input
> + * clock, so no need to reconfigure anything in that case.
> + */
> + return 0;
> + case 100000000:
> + mult = 25;
> + div = 0;
> + break;
> + case 200000000:
> + mult = 25;
> + div = 1;
> + break;
> + default:
> + dev_err(imx6_pcie->pci->dev,
> + "Unsupported PHY reference clock rate %lu\n", phy_rate);
> + return -EINVAL;
> + }
> +
> + pcie_phy_read(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, &val);
> + val &= ~(PCIE_PHY_MPLL_MULTIPLIER_MASK <<
> + PCIE_PHY_MPLL_MULTIPLIER_SHIFT);
> + val |= mult << PCIE_PHY_MPLL_MULTIPLIER_SHIFT;
> + val |= PCIE_PHY_MPLL_MULTIPLIER_OVRD;
> + pcie_phy_write(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, val);
> +
> + pcie_phy_read(imx6_pcie, PCIE_PHY_ATEOVRD, &val);
> + val &= ~(PCIE_PHY_ATEOVRD_REF_CLKDIV_MASK <<
> + PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT);
> + val |= div << PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT;
> + val |= PCIE_PHY_ATEOVRD_EN;
> + pcie_phy_write(imx6_pcie, PCIE_PHY_ATEOVRD, val);
> +
> + return 0;
> +}
> +
> static void imx6_pcie_reset_phy(struct imx6_pcie *imx6_pcie)
> {
> u16 tmp;
> @@ -500,19 +628,6 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
> return ret;
> }
>
> -static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
> -{
> - u32 val;
> - struct device *dev = imx6_pcie->pci->dev;
> -
> - if (regmap_read_poll_timeout(imx6_pcie->iomuxc_gpr,
> - IOMUXC_GPR22, val,
> - val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED,
> - PHY_PLL_LOCK_WAIT_USLEEP_MAX,
> - PHY_PLL_LOCK_WAIT_TIMEOUT))
> - dev_err(dev, "PCIe PLL lock timeout\n");
> -}
> -
> static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
> {
> struct dw_pcie *pci = imx6_pcie->pci;
> @@ -635,121 +750,6 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
> }
> }
>
> -static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
> -{
> - switch (imx6_pcie->drvdata->variant) {
> - case IMX8MM:
> - /*
> - * The PHY initialization had been done in the PHY
> - * driver, break here directly.
> - */
> - break;
> - case IMX8MQ:
> - /*
> - * TODO: Currently this code assumes external
> - * oscillator is being used
> - */
> - regmap_update_bits(imx6_pcie->iomuxc_gpr,
> - imx6_pcie_grp_offset(imx6_pcie),
> - IMX8MQ_GPR_PCIE_REF_USE_PAD,
> - IMX8MQ_GPR_PCIE_REF_USE_PAD);
> - /*
> - * Regarding the datasheet, the PCIE_VPH is suggested
> - * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
> - * VREG_BYPASS should be cleared to zero.
> - */
> - if (imx6_pcie->vph &&
> - regulator_get_voltage(imx6_pcie->vph) > 3000000)
> - regmap_update_bits(imx6_pcie->iomuxc_gpr,
> - imx6_pcie_grp_offset(imx6_pcie),
> - IMX8MQ_GPR_PCIE_VREG_BYPASS,
> - 0);
> - break;
> - case IMX7D:
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> - IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
> - break;
> - case IMX6SX:
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> - IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> - IMX6SX_GPR12_PCIE_RX_EQ_2);
> - fallthrough;
> - default:
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> - IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
> -
> - /* configure constant input signal to the pcie ctrl and phy */
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> - IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
> -
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> - IMX6Q_GPR8_TX_DEEMPH_GEN1,
> - imx6_pcie->tx_deemph_gen1 << 0);
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> - IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB,
> - imx6_pcie->tx_deemph_gen2_3p5db << 6);
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> - IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB,
> - imx6_pcie->tx_deemph_gen2_6db << 12);
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> - IMX6Q_GPR8_TX_SWING_FULL,
> - imx6_pcie->tx_swing_full << 18);
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
> - IMX6Q_GPR8_TX_SWING_LOW,
> - imx6_pcie->tx_swing_low << 25);
> - break;
> - }
> -
> - imx6_pcie_configure_type(imx6_pcie);
> -}
> -
> -static int imx6_setup_phy_mpll(struct imx6_pcie *imx6_pcie)
> -{
> - unsigned long phy_rate = clk_get_rate(imx6_pcie->pcie_phy);
> - int mult, div;
> - u16 val;
> -
> - if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
> - return 0;
> -
> - switch (phy_rate) {
> - case 125000000:
> - /*
> - * The default settings of the MPLL are for a 125MHz input
> - * clock, so no need to reconfigure anything in that case.
> - */
> - return 0;
> - case 100000000:
> - mult = 25;
> - div = 0;
> - break;
> - case 200000000:
> - mult = 25;
> - div = 1;
> - break;
> - default:
> - dev_err(imx6_pcie->pci->dev,
> - "Unsupported PHY reference clock rate %lu\n", phy_rate);
> - return -EINVAL;
> - }
> -
> - pcie_phy_read(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, &val);
> - val &= ~(PCIE_PHY_MPLL_MULTIPLIER_MASK <<
> - PCIE_PHY_MPLL_MULTIPLIER_SHIFT);
> - val |= mult << PCIE_PHY_MPLL_MULTIPLIER_SHIFT;
> - val |= PCIE_PHY_MPLL_MULTIPLIER_OVRD;
> - pcie_phy_write(imx6_pcie, PCIE_PHY_MPLL_OVRD_IN_LO, val);
> -
> - pcie_phy_read(imx6_pcie, PCIE_PHY_ATEOVRD, &val);
> - val &= ~(PCIE_PHY_ATEOVRD_REF_CLKDIV_MASK <<
> - PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT);
> - val |= div << PCIE_PHY_ATEOVRD_REF_CLKDIV_SHIFT;
> - val |= PCIE_PHY_ATEOVRD_EN;
> - pcie_phy_write(imx6_pcie, PCIE_PHY_ATEOVRD, val);
> -
> - return 0;
> -}
> -
> static int imx6_pcie_wait_for_speed_change(struct imx6_pcie *imx6_pcie)
> {
> struct dw_pcie *pci = imx6_pcie->pci;
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