diff mbox series

[v10,03/14] PCI: imx6: Simplify reset handling by using by using *_FLAG_HAS_*_RESET

Message ID 20240205173335.1120469-4-Frank.Li@nxp.com
State New
Headers
Series PCI: imx6: Clean up and add imx95 pci support |

Commit Message

Frank Li Feb. 5, 2024, 5:33 p.m. UTC 
  Refactors the reset handling logic in the imx6 PCI driver by adding
IMX6_PCIE_FLAG_HAS_*_RESET bitmask define for drvdata::flags.

The drvdata::flags and a bitmask ensures a cleaner and more scalable
switch-case structure for handling reset.

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    Change from v4 to v5:
    - Add Mani's Reviewed-by tag
    - Fixed MQ_EP's flags
    
    Chagne from v3 to v4:
    - none
    Change from v2 to v3:
    - add Philipp's Reviewed-by tag
    Change from v1 to v2:
    - remove condition check before reset_control_(de)assert() because it is
      none ops if a NULL pointer pass down.
    - still keep condition check at probe to help identify dts file mismatch
      problem.
    
    Change from v1 to v2:
    - remove condition check before reset_control_(de)assert() because it is
      none ops if a NULL pointer pass down.
    - still keep condition check at probe to help identify dts file mismatch
      problem.

 drivers/pci/controller/dwc/pci-imx6.c | 105 ++++++++++----------------
 1 file changed, 39 insertions(+), 66 deletions(-)

Comments

Lorenzo Pieralisi Feb. 13, 2024, 11:41 a.m. UTC | #1 
On Mon, Feb 05, 2024 at 12:33:24PM -0500, Frank Li wrote:
> Refactors the reset handling logic in the imx6 PCI driver by adding
> IMX6_PCIE_FLAG_HAS_*_RESET bitmask define for drvdata::flags.
> 
> The drvdata::flags and a bitmask ensures a cleaner and more scalable
> switch-case structure for handling reset.
> 
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
> 
> Notes:
>     Change from v4 to v5:
>     - Add Mani's Reviewed-by tag
>     - Fixed MQ_EP's flags
>     
>     Chagne from v3 to v4:
>     - none
>     Change from v2 to v3:
>     - add Philipp's Reviewed-by tag
>     Change from v1 to v2:
>     - remove condition check before reset_control_(de)assert() because it is
>       none ops if a NULL pointer pass down.
>     - still keep condition check at probe to help identify dts file mismatch
>       problem.
>     
>     Change from v1 to v2:
>     - remove condition check before reset_control_(de)assert() because it is
>       none ops if a NULL pointer pass down.
>     - still keep condition check at probe to help identify dts file mismatch
>       problem.
> 
>  drivers/pci/controller/dwc/pci-imx6.c | 105 ++++++++++----------------
>  1 file changed, 39 insertions(+), 66 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 59f117f855c26..a1653b58051b7 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -61,6 +61,8 @@ enum imx6_pcie_variants {
>  #define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE	BIT(1)
>  #define IMX6_PCIE_FLAG_SUPPORTS_SUSPEND		BIT(2)
>  #define IMX6_PCIE_FLAG_HAS_PHYDRV			BIT(3)
> +#define IMX6_PCIE_FLAG_HAS_APP_RESET		BIT(4)
> +#define IMX6_PCIE_FLAG_HAS_PHY_RESET		BIT(5)
>  
>  #define imx6_check_flag(pci, val)     (pci->drvdata->flags & val)
>  
> @@ -661,18 +663,10 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
>  
>  static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
>  {
> +	reset_control_assert(imx6_pcie->pciephy_reset);
> +	reset_control_assert(imx6_pcie->apps_reset);
> +
>  	switch (imx6_pcie->drvdata->variant) {
> -	case IMX7D:
> -	case IMX8MQ:
> -	case IMX8MQ_EP:
> -		reset_control_assert(imx6_pcie->pciephy_reset);
> -		fallthrough;
> -	case IMX8MM:
> -	case IMX8MM_EP:
> -	case IMX8MP:
> -	case IMX8MP_EP:
> -		reset_control_assert(imx6_pcie->apps_reset);
> -		break;
>  	case IMX6SX:
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> @@ -693,6 +687,8 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
>  				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
>  		break;
> +	default:
> +		break;
>  	}
>  
>  	/* Some boards don't have PCIe reset GPIO. */
> @@ -706,14 +702,10 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
>  	struct dw_pcie *pci = imx6_pcie->pci;
>  	struct device *dev = pci->dev;
>  
> +	reset_control_deassert(imx6_pcie->pciephy_reset);
> +
>  	switch (imx6_pcie->drvdata->variant) {
> -	case IMX8MQ:
> -	case IMX8MQ_EP:
> -		reset_control_deassert(imx6_pcie->pciephy_reset);
> -		break;
>  	case IMX7D:
> -		reset_control_deassert(imx6_pcie->pciephy_reset);
> -
>  		/* Workaround for ERR010728, failure of PCI-e PLL VCO to
>  		 * oscillate, especially when cold.  This turns off "Duty-cycle
>  		 * Corrector" and other mysterious undocumented things.
> @@ -745,11 +737,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
>  
>  		usleep_range(200, 500);
>  		break;
> -	case IMX6Q:		/* Nothing to do */
> -	case IMX8MM:
> -	case IMX8MM_EP:
> -	case IMX8MP:
> -	case IMX8MP_EP:
> +	default:
>  		break;
>  	}
>  
> @@ -796,16 +784,11 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
>  				   IMX6Q_GPR12_PCIE_CTL_2,
>  				   IMX6Q_GPR12_PCIE_CTL_2);
>  		break;
> -	case IMX7D:
> -	case IMX8MQ:
> -	case IMX8MQ_EP:
> -	case IMX8MM:
> -	case IMX8MM_EP:
> -	case IMX8MP:
> -	case IMX8MP_EP:
> -		reset_control_deassert(imx6_pcie->apps_reset);
> +	default:
>  		break;
>  	}
> +
> +	reset_control_deassert(imx6_pcie->apps_reset);

You rely on the fact that passing NULL is a no-op on platforms where
this wasn't called before (valid question for other hunks in this commit),
correct ?

Just checking, it does not make things much cleaner but I am not opposed to
this change.

Thanks,
Lorenzo

>  }
>  
>  static void imx6_pcie_ltssm_disable(struct device *dev)
> @@ -819,16 +802,11 @@ static void imx6_pcie_ltssm_disable(struct device *dev)
>  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
>  				   IMX6Q_GPR12_PCIE_CTL_2, 0);
>  		break;
> -	case IMX7D:
> -	case IMX8MQ:
> -	case IMX8MQ_EP:
> -	case IMX8MM:
> -	case IMX8MM_EP:
> -	case IMX8MP:
> -	case IMX8MP_EP:
> -		reset_control_assert(imx6_pcie->apps_reset);
> +	default:
>  		break;
>  	}
> +
> +	reset_control_assert(imx6_pcie->apps_reset);
>  }
>  
>  static int imx6_pcie_start_link(struct dw_pcie *pci)
> @@ -1287,38 +1265,26 @@ static int imx6_pcie_probe(struct platform_device *pdev)
>  					     "failed to get pcie phy\n");
>  	}
>  
> +	if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_APP_RESET)) {
> +		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev, "apps");
> +		if (IS_ERR(imx6_pcie->apps_reset))
> +			return dev_err_probe(dev, PTR_ERR(imx6_pcie->apps_reset),
> +					     "failed to get pcie apps reset control\n");
> +	}
> +
> +	if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_PHY_RESET)) {
> +		imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev, "pciephy");
> +		if (IS_ERR(imx6_pcie->pciephy_reset))
> +			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pciephy_reset),
> +					     "Failed to get PCIEPHY reset control\n");
> +	}
> +
>  	switch (imx6_pcie->drvdata->variant) {
>  	case IMX8MQ:
>  	case IMX8MQ_EP:
>  	case IMX7D:
>  		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
>  			imx6_pcie->controller_id = 1;
> -
> -		imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev,
> -									    "pciephy");
> -		if (IS_ERR(imx6_pcie->pciephy_reset)) {
> -			dev_err(dev, "Failed to get PCIEPHY reset control\n");
> -			return PTR_ERR(imx6_pcie->pciephy_reset);
> -		}
> -
> -		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
> -									 "apps");
> -		if (IS_ERR(imx6_pcie->apps_reset)) {
> -			dev_err(dev, "Failed to get PCIE APPS reset control\n");
> -			return PTR_ERR(imx6_pcie->apps_reset);
> -		}
> -		break;
> -	case IMX8MM:
> -	case IMX8MM_EP:
> -	case IMX8MP:
> -	case IMX8MP_EP:
> -		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
> -									 "apps");
> -		if (IS_ERR(imx6_pcie->apps_reset))
> -			return dev_err_probe(dev, PTR_ERR(imx6_pcie->apps_reset),
> -					     "failed to get pcie apps reset control\n");
> -
> -		break;
>  	default:
>  		break;
>  	}
> @@ -1448,13 +1414,17 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  	},
>  	[IMX7D] = {
>  		.variant = IMX7D,
> -		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
> +		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
> +			 IMX6_PCIE_FLAG_HAS_APP_RESET |
> +			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
>  		.gpr = "fsl,imx7d-iomuxc-gpr",
>  		.clk_names = imx6q_clks,
>  		.clks_cnt = ARRAY_SIZE(imx6q_clks),
>  	},
>  	[IMX8MQ] = {
>  		.variant = IMX8MQ,
> +		.flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> +			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
>  		.gpr = "fsl,imx8mq-iomuxc-gpr",
>  		.clk_names = imx8mq_clks,
>  		.clks_cnt = ARRAY_SIZE(imx8mq_clks),
> @@ -1471,13 +1441,16 @@ static const struct imx6_pcie_drvdata drvdata[] = {
>  	[IMX8MP] = {
>  		.variant = IMX8MP,
>  		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
> -			 IMX6_PCIE_FLAG_HAS_PHYDRV,
> +			 IMX6_PCIE_FLAG_HAS_PHYDRV |
> +			 IMX6_PCIE_FLAG_HAS_APP_RESET,
>  		.gpr = "fsl,imx8mp-iomuxc-gpr",
>  		.clk_names = imx8mm_clks,
>  		.clks_cnt = ARRAY_SIZE(imx8mm_clks),
>  	},
>  	[IMX8MQ_EP] = {
>  		.variant = IMX8MQ_EP,
> +		.flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> +			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
>  		.mode = DW_PCIE_EP_TYPE,
>  		.gpr = "fsl,imx8mq-iomuxc-gpr",
>  		.clk_names = imx8mq_clks,
> -- 
> 2.34.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Frank Li Feb. 13, 2024, 3:20 p.m. UTC | #2 
On Tue, Feb 13, 2024 at 12:41:10PM +0100, Lorenzo Pieralisi wrote:
> On Mon, Feb 05, 2024 at 12:33:24PM -0500, Frank Li wrote:
> > Refactors the reset handling logic in the imx6 PCI driver by adding
> > IMX6_PCIE_FLAG_HAS_*_RESET bitmask define for drvdata::flags.
> > 
> > The drvdata::flags and a bitmask ensures a cleaner and more scalable
> > switch-case structure for handling reset.
> > 
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> > Signed-off-by: Frank Li <Frank.Li@nxp.com>
> > ---
> > 
> > Notes:
> >     Change from v4 to v5:
> >     - Add Mani's Reviewed-by tag
> >     - Fixed MQ_EP's flags
> >     
> >     Chagne from v3 to v4:
> >     - none
> >     Change from v2 to v3:
> >     - add Philipp's Reviewed-by tag
> >     Change from v1 to v2:
> >     - remove condition check before reset_control_(de)assert() because it is
> >       none ops if a NULL pointer pass down.
> >     - still keep condition check at probe to help identify dts file mismatch
> >       problem.
> >     
> >     Change from v1 to v2:
> >     - remove condition check before reset_control_(de)assert() because it is
> >       none ops if a NULL pointer pass down.
> >     - still keep condition check at probe to help identify dts file mismatch
> >       problem.
> > 
> >  drivers/pci/controller/dwc/pci-imx6.c | 105 ++++++++++----------------
> >  1 file changed, 39 insertions(+), 66 deletions(-)
> > 
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > index 59f117f855c26..a1653b58051b7 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -61,6 +61,8 @@ enum imx6_pcie_variants {
> >  #define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE	BIT(1)
> >  #define IMX6_PCIE_FLAG_SUPPORTS_SUSPEND		BIT(2)
> >  #define IMX6_PCIE_FLAG_HAS_PHYDRV			BIT(3)
> > +#define IMX6_PCIE_FLAG_HAS_APP_RESET		BIT(4)
> > +#define IMX6_PCIE_FLAG_HAS_PHY_RESET		BIT(5)
> >  
> >  #define imx6_check_flag(pci, val)     (pci->drvdata->flags & val)
> >  
> > @@ -661,18 +663,10 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
> >  
> >  static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
> >  {
> > +	reset_control_assert(imx6_pcie->pciephy_reset);
> > +	reset_control_assert(imx6_pcie->apps_reset);
> > +
> >  	switch (imx6_pcie->drvdata->variant) {
> > -	case IMX7D:
> > -	case IMX8MQ:
> > -	case IMX8MQ_EP:
> > -		reset_control_assert(imx6_pcie->pciephy_reset);
> > -		fallthrough;
> > -	case IMX8MM:
> > -	case IMX8MM_EP:
> > -	case IMX8MP:
> > -	case IMX8MP_EP:
> > -		reset_control_assert(imx6_pcie->apps_reset);
> > -		break;
> >  	case IMX6SX:
> >  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> >  				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> > @@ -693,6 +687,8 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
> >  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> >  				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> >  		break;
> > +	default:
> > +		break;
> >  	}
> >  
> >  	/* Some boards don't have PCIe reset GPIO. */
> > @@ -706,14 +702,10 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
> >  	struct dw_pcie *pci = imx6_pcie->pci;
> >  	struct device *dev = pci->dev;
> >  
> > +	reset_control_deassert(imx6_pcie->pciephy_reset);
> > +
> >  	switch (imx6_pcie->drvdata->variant) {
> > -	case IMX8MQ:
> > -	case IMX8MQ_EP:
> > -		reset_control_deassert(imx6_pcie->pciephy_reset);
> > -		break;
> >  	case IMX7D:
> > -		reset_control_deassert(imx6_pcie->pciephy_reset);
> > -
> >  		/* Workaround for ERR010728, failure of PCI-e PLL VCO to
> >  		 * oscillate, especially when cold.  This turns off "Duty-cycle
> >  		 * Corrector" and other mysterious undocumented things.
> > @@ -745,11 +737,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
> >  
> >  		usleep_range(200, 500);
> >  		break;
> > -	case IMX6Q:		/* Nothing to do */
> > -	case IMX8MM:
> > -	case IMX8MM_EP:
> > -	case IMX8MP:
> > -	case IMX8MP_EP:
> > +	default:
> >  		break;
> >  	}
> >  
> > @@ -796,16 +784,11 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
> >  				   IMX6Q_GPR12_PCIE_CTL_2,
> >  				   IMX6Q_GPR12_PCIE_CTL_2);
> >  		break;
> > -	case IMX7D:
> > -	case IMX8MQ:
> > -	case IMX8MQ_EP:
> > -	case IMX8MM:
> > -	case IMX8MM_EP:
> > -	case IMX8MP:
> > -	case IMX8MP_EP:
> > -		reset_control_deassert(imx6_pcie->apps_reset);
> > +	default:
> >  		break;
> >  	}
> > +
> > +	reset_control_deassert(imx6_pcie->apps_reset);
> 
> You rely on the fact that passing NULL is a no-op on platforms where
> this wasn't called before (valid question for other hunks in this commit),
> correct ?
> 

Thank you take time to review it. 
Yes, it follow Philipp's suggestion. Remove conditional check at v2.

Frank

> Just checking, it does not make things much cleaner but I am not opposed to
> this change.
> 
> Thanks,
> Lorenzo
> 
> >  }
> >  
> >  static void imx6_pcie_ltssm_disable(struct device *dev)
> > @@ -819,16 +802,11 @@ static void imx6_pcie_ltssm_disable(struct device *dev)
> >  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> >  				   IMX6Q_GPR12_PCIE_CTL_2, 0);
> >  		break;
> > -	case IMX7D:
> > -	case IMX8MQ:
> > -	case IMX8MQ_EP:
> > -	case IMX8MM:
> > -	case IMX8MM_EP:
> > -	case IMX8MP:
> > -	case IMX8MP_EP:
> > -		reset_control_assert(imx6_pcie->apps_reset);
> > +	default:
> >  		break;
> >  	}
> > +
> > +	reset_control_assert(imx6_pcie->apps_reset);
> >  }
> >  
> >  static int imx6_pcie_start_link(struct dw_pcie *pci)
> > @@ -1287,38 +1265,26 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> >  					     "failed to get pcie phy\n");
> >  	}
> >  
> > +	if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_APP_RESET)) {
> > +		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev, "apps");
> > +		if (IS_ERR(imx6_pcie->apps_reset))
> > +			return dev_err_probe(dev, PTR_ERR(imx6_pcie->apps_reset),
> > +					     "failed to get pcie apps reset control\n");
> > +	}
> > +
> > +	if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_PHY_RESET)) {
> > +		imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev, "pciephy");
> > +		if (IS_ERR(imx6_pcie->pciephy_reset))
> > +			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pciephy_reset),
> > +					     "Failed to get PCIEPHY reset control\n");
> > +	}
> > +
> >  	switch (imx6_pcie->drvdata->variant) {
> >  	case IMX8MQ:
> >  	case IMX8MQ_EP:
> >  	case IMX7D:
> >  		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
> >  			imx6_pcie->controller_id = 1;
> > -
> > -		imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev,
> > -									    "pciephy");
> > -		if (IS_ERR(imx6_pcie->pciephy_reset)) {
> > -			dev_err(dev, "Failed to get PCIEPHY reset control\n");
> > -			return PTR_ERR(imx6_pcie->pciephy_reset);
> > -		}
> > -
> > -		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
> > -									 "apps");
> > -		if (IS_ERR(imx6_pcie->apps_reset)) {
> > -			dev_err(dev, "Failed to get PCIE APPS reset control\n");
> > -			return PTR_ERR(imx6_pcie->apps_reset);
> > -		}
> > -		break;
> > -	case IMX8MM:
> > -	case IMX8MM_EP:
> > -	case IMX8MP:
> > -	case IMX8MP_EP:
> > -		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
> > -									 "apps");
> > -		if (IS_ERR(imx6_pcie->apps_reset))
> > -			return dev_err_probe(dev, PTR_ERR(imx6_pcie->apps_reset),
> > -					     "failed to get pcie apps reset control\n");
> > -
> > -		break;
> >  	default:
> >  		break;
> >  	}
> > @@ -1448,13 +1414,17 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> >  	},
> >  	[IMX7D] = {
> >  		.variant = IMX7D,
> > -		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
> > +		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
> > +			 IMX6_PCIE_FLAG_HAS_APP_RESET |
> > +			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
> >  		.gpr = "fsl,imx7d-iomuxc-gpr",
> >  		.clk_names = imx6q_clks,
> >  		.clks_cnt = ARRAY_SIZE(imx6q_clks),
> >  	},
> >  	[IMX8MQ] = {
> >  		.variant = IMX8MQ,
> > +		.flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> > +			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
> >  		.gpr = "fsl,imx8mq-iomuxc-gpr",
> >  		.clk_names = imx8mq_clks,
> >  		.clks_cnt = ARRAY_SIZE(imx8mq_clks),
> > @@ -1471,13 +1441,16 @@ static const struct imx6_pcie_drvdata drvdata[] = {
> >  	[IMX8MP] = {
> >  		.variant = IMX8MP,
> >  		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
> > -			 IMX6_PCIE_FLAG_HAS_PHYDRV,
> > +			 IMX6_PCIE_FLAG_HAS_PHYDRV |
> > +			 IMX6_PCIE_FLAG_HAS_APP_RESET,
> >  		.gpr = "fsl,imx8mp-iomuxc-gpr",
> >  		.clk_names = imx8mm_clks,
> >  		.clks_cnt = ARRAY_SIZE(imx8mm_clks),
> >  	},
> >  	[IMX8MQ_EP] = {
> >  		.variant = IMX8MQ_EP,
> > +		.flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
> > +			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
> >  		.mode = DW_PCIE_EP_TYPE,
> >  		.gpr = "fsl,imx8mq-iomuxc-gpr",
> >  		.clk_names = imx8mq_clks,
> > -- 
> > 2.34.1
> > 
> > 
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Bjorn Helgaas March 1, 2024, 7:09 p.m. UTC | #3 
[+cc Nathan]

On Mon, Feb 05, 2024 at 12:33:24PM -0500, Frank Li wrote:
> Refactors the reset handling logic in the imx6 PCI driver by adding
> IMX6_PCIE_FLAG_HAS_*_RESET bitmask define for drvdata::flags.
> 
> The drvdata::flags and a bitmask ensures a cleaner and more scalable
> switch-case structure for handling reset.
> 
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> Signed-off-by: Frank Li <Frank.Li@nxp.com>

Lorenzo, would you mind squashing in Nathan's fix from
https://lore.kernel.org/r/20240301-pci-imx6-fix-clang-implicit-fallthrough-v1-1-db78c7cbb384@kernel.org?

Also, the subject line has a repeated "by using by using".

Bjorn
Frank Li March 1, 2024, 7:33 p.m. UTC | #4 
On Fri, Mar 01, 2024 at 01:09:31PM -0600, Bjorn Helgaas wrote:
> [+cc Nathan]
> 
> On Mon, Feb 05, 2024 at 12:33:24PM -0500, Frank Li wrote:
> > Refactors the reset handling logic in the imx6 PCI driver by adding
> > IMX6_PCIE_FLAG_HAS_*_RESET bitmask define for drvdata::flags.
> > 
> > The drvdata::flags and a bitmask ensures a cleaner and more scalable
> > switch-case structure for handling reset.
> > 
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> > Signed-off-by: Frank Li <Frank.Li@nxp.com>
> 
> Lorenzo, would you mind squashing in Nathan's fix from
> https://lore.kernel.org/r/20240301-pci-imx6-fix-clang-implicit-fallthrough-v1-1-db78c7cbb384@kernel.org?
> 
> Also, the subject line has a repeated "by using by using".

I think that it is good to squashing it.

Frank Li

> 
> Bjorn
Lorenzo Pieralisi March 4, 2024, 8:44 a.m. UTC | #5 
On Fri, Mar 01, 2024 at 01:09:31PM -0600, Bjorn Helgaas wrote:
> [+cc Nathan]
> 
> On Mon, Feb 05, 2024 at 12:33:24PM -0500, Frank Li wrote:
> > Refactors the reset handling logic in the imx6 PCI driver by adding
> > IMX6_PCIE_FLAG_HAS_*_RESET bitmask define for drvdata::flags.
> > 
> > The drvdata::flags and a bitmask ensures a cleaner and more scalable
> > switch-case structure for handling reset.
> > 
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> > Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
> > Signed-off-by: Frank Li <Frank.Li@nxp.com>
> 
> Lorenzo, would you mind squashing in Nathan's fix from
> https://lore.kernel.org/r/20240301-pci-imx6-fix-clang-implicit-fallthrough-v1-1-db78c7cbb384@kernel.org?
> 
> Also, the subject line has a repeated "by using by using".

I will fix it up.

Thanks,
Lorenzo
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 59f117f855c26..a1653b58051b7 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -61,6 +61,8 @@  enum imx6_pcie_variants {
 #define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE	BIT(1)
 #define IMX6_PCIE_FLAG_SUPPORTS_SUSPEND		BIT(2)
 #define IMX6_PCIE_FLAG_HAS_PHYDRV			BIT(3)
+#define IMX6_PCIE_FLAG_HAS_APP_RESET		BIT(4)
+#define IMX6_PCIE_FLAG_HAS_PHY_RESET		BIT(5)
 
 #define imx6_check_flag(pci, val)     (pci->drvdata->flags & val)
 
@@ -661,18 +663,10 @@  static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
 
 static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
 {
+	reset_control_assert(imx6_pcie->pciephy_reset);
+	reset_control_assert(imx6_pcie->apps_reset);
+
 	switch (imx6_pcie->drvdata->variant) {
-	case IMX7D:
-	case IMX8MQ:
-	case IMX8MQ_EP:
-		reset_control_assert(imx6_pcie->pciephy_reset);
-		fallthrough;
-	case IMX8MM:
-	case IMX8MM_EP:
-	case IMX8MP:
-	case IMX8MP_EP:
-		reset_control_assert(imx6_pcie->apps_reset);
-		break;
 	case IMX6SX:
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
@@ -693,6 +687,8 @@  static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
 				   IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
 		break;
+	default:
+		break;
 	}
 
 	/* Some boards don't have PCIe reset GPIO. */
@@ -706,14 +702,10 @@  static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 	struct dw_pcie *pci = imx6_pcie->pci;
 	struct device *dev = pci->dev;
 
+	reset_control_deassert(imx6_pcie->pciephy_reset);
+
 	switch (imx6_pcie->drvdata->variant) {
-	case IMX8MQ:
-	case IMX8MQ_EP:
-		reset_control_deassert(imx6_pcie->pciephy_reset);
-		break;
 	case IMX7D:
-		reset_control_deassert(imx6_pcie->pciephy_reset);
-
 		/* Workaround for ERR010728, failure of PCI-e PLL VCO to
 		 * oscillate, especially when cold.  This turns off "Duty-cycle
 		 * Corrector" and other mysterious undocumented things.
@@ -745,11 +737,7 @@  static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 
 		usleep_range(200, 500);
 		break;
-	case IMX6Q:		/* Nothing to do */
-	case IMX8MM:
-	case IMX8MM_EP:
-	case IMX8MP:
-	case IMX8MP_EP:
+	default:
 		break;
 	}
 
@@ -796,16 +784,11 @@  static void imx6_pcie_ltssm_enable(struct device *dev)
 				   IMX6Q_GPR12_PCIE_CTL_2,
 				   IMX6Q_GPR12_PCIE_CTL_2);
 		break;
-	case IMX7D:
-	case IMX8MQ:
-	case IMX8MQ_EP:
-	case IMX8MM:
-	case IMX8MM_EP:
-	case IMX8MP:
-	case IMX8MP_EP:
-		reset_control_deassert(imx6_pcie->apps_reset);
+	default:
 		break;
 	}
+
+	reset_control_deassert(imx6_pcie->apps_reset);
 }
 
 static void imx6_pcie_ltssm_disable(struct device *dev)
@@ -819,16 +802,11 @@  static void imx6_pcie_ltssm_disable(struct device *dev)
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 				   IMX6Q_GPR12_PCIE_CTL_2, 0);
 		break;
-	case IMX7D:
-	case IMX8MQ:
-	case IMX8MQ_EP:
-	case IMX8MM:
-	case IMX8MM_EP:
-	case IMX8MP:
-	case IMX8MP_EP:
-		reset_control_assert(imx6_pcie->apps_reset);
+	default:
 		break;
 	}
+
+	reset_control_assert(imx6_pcie->apps_reset);
 }
 
 static int imx6_pcie_start_link(struct dw_pcie *pci)
@@ -1287,38 +1265,26 @@  static int imx6_pcie_probe(struct platform_device *pdev)
 					     "failed to get pcie phy\n");
 	}
 
+	if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_APP_RESET)) {
+		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev, "apps");
+		if (IS_ERR(imx6_pcie->apps_reset))
+			return dev_err_probe(dev, PTR_ERR(imx6_pcie->apps_reset),
+					     "failed to get pcie apps reset control\n");
+	}
+
+	if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_HAS_PHY_RESET)) {
+		imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev, "pciephy");
+		if (IS_ERR(imx6_pcie->pciephy_reset))
+			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pciephy_reset),
+					     "Failed to get PCIEPHY reset control\n");
+	}
+
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX8MQ:
 	case IMX8MQ_EP:
 	case IMX7D:
 		if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
 			imx6_pcie->controller_id = 1;
-
-		imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev,
-									    "pciephy");
-		if (IS_ERR(imx6_pcie->pciephy_reset)) {
-			dev_err(dev, "Failed to get PCIEPHY reset control\n");
-			return PTR_ERR(imx6_pcie->pciephy_reset);
-		}
-
-		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
-									 "apps");
-		if (IS_ERR(imx6_pcie->apps_reset)) {
-			dev_err(dev, "Failed to get PCIE APPS reset control\n");
-			return PTR_ERR(imx6_pcie->apps_reset);
-		}
-		break;
-	case IMX8MM:
-	case IMX8MM_EP:
-	case IMX8MP:
-	case IMX8MP_EP:
-		imx6_pcie->apps_reset = devm_reset_control_get_exclusive(dev,
-									 "apps");
-		if (IS_ERR(imx6_pcie->apps_reset))
-			return dev_err_probe(dev, PTR_ERR(imx6_pcie->apps_reset),
-					     "failed to get pcie apps reset control\n");
-
-		break;
 	default:
 		break;
 	}
@@ -1448,13 +1414,17 @@  static const struct imx6_pcie_drvdata drvdata[] = {
 	},
 	[IMX7D] = {
 		.variant = IMX7D,
-		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
+		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
+			 IMX6_PCIE_FLAG_HAS_APP_RESET |
+			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
 		.gpr = "fsl,imx7d-iomuxc-gpr",
 		.clk_names = imx6q_clks,
 		.clks_cnt = ARRAY_SIZE(imx6q_clks),
 	},
 	[IMX8MQ] = {
 		.variant = IMX8MQ,
+		.flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
+			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
 		.gpr = "fsl,imx8mq-iomuxc-gpr",
 		.clk_names = imx8mq_clks,
 		.clks_cnt = ARRAY_SIZE(imx8mq_clks),
@@ -1471,13 +1441,16 @@  static const struct imx6_pcie_drvdata drvdata[] = {
 	[IMX8MP] = {
 		.variant = IMX8MP,
 		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND |
-			 IMX6_PCIE_FLAG_HAS_PHYDRV,
+			 IMX6_PCIE_FLAG_HAS_PHYDRV |
+			 IMX6_PCIE_FLAG_HAS_APP_RESET,
 		.gpr = "fsl,imx8mp-iomuxc-gpr",
 		.clk_names = imx8mm_clks,
 		.clks_cnt = ARRAY_SIZE(imx8mm_clks),
 	},
 	[IMX8MQ_EP] = {
 		.variant = IMX8MQ_EP,
+		.flags = IMX6_PCIE_FLAG_HAS_APP_RESET |
+			 IMX6_PCIE_FLAG_HAS_PHY_RESET,
 		.mode = DW_PCIE_EP_TYPE,
 		.gpr = "fsl,imx8mq-iomuxc-gpr",
 		.clk_names = imx8mq_clks,