linux-kernel - Re: [PATCH v13 3/5] PCI: j721e: Add per platform maximum lane settings

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Date:   Tue, 5 Dec 2023 10:42:16 +0530
From:   Ravi Gunasekaran <r-gunasekaran@...com>
To:     Siddharth Vadapalli <s-vadapalli@...com>, <lpieralisi@...nel.org>,
        <robh@...nel.org>, <kw@...ux.com>, <bhelgaas@...gle.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <vigneshr@...com>, <tjoseph@...ence.com>
CC:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <danishanwar@...com>,
        <srk@...com>, <nm@...com>, Ravi Gunasekaran <r-gunasekaran@...com>
Subject: Re: [PATCH v13 3/5] PCI: j721e: Add per platform maximum lane
 settings



On 11/28/23 11:14 AM, Siddharth Vadapalli wrote:
> From: Matt Ranostay <mranostay@...com>
> 
> Various platforms have different maximum amount of lanes that can be
> selected. Add max_lanes to struct j721e_pcie to allow for detection of this
> which is needed to calculate the needed bitmask size for the possible lane
> count.
> 
> Signed-off-by: Matt Ranostay <mranostay@...com>
> Signed-off-by: Achal Verma <a-verma1@...com>
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> ---
>  drivers/pci/controller/cadence/pci-j721e.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
> index 2c87e7728a65..63c758b14314 100644
> --- a/drivers/pci/controller/cadence/pci-j721e.c
> +++ b/drivers/pci/controller/cadence/pci-j721e.c
> @@ -47,8 +47,6 @@ enum link_status {
>  
>  #define GENERATION_SEL_MASK		GENMASK(1, 0)
>  
> -#define MAX_LANES			2
> -
>  struct j721e_pcie {
>  	struct cdns_pcie	*cdns_pcie;
>  	struct clk		*refclk;
> @@ -71,6 +69,7 @@ struct j721e_pcie_data {
>  	unsigned int		quirk_disable_flr:1;
>  	u32			linkdown_irq_regfield;
>  	unsigned int		byte_access_allowed:1;
> +	unsigned int		max_lanes;
>  };
>  
>  static inline u32 j721e_pcie_user_readl(struct j721e_pcie *pcie, u32 offset)
> @@ -290,11 +289,13 @@ static const struct j721e_pcie_data j721e_pcie_rc_data = {
>  	.quirk_retrain_flag = true,
>  	.byte_access_allowed = false,
>  	.linkdown_irq_regfield = LINK_DOWN,
> +	.max_lanes = 2,
>  };
>  
>  static const struct j721e_pcie_data j721e_pcie_ep_data = {
>  	.mode = PCI_MODE_EP,
>  	.linkdown_irq_regfield = LINK_DOWN,
> +	.max_lanes = 2,
>  };
>  
>  static const struct j721e_pcie_data j7200_pcie_rc_data = {
> @@ -302,23 +303,27 @@ static const struct j721e_pcie_data j7200_pcie_rc_data = {
>  	.quirk_detect_quiet_flag = true,
>  	.linkdown_irq_regfield = J7200_LINK_DOWN,
>  	.byte_access_allowed = true,
> +	.max_lanes = 2,
>  };
>  
>  static const struct j721e_pcie_data j7200_pcie_ep_data = {
>  	.mode = PCI_MODE_EP,
>  	.quirk_detect_quiet_flag = true,
>  	.quirk_disable_flr = true,
> +	.max_lanes = 2,
>  };
>  
>  static const struct j721e_pcie_data am64_pcie_rc_data = {
>  	.mode = PCI_MODE_RC,
>  	.linkdown_irq_regfield = J7200_LINK_DOWN,
>  	.byte_access_allowed = true,
> +	.max_lanes = 1,
>  };
>  
>  static const struct j721e_pcie_data am64_pcie_ep_data = {
>  	.mode = PCI_MODE_EP,
>  	.linkdown_irq_regfield = J7200_LINK_DOWN,
> +	.max_lanes = 1,
>  };
>  
>  static const struct of_device_id of_j721e_pcie_match[] = {
> @@ -432,8 +437,10 @@ static int j721e_pcie_probe(struct platform_device *pdev)
>  	pcie->user_cfg_base = base;
>  
>  	ret = of_property_read_u32(node, "num-lanes", &num_lanes);
> -	if (ret || num_lanes > MAX_LANES)
> +	if (ret || num_lanes > data->max_lanes) {
> +		dev_warn(dev, "num-lanes property not provided or invalid, setting num-lanes to 1\n");
>  		num_lanes = 1;
> +	}
>  	pcie->num_lanes = num_lanes;
>  
>  	if (dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)))

Reviewed-by: Ravi Gunasekaran <r-gunasekaran@...com>

-- 
Regards,
Ravi