linux-kernel - Re: [PATCH 3/3] phy: starfive: jh7110-usb: Fix link configuration to controller

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Message-ID:
 <SHXPR01MB086373887A29C696747FB365E6B32@SHXPR01MB0863.CHNPR01.prod.partner.outlook.cn>
Date: Fri, 2 Aug 2024 10:45:26 +0000
From: Minda Chen <minda.chen@...rfivetech.com>
To: Jan Kiszka <jan.kiszka@...mens.com>, Vinod Koul <vkoul@...nel.org>, Kishon
 Vijay Abraham I <kishon@...nel.org>
CC: "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] phy: starfive: jh7110-usb: Fix link configuration to
 controller



> 
> From: Jan Kiszka <jan.kiszka@...mens.com>
> 
> In order to connect the USB 2.0 PHY to its controller, we also need to set
> "u0_pdrstn_split_sw_usbpipe_plugen" [1]. Some downstream U-Boot versions
> did that, but upstream firmware does not, and the kernel must not rely on such
> behavior anyway. Failing to set this left the USB gadget port invisible to
> connected hosts behind.
> 
> Link:
> https://doc-en.rvspace.org/JH7110/TRM/JH7110_TRM/sys_syscon.html#sys_sys
> con__section_b3l_fqs_wsb [1]
> Fixes: 16d3a71c20cf ("phy: starfive: Add JH7110 USB 2.0 PHY driver")
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  drivers/phy/starfive/phy-jh7110-usb.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/phy/starfive/phy-jh7110-usb.c
> b/drivers/phy/starfive/phy-jh7110-usb.c
> index 633912f8a05d..67882bc4cebc 100644
> --- a/drivers/phy/starfive/phy-jh7110-usb.c
> +++ b/drivers/phy/starfive/phy-jh7110-usb.c
> @@ -10,18 +10,24 @@
>  #include <linux/clk.h>
>  #include <linux/err.h>
>  #include <linux/io.h>
> +#include <linux/mfd/syscon.h>
>  #include <linux/module.h>
>  #include <linux/phy/phy.h>
>  #include <linux/platform_device.h>
> +#include <linux/regmap.h>
>  #include <linux/usb/of.h>
> 
>  #define USB_125M_CLK_RATE		125000000
>  #define USB_LS_KEEPALIVE_OFF		0x4
>  #define USB_LS_KEEPALIVE_ENABLE		BIT(4)
> 
> +#define USB_PDRSTN_SPLIT		BIT(17)
> +
>  struct jh7110_usb2_phy {
>  	struct phy *phy;
>  	void __iomem *regs;
> +	struct regmap *sys_syscon;
> +	u32 sys_phy_connect;
>  	struct clk *usb_125m_clk;
>  	struct clk *app_125m;
>  	enum phy_mode mode;
> @@ -61,6 +67,10 @@ static int usb2_phy_set_mode(struct phy *_phy,
>  		usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE));
>  	}
> 
> +	/* Connect usb 2.0 phy mode */
> +	regmap_update_bits(phy->sys_syscon, phy->sys_phy_connect,
> +			   USB_PDRSTN_SPLIT, USB_PDRSTN_SPLIT);
> +
>  	return 0;
>  }
> 
> @@ -101,6 +111,7 @@ static int jh7110_usb_phy_probe(struct
> platform_device *pdev)
>  	struct jh7110_usb2_phy *phy;
>  	struct device *dev = &pdev->dev;
>  	struct phy_provider *phy_provider;
> +	u32 args[1];
> 
>  	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
>  	if (!phy)
> @@ -129,6 +140,15 @@ static int jh7110_usb_phy_probe(struct
> platform_device *pdev)
>  	phy_set_drvdata(phy->phy, phy);
>  	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> 
> +	phy->sys_syscon =
> +		syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
> +						     "starfive,sys-syscon",
> +						     1, args);
> +	if (IS_ERR(phy->sys_syscon))
> +		return dev_err_probe(dev, PTR_ERR(phy->phy),
> +			"Failed to get sys-syscon\n");
> +	phy->sys_phy_connect = args[0];
> +
>  	return PTR_ERR_OR_ZERO(phy_provider);
>  }
> 
Reviewed-by: Minda Chen <minda.chen@...rfivetech.com>