[PATCH 0/3] riscv: jh7110: Fix configuration for on-chip USB 2.0 support

[PATCH 0/3] riscv: jh7110: Fix configuration for on-chip USB 2.0 support

[Jan Kiszka]

While mainline has support for the USB controller of the JH7110 since 6.5,
this never really worked, even not with latest downstream kernels by Starfive -
unless you were also using an old downstream U-Boot version. The reason for
that was a missing syscon setting that prevented the connection between USB
2.0 PHY and the controller. This series finally fixes the issue.

Jan

CC: Conor Dooley <conor+dt@kernel.org>
CC: Emil Renner Berthing <kernel@esmil.dk>
CC: Krzysztof Kozlowski <krzk+dt@kernel.org>
CC: Rob Herring <robh@kernel.org>

Jan Kiszka (3):
  dt-bindings: phy: jh7110-usb-phy: Add sys-syscon property
  riscv: dts: starfive: jh7110: Add sys-syscon property to usbphy0
  phy: starfive: jh7110-usb: Fix link configuration to controller

 .../bindings/phy/starfive,jh7110-usb-phy.yaml | 11 ++++++++++
 arch/riscv/boot/dts/starfive/jh7110.dtsi      |  1 +
 drivers/phy/starfive/phy-jh7110-usb.c         | 20 +++++++++++++++++++
 3 files changed, 32 insertions(+)

-- 
2.43.0

[PATCH 1/3] dt-bindings: phy: jh7110-usb-phy: Add sys-syscon property

[Jan Kiszka]

From: Jan Kiszka <jan.kiszka@siemens.com>

Analogously to the PCI PHY, access to sys_syscon is needed to connect
the USB PHY to its controller.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
CC: Rob Herring <robh@kernel.org>
CC: Krzysztof Kozlowski <krzk+dt@kernel.org>
CC: Conor Dooley <conor+dt@kernel.org>
---
 .../bindings/phy/starfive,jh7110-usb-phy.yaml         | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/starfive,jh7110-usb-phy.yaml b/Documentation/devicetree/bindings/phy/starfive,jh7110-usb-phy.yaml
index 269e9f9f12b6..eaf0050c6f17 100644
--- a/Documentation/devicetree/bindings/phy/starfive,jh7110-usb-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/starfive,jh7110-usb-phy.yaml
@@ -19,6 +19,16 @@ properties:
   "#phy-cells":
     const: 0
 
+  starfive,sys-syscon:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: phandle to System Register Controller sys_syscon node.
+          - description: PHY connect offset of SYS_SYSCONSAIF__SYSCFG register for USB PHY.
+    description:
+      The phandle to System Register Controller syscon node and the PHY connect offset
+      of SYS_SYSCONSAIF__SYSCFG register. Connect PHY to USB controller.
+
   clocks:
     items:
       - description: PHY 125m
@@ -47,4 +57,5 @@ examples:
                  <&stgcrg 6>;
         clock-names = "125m", "app_125m";
         #phy-cells = <0>;
+        starfive,sys-syscon = <&sys_syscon 0x18>;
     };
-- 
2.43.0

[PATCH 2/3] riscv: dts: starfive: jh7110: Add sys-syscon property to usbphy0

[Jan Kiszka]

From: Jan Kiszka <jan.kiszka@siemens.com>

Allows the PHY to connect to its USB controller.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
CC: Rob Herring <robh@kernel.org>
CC: Krzysztof Kozlowski <krzk+dt@kernel.org>
CC: Conor Dooley <conor+dt@kernel.org>
---
 arch/riscv/boot/dts/starfive/jh7110.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/boot/dts/starfive/jh7110.dtsi b/arch/riscv/boot/dts/starfive/jh7110.dtsi
index 0d8339357bad..0c0b66a69065 100644
--- a/arch/riscv/boot/dts/starfive/jh7110.dtsi
+++ b/arch/riscv/boot/dts/starfive/jh7110.dtsi
@@ -606,6 +606,7 @@ usbphy0: phy@10200000 {
 				 <&stgcrg JH7110_STGCLK_USB0_APP_125>;
 			clock-names = "125m", "app_125m";
 			#phy-cells = <0>;
+			starfive,sys-syscon = <&sys_syscon 0x18>;
 		};
 
 		pciephy0: phy@10210000 {
-- 
2.43.0

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

[Jan Kiszka]

From: Jan Kiszka <jan.kiszka@siemens.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_syscon__section_b3l_fqs_wsb [1]
Fixes: 16d3a71c20cf ("phy: starfive: Add JH7110 USB 2.0 PHY driver")
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.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);
 }
 
-- 
2.43.0

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

[Minda Chen]

> 
> From: Jan Kiszka <jan.kiszka@siemens.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@siemens.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@starfivetech.com>

Re: [PATCH 1/3] dt-bindings: phy: jh7110-usb-phy: Add sys-syscon property

[Rob Herring (Arm)]

On Wed, 31 Jul 2024 22:18:41 +0200, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@siemens.com>
> 
> Analogously to the PCI PHY, access to sys_syscon is needed to connect
> the USB PHY to its controller.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
> CC: Rob Herring <robh@kernel.org>
> CC: Krzysztof Kozlowski <krzk+dt@kernel.org>
> CC: Conor Dooley <conor+dt@kernel.org>
> ---
>  .../bindings/phy/starfive,jh7110-usb-phy.yaml         | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>

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

[Dan Carpenter]

Hi Jan,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jan-Kiszka/dt-bindings-phy-jh7110-usb-phy-Add-sys-syscon-property/20240802-101748
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/cd7b125c8c797f9d63440944df7121f9db0a49ad.1722457123.git.jan.kiszka%40siemens.com
patch subject: [PATCH 3/3] phy: starfive: jh7110-usb: Fix link configuration to controller
config: microblaze-randconfig-r072-20240810 (https://download.01.org/0day-ci/archive/20240811/202408110917.hE9xidPH-lkp@intel.com/config)
compiler: microblaze-linux-gcc (GCC) 14.1.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
| Closes: https://lore.kernel.org/r/202408110917.hE9xidPH-lkp@intel.com/

smatch warnings:
drivers/phy/starfive/phy-jh7110-usb.c:148 jh7110_usb_phy_probe() warn: passing zero to 'PTR_ERR'

vim +/PTR_ERR +148 drivers/phy/starfive/phy-jh7110-usb.c

16d3a71c20cf2e Minda Chen 2023-06-29  109  static int jh7110_usb_phy_probe(struct platform_device *pdev)
16d3a71c20cf2e Minda Chen 2023-06-29  110  {
16d3a71c20cf2e Minda Chen 2023-06-29  111  	struct jh7110_usb2_phy *phy;
16d3a71c20cf2e Minda Chen 2023-06-29  112  	struct device *dev = &pdev->dev;
16d3a71c20cf2e Minda Chen 2023-06-29  113  	struct phy_provider *phy_provider;
0ed73d833230fd Jan Kiszka 2024-07-31  114  	u32 args[1];
16d3a71c20cf2e Minda Chen 2023-06-29  115  
16d3a71c20cf2e Minda Chen 2023-06-29  116  	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
16d3a71c20cf2e Minda Chen 2023-06-29  117  	if (!phy)
16d3a71c20cf2e Minda Chen 2023-06-29  118  		return -ENOMEM;
16d3a71c20cf2e Minda Chen 2023-06-29  119  
16d3a71c20cf2e Minda Chen 2023-06-29  120  	phy->usb_125m_clk = devm_clk_get(dev, "125m");
16d3a71c20cf2e Minda Chen 2023-06-29  121  	if (IS_ERR(phy->usb_125m_clk))
16d3a71c20cf2e Minda Chen 2023-06-29  122  		return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk),
16d3a71c20cf2e Minda Chen 2023-06-29  123  			"Failed to get 125m clock\n");
16d3a71c20cf2e Minda Chen 2023-06-29  124  
16d3a71c20cf2e Minda Chen 2023-06-29  125  	phy->app_125m = devm_clk_get(dev, "app_125m");
16d3a71c20cf2e Minda Chen 2023-06-29  126  	if (IS_ERR(phy->app_125m))
16d3a71c20cf2e Minda Chen 2023-06-29  127  		return dev_err_probe(dev, PTR_ERR(phy->app_125m),
16d3a71c20cf2e Minda Chen 2023-06-29  128  			"Failed to get app 125m clock\n");
16d3a71c20cf2e Minda Chen 2023-06-29  129  
16d3a71c20cf2e Minda Chen 2023-06-29  130  	phy->regs = devm_platform_ioremap_resource(pdev, 0);
16d3a71c20cf2e Minda Chen 2023-06-29  131  	if (IS_ERR(phy->regs))
16d3a71c20cf2e Minda Chen 2023-06-29  132  		return dev_err_probe(dev, PTR_ERR(phy->regs),
16d3a71c20cf2e Minda Chen 2023-06-29  133  			"Failed to map phy base\n");
16d3a71c20cf2e Minda Chen 2023-06-29  134  
16d3a71c20cf2e Minda Chen 2023-06-29  135  	phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops);
16d3a71c20cf2e Minda Chen 2023-06-29  136  	if (IS_ERR(phy->phy))
16d3a71c20cf2e Minda Chen 2023-06-29  137  		return dev_err_probe(dev, PTR_ERR(phy->phy),
16d3a71c20cf2e Minda Chen 2023-06-29  138  			"Failed to create phy\n");
16d3a71c20cf2e Minda Chen 2023-06-29  139  
16d3a71c20cf2e Minda Chen 2023-06-29  140  	phy_set_drvdata(phy->phy, phy);
16d3a71c20cf2e Minda Chen 2023-06-29  141  	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
16d3a71c20cf2e Minda Chen 2023-06-29  142  
0ed73d833230fd Jan Kiszka 2024-07-31  143  	phy->sys_syscon =
0ed73d833230fd Jan Kiszka 2024-07-31  144  		syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node,
0ed73d833230fd Jan Kiszka 2024-07-31  145  						     "starfive,sys-syscon",
0ed73d833230fd Jan Kiszka 2024-07-31  146  						     1, args);
0ed73d833230fd Jan Kiszka 2024-07-31  147  	if (IS_ERR(phy->sys_syscon))
0ed73d833230fd Jan Kiszka 2024-07-31 @148  		return dev_err_probe(dev, PTR_ERR(phy->phy),

Passing the wrong variable.  It should be phy->sys_syscon instead of phy->phy.

0ed73d833230fd Jan Kiszka 2024-07-31  149  			"Failed to get sys-syscon\n");
0ed73d833230fd Jan Kiszka 2024-07-31  150  	phy->sys_phy_connect = args[0];
0ed73d833230fd Jan Kiszka 2024-07-31  151  
16d3a71c20cf2e Minda Chen 2023-06-29  152  	return PTR_ERR_OR_ZERO(phy_provider);
16d3a71c20cf2e Minda Chen 2023-06-29  153  }

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki