linux-kernel - Re: [PATCH] phy: mvebu-cp110-utmi: support swapping d+/d- lanes by dts property

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Message-ID: <ae576164-f60d-4048-96aa-4f21117f5f4d@solid-run.com>
Date: Tue, 3 Sep 2024 08:04:48 +0000
From: Josua Mayer <josua@...id-run.com>
To: Vinod Koul <vkoul@...nel.org>
CC: Kishon Vijay Abraham I <kishon@...nel.org>,
	"linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: mvebu-cp110-utmi: support swapping d+/d- lanes by
 dts property

Hi Vinod,

Thank you for looking at my patch!

Am 04.08.24 um 20:48 schrieb Vinod Koul:
> On 04-07-24, 16:57, Josua Mayer wrote:
>> CP11x UTMI PHY supports swapping D+/D- signals via digital control
>> register 1.
>>
>> Add support for the "swap-dx-lanes" device-tree property, which lists
>> the port-ids that should swap D+ and D-.
>> The property is evaluated in probe and applied before power-on
>> during mvebu_cp110_utmi_port_setup.
> It fails my build tests
I will rebase on v6.11-rc1, compile-test and then submit a new version.
>
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:
> In function ‘mvebu_cp110_utmi_phy_probe’:
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:361:89:
> error: macro "of_property_for_each_u32" passed 5 arguments, but takes
> just 3
>    361 |                 of_property_for_each_u32(dev->of_node,
> "swap-dx-lanes", prop, p, swap_dx)
>        |
> ^
> In file included from
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:15:
> include/linux/of.h:1432: note:
> macro "of_property_for_each_u32" defined here
>   1432 | #define of_property_for_each_u32(np, propname, u)
> \
>        |
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:361:17:
> error: ‘of_property_for_each_u32’ undeclared (first use in this
> function); did you mean ‘of_property_read_u32’?
>    361 |                 of_property_for_each_u32(dev->of_node,
> "swap-dx-lanes", prop, p, swap_dx)
>        |                 ^~~~~~~~~~~~~~~~~~~~~~~~
>        |                 of_property_read_u32
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:361:17:
> note: each undeclared identifier is reported only once for each function
> it appears in
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:361:41:
> error: expected ‘;’ before ‘if’
>    361 |                 of_property_for_each_u32(dev->of_node,
> "swap-dx-lanes", prop, p, swap_dx)
>        |                                         ^
>        |                                         ;
>    362 |                         if (swap_dx == port_id)
>        |                         ~~
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:301:13:
> error: unused variable ‘swap_dx’ [-Werror=unused-variable]
>    301 |         u32 swap_dx = 0;
>        |             ^~~~~~~
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:299:23:
> error: unused variable ‘p’ [-Werror=unused-variable]
>    299 |         const __be32 *p;
>        |                       ^
> drivers/phy/marvell/phy-mvebu-cp110-utmi.c:298:26:
> error: unused variable ‘prop’ [-Werror=unused-variable]
>    298 |         struct property *prop;
>        |                          ^~~~
> cc1: all warnings being treated as errors
>
>
>> Signed-off-by: Josua Mayer <josua@...id-run.com>
>> ---
>>   drivers/phy/marvell/phy-mvebu-cp110-utmi.c | 17 +++++++++++++++++
>>   1 file changed, 17 insertions(+)
>>
>> diff --git a/drivers/phy/marvell/phy-mvebu-cp110-utmi.c b/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
>> index 4922a5f3327d..5e403f842e9a 100644
>> --- a/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
>> +++ b/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
>> @@ -62,6 +62,8 @@
>>   #define   SQ_AMP_CAL_MASK			GENMASK(2, 0)
>>   #define   SQ_AMP_CAL_VAL			1
>>   #define   SQ_AMP_CAL_EN				BIT(3)
>> +#define UTMI_DIG_CTRL1_REG			0x20
>> +#define   SWAP_DPDM				BIT(15)
>>   #define UTMI_CTRL_STATUS0_REG			0x24
>>   #define   SUSPENDM				BIT(22)
>>   #define   TEST_SEL				BIT(25)
>> @@ -104,6 +106,7 @@ struct mvebu_cp110_utmi_port {
>>   	struct mvebu_cp110_utmi *priv;
>>   	u32 id;
>>   	enum usb_dr_mode dr_mode;
>> +	bool swap_dx;
>>   };
>>   
>>   static void mvebu_cp110_utmi_port_setup(struct mvebu_cp110_utmi_port *port)
>> @@ -159,6 +162,13 @@ static void mvebu_cp110_utmi_port_setup(struct mvebu_cp110_utmi_port *port)
>>   	reg &= ~(VDAT_MASK | VSRC_MASK);
>>   	reg |= (VDAT_VAL << VDAT_OFFSET) | (VSRC_VAL << VSRC_OFFSET);
>>   	writel(reg, PORT_REGS(port) + UTMI_CHGDTC_CTRL_REG);
>> +
>> +	/* Swap D+/D- */
>> +	reg = readl(PORT_REGS(port) + UTMI_DIG_CTRL1_REG);
>> +	reg &= ~(SWAP_DPDM);
>> +	if (port->swap_dx)
>> +		reg |= SWAP_DPDM;
>> +	writel(reg, PORT_REGS(port) + UTMI_DIG_CTRL1_REG);
>>   }
>>   
>>   static int mvebu_cp110_utmi_phy_power_off(struct phy *phy)
>> @@ -285,7 +295,10 @@ static int mvebu_cp110_utmi_phy_probe(struct platform_device *pdev)
>>   	struct mvebu_cp110_utmi *utmi;
>>   	struct phy_provider *provider;
>>   	struct device_node *child;
>> +	struct property *prop;
>> +	const __be32 *p;
>>   	u32 usb_devices = 0;
>> +	u32 swap_dx = 0;
>>   
>>   	utmi = devm_kzalloc(dev, sizeof(*utmi), GFP_KERNEL);
>>   	if (!utmi)
>> @@ -345,6 +358,10 @@ static int mvebu_cp110_utmi_phy_probe(struct platform_device *pdev)
>>   			}
>>   		}
>>   
>> +		of_property_for_each_u32(dev->of_node, "swap-dx-lanes", prop, p, swap_dx)
>> +			if (swap_dx == port_id)
>> +				port->swap_dx = 1;
>> +
>>   		/* Retrieve PHY capabilities */
>>   		utmi->ops = &mvebu_cp110_utmi_phy_ops;
>>   
>>
>> ---
>> base-commit: 4de480264948cbf2b08a72c39ee122a9f9761e03
>> change-id: 20240704-mvebu-utmi-phy-84aa3bf3957d
>>
>> Sincerely,
>> -- 
>> Josua Mayer <josua@...id-run.com>