linux-kernel - Re: [PATCH v2] usb: dwc2: add pci_device_id driver

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Date:   Fri, 9 Jun 2023 08:13:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Yinbo Zhu <zhuyinbo@...ngson.cn>
Cc:     Minas Harutyunyan <hminas@...opsys.com>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianmin Lv <lvjianmin@...ngson.cn>, wanghongliang@...ngson.cn,
        Liu Peibao <liupeibao@...ngson.cn>,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v2] usb: dwc2: add pci_device_id driver_data parse support

On Fri, Jun 09, 2023 at 10:50:47AM +0800, Yinbo Zhu wrote:
> The dwc2 driver has everything we need to run in PCI mode except
> for pci_device_id driver_data parse.  With that to set Loongson
> dwc2 element and added identified as PCI_VENDOR_ID_LOONGSON
> and PCI_DEVICE_ID_LOONGSON_DWC2 in dwc2_pci_ids, the Loongson
> dwc2 controller will work.
> 
> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> ---
> Change in v2:
> 		1. Move the dwc2 pci ID from pci_ids.h to params.c.
> 		2. Add some code logic to ensure that the current device is
> 		   a PCI device.
> 		3. Fix the compile issue when dwc2 pci driver as module.
> 
>  drivers/usb/dwc2/core.h   |  1 +
>  drivers/usb/dwc2/params.c | 39 ++++++++++++++++++++++++++++++++++++++-
>  drivers/usb/dwc2/pci.c    | 14 +-------------
>  3 files changed, 40 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
> index 0bb4c0c845bf..c92a1da46a01 100644
> --- a/drivers/usb/dwc2/core.h
> +++ b/drivers/usb/dwc2/core.h
> @@ -1330,6 +1330,7 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev);
>  /* The device ID match table */
>  extern const struct of_device_id dwc2_of_match_table[];
>  extern const struct acpi_device_id dwc2_acpi_match[];
> +extern const struct pci_device_id dwc2_pci_ids[];
>  
>  int dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg);
>  int dwc2_lowlevel_hw_disable(struct dwc2_hsotg *hsotg);
> diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
> index 21d16533bd2f..6b68a8830781 100644
> --- a/drivers/usb/dwc2/params.c
> +++ b/drivers/usb/dwc2/params.c
> @@ -7,9 +7,14 @@
>  #include <linux/module.h>
>  #include <linux/of_device.h>
>  #include <linux/usb/of.h>
> +#include <linux/pci_ids.h>
> +#include <linux/pci.h>
>  
>  #include "core.h"
>  
> +#define PCI_PRODUCT_ID_HAPS_HSOTG	0xabc0
> +#define PCI_DEVICE_ID_LOONGSON_DWC2	0x7a04
> +
>  static void dwc2_set_bcm_params(struct dwc2_hsotg *hsotg)
>  {
>  	struct dwc2_core_params *p = &hsotg->params;
> @@ -55,6 +60,14 @@ static void dwc2_set_jz4775_params(struct dwc2_hsotg *hsotg)
>  		!device_property_read_bool(hsotg->dev, "disable-over-current");
>  }
>  
> +static void dwc2_set_loongson_params(struct dwc2_hsotg *hsotg)
> +{
> +	struct dwc2_core_params *p = &hsotg->params;
> +
> +	p->phy_utmi_width = 8;
> +	p->power_down = DWC2_POWER_DOWN_PARAM_PARTIAL;
> +}
> +
>  static void dwc2_set_x1600_params(struct dwc2_hsotg *hsotg)
>  {
>  	struct dwc2_core_params *p = &hsotg->params;
> @@ -281,6 +294,23 @@ const struct acpi_device_id dwc2_acpi_match[] = {
>  };
>  MODULE_DEVICE_TABLE(acpi, dwc2_acpi_match);
>  
> +const struct pci_device_id dwc2_pci_ids[] = {
> +	{
> +		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS, PCI_PRODUCT_ID_HAPS_HSOTG),
> +	},
> +	{
> +		PCI_DEVICE(PCI_VENDOR_ID_STMICRO,
> +			   PCI_DEVICE_ID_STMICRO_USB_OTG),
> +	},
> +	{
> +		PCI_DEVICE(PCI_VENDOR_ID_LOONGSON, PCI_DEVICE_ID_LOONGSON_DWC2),
> +		.driver_data = (unsigned long)dwc2_set_loongson_params,
> +	},
> +	{ /* end: all zeroes */ }
> +};
> +MODULE_DEVICE_TABLE(pci, dwc2_pci_ids);
> +EXPORT_SYMBOL_GPL(dwc2_pci_ids);
> +
>  static void dwc2_set_param_otg_cap(struct dwc2_hsotg *hsotg)
>  {
>  	switch (hsotg->hw_params.op_mode) {
> @@ -927,13 +957,20 @@ int dwc2_init_params(struct dwc2_hsotg *hsotg)
>  	if (match && match->data) {
>  		set_params = match->data;
>  		set_params(hsotg);
> -	} else {
> +	} else if (!match) {
>  		const struct acpi_device_id *amatch;
> +		const struct pci_device_id *pmatch = NULL;
>  
>  		amatch = acpi_match_device(dwc2_acpi_match, hsotg->dev);
>  		if (amatch && amatch->driver_data) {
>  			set_params = (set_params_cb)amatch->driver_data;
>  			set_params(hsotg);
> +		} else if (!amatch)
> +			pmatch = pci_match_id(dwc2_pci_ids, to_pci_dev(hsotg->dev->parent));

At this point in time, how can you guarantee that the parent device
really is a PCI one?  This function is being called from a platform
device callback, and platform devices should NEVER be a child of a PCI
device, as that's not how PCI or platform devices work.

So how is this even possible?

confused,

greg k-h