linux-kernel - Re: [PATCH v2 05/16] usb: dwc3: add quirks support to be compatible for kinds of SoCs

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Date:	Fri, 17 Oct 2014 09:41:44 -0500
From:	Felipe Balbi <balbi@...com>
To:	Huang Rui <ray.huang@....com>
CC:	Felipe Balbi <balbi@...com>,
	Alan Stern <stern@...land.harvard.edu>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paul Zimmerman <Paul.Zimmerman@...opsys.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Vincent Wan <vincent.wan@....com>, Tony Li <tony.li@....com>,
	<linux-usb@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 05/16] usb: dwc3: add quirks support to be compatible
 for kinds of SoCs

HI,

On Fri, Oct 17, 2014 at 04:53:30PM +0800, Huang Rui wrote:
> This patch adds a quirks flag at dwc3 structure, and SoCs platform vendor is
> able to define this flag in platform data at bus glue layer. Then do some
> independent behaviors at dwc3 core level.
> 
> Signed-off-by: Huang Rui <ray.huang@....com>
> ---
>  drivers/usb/dwc3/core.c          | 2 ++
>  drivers/usb/dwc3/core.h          | 3 +++
>  drivers/usb/dwc3/dwc3-pci.c      | 9 +++++++++
>  drivers/usb/dwc3/platform_data.h | 2 ++
>  4 files changed, 16 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index ddac372..50c0eae 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -710,6 +710,8 @@ static int dwc3_probe(struct platform_device *pdev)
>  
>  		dwc->needs_fifo_resize = pdata->tx_fifo_resize;
>  		dwc->dr_mode = pdata->dr_mode;
> +
> +		dwc->quirks = pdata->quirks;
>  	}
>  
>  	/* default to superspeed if no maximum_speed passed */
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index f6ee623..cfe0d57 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -636,6 +636,7 @@ struct dwc3_scratchpad_array {
>   * @u1u2: only used on revisions <1.83a for workaround
>   * @maximum_speed: maximum speed requested (mainly for testing purposes)
>   * @revision: revision register contents
> + * @quirks: represents different SOCs hardware work-arounds and quirks
>   * @dr_mode: requested mode of operation
>   * @usb2_phy: pointer to USB2 PHY
>   * @usb3_phy: pointer to USB3 PHY
> @@ -740,6 +741,8 @@ struct dwc3 {
>  #define DWC3_REVISION_270A	0x5533270a
>  #define DWC3_REVISION_280A	0x5533280a
>  
> +	u32			quirks;
> +
>  	enum dwc3_ep0_next	ep0_next_event;
>  	enum dwc3_ep0_state	ep0state;
>  	enum dwc3_link_state	link_state;
> diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
> index 3806547..18569a4 100644
> --- a/drivers/usb/dwc3/dwc3-pci.c
> +++ b/drivers/usb/dwc3/dwc3-pci.c
> @@ -25,6 +25,8 @@
>  #include <linux/usb/otg.h>
>  #include <linux/usb/usb_phy_generic.h>
>  
> +#include "platform_data.h"
> +
>  /* FIXME define these in <linux/pci_ids.h> */
>  #define PCI_VENDOR_ID_SYNOPSYS		0x16c3
>  #define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3	0xabcd
> @@ -103,6 +105,9 @@ static int dwc3_pci_probe(struct pci_dev *pci,
>  	struct dwc3_pci		*glue;
>  	int			ret;
>  	struct device		*dev = &pci->dev;
> +	struct dwc3_platform_data dwc3_pdata;
> +
> +	memset(&dwc3_pdata, 0x00, sizeof(dwc3_pdata));
>  
>  	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
>  	if (!glue)
> @@ -149,6 +154,10 @@ static int dwc3_pci_probe(struct pci_dev *pci,
>  
>  	pci_set_drvdata(pci, glue);
>  
> +	ret = platform_device_add_data(dwc3, &dwc3_pdata, sizeof(dwc3_pdata));
> +	if (ret)
> +		goto err3;
> +
>  	dma_set_coherent_mask(&dwc3->dev, dev->coherent_dma_mask);
>  
>  	dwc3->dev.dma_mask = dev->dma_mask;
> diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
> index 7db34f0..1d3d65f 100644
> --- a/drivers/usb/dwc3/platform_data.h
> +++ b/drivers/usb/dwc3/platform_data.h
> @@ -24,4 +24,6 @@ struct dwc3_platform_data {
>  	enum usb_device_speed maximum_speed;
>  	enum usb_dr_mode dr_mode;
>  	bool tx_fifo_resize;
> +
> +	u32     quirks;

I prefer to have one-bit fields like we already have for delayed_status,
ep0_bounced, ep0_expect_in, and so on. That makes it easier to support
the same quirks through devicetree as well.

-- 
balbi

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