linux-kernel - Re: [PATCH v10 3/5] usb: xhci: Add support for Renesas controller with memory

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Message-ID: <79023293-8ad8-751c-b4ca-8393cdbbf4a2@linux.intel.com>
Date:   Wed, 29 Apr 2020 16:53:48 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Christian Lamparter <chunkeey@...glemail.com>,
        John Stultz <john.stultz@...aro.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Andreas Böhler <dev@...ehler.at>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 3/5] usb: xhci: Add support for Renesas controller
 with memory

On 24.4.2020 13.14, Vinod Koul wrote:
> Some rensas controller like uPD720201 and uPD720202 need firmware to be
> loaded. Add these devices in table and invoke renesas firmware loader
> functions to check and load the firmware into device memory when
> required.
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  drivers/usb/host/xhci-pci.c | 28 ++++++++++++++++++++++++++++
>  drivers/usb/host/xhci.h     |  1 +
>  2 files changed, 29 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> index b6c2f5c530e3..f26cf072836d 100644
> --- a/drivers/usb/host/xhci-pci.c
> +++ b/drivers/usb/host/xhci-pci.c
> @@ -15,6 +15,7 @@
>  
>  #include "xhci.h"
>  #include "xhci-trace.h"
> +#include "xhci-pci.h"
>  
>  #define SSIC_PORT_NUM		2
>  #define SSIC_PORT_CFG2		0x880c
> @@ -319,6 +320,8 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
>  	return xhci_pci_reinit(xhci, pdev);
>  }
>  
> +static bool renesas_device;

hmm, we shouldn't need this

> +
>  /*
>   * We need to register our own PCI probe function (instead of the USB core's
>   * function) in order to create a second roothub under xHCI.
> @@ -328,6 +331,16 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  	int retval;
>  	struct xhci_hcd *xhci;
>  	struct usb_hcd *hcd;
> +	struct xhci_driver_data *driver_data;
> +
> +	renesas_device = false;
> +	driver_data = (struct xhci_driver_data *)id->driver_data;
> +	if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
> +		retval = renesas_xhci_check_request_fw(dev, id);
> +		if (retval)
> +			return retval;
> +		renesas_device = true;
> +	}
>  
>  	/* Prevent runtime suspending between USB-2 and USB-3 initialization */
>  	pm_runtime_get_noresume(&dev->dev);
> @@ -388,6 +401,9 @@ static void xhci_pci_remove(struct pci_dev *dev)
>  {
>  	struct xhci_hcd *xhci;
>  
> +	if (renesas_device)
> +		renesas_xhci_pci_exit(dev);
> +

Ah, I see, what we really should do is make sure the quirks in the driver data get
added to xhci->quirks, and then just check for the correct quirk in xhci_pci_remove.

if (xhci->quirks & XHCI_RENESAS_FW_QUIRK)
	renesas_xhci_pci_exit(dev);
 

Heikki Krogerus did some work on this a long time ago, below code is based on his
work. It needs to be added:
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index f26cf072836d..5ae4fc10fc31 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -88,8 +88,16 @@ static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
 
 static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 {
-	struct pci_dev		*pdev = to_pci_dev(dev);
+	struct pci_dev			*pdev = to_pci_dev(dev);
+	struct xhci_driver_data		*driver_data;
+	const struct pci_device_id	*id;
 
+	id = pci_match_id(pdev->driver->id_table, pdev);
+
+	if (id && id->driver_data) {
+		driver_data = (struct xhci_driver_data *)id->driver_data;
+		xhci->quirks |= driver_data->quirks;
+	}
 	/* Look for vendor-specific quirks */
 	if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
 			(pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK ||


-Mathias