linux-kernel - Re: [PATCH v9 3/5] usb: xhci: Add support for Renesas controller with memory

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Date:   Thu, 23 Apr 2020 20:01:27 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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 v9 3/5] usb: xhci: Add support for Renesas controller
 with memory

On 23-04-20, 17:07, Mathias Nyman wrote:
> On 14.4.2020 19.41, 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 | 33 +++++++++++++++++++++++++++++++++
> >  drivers/usb/host/xhci.h     |  1 +
> >  2 files changed, 34 insertions(+)
> > 
> > diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> > index b6c2f5c530e3..11521e2e1720 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
> > @@ -328,6 +329,21 @@ 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;
> > +
> > +	driver_data = (struct xhci_driver_data *)id->driver_data;
> > +
> > +	if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
> > +		retval = renesas_xhci_pci_probe(dev, id);
> > +		switch (retval) {
> > +		case 0: /* fw check success, continue */
> > +			break;
> > +		case 1: /* fw will be loaded by async load */
> > +			return 0;
> 
> This is no longer true, right?

Correct.

> To me it looks like renesas_xhci_pci_probe() returns 0 on success, both if
> firmware was already running or if successfully loaded, and negative on error

Yes now it does that and I will update this part..
> 
> While changing this the function name "renesas_xhci_pci_probe()" should be
> changed as well. This isn't anymore a separate firmware loading driver, just a
> a lot of renesas firmware loading code.
> 
> You could call renesas_xhci_check_request_fw() directly instead:
> 
> 	if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
> 		retval = renesas_xhci_check_request_fw(dev, id);
> 		if (retval)
> 			return retval;
> 	}

Yes I can remove this layer and directly invoke the internal function..

Thanks for the comments

-- 
~Vinod