linux-kernel - Re: [PATCH v9 0/5] Re-introduce TX FIFO resize for larger EP bursting

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Date:   Mon, 7 Jun 2021 09:04:38 -0700
From:   Jack Pham <jackp@...eaurora.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Wesley Cheng <wcheng@...eaurora.org>, balbi@...nel.org,
        agross@...nel.org, bjorn.andersson@...aro.org, robh+dt@...nel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Thinh.Nguyen@...opsys.com
Subject: Re: [PATCH v9 0/5] Re-introduce TX FIFO resize for larger EP bursting

Hey Wesley,

On Fri, Jun 04, 2021 at 01:54:48PM +0200, Greg KH wrote:
> On Wed, May 19, 2021 at 12:49:16AM -0700, Wesley Cheng wrote:
> > Changes in V9:
> >  - Fixed incorrect patch in series.  Removed changes in DTSI, as dwc3-qcom will
> >    add the property by default from the kernel.
> 
> This patch series has one build failure and one warning added:
> 
> drivers/usb/dwc3/gadget.c: In function ‘dwc3_gadget_calc_tx_fifo_size’:
> drivers/usb/dwc3/gadget.c:653:45: warning: passing argument 1 of ‘dwc3_mdwidth’ makes pointer from integer without a cast [-Wint-conversion]
>   653 |         mdwidth = dwc3_mdwidth(dwc->hwparams.hwparams0);
>       |                                ~~~~~~~~~~~~~^~~~~~~~~~
>       |                                             |
>       |                                             u32 {aka unsigned int}
> In file included from drivers/usb/dwc3/debug.h:14,
>                  from drivers/usb/dwc3/gadget.c:25:
> drivers/usb/dwc3/core.h:1493:45: note: expected ‘struct dwc3 *’ but argument is of type ‘u32’ {aka ‘unsigned int’}
>  1493 | static inline u32 dwc3_mdwidth(struct dwc3 *dwc)
>       |                                ~~~~~~~~~~~~~^~~

I'm guessing you were previously using the DWC3_MDWIDTH macro which
operated on the 'hwparams0' reg value directly, but probably had to
switch it to the dwc3_mdwidth() inline function that Thinh had replaced
it with recently. Forgot to compile-test I bet? :)

> drivers/usb/dwc3/dwc3-qcom.c: In function ‘dwc3_qcom_of_register_core’:
> drivers/usb/dwc3/dwc3-qcom.c:660:23: error: implicit declaration of function ‘of_add_property’; did you mean ‘of_get_property’? [-Werror=implicit-function-declaration]
>   660 |                 ret = of_add_property(dwc3_np, prop);
>       |                       ^~~~~~~~~~~~~~~
>       |                       of_get_property

Scratched my head on this one a bit, since 'of_add_property' is clearly
declared in <linux/of.h> which dwc3-qcom.c directly includes. Then I
looked closer and saw the declaration only in case of #ifdef CONFIG_OF
and noticed it doesn't have a corresponding no-op static inline
definition in the case of !CONFIG_OF. Again I'm guessing here that Greg
must have built on a non-OF config.  We should probably include a patch
that adds the stub.

Thanks,
Jack
-- 
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