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Date:   Fri, 3 Jul 2020 09:43:53 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Cc:     Lee Jones <lee.jones@linaro.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        Ben Dooks <ben@simtec.co.uk>
Subject: Re: [PATCH 11/30] usb: dwc2: gadget: Avoid pointless read of EP
 control register
Message-ID: <20200703074353.GA2391671@kroah.com>
References: <20200702144625.2533530-1-lee.jones@linaro.org>
 <20200702144625.2533530-12-lee.jones@linaro.org>
 <20200703072926.GA2322133@kroah.com>
 <e88abd64-4acf-31f6-f76a-5a333df3d46a@synopsys.com>
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On Fri, Jul 03, 2020 at 07:38:16AM +0000, Minas Harutyunyan wrote:
> Hi,
> 
> On 7/3/2020 11:29 AM, Greg KH wrote:
> > On Thu, Jul 02, 2020 at 03:46:06PM +0100, Lee Jones wrote:
> >> Commit ec1f9d9f01384 ("usb: dwc2: gadget: parity fix in isochronous mode") moved
> >> these checks to dwc2_hsotg_change_ep_iso_parity() back in 2015.  The assigned
> >> value hasn't been read back since.  Let's remove the unnecessary H/W read.
> >>
> >> Fixes the following W=1 warning:
> >>
> >>   drivers/usb/dwc2/gadget.c: In function ‘dwc2_hsotg_epint’:
> >>   drivers/usb/dwc2/gadget.c:2981:6: warning: variable ‘ctrl’ set but not used [-Wunused-but-set-variable]
> >>   2981 | u32 ctrl;
> >>   | ^~~~
> >>
> >> Cc: Minas Harutyunyan <hminas@synopsys.com>
> >> Cc: Ben Dooks <ben@simtec.co.uk>
> >> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> >> ---
> >>   drivers/usb/dwc2/gadget.c | 2 --
> >>   1 file changed, 2 deletions(-)
> >>
> >> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> >> index 116e6175c7a48..fa07e3fcb8841 100644
> >> --- a/drivers/usb/dwc2/gadget.c
> >> +++ b/drivers/usb/dwc2/gadget.c
> >> @@ -2975,10 +2975,8 @@ static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx,
> >>   	u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx);
> >>   	u32 epsiz_reg = dir_in ? DIEPTSIZ(idx) : DOEPTSIZ(idx);
> >>   	u32 ints;
> >> -	u32 ctrl;
> >>   
> >>   	ints = dwc2_gadget_read_ep_interrupts(hsotg, idx, dir_in);
> >> -	ctrl = dwc2_readl(hsotg, epctl_reg);
> > 
> > As you know, lots of hardware requires reads to happen to do things, so
> > are you sure it is safe to remove this read call?
> > 
> 
> Greg, yes, it's Ok to remove this unnecessary read which remained from 
> previous implementations.

Great, thanks for confirming!

greg k-h