linux-kernel - Re: [PATCH v6 2/4] media: stm32-dcmi: trace the supported fourcc/mbus

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Message-ID: <20190819072621.GZ6133@paasikivi.fi.intel.com>
Date:   Mon, 19 Aug 2019 10:26:21 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Hugues FRUCHET <hugues.fruchet@...com>
Cc:     Alexandre TORGUE <alexandre.torgue@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Yannick FERTRE <yannick.fertre@...com>,
        Philippe CORNU <philippe.cornu@...com>,
        Mickael GUENE <mickael.guene@...com>
Subject: Re: [PATCH v6 2/4] media: stm32-dcmi: trace the supported
 fourcc/mbus_code

Hi Hugues,

On Mon, Aug 19, 2019 at 07:23:17AM +0000, Hugues FRUCHET wrote:
> Hi Sakari,
> 
> On 8/16/19 10:15 AM, Sakari Ailus wrote:
> > Hi Hugues,
> > 
> > On Wed, Aug 14, 2019 at 03:48:51PM +0200, Hugues Fruchet wrote:
> >> Add a trace of the set of supported fourcc/mbus_code which
> >> intersect between DCMI and source sub-device.
> >>
> >> Signed-off-by: Hugues Fruchet <hugues.fruchet@...com>
> >> ---
> >>   drivers/media/platform/stm32/stm32-dcmi.c | 12 ++++++++++--
> >>   1 file changed, 10 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
> >> index b462f71..18acecf 100644
> >> --- a/drivers/media/platform/stm32/stm32-dcmi.c
> >> +++ b/drivers/media/platform/stm32/stm32-dcmi.c
> >> @@ -1447,12 +1447,20 @@ static int dcmi_formats_init(struct stm32_dcmi *dcmi)
> >>   			/* Code supported, have we got this fourcc yet? */
> >>   			for (j = 0; j < num_fmts; j++)
> >>   				if (sd_fmts[j]->fourcc ==
> >> -						dcmi_formats[i].fourcc)
> >> +						dcmi_formats[i].fourcc) {
> >>   					/* Already available */
> >> +					dev_dbg(dcmi->dev, "Skipping fourcc/code: %4.4s/0x%x\n",
> >> +						(char *)&sd_fmts[j]->fourcc,
> >> +						mbus_code.code);
> >>   					break;
> >> -			if (j == num_fmts)
> >> +				}
> >> +			if (j == num_fmts) {
> >>   				/* New */
> >>   				sd_fmts[num_fmts++] = dcmi_formats + i;
> >> +				dev_dbg(dcmi->dev, "Supported fourcc/code: %4.4s/0x%x\n",
> > 
> > Over 80 characters per line.
> > 
> 
> This an exception of the "80 chars" in order to be able to grep in 
> kernel messages:
> https://www.kernel.org/doc/html/v4.10/process/coding-style.html
> "However, never break user-visible strings such as printk messages, 
> because that breaks the ability to grep for them."
> 
> This exception is managed in checkpatch.pl (--strict).

This exception is for cases where wrapping the line in the usual way, e.g.
at argument boundaries, does not prevent it exceeding 80 characters. But it is
not the case here.

-- 
Sakari Ailus
sakari.ailus@...ux.intel.com