linux-kernel - Re: [PATCH 07/18] media: rcar-csi2: Fix typo

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Message-ID: <20250219144658.GA515486@ragnatech.se>
Date: Wed, 19 Feb 2025 15:46:58 +0100
From: Niklas Söderlund <niklas.soderlund@...natech.se>
To: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Jacopo Mondi <jacopo.mondi@...asonboard.com>
Subject: Re: [PATCH 07/18] media: rcar-csi2: Fix typo

On 2025-02-19 16:36:27 +0200, Tomi Valkeinen wrote:
> Hi,
> 
> On 19/02/2025 16:24, Niklas Söderlund wrote:
> > Hi Tomi,
> > 
> > On 2025-02-19 15:49:01 +0200, Tomi Valkeinen wrote:
> > > Fix typo with variable name 'msps'.
> > 
> > FWIW, this is not a typo, C-PHY uses symbols per seconds, not bits per
> > second.
> 
> Hmm, but the code calls rcsi2_calc_mbps() and uses the returned value as
> msps. How can that be right, if it's symbols?

I don't recall all the details off hand, but IIRC it's just a naming 
thing in the specification. I'm fine with using either, just wanted to 
point out it was not a typo but intentional name.

> 
>  Tomi
> 
> > > 
> > > Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@...asonboard.com>
> > > ---
> > >   drivers/media/platform/renesas/rcar-csi2.c | 10 +++++-----
> > >   1 file changed, 5 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/media/platform/renesas/rcar-csi2.c b/drivers/media/platform/renesas/rcar-csi2.c
> > > index 845fb3e155f1..92697ea3df01 100644
> > > --- a/drivers/media/platform/renesas/rcar-csi2.c
> > > +++ b/drivers/media/platform/renesas/rcar-csi2.c
> > > @@ -1301,7 +1301,7 @@ static int rcsi2_start_receiver_v4h(struct rcar_csi2 *priv,
> > >   	const struct rcar_csi2_format *format;
> > >   	const struct v4l2_mbus_framefmt *fmt;
> > >   	unsigned int lanes;
> > > -	int msps;
> > > +	int mbps;
> > >   	int ret;
> > >   	/* Use the format on the sink pad to compute the receiver config. */
> > > @@ -1314,9 +1314,9 @@ static int rcsi2_start_receiver_v4h(struct rcar_csi2 *priv,
> > >   	if (ret)
> > >   		return ret;
> > > -	msps = rcsi2_calc_mbps(priv, format->bpp, lanes);
> > > -	if (msps < 0)
> > > -		return msps;
> > > +	mbps = rcsi2_calc_mbps(priv, format->bpp, lanes);
> > > +	if (mbps < 0)
> > > +		return mbps;
> > >   	/* Reset LINK and PHY*/
> > >   	rcsi2_write(priv, V4H_CSI2_RESETN_REG, 0);
> > > @@ -1352,7 +1352,7 @@ static int rcsi2_start_receiver_v4h(struct rcar_csi2 *priv,
> > >   	rcsi2_write16(priv, V4H_PPI_RW_COMMON_CFG_REG, 0x0003);
> > >   	/* C-PHY settings */
> > > -	ret = rcsi2_c_phy_setting_v4h(priv, msps);
> > > +	ret = rcsi2_c_phy_setting_v4h(priv, mbps);
> > >   	if (ret)
> > >   		return ret;
> > > 
> > > -- 
> > > 2.43.0
> > > 
> > 
> 

-- 
Kind Regards,
Niklas Söderlund