linux-kernel - Re: [EXT] Re: [PATCH v2 2/5] media: nxp: imx8-isi: Simplify code by using helper macro

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Message-ID: <20251102231440.GA1933@pendragon.ideasonboard.com>
Date: Mon, 3 Nov 2025 01:14:40 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: "G.N. Zhou" <guoniu.zhou@....com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, Frank Li <frank.li@....com>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [EXT] Re: [PATCH v2 2/5] media: nxp: imx8-isi: Simplify code by
 using helper macro

On Mon, Sep 22, 2025 at 02:03:44AM +0000, G.N. Zhou wrote:
> On Monday, September 22, 2025 6:13 AM, Laurent Pinchart wrote:
> > On Fri, Sep 05, 2025 at 02:55:59PM +0800, Guoniu Zhou wrote:
> > > Simplify code by using helper macro FIELD_PREP() and GENMASK().
> > 
> > I'm not necessarily against this change, but how does it "simplify code"
> > ? There's no change in the code beside the macros, and they don't look
> > particularly simpler.
> 
> How about the message body change to " Make code more readable and easier to maintain by
> using the FIELD_PREP and GENMASK(). macro" and title change to "Refine code by using helper macro"?
> If you agree, I could apply it in next version.

No need to send a new version, I'll update the commit message myself.

> > > No functions changed.
> > >
> > > Reviewed-by: Frank Li <Frank.Li@....com>
> > > Signed-off-by: Guoniu Zhou <guoniu.zhou@....com>
> > > ---
> > >  drivers/media/platform/nxp/imx8-isi/imx8-isi-gasket.c | 7 ++++---
> > >  1 file changed, 4 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-gasket.c
> > > b/drivers/media/platform/nxp/imx8-isi/imx8-isi-gasket.c
> > > index
> > >
> > f69c3b5d478209c083738477edf380e3f280c471..2f5e7299b537d612fb1fe668
> > 8c1b
> > > 75bfd2d6049b 100644
> > > --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-gasket.c
> > > +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-gasket.c
> > > @@ -3,6 +3,8 @@
> > >   * Copyright 2019-2023 NXP
> > >   */
> > >
> > > +#include <linux/bitfield.h>
> > > +#include <linux/bits.h>
> > >  #include <linux/regmap.h>
> > >
> > >  #include <media/mipi-csi2.h>
> > > @@ -16,8 +18,7 @@
> > >  #define GASKET_BASE(n)                               (0x0060 + (n) * 0x30)
> > >
> > >  #define GASKET_CTRL                          0x0000
> > > -#define GASKET_CTRL_DATA_TYPE(dt)            ((dt) << 8)
> > > -#define GASKET_CTRL_DATA_TYPE_MASK           (0x3f << 8)
> > > +#define GASKET_CTRL_DATA_TYPE(dt)            FIELD_PREP(GENMASK(13, 8),
> > (dt))
> > 
> > I think you can omit the parentheses around dt here, and around x below.
> 
> Ok, will apply in next version.
> 
> > 
> > >  #define GASKET_CTRL_DUAL_COMP_ENABLE         BIT(1)
> > >  #define GASKET_CTRL_ENABLE                   BIT(0)
> > >
> > > @@ -58,7 +59,7 @@ const struct mxc_gasket_ops mxc_imx8_gasket_ops = {
> > >   */
> > >
> > >  #define DISP_MIX_CAMERA_MUX                     0x30
> > > -#define DISP_MIX_CAMERA_MUX_DATA_TYPE(x)        (((x) & 0x3f) << 3)
> > > +#define DISP_MIX_CAMERA_MUX_DATA_TYPE(x)
> > FIELD_PREP(GENMASK(8, 3), (x))
> > >  #define DISP_MIX_CAMERA_MUX_GASKET_ENABLE       BIT(16)
> > >
> > >  static void mxc_imx93_gasket_enable(struct mxc_isi_dev *isi,

-- 
Regards,

Laurent Pinchart