linux-kernel - Re: [PATCH 1/2] media: nxp: imx8-isi: Factor out a variable

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Date: Sun, 28 Jan 2024 19:13:32 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>, linux-media@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: nxp: imx8-isi: Factor out a variable

Hi Ricardo,

Thank you for the patch.

On Sun, Jan 28, 2024 at 04:13:56PM +0000, Ricardo Ribalda wrote:
> gcc-11 seems to believe that coffs can be used uninitialized. Refactor

s/coffs/coeffs/

> the code and remove the csen variable to convince gcc that we are doing

s/csen/cscen/

> a good job.
> 
> drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c:218:20: warning: 'coeffs' may be used uninitialized in this function [-Wmaybe-uninitialized]
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
> index 19e80b95ffea..5623914f95e6 100644
> --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
> +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
> @@ -215,8 +215,7 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
>  		[MXC_ISI_ENC_RGB] = "RGB",
>  		[MXC_ISI_ENC_YUV] = "YUV",
>  	};
> -	const u32 *coeffs;
> -	bool cscen = true;
> +	const u32 *coeffs = NULL;
>  	u32 val;
>  
>  	val = mxc_isi_read(pipe, CHNL_IMG_CTRL);
> @@ -235,14 +234,13 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
>  		val |= CHNL_IMG_CTRL_CSC_MODE(CHNL_IMG_CTRL_CSC_MODE_RGB2YCBCR);
>  	} else {
>  		/* Bypass CSC */
> -		cscen = false;
>  		val |= CHNL_IMG_CTRL_CSC_BYPASS;
>  	}
>  
>  	dev_dbg(pipe->isi->dev, "CSC: %s -> %s\n",
>  		encodings[in_encoding], encodings[out_encoding]);
>  
> -	if (cscen) {
> +	if (coeffs) {
>  		mxc_isi_write(pipe, CHNL_CSC_COEFF0, coeffs[0]);
>  		mxc_isi_write(pipe, CHNL_CSC_COEFF1, coeffs[1]);
>  		mxc_isi_write(pipe, CHNL_CSC_COEFF2, coeffs[2]);
> @@ -253,7 +251,7 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
>  
>  	mxc_isi_write(pipe, CHNL_IMG_CTRL, val);
>  
> -	*bypass = !cscen;
> +	*bypass = !coeffs;
>  }
>  
>  void mxc_isi_channel_set_alpha(struct mxc_isi_pipe *pipe, u8 alpha)
> 

-- 
Regards,

Laurent Pinchart