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

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Date: Sun, 28 Jan 2024 16:13:56 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 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>
Cc: linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 1/2] media: nxp: imx8-isi: Factor out a variable

gcc-11 seems to believe that coffs can be used uninitialized. Refactor
the code and remove the csen variable to convince gcc that we are doing
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>
---
 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)

-- 
2.43.0.429.g432eaa2c6b-goog