linux-kernel - [PATCH] media: camss: vfe: simplify vfe_get_wm

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Date:   Wed, 18 Aug 2021 12:41:05 -0700
From:   trix@...hat.com
To:     robert.foss@...aro.org, todor.too@...il.com, agross@...nel.org,
        bjorn.andersson@...aro.org, mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH] media: camss: vfe: simplify vfe_get_wm_sizes()

From: Tom Rix <trix@...hat.com>

Static analysis reports this representative problem
camss-vfe-4-1.c:333: The result of the left shift is undefined because
  the left operand is negative
  reg |= (height - 1) << 4;
~~~~~~~~~ ^

The is a false positive.  height is set in vfe_get_wm_sizes() which
has a switch statement without a default.

Reviewing the switch, the cases contain redundant assignments.
So simplify to assignments.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 .../media/platform/qcom/camss/camss-vfe-4-1.c | 20 ++++++-------------
 .../media/platform/qcom/camss/camss-vfe-4-7.c | 10 +++-------
 .../media/platform/qcom/camss/camss-vfe-4-8.c |  9 +++------
 3 files changed, 12 insertions(+), 27 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
index 7b7c9a0aaab282..42047b11ba529e 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
@@ -290,22 +290,14 @@ static void vfe_wm_frame_based(struct vfe_device *vfe, u8 wm, u8 enable)
 static void vfe_get_wm_sizes(struct v4l2_pix_format_mplane *pix, u8 plane,
 			     u16 *width, u16 *height, u16 *bytesperline)
 {
-	switch (pix->pixelformat) {
-	case V4L2_PIX_FMT_NV12:
-	case V4L2_PIX_FMT_NV21:
-		*width = pix->width;
-		*height = pix->height;
-		*bytesperline = pix->plane_fmt[0].bytesperline;
+	*width = pix->width;
+	*height = pix->height;
+	*bytesperline = pix->plane_fmt[0].bytesperline;
+
+	if (pix->pixelformat == V4L2_PIX_FMT_NV12 ||
+	    pix->pixelformat == V4L2_PIX_FMT_NV21)
 		if (plane == 1)
 			*height /= 2;
-		break;
-	case V4L2_PIX_FMT_NV16:
-	case V4L2_PIX_FMT_NV61:
-		*width = pix->width;
-		*height = pix->height;
-		*bytesperline = pix->plane_fmt[0].bytesperline;
-		break;
-	}
 }
 
 static void vfe_wm_line_based(struct vfe_device *vfe, u32 wm,
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
index 2836b12ec98915..ab2d57bdf5e71c 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
@@ -370,30 +370,26 @@ static int vfe_word_per_line_by_bytes(u32 bytes_per_line)
 static void vfe_get_wm_sizes(struct v4l2_pix_format_mplane *pix, u8 plane,
 			     u16 *width, u16 *height, u16 *bytesperline)
 {
+	*width = pix->width;
+	*height = pix->height;
+
 	switch (pix->pixelformat) {
 	case V4L2_PIX_FMT_NV12:
 	case V4L2_PIX_FMT_NV21:
-		*width = pix->width;
-		*height = pix->height;
 		*bytesperline = pix->plane_fmt[0].bytesperline;
 		if (plane == 1)
 			*height /= 2;
 		break;
 	case V4L2_PIX_FMT_NV16:
 	case V4L2_PIX_FMT_NV61:
-		*width = pix->width;
-		*height = pix->height;
 		*bytesperline = pix->plane_fmt[0].bytesperline;
 		break;
 	case V4L2_PIX_FMT_YUYV:
 	case V4L2_PIX_FMT_YVYU:
 	case V4L2_PIX_FMT_VYUY:
 	case V4L2_PIX_FMT_UYVY:
-		*width = pix->width;
-		*height = pix->height;
 		*bytesperline = pix->plane_fmt[plane].bytesperline;
 		break;
-
 	}
 }
 
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-8.c b/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
index 19519234f727c1..7e6b62c930ac8a 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
@@ -343,27 +343,24 @@ static int vfe_word_per_line_by_bytes(u32 bytes_per_line)
 static void vfe_get_wm_sizes(struct v4l2_pix_format_mplane *pix, u8 plane,
 			     u16 *width, u16 *height, u16 *bytesperline)
 {
+	*width = pix->width;
+	*height = pix->height;
+
 	switch (pix->pixelformat) {
 	case V4L2_PIX_FMT_NV12:
 	case V4L2_PIX_FMT_NV21:
-		*width = pix->width;
-		*height = pix->height;
 		*bytesperline = pix->plane_fmt[0].bytesperline;
 		if (plane == 1)
 			*height /= 2;
 		break;
 	case V4L2_PIX_FMT_NV16:
 	case V4L2_PIX_FMT_NV61:
-		*width = pix->width;
-		*height = pix->height;
 		*bytesperline = pix->plane_fmt[0].bytesperline;
 		break;
 	case V4L2_PIX_FMT_YUYV:
 	case V4L2_PIX_FMT_YVYU:
 	case V4L2_PIX_FMT_VYUY:
 	case V4L2_PIX_FMT_UYVY:
-		*width = pix->width;
-		*height = pix->height;
 		*bytesperline = pix->plane_fmt[plane].bytesperline;
 		break;
 	}
-- 
2.26.3