linux-kernel - [PATCH v3 10/15] media: stm32: dcmipp: avoid duplicated format on enum in bytecap

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Message-ID: <20241118-csi_dcmipp_mp25-v3-10-c1914afb0a0f@foss.st.com>
Date: Mon, 18 Nov 2024 14:35:33 +0100
From: Alain Volmat <alain.volmat@...s.st.com>
To: Hugues Fruchet <hugues.fruchet@...s.st.com>,
        Mauro Carvalho Chehab
	<mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre
 Torgue <alexandre.torgue@...s.st.com>,
        Hans Verkuil
	<hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Rob
 Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor
 Dooley <conor+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC: <linux-media@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Alain Volmat <alain.volmat@...s.st.com>
Subject: [PATCH v3 10/15] media: stm32: dcmipp: avoid duplicated format on
 enum in bytecap

Avoid duplication of enumerated pixelformat on the bytecap
video capture device.  Indeed, since the bytecap format list
contains both CSI & parallel 16bits formats, ensure that same
pixelformat are not reported twice when performing enumeration
of supported formats.

Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
---
 .../st/stm32/stm32-dcmipp/dcmipp-bytecap.c         | 42 +++++++++++-----------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c
index 99732d19dc4d5f4692588118eadb236d4ed9c8a1..8f5f69a3afc413b49d82303cd4d98da15f62e34d 100644
--- a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c
+++ b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c
@@ -268,34 +268,34 @@ static int dcmipp_bytecap_enum_fmt_vid_cap(struct file *file, void *priv,
 {
 	const struct dcmipp_bytecap_pix_map *vpix;
 	unsigned int index = f->index;
-	unsigned int i;
+	unsigned int i, prev_pixelformat = 0;
 
-	if (f->mbus_code) {
-		/*
-		 * If a media bus code is specified, only enumerate formats
-		 * compatible with it.
-		 */
-		for (i = 0; i < ARRAY_SIZE(dcmipp_bytecap_pix_map_list); i++) {
-			vpix = &dcmipp_bytecap_pix_map_list[i];
-			if (vpix->code != f->mbus_code)
-				continue;
+	/*
+	 * List up all formats (or only ones matching f->mbus_code), taking
+	 * care of removing duplicated entries (due to support of both
+	 * parallel & csi 16 bits formats
+	 */
+	for (i = 0; i < ARRAY_SIZE(dcmipp_bytecap_pix_map_list); i++) {
+		vpix = &dcmipp_bytecap_pix_map_list[i];
+		/* Skip formats not matching requested mbus code */
+		if (f->mbus_code && vpix->code != f->mbus_code)
+			continue;
 
-			if (index == 0)
-				break;
+		/* Skip duplicated pixelformat */
+		if (vpix->pixelformat == prev_pixelformat)
+			continue;
 
-			index--;
-		}
+		prev_pixelformat = vpix->pixelformat;
 
-		if (i == ARRAY_SIZE(dcmipp_bytecap_pix_map_list))
-			return -EINVAL;
-	} else {
-		/* Otherwise, enumerate all formats. */
-		if (f->index >= ARRAY_SIZE(dcmipp_bytecap_pix_map_list))
-			return -EINVAL;
+		if (index == 0)
+			break;
 
-		vpix = &dcmipp_bytecap_pix_map_list[f->index];
+		index--;
 	}
 
+	if (i == ARRAY_SIZE(dcmipp_bytecap_pix_map_list))
+		return -EINVAL;
+
 	f->pixelformat = vpix->pixelformat;
 
 	return 0;

-- 
2.25.1