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From:   Benoit Parrot <bparrot@ti.com>
To:     Hans Verkuil <hverkuil@xs4all.nl>
CC:     Prabhakar Lad <prabhakar.csengg@gmail.com>,
        <linux-media@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, Benoit Parrot <bparrot@ti.com>
Subject: [Patch 07/13] media: am437x-vpfe: Use a per instance format array instead of a static one
Date:   Mon, 9 Sep 2019 11:27:37 -0500
Message-ID: <20190909162743.30114-8-bparrot@ti.com>
In-Reply-To: <20190909162743.30114-1-bparrot@ti.com>
References: <20190909162743.30114-1-bparrot@ti.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Using a statically defined format array would cause issue when
multiple vpfe instance would be connected to sub-device of
different capabilities. We need to use an instance based array
instead to properly maintain a per port/instance format list.

Signed-off-by: Benoit Parrot <bparrot@ti.com>
---
 drivers/media/platform/am437x/am437x-vpfe.c | 108 ++++++++------------
 drivers/media/platform/am437x/am437x-vpfe.h |  34 ++++++
 2 files changed, 74 insertions(+), 68 deletions(-)

diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
index ac759c066d00..e76dc2b3b7b8 100644
--- a/drivers/media/platform/am437x/am437x-vpfe.c
+++ b/drivers/media/platform/am437x/am437x-vpfe.c
@@ -69,30 +69,6 @@ static const struct vpfe_standard vpfe_standards[] = {
 	{V4L2_STD_625_50, 720, 576, {54, 59}, 1},
 };
 
-struct bus_format {
-	unsigned int width;
-	unsigned int bpp;
-};
-
-/*
- * struct vpfe_fmt - VPFE media bus format information
- * @code: V4L2 media bus format code
- * @shifted: V4L2 media bus format code for the same pixel layout but
- *	shifted to be 8 bits per pixel. =0 if format is not shiftable.
- * @pixelformat: V4L2 pixel format FCC identifier
- * @width: Bits per pixel (when transferred over a bus)
- * @bpp: Bytes per pixel (when stored in memory)
- * @supported: Indicates format supported by subdev
- */
-struct vpfe_fmt {
-	u32 fourcc;
-	u32 code;
-	struct bus_format l;
-	struct bus_format s;
-	bool supported;
-	u32 index;
-};
-
 static struct vpfe_fmt formats[] = {
 	{
 		.fourcc		= V4L2_PIX_FMT_YUYV,
@@ -101,7 +77,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 4,
 		.s.width	= 8,
 		.s.bpp		= 2,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_UYVY,
 		.code		= MEDIA_BUS_FMT_UYVY8_2X8,
@@ -109,7 +84,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 4,
 		.s.width	= 8,
 		.s.bpp		= 2,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_YVYU,
 		.code		= MEDIA_BUS_FMT_YVYU8_2X8,
@@ -117,7 +91,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 4,
 		.s.width	= 8,
 		.s.bpp		= 2,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_VYUY,
 		.code		= MEDIA_BUS_FMT_VYUY8_2X8,
@@ -125,7 +98,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 4,
 		.s.width	= 8,
 		.s.bpp		= 2,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_SBGGR8,
 		.code		= MEDIA_BUS_FMT_SBGGR8_1X8,
@@ -133,7 +105,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 2,
 		.s.width	= 8,
 		.s.bpp		= 1,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_SGBRG8,
 		.code		= MEDIA_BUS_FMT_SGBRG8_1X8,
@@ -141,7 +112,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 2,
 		.s.width	= 8,
 		.s.bpp		= 1,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_SGRBG8,
 		.code		= MEDIA_BUS_FMT_SGRBG8_1X8,
@@ -149,7 +119,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 2,
 		.s.width	= 8,
 		.s.bpp		= 1,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_SRGGB8,
 		.code		= MEDIA_BUS_FMT_SRGGB8_1X8,
@@ -157,7 +126,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 2,
 		.s.width	= 8,
 		.s.bpp		= 1,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_RGB565,
 		.code		= MEDIA_BUS_FMT_RGB565_2X8_LE,
@@ -165,7 +133,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 4,
 		.s.width	= 8,
 		.s.bpp		= 2,
-		.supported	= false,
 	}, {
 		.fourcc		= V4L2_PIX_FMT_RGB565X,
 		.code		= MEDIA_BUS_FMT_RGB565_2X8_BE,
@@ -173,7 +140,6 @@ static struct vpfe_fmt formats[] = {
 		.l.bpp		= 4,
 		.s.width	= 8,
 		.s.bpp		= 2,
-		.supported	= false,
 	},
 };
 
@@ -181,13 +147,14 @@ static int
 __vpfe_get_format(struct vpfe_device *vpfe,
 		  struct v4l2_format *format, unsigned int *bpp);
 
-static struct vpfe_fmt *find_format_by_code(unsigned int code)
+static struct vpfe_fmt *find_format_by_code(struct vpfe_device *vpfe,
+					    unsigned int code)
 {
 	struct vpfe_fmt *fmt;
 	unsigned int k;
 
-	for (k = 0; k < ARRAY_SIZE(formats); k++) {
-		fmt = &formats[k];
+	for (k = 0; k < vpfe->num_active_fmt; k++) {
+		fmt = vpfe->active_fmt[k];
 		if (fmt->code == code)
 			return fmt;
 	}
@@ -195,13 +162,14 @@ static struct vpfe_fmt *find_format_by_code(unsigned int code)
 	return NULL;
 }
 
-static struct vpfe_fmt *find_format_by_pix(unsigned int pixelformat)
+static struct vpfe_fmt *find_format_by_pix(struct vpfe_device *vpfe,
+					   unsigned int pixelformat)
 {
 	struct vpfe_fmt *fmt;
 	unsigned int k;
 
-	for (k = 0; k < ARRAY_SIZE(formats); k++) {
-		fmt = &formats[k];
+	for (k = 0; k < vpfe->num_active_fmt; k++) {
+		fmt = vpfe->active_fmt[k];
 		if (fmt->fourcc == pixelformat)
 			return fmt;
 	}
@@ -218,7 +186,7 @@ mbus_to_pix(struct vpfe_device *vpfe,
 	unsigned int bus_width = sdinfo->vpfe_param.bus_width;
 	struct vpfe_fmt *fmt;
 
-	fmt = find_format_by_code(mbus->code);
+	fmt = find_format_by_code(vpfe, mbus->code);
 	if (WARN_ON(fmt == NULL)) {
 		pr_err("Invalid mbus code set\n");
 		*bpp = 1;
@@ -241,12 +209,12 @@ static void pix_to_mbus(struct vpfe_device *vpfe,
 {
 	struct vpfe_fmt *fmt;
 
-	fmt = find_format_by_pix(pix_fmt->pixelformat);
+	fmt = find_format_by_pix(vpfe, pix_fmt->pixelformat);
 	if (!fmt) {
 		/* default to first entry */
 		vpfe_dbg(3, vpfe, "Invalid pixel code: %x, default used instead\n",
 			pix_fmt->pixelformat);
-		fmt = &formats[0];
+		fmt = vpfe->active_fmt[0];
 	}
 
 	memset(mbus_fmt, 0, sizeof(*mbus_fmt));
@@ -1494,8 +1462,7 @@ static int vpfe_enum_fmt(struct file *file, void  *priv,
 {
 	struct vpfe_device *vpfe = video_drvdata(file);
 	struct vpfe_subdev_info *sdinfo;
-	struct vpfe_fmt *fmt = NULL;
-	unsigned int k;
+	struct vpfe_fmt *fmt;
 
 	vpfe_dbg(2, vpfe, "vpfe_enum_format index:%d\n",
 		f->index);
@@ -1504,17 +1471,10 @@ static int vpfe_enum_fmt(struct file *file, void  *priv,
 	if (!sdinfo->sd)
 		return -EINVAL;
 
-	if (f->index > ARRAY_SIZE(formats))
+	if (f->index >= vpfe->num_active_fmt)
 		return -EINVAL;
 
-	for (k = 0; k < ARRAY_SIZE(formats); k++) {
-		if (formats[k].index == f->index) {
-			fmt = &formats[k];
-			break;
-		}
-	}
-	if (!fmt)
-		return -EINVAL;
+	fmt = vpfe->active_fmt[f->index];
 
 	f->pixelformat = fmt->fourcc;
 
@@ -1593,7 +1553,7 @@ static int vpfe_enum_size(struct file *file, void  *priv,
 	vpfe_dbg(2, vpfe, "vpfe_enum_size\n");
 
 	/* check for valid format */
-	fmt = find_format_by_pix(fsize->pixel_format);
+	fmt = find_format_by_pix(vpfe, fsize->pixel_format);
 	if (!fmt) {
 		vpfe_dbg(3, vpfe, "Invalid pixel code: %x, default used instead\n",
 			fsize->pixel_format);
@@ -2281,8 +2241,10 @@ vpfe_async_bound(struct v4l2_async_notifier *notifier,
 					       struct vpfe_device, v4l2_dev);
 	struct v4l2_subdev_mbus_code_enum mbus_code;
 	struct vpfe_subdev_info *sdinfo;
+	struct vpfe_fmt *fmt;
+	int ret = 0;
 	bool found = false;
-	int i, j;
+	int i, j, k;
 
 	vpfe_dbg(1, vpfe, "vpfe_async_bound\n");
 
@@ -2304,27 +2266,37 @@ vpfe_async_bound(struct v4l2_async_notifier *notifier,
 
 	vpfe->video_dev.tvnorms |= sdinfo->inputs[0].std;
 
-	/* setup the supported formats & indexes */
-	for (j = 0, i = 0; ; ++j) {
-		struct vpfe_fmt *fmt;
-		int ret;
-
+	vpfe->num_active_fmt = 0;
+	for (j = 0, i = 0; (ret != -EINVAL); ++j) {
 		memset(&mbus_code, 0, sizeof(mbus_code));
 		mbus_code.index = j;
 		mbus_code.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 		ret = v4l2_subdev_call(subdev, pad, enum_mbus_code,
-			       NULL, &mbus_code);
+				       NULL, &mbus_code);
 		if (ret)
-			break;
-
-		fmt = find_format_by_code(mbus_code.code);
-		if (!fmt)
 			continue;
 
-		fmt->supported = true;
-		fmt->index = i++;
+		vpfe_dbg(3, vpfe,
+			 "subdev %s: code: %04x idx: %d\n",
+			 subdev->name, mbus_code.code, j);
+
+		for (k = 0; k < ARRAY_SIZE(formats); k++) {
+			fmt = &formats[k];
+			if (mbus_code.code != fmt->code)
+				continue;
+			vpfe->active_fmt[i] = fmt;
+			vpfe_dbg(3, vpfe,
+				 "matched fourcc: %4.4s code: %04x idx: %d\n",
+				 (char *)&fmt->fourcc, mbus_code.code, i);
+			vpfe->num_active_fmt = ++i;
+		}
 	}
 
+	if (!i) {
+		vpfe_err(vpfe, "No suitable format reported by subdev %s\n",
+			 subdev->name);
+		return -EINVAL;
+	}
 	return 0;
 }
 
diff --git a/drivers/media/platform/am437x/am437x-vpfe.h b/drivers/media/platform/am437x/am437x-vpfe.h
index 2dde09780215..6f25750f84e4 100644
--- a/drivers/media/platform/am437x/am437x-vpfe.h
+++ b/drivers/media/platform/am437x/am437x-vpfe.h
@@ -215,6 +215,37 @@ struct vpfe_ccdc {
 	u32 ccdc_ctx[VPFE_REG_END / sizeof(u32)];
 };
 
+/*
+ * struct bus_format - VPFE bus format information
+ * @width: Bits per pixel (when transferred over a bus)
+ * @bpp: Bytes per pixel (when stored in memory)
+ */
+struct bus_format {
+	unsigned int width;
+	unsigned int bpp;
+};
+
+/*
+ * struct vpfe_fmt - VPFE media bus format information
+ * @fourcc: V4L2 pixel format code
+ * @code: V4L2 media bus format code
+ * @l: 10 bit bus format info
+ * @s: 8 bit bus format info
+ */
+struct vpfe_fmt {
+	u32 fourcc;
+	u32 code;
+	struct bus_format l;
+	struct bus_format s;
+};
+
+/*
+ * This value needs to be at least as large as the number of entry in
+ * formats[].
+ * When formats[] is modified make sure to adjust this value also.
+ */
+#define VPFE_MAX_ACTIVE_FMT	10
+
 struct vpfe_device {
 	/* V4l2 specific parameters */
 	/* Identifies video device for this channel */
@@ -252,6 +283,9 @@ struct vpfe_device {
 	struct v4l2_format fmt;
 	/* Used to store current bytes per pixel based on current format */
 	unsigned int bpp;
+	struct vpfe_fmt	*active_fmt[VPFE_MAX_ACTIVE_FMT];
+	unsigned int num_active_fmt;
+
 	/*
 	 * used when IMP is chained to store the crop window which
 	 * is different from the image window
-- 
2.17.1