[PATCH v2 12/15] [media] mtk-mipicsi: add function to get the format

[Stu Hsieh]

This patch add function to get the format

This function can get the subdev format and host format.
Calculate the number of format which intersection of subdev and host.

Signed-off-by: Stu Hsieh <stu.hsieh@xxxxxxxxxxxx>
---
 .../media/platform/mtk-mipicsi/mtk_mipicsi.c  | 148 ++++++++++++++++++
 1 file changed, 148 insertions(+)

diff --git a/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c b/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
index 4027ed9c94f3..5e4028d0d5e1 100644
--- a/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
+++ b/drivers/media/platform/mtk-mipicsi/mtk_mipicsi.c
@@ -163,6 +163,50 @@ struct mtk_mipicsi_dev {
 	u32 bytesperline;
 };
 
+static const struct soc_mbus_lookup mtk_mipicsi_formats[] = {
+{
+	.code = MEDIA_BUS_FMT_YUYV8_2X8,
+	.fmt = {
+		.fourcc			= V4L2_PIX_FMT_YUYV,
+		.name			= "YUYV",
+		.bits_per_sample	= 8,
+		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
+		.order			= SOC_MBUS_ORDER_LE,
+		.layout			= SOC_MBUS_LAYOUT_PACKED,
+	},
+}, {
+	.code = MEDIA_BUS_FMT_YVYU8_2X8,
+	.fmt = {
+		.fourcc			= V4L2_PIX_FMT_YVYU,
+		.name			= "YVYU",
+		.bits_per_sample	= 8,
+		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
+		.order			= SOC_MBUS_ORDER_LE,
+		.layout			= SOC_MBUS_LAYOUT_PACKED,
+	},
+}, {
+	.code = MEDIA_BUS_FMT_UYVY8_2X8,
+	.fmt = {
+		.fourcc			= V4L2_PIX_FMT_UYVY,
+		.name			= "UYVY",
+		.bits_per_sample	= 8,
+		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
+		.order			= SOC_MBUS_ORDER_LE,
+		.layout			= SOC_MBUS_LAYOUT_PACKED,
+	},
+}, {
+	.code = MEDIA_BUS_FMT_VYUY8_2X8,
+	.fmt = {
+		.fourcc			= V4L2_PIX_FMT_VYUY,
+		.name			= "VYUY",
+		.bits_per_sample	= 8,
+		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
+		.order			= SOC_MBUS_ORDER_LE,
+		.layout			= SOC_MBUS_LAYOUT_PACKED,
+	},
+},
+};
+
 #define MTK_MIPICSI_BUS_PARAM (V4L2_MBUS_MASTER |	\
 		V4L2_MBUS_HSYNC_ACTIVE_HIGH |	\
 		V4L2_MBUS_HSYNC_ACTIVE_LOW |	\
@@ -207,6 +251,43 @@ static void mtk_mipicsi_ana_clk_enable(void __iomem *base, bool enable)
 	}
 }
 
+static int mtk_mipicsi_try_bus_param(struct soc_camera_device *icd,
+					    unsigned char buswidth)
+{
+	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+	struct mtk_mipicsi_dev *mipicsi = ici->priv;
+	struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_CSI2_DPHY,};
+	unsigned long common_flags = 0;
+	int ret = 0;
+
+	ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
+	if (ret == 0) {
+		common_flags = soc_mbus_config_compatible(&cfg,
+				MTK_MIPICSI_BUS_PARAM);
+		if (common_flags == 0U) {
+			dev_warn(icd->parent, "Flags incompatible: camera 0x%x\n",
+				cfg.flags);
+			return -EINVAL;
+		}
+	} else {
+		if (ret != -ENOIOCTLCMD)
+			return ret;
+	}
+
+	if ((((u16)1U << (buswidth - 1U)) & mipicsi->width_flags) != 0U)
+		return 0;
+
+	return -EINVAL;
+}
+
+static bool mtk_mipicsi_packing_supported(const struct soc_mbus_pixelfmt *fmt)
+{
+	return	fmt->packing == SOC_MBUS_PACKING_NONE ||
+		(fmt->bits_per_sample == 8U &&
+		 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI);
+}
+
 static int get_subdev_register(const struct soc_camera_device *icd,
 	struct v4l2_dbg_register *reg)
 {
@@ -330,6 +411,72 @@ static void mtk_mipicsi_remove_device(struct soc_camera_device *icd)
 	(void)pm_runtime_put_sync(icd->parent);
 }
 
+static int mtk_mipicsi_get_formats(struct soc_camera_device *icd,
+		unsigned int idx, struct soc_camera_format_xlate *xlate)
+{
+	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+	int formats = 0, ret, i;
+	int n = ARRAY_SIZE(mtk_mipicsi_formats);
+
+	struct v4l2_subdev_mbus_code_enum mbus_code = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+		.index = idx,
+	};
+	/* subdev format */
+	const struct soc_mbus_pixelfmt *fmt;
+
+	ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &mbus_code);
+	if (ret < 0)
+		/* No more formats */
+		return 0;
+
+	/* get subdev support format */
+	fmt = soc_mbus_get_fmtdesc(mbus_code.code);
+	if (fmt == NULL) {
+		dev_err(icd->parent, "Invalid format code #%u: %d",
+			idx, mbus_code.code);
+		return 0;
+	}
+
+	/* This also checks support for the requested bits-per-sample */
+	ret = mtk_mipicsi_try_bus_param(icd, fmt->bits_per_sample);
+	if (ret < 0) {
+		dev_err(icd->parent, "Fail to try the bus parameters.\n");
+		return 0;
+	}
+
+	switch (mbus_code.code) {
+	case MEDIA_BUS_FMT_UYVY8_2X8:
+	case MEDIA_BUS_FMT_VYUY8_2X8:
+	case MEDIA_BUS_FMT_YUYV8_2X8:
+	case MEDIA_BUS_FMT_YVYU8_2X8:
+			dev_dbg(icd->parent, "Providing format %s using code %d\n",
+				fmt->name, mbus_code.code);
+		break;
+	default:
+		if (!mtk_mipicsi_packing_supported(fmt))
+			return 0;
+		if (xlate != NULL)
+			dev_dbg(icd->parent,
+				"Providing format %s in pass-through mode\n",
+				fmt->name);
+		break;
+	}
+
+	/* get camera host and subdev format intersection */
+	for (i = 0; i < n; ++i)
+		if (mtk_mipicsi_formats[i].fmt.fourcc == fmt->fourcc) {
+			++formats;
+			if (xlate != NULL) {
+				xlate->host_fmt = &mtk_mipicsi_formats[i].fmt;
+				xlate->code = mbus_code.code;
+				xlate++;
+			}
+		}
+
+	return formats;
+}
+
 static bool is_supported(const u32 pixformat)
 {
 	switch (pixformat) {
@@ -730,6 +877,7 @@ static struct soc_camera_host_ops mtk_soc_camera_host_ops = {
 	.owner			= THIS_MODULE,
 	.add			= mtk_mipicsi_add_device,
 	.remove			= mtk_mipicsi_remove_device,
+	.get_formats            = mtk_mipicsi_get_formats,
 	.set_fmt		= mtk_mipicsi_set_fmt,
 	.try_fmt		= mtk_mipicsi_try_fmt,
 	.init_videobuf2	= mtk_mipicsi_init_videobuf2,
-- 
2.18.0