[PATCH v2 30/32] media: synopsys: csi2: Add Image Pixel Interface (IPI) support for v150

[Frank Li]

Add Image Pixel Interface (IPI) support for v150. Check the ipi_mode
register to determine whether the hardware supports IPI.

Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
 drivers/media/platform/synopsys/mipi-csi2.c | 82 +++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/drivers/media/platform/synopsys/mipi-csi2.c b/drivers/media/platform/synopsys/mipi-csi2.c
index 8051cfcd8ee158c5efccae9aff124c01a878e916..48ae455a77b2365b6df8a79a366b37c7f1dfe590 100644
--- a/drivers/media/platform/synopsys/mipi-csi2.c
+++ b/drivers/media/platform/synopsys/mipi-csi2.c
@@ -40,6 +40,11 @@ struct dw_csi2_regs {
 	u32	msk2;
 	u32	phy_tst_ctrl0;
 	u32	phy_tst_ctrl1;
+	u32	ipi_softrstn;
+	u32	ipi_datatype;
+	u32	ipi_vcid;
+	u32	ipi_mode;
+	u32	ipi_mem_flush;
 	u32	int_st_main;
 	u32	int_st_dphy_fatal;
 	u32	int_msk_dphy_fatal;
@@ -90,6 +95,11 @@ static const struct dw_csi2_regs dw_csi2_v150 = {
 	.phy_stopstate = DW_REG(0x4c),
 	.phy_tst_ctrl0 = DW_REG(0x50),
 	.phy_tst_ctrl1 = DW_REG(0x54),
+	.ipi_mode = DW_REG(0x80),
+	.ipi_vcid = DW_REG(0x84),
+	.ipi_datatype = DW_REG(0x88),
+	.ipi_mem_flush = DW_REG(0x8c),
+	.ipi_softrstn = DW_REG(0xa0),
 	.int_st_dphy_fatal = DW_REG(0xe0),
 	.int_msk_dphy_fatal = DW_REG(0xe4),
 	.int_force_dphy_fatal = DW_REG(0xe8),
@@ -115,6 +125,31 @@ static const struct dw_csi2_regs dw_csi2_v150 = {
 #define INT_ST_MAIN_ERR_PHY			BIT(16)
 #define INT_ST_MAIN_FATAL_ERR_IPI		BIT(18)
 
+#define IPI_VCID_VC(x)				FIELD_PREP(GENMASK(1, 0), (x))
+#define IPI_VCID_VC_0_1(x)			FIELD_PREP(GENMASK(3, 2), (x))
+#define IPI_VCID_VC_2				BIT(4)
+
+#define IPI_DATA_TYPE_DT(x)			FIELD_PREP(GENMASK(5, 0), (x))
+#define IPI_DATA_TYPE_EMB_DATA_EN		BIT(8)
+
+#define IPI_MODE_CONTROLLER			BIT(1)
+#define IPI_MODE_COLOR_MODE16			BIT(8)
+#define IPI_MODE_CUT_THROUGH			BIT(16)
+#define IPI_MODE_ENABLE				BIT(24)
+
+#define IPI_MEM_FLUSH_AUTO			BIT(8)
+
+#define INT_ST_MAIN_FATAL_ERR_PHY		BIT(0)
+#define INT_ST_MAIN_FATAL_ERR_PKT		BIT(1)
+#define INT_ST_MAIN_FATAL_ERR_BNDRY_FRAMEL	BIT(2)
+#define INT_ST_MAIN_FATAL_ERR_SEQ_FRAME		BIT(3)
+#define INT_ST_MAIN_FATAL_ERR_CRC_FRAME		BIT(4)
+#define INT_ST_MAIN_FATAL_ERR_PLD_CRC		BIT(5)
+#define INT_ST_MAIN_ERR_DID			BIT(6)
+#define INT_ST_MAIN_ERR_ECC			BIT(7)
+#define INT_ST_MAIN_ERR_PHY			BIT(16)
+#define INT_ST_MAIN_FATAL_ERR_IPI		BIT(18)
+
 #define INT_MSK_DPHY_FATAL_ERR_SOT_LANE0	BIT(0)
 #define INT_MSK_DPHY_FATAL_ERR_SOT_LANE1	BIT(1)
 
@@ -449,6 +484,48 @@ static int dw_mipi_csi2_phy_prep(struct dw_mipi_csi2_dev *csi2, int bpp)
 	return ret;
 }
 
+static void dw_csi2_device_ipi_config(struct dw_mipi_csi2_dev *csi2)
+{
+	int dt = media_bus_fmt_to_csi2_dt(csi2->format_mbus.code);
+	u32 val;
+
+	/* Do IPI soft reset */
+	dw_writel(csi2, 0x0, ipi_softrstn);
+	dw_writel(csi2, 0x1, ipi_softrstn);
+
+	/* Select virtual channel and data type to be processed by IPI */
+	val = IPI_DATA_TYPE_DT(dt);
+	dw_writel(csi2, val, ipi_datatype);
+
+	/* Set virtual channel 0 as default */
+	val  = IPI_VCID_VC(0);
+	dw_writel(csi2, val, ipi_vcid);
+
+	/*
+	 * Select IPI camera timing mode and allow the pixel stream
+	 * to be non-continuous when pixel interface FIFO is empty
+	 */
+	val = dw_readl(csi2, ipi_mode);
+	val &= ~IPI_MODE_CONTROLLER;
+	val &= ~IPI_MODE_COLOR_MODE16;
+	val |= IPI_MODE_CUT_THROUGH;
+	dw_writel(csi2, val, ipi_mode);
+}
+
+static void dw_csi2_ipi_enable(struct dw_mipi_csi2_dev *csi2)
+{
+	u32 val;
+
+	/* Memory is automatically flushed at each Frame Start */
+	val = IPI_MEM_FLUSH_AUTO;
+	dw_writel(csi2, val, ipi_mem_flush);
+
+	/* Enable IPI */
+	val = dw_readl(csi2, ipi_mode);
+	val |= IPI_MODE_ENABLE;
+	dw_writel(csi2, val, ipi_mode);
+}
+
 static void dw_csi2_enable_irq(struct dw_mipi_csi2_dev *csi2)
 {
 	u32 val;
@@ -583,6 +660,11 @@ static int csi2_start(struct dw_mipi_csi2_dev *csi2, int bpp)
 	if (ret)
 		goto err_stop_upstream;
 
+	if (csi2->regs->ipi_mode) {
+		dw_csi2_device_ipi_config(csi2);
+		dw_csi2_ipi_enable(csi2);
+	}
+
 	dw_csi2_enable_irq(csi2);
 
 	return 0;

-- 
2.34.1