rockchip: video: Add mipi driver support for rockchip soc

Add basic driver for mipi display on rockchip soc platform.

Signed-off-by: Eric Gao <eric.gao@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>

1 files changed, 491 insertions, 0 deletions

diff --git a/drivers/video/rockchip/rk_mipi.c b/drivers/video/rockchip/rk_mipi.c
new file mode 100644
index 0000000000..4d9d12e1d7
--- /dev/null
+++ b/drivers/video/rockchip/rk_mipi.c
@@ -0,0 +1,491 @@
+/*
+ * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
+ * Author: Eric Gao <eric.gao@rock-chips.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <display.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <panel.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/gpio.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <dm/uclass-internal.h>
+#include <linux/kernel.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk3399.h>
+#include <asm/arch/grf_rk3399.h>
+#include <asm/arch/rockchip_mipi_dsi.h>
+#include <dt-bindings/clock/rk3288-cru.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Private information for rk mipi
+ *
+ * @regs: mipi controller address
+ * @grf: GRF register
+ * @panel: panel assined by device tree
+ * @ref_clk: reference clock for mipi dsi pll
+ * @sysclk: config clock for mipi dsi register
+ * @pix_clk: pixel clock for vop->dsi data transmission
+ * @phy_clk: mipi dphy output clock
+ * @txbyte_clk: clock for dsi->dphy high speed data transmission
+ * @txesc_clk: clock for tx esc mode
+ */
+struct rk_mipi_priv {
+	void __iomem *regs;
+	struct rk3399_grf_regs *grf;
+	struct udevice *panel;
+	struct mipi_dsi *dsi;
+	u32 ref_clk;
+	u32 sys_clk;
+	u32 pix_clk;
+	u32 phy_clk;
+	u32 txbyte_clk;
+	u32 txesc_clk;
+};
+
+static int rk_mipi_read_timing(struct udevice *dev,
+			       struct display_timing *timing)
+{
+	int ret;
+
+	ret = fdtdec_decode_display_timing(gd->fdt_blob, dev_of_offset(dev),
+					 0, timing);
+	if (ret) {
+		debug("%s: Failed to decode display timing (ret=%d)\n",
+		      __func__, ret);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * Register write function used only for mipi dsi controller.
+ * Parameter:
+ *  @regs: mipi controller address
+ *  @reg: combination of regaddr(16bit)|bitswidth(8bit)|offset(8bit) you can
+ *        use define in rk_mipi.h directly for this parameter
+ *  @val: value that will be write to specified bits of register
+ */
+static void rk_mipi_dsi_write(u32 regs, u32 reg, u32 val)
+{
+	u32 dat;
+	u32 mask;
+	u32 offset = (reg >> OFFSET_SHIFT) & 0xff;
+	u32 bits = (reg >> BITS_SHIFT) & 0xff;
+	u64 addr = (reg >> ADDR_SHIFT) + regs;
+
+	/* Mask for specifiled bits,the corresponding bits will be clear */
+	mask = ~((0xffffffff << offset) & (0xffffffff >> (32 - offset - bits)));
+
+	/* Make sure val in the available range */
+	val &= ~(0xffffffff << bits);
+
+	/* Get register's original val */
+	dat = readl(addr);
+
+	/* Clear specified bits */
+	dat &= mask;
+
+	/* Fill specified bits */
+	dat |= val << offset;
+
+	writel(dat, addr);
+}
+
+static int rk_mipi_dsi_enable(struct udevice *dev,
+			      const struct display_timing *timing)
+{
+	int node, timing_node;
+	int val;
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+	u64 regs = (u64)priv->regs;
+	struct display_plat *disp_uc_plat = dev_get_uclass_platdata(dev);
+	u32 txbyte_clk = priv->txbyte_clk;
+	u32 txesc_clk = priv->txesc_clk;
+
+	txesc_clk = txbyte_clk/(txbyte_clk/txesc_clk + 1);
+
+	/* Select the video source */
+	switch (disp_uc_plat->source_id) {
+	case VOP_B:
+		rk_clrsetreg(&priv->grf->soc_con20, GRF_DSI0_VOP_SEL_MASK,
+			     GRF_DSI0_VOP_SEL_B << GRF_DSI0_VOP_SEL_SHIFT);
+		 break;
+	case VOP_L:
+		rk_clrsetreg(&priv->grf->soc_con20, GRF_DSI0_VOP_SEL_MASK,
+			     GRF_DSI0_VOP_SEL_L << GRF_DSI0_VOP_SEL_SHIFT);
+		 break;
+	default:
+		 debug("%s: Invalid VOP id\n", __func__);
+		 return -EINVAL;
+	}
+
+	/* Set Controller as TX mode */
+	val = GRF_DPHY_TX0_RXMODE_DIS << GRF_DPHY_TX0_RXMODE_SHIFT;
+	rk_clrsetreg(&priv->grf->soc_con22, GRF_DPHY_TX0_RXMODE_MASK, val);
+
+	/* Exit tx stop mode */
+	val |= GRF_DPHY_TX0_TXSTOPMODE_DIS << GRF_DPHY_TX0_TXSTOPMODE_SHIFT;
+	rk_clrsetreg(&priv->grf->soc_con22, GRF_DPHY_TX0_TXSTOPMODE_MASK, val);
+
+	/* Disable turnequest */
+	val |= GRF_DPHY_TX0_TURNREQUEST_DIS << GRF_DPHY_TX0_TURNREQUEST_SHIFT;
+	rk_clrsetreg(&priv->grf->soc_con22, GRF_DPHY_TX0_TURNREQUEST_MASK, val);
+
+	/* Set Display timing parameter */
+	rk_mipi_dsi_write(regs, VID_HSA_TIME, timing->hsync_len.typ);
+	rk_mipi_dsi_write(regs, VID_HBP_TIME, timing->hback_porch.typ);
+	rk_mipi_dsi_write(regs, VID_HLINE_TIME, (timing->hsync_len.typ
+			  + timing->hback_porch.typ + timing->hactive.typ
+			  + timing->hfront_porch.typ));
+	rk_mipi_dsi_write(regs, VID_VSA_LINES, timing->vsync_len.typ);
+	rk_mipi_dsi_write(regs, VID_VBP_LINES, timing->vback_porch.typ);
+	rk_mipi_dsi_write(regs, VID_VFP_LINES, timing->vfront_porch.typ);
+	rk_mipi_dsi_write(regs, VID_ACTIVE_LINES, timing->vactive.typ);
+
+	/* Set Signal Polarity */
+	val = (timing->flags & DISPLAY_FLAGS_HSYNC_LOW) ? 1 : 0;
+	rk_mipi_dsi_write(regs, HSYNC_ACTIVE_LOW, val);
+
+	val = (timing->flags & DISPLAY_FLAGS_VSYNC_LOW) ? 1 : 0;
+	rk_mipi_dsi_write(regs, VSYNC_ACTIVE_LOW, val);
+
+	val = (timing->flags & DISPLAY_FLAGS_DE_LOW) ? 1 : 0;
+	rk_mipi_dsi_write(regs, DISPLAY_FLAGS_DE_LOW, val);
+
+	val = (timing->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) ? 1 : 0;
+	rk_mipi_dsi_write(regs, COLORM_ACTIVE_LOW, val);
+
+	/* Set video mode */
+	rk_mipi_dsi_write(regs, CMD_VIDEO_MODE, VIDEO_MODE);
+
+	/* Set video mode transmission type as burst mode */
+	rk_mipi_dsi_write(regs, VID_MODE_TYPE, BURST_MODE);
+
+	/* Set pix num in a video package */
+	rk_mipi_dsi_write(regs, VID_PKT_SIZE, 0x4b0);
+
+	/* Set dpi color coding depth 24 bit */
+	timing_node = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(dev),
+									 "display-timings");
+	node = fdt_first_subnode(gd->fdt_blob, timing_node);
+	val = fdtdec_get_int(gd->fdt_blob, node, "bits-per-pixel", -1);
+	switch (val) {
+	case 16:
+		rk_mipi_dsi_write(regs, DPI_COLOR_CODING, DPI_16BIT_CFG_1);
+		break;
+	case 24:
+		rk_mipi_dsi_write(regs, DPI_COLOR_CODING, DPI_24BIT);
+		break;
+	case 30:
+		rk_mipi_dsi_write(regs, DPI_COLOR_CODING, DPI_30BIT);
+		break;
+	default:
+		rk_mipi_dsi_write(regs, DPI_COLOR_CODING, DPI_24BIT);
+	}
+	/* Enable low power mode */
+	rk_mipi_dsi_write(regs, LP_CMD_EN, 1);
+	rk_mipi_dsi_write(regs, LP_HFP_EN, 1);
+	rk_mipi_dsi_write(regs, LP_VACT_EN, 1);
+	rk_mipi_dsi_write(regs, LP_VFP_EN, 1);
+	rk_mipi_dsi_write(regs, LP_VBP_EN, 1);
+	rk_mipi_dsi_write(regs, LP_VSA_EN, 1);
+
+	/* Division for timeout counter clk */
+	rk_mipi_dsi_write(regs, TO_CLK_DIVISION, 0x0a);
+
+	/* Tx esc clk division from txbyte clk */
+	rk_mipi_dsi_write(regs, TX_ESC_CLK_DIVISION, txbyte_clk/txesc_clk);
+
+	/* Timeout count for hs<->lp transation between Line period */
+	rk_mipi_dsi_write(regs, HSTX_TO_CNT, 0x3e8);
+
+	/* Phy State transfer timing */
+	rk_mipi_dsi_write(regs, PHY_STOP_WAIT_TIME, 32);
+	rk_mipi_dsi_write(regs, PHY_TXREQUESTCLKHS, 1);
+	rk_mipi_dsi_write(regs, PHY_HS2LP_TIME, 0x14);
+	rk_mipi_dsi_write(regs, PHY_LP2HS_TIME, 0x10);
+	rk_mipi_dsi_write(regs, MAX_RD_TIME, 0x2710);
+
+	/* Power on */
+	rk_mipi_dsi_write(regs, SHUTDOWNZ, 1);
+
+	return 0;
+}
+
+/* rk mipi dphy write function. It is used to write test data to dphy */
+static void rk_mipi_phy_write(u32 regs, unsigned char test_code,
+			      unsigned char *test_data, unsigned char size)
+{
+	int i = 0;
+
+	/* Write Test code */
+	rk_mipi_dsi_write(regs, PHY_TESTCLK, 1);
+	rk_mipi_dsi_write(regs, PHY_TESTDIN, test_code);
+	rk_mipi_dsi_write(regs, PHY_TESTEN, 1);
+	rk_mipi_dsi_write(regs, PHY_TESTCLK, 0);
+	rk_mipi_dsi_write(regs, PHY_TESTEN, 0);
+
+	/* Write Test data */
+	for (i = 0; i < size; i++) {
+		rk_mipi_dsi_write(regs, PHY_TESTCLK, 0);
+		rk_mipi_dsi_write(regs, PHY_TESTDIN, test_data[i]);
+		rk_mipi_dsi_write(regs, PHY_TESTCLK, 1);
+	}
+}
+
+/*
+ * Mipi dphy config function. Calculate the suitable prediv, feedback div,
+ * fsfreqrang value ,cap ,lpf and so on according to the given pix clk rate,
+ * and then enable phy.
+ */
+static int rk_mipi_phy_enable(struct udevice *dev)
+{
+	int i;
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+	u64 regs = (u64)priv->regs;
+	u64 fbdiv;
+	u64 prediv = 1;
+	u32 max_fbdiv = 512;
+	u32 max_prediv, min_prediv;
+	u64 ddr_clk = priv->phy_clk;
+	u32 refclk = priv->ref_clk;
+	u32 remain = refclk;
+	unsigned char test_data[2] = {0};
+
+	int freq_rang[][2] = {
+		{90, 0x01},   {100, 0x10},  {110, 0x20},  {130, 0x01},
+		{140, 0x11},  {150, 0x21},  {170, 0x02},  {180, 0x12},
+		{200, 0x22},  {220, 0x03},  {240, 0x13},  {250, 0x23},
+		{270, 0x04},  {300, 0x14},  {330, 0x05},  {360, 0x15},
+		{400, 0x25},  {450, 0x06},  {500, 0x16},  {550, 0x07},
+		{600, 0x17},  {650, 0x08},  {700, 0x18},  {750, 0x09},
+		{800, 0x19},  {850, 0x29},  {900, 0x39},  {950, 0x0a},
+		{1000, 0x1a}, {1050, 0x2a}, {1100, 0x3a}, {1150, 0x0b},
+		{1200, 0x1b}, {1250, 0x2b}, {1300, 0x3b}, {1350, 0x0c},
+		{1400, 0x1c}, {1450, 0x2c}, {1500, 0x3c}
+	};
+
+	/* Shutdown mode */
+	rk_mipi_dsi_write(regs, PHY_SHUTDOWNZ, 0);
+	rk_mipi_dsi_write(regs, PHY_RSTZ, 0);
+	rk_mipi_dsi_write(regs, PHY_TESTCLR, 1);
+
+	/* Pll locking */
+	rk_mipi_dsi_write(regs, PHY_TESTCLR, 0);
+
+	/* config cp and lfp */
+	test_data[0] = 0x80 | (ddr_clk / (200 * MHz)) << 3 | 0x3;
+	rk_mipi_phy_write(regs, CODE_PLL_VCORANGE_VCOCAP, test_data, 1);
+
+	test_data[0] = 0x8;
+	rk_mipi_phy_write(regs, CODE_PLL_CPCTRL, test_data, 1);
+
+	test_data[0] = 0x80 | 0x40;
+	rk_mipi_phy_write(regs, CODE_PLL_LPF_CP, test_data, 1);
+
+	/* select the suitable value for fsfreqrang reg */
+	for (i = 0; i < ARRAY_SIZE(freq_rang); i++) {
+		if (ddr_clk / (MHz) >= freq_rang[i][0])
+			break;
+	}
+	if (i == ARRAY_SIZE(freq_rang)) {
+		debug("%s: Dphy freq out of range!\n", __func__);
+		return -EINVAL;
+	}
+	test_data[0] = freq_rang[i][1] << 1;
+	rk_mipi_phy_write(regs, CODE_HS_RX_LANE0, test_data, 1);
+
+	/*
+	 * Calculate the best ddrclk and it's corresponding div value. If the
+	 * given pixelclock is great than 250M, ddrclk will be fix 1500M.
+	 * Otherwise,
+	 * it's equal to ddr_clk= pixclk * 6. 40MHz >= refclk / prediv >= 5MHz
+	 * according to spec.
+	 */
+	max_prediv = (refclk / (5 * MHz));
+	min_prediv = ((refclk / (40 * MHz)) ? (refclk / (40 * MHz) + 1) : 1);
+
+	debug("%s: DEBUG: max_prediv=%u, min_prediv=%u\n", __func__, max_prediv,
+	      min_prediv);
+
+	if (max_prediv < min_prediv) {
+		debug("%s: Invalid refclk value\n", __func__);
+		return -EINVAL;
+	}
+
+	/* Calculate the best refclk and feedback division value for dphy pll */
+	for (i = min_prediv; i < max_prediv; i++) {
+		if ((ddr_clk * i % refclk < remain) &&
+		    (ddr_clk * i / refclk) < max_fbdiv) {
+			prediv = i;
+			remain = ddr_clk * i % refclk;
+		}
+	}
+	fbdiv = ddr_clk * prediv / refclk;
+	ddr_clk = refclk * fbdiv / prediv;
+	priv->phy_clk = ddr_clk;
+
+	debug("%s: DEBUG: refclk=%u, refclk=%llu, fbdiv=%llu, phyclk=%llu\n",
+	      __func__, refclk, prediv, fbdiv, ddr_clk);
+
+	/* config prediv and feedback reg */
+	test_data[0] = prediv - 1;
+	rk_mipi_phy_write(regs, CODE_PLL_INPUT_DIV_RAT, test_data, 1);
+	test_data[0] = (fbdiv - 1) & 0x1f;
+	rk_mipi_phy_write(regs, CODE_PLL_LOOP_DIV_RAT, test_data, 1);
+	test_data[0] = (fbdiv - 1) >> 5 | 0x80;
+	rk_mipi_phy_write(regs, CODE_PLL_LOOP_DIV_RAT, test_data, 1);
+	test_data[0] = 0x30;
+	rk_mipi_phy_write(regs, CODE_PLL_INPUT_LOOP_DIV_RAT, test_data, 1);
+
+	/* rest config */
+	test_data[0] = 0x4d;
+	rk_mipi_phy_write(regs, CODE_BANDGAP_BIAS_CTRL, test_data, 1);
+
+	test_data[0] = 0x3d;
+	rk_mipi_phy_write(regs, CODE_TERMINATION_CTRL, test_data, 1);
+
+	test_data[0] = 0xdf;
+	rk_mipi_phy_write(regs, CODE_TERMINATION_CTRL, test_data, 1);
+
+	test_data[0] =  0x7;
+	rk_mipi_phy_write(regs, CODE_AFE_BIAS_BANDGAP_ANOLOG, test_data, 1);
+
+	test_data[0] = 0x80 | 0x7;
+	rk_mipi_phy_write(regs, CODE_AFE_BIAS_BANDGAP_ANOLOG, test_data, 1);
+
+	test_data[0] = 0x80 | 15;
+	rk_mipi_phy_write(regs, CODE_HSTXDATALANEREQUSETSTATETIME,
+			  test_data, 1);
+	test_data[0] = 0x80 | 85;
+	rk_mipi_phy_write(regs, CODE_HSTXDATALANEPREPARESTATETIME,
+			  test_data, 1);
+	test_data[0] = 0x40 | 10;
+	rk_mipi_phy_write(regs, CODE_HSTXDATALANEHSZEROSTATETIME,
+			  test_data, 1);
+
+	/* enter into stop mode */
+	rk_mipi_dsi_write(regs, N_LANES, 0x03);
+	rk_mipi_dsi_write(regs, PHY_ENABLECLK, 1);
+	rk_mipi_dsi_write(regs, PHY_FORCEPLL, 1);
+	rk_mipi_dsi_write(regs, PHY_SHUTDOWNZ, 1);
+	rk_mipi_dsi_write(regs, PHY_RSTZ, 1);
+
+	return 0;
+}
+
+/*
+ * This function is called by rk_display_init() using rk_mipi_dsi_enable() and
+ * rk_mipi_phy_enable() to initialize mipi controller and dphy. If success,
+ * enable backlight.
+ */
+static int rk_display_enable(struct udevice *dev, int panel_bpp,
+			  const struct display_timing *timing)
+{
+	int ret;
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+
+	/* Fill the mipi controller parameter */
+	priv->ref_clk = 24 * MHz;
+	priv->sys_clk = priv->ref_clk;
+	priv->pix_clk = timing->pixelclock.typ;
+	priv->phy_clk = priv->pix_clk * 6;
+	priv->txbyte_clk = priv->phy_clk / 8;
+	priv->txesc_clk = 20 * MHz;
+
+	/* Config  and enable mipi dsi according to timing */
+	ret = rk_mipi_dsi_enable(dev, timing);
+	if (ret) {
+		debug("%s: rk_mipi_dsi_enable() failed (err=%d)\n",
+		      __func__, ret);
+		return ret;
+	}
+
+	/* Config and enable mipi phy */
+	ret = rk_mipi_phy_enable(dev);
+	if (ret) {
+		debug("%s: rk_mipi_phy_enable() failed (err=%d)\n",
+		      __func__, ret);
+		return ret;
+	}
+
+	/* Enable backlight */
+	ret = panel_enable_backlight(priv->panel);
+	if (ret) {
+		debug("%s: panel_enable_backlight() failed (err=%d)\n",
+		      __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rk_mipi_ofdata_to_platdata(struct udevice *dev)
+{
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+
+	priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	if (priv->grf <= 0) {
+		debug("%s: Get syscon grf failed (ret=%llu)\n",
+		      __func__, (u64)priv->grf);
+		return  -ENXIO;
+	}
+	priv->regs = (void *)dev_get_addr(dev);
+	if (priv->regs <= 0) {
+		debug("%s: Get MIPI dsi address failed (ret=%llu)\n", __func__,
+		      (u64)priv->regs);
+		return  -ENXIO;
+	}
+
+	return 0;
+}
+
+/*
+ * Probe function: check panel existence and readingit's timing. Then config
+ * mipi dsi controller and enable it according to the timing parameter.
+ */
+static int rk_mipi_probe(struct udevice *dev)
+{
+	int ret;
+	struct rk_mipi_priv *priv = dev_get_priv(dev);
+
+	ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev, "rockchip,panel",
+					   &priv->panel);
+	if (ret) {
+		debug("%s: Can not find panel (err=%d)\n", __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dm_display_ops rk_mipi_dsi_ops = {
+	.read_timing = rk_mipi_read_timing,
+	.enable = rk_display_enable,
+};
+
+static const struct udevice_id rk_mipi_dsi_ids[] = {
+	{ .compatible = "rockchip,rk3399_mipi_dsi" },
+	{ }
+};
+
+U_BOOT_DRIVER(rk_mipi_dsi) = {
+	.name	= "rk_mipi_dsi",
+	.id	= UCLASS_DISPLAY,
+	.of_match = rk_mipi_dsi_ids,
+	.ofdata_to_platdata = rk_mipi_ofdata_to_platdata,
+	.probe	= rk_mipi_probe,
+	.ops	= &rk_mipi_dsi_ops,
+	.priv_auto_alloc_size   = sizeof(struct rk_mipi_priv),
+};