rockchip: video: Add a display driver for rockchip LVDS

Some Rockchip SoCs support LVDS output. Add a display driver for this so
that these displays can be used on supported boards.

Signed-off-by: Jacob Chen <jacob-chen@iotwrt.com>
Acked-by: Simon Glass <sjg@chromium.org>

2 files changed, 255 insertions, 1 deletions

diff --git a/drivers/video/rockchip/Makefile b/drivers/video/rockchip/Makefile
index 0e9a8ac..7962f86 100644
--- a/drivers/video/rockchip/Makefile
+++ b/drivers/video/rockchip/Makefile
@@ -5,4 +5,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += rk_edp.o rk_hdmi.o rk_vop.o
+obj-y += rk_edp.o rk_hdmi.o rk_vop.o rk_lvds.o
diff --git a/drivers/video/rockchip/rk_lvds.c b/drivers/video/rockchip/rk_lvds.c
new file mode 100644
index 0000000..dc10b86
--- /dev/null
+++ b/drivers/video/rockchip/rk_lvds.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright 2016 Rockchip Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <display.h>
+#include <dm.h>
+#include <edid.h>
+#include <panel.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/lvds_rk3288.h>
+#include <asm/arch/grf_rk3288.h>
+#include <dt-bindings/clock/rk3288-cru.h>
+#include <dt-bindings/video/rk3288.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * struct rk_lvds_priv - private rockchip lvds display driver info
+ *
+ * @reg: LVDS register address
+ * @grf: GRF register
+ * @panel: Panel device that is used in driver
+ *
+ * @output: Output mode, decided single or double channel,
+ *		LVDS or LVTLL
+ * @format: Data format that RGB data will packing as
+ */
+struct rk_lvds_priv {
+	void __iomem *regs;
+	struct rk3288_grf *grf;
+	struct udevice *panel;
+
+	int output;
+	int format;
+};
+
+static inline void lvds_writel(struct rk_lvds_priv *lvds, u32 offset, u32 val)
+{
+	writel(val, lvds->regs + offset);
+
+	writel(val, lvds->regs + offset + 0x100);
+}
+
+int rk_lvds_enable(struct udevice *dev, int panel_bpp,
+		   const struct display_timing *edid)
+{
+	struct rk_lvds_priv *priv = dev_get_priv(dev);
+	struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
+	int ret = 0;
+	unsigned int val = 0;
+
+	ret = panel_enable_backlight(priv->panel);
+	if (ret) {
+		debug("%s: backlight error: %d\n", __func__, ret);
+		return ret;
+	}
+
+	/* Select the video source */
+	if (uc_plat->source_id)
+		val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT |
+		    (RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16);
+	else
+		val = RK3288_LVDS_SOC_CON6_SEL_VOP_LIT << 16;
+	rk_setreg(&priv->grf->soc_con6, val);
+
+	/* Select data transfer format */
+	val = priv->format;
+	if (priv->output == LVDS_OUTPUT_DUAL)
+		val |= LVDS_DUAL | LVDS_CH0_EN | LVDS_CH1_EN;
+	else if (priv->output == LVDS_OUTPUT_SINGLE)
+		val |= LVDS_CH0_EN;
+	else if (priv->output == LVDS_OUTPUT_RGB)
+		val |= LVDS_TTL_EN | LVDS_CH0_EN | LVDS_CH1_EN;
+	val |= (0xffff << 16);
+	rk_setreg(&priv->grf->soc_con7, val);
+
+	/* Enable LVDS PHY */
+	if (priv->output == LVDS_OUTPUT_RGB) {
+		lvds_writel(priv, RK3288_LVDS_CH0_REG0,
+			    RK3288_LVDS_CH0_REG0_TTL_EN |
+			    RK3288_LVDS_CH0_REG0_LANECK_EN |
+			    RK3288_LVDS_CH0_REG0_LANE4_EN |
+			    RK3288_LVDS_CH0_REG0_LANE3_EN |
+			    RK3288_LVDS_CH0_REG0_LANE2_EN |
+			    RK3288_LVDS_CH0_REG0_LANE1_EN |
+			    RK3288_LVDS_CH0_REG0_LANE0_EN);
+		lvds_writel(priv, RK3288_LVDS_CH0_REG2,
+			    RK3288_LVDS_PLL_FBDIV_REG2(0x46));
+
+		lvds_writel(priv, RK3288_LVDS_CH0_REG3,
+			    RK3288_LVDS_PLL_FBDIV_REG3(0x46));
+		lvds_writel(priv, RK3288_LVDS_CH0_REG4,
+			    RK3288_LVDS_CH0_REG4_LANECK_TTL_MODE |
+			    RK3288_LVDS_CH0_REG4_LANE4_TTL_MODE |
+			    RK3288_LVDS_CH0_REG4_LANE3_TTL_MODE |
+			    RK3288_LVDS_CH0_REG4_LANE2_TTL_MODE |
+			    RK3288_LVDS_CH0_REG4_LANE1_TTL_MODE |
+			    RK3288_LVDS_CH0_REG4_LANE0_TTL_MODE);
+		lvds_writel(priv, RK3288_LVDS_CH0_REG5,
+			    RK3288_LVDS_CH0_REG5_LANECK_TTL_DATA |
+			    RK3288_LVDS_CH0_REG5_LANE4_TTL_DATA |
+			    RK3288_LVDS_CH0_REG5_LANE3_TTL_DATA |
+			    RK3288_LVDS_CH0_REG5_LANE2_TTL_DATA |
+			    RK3288_LVDS_CH0_REG5_LANE1_TTL_DATA |
+			    RK3288_LVDS_CH0_REG5_LANE0_TTL_DATA);
+		lvds_writel(priv, RK3288_LVDS_CH0_REGD,
+			    RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
+		lvds_writel(priv, RK3288_LVDS_CH0_REG20,
+			    RK3288_LVDS_CH0_REG20_LSB);
+	} else {
+		lvds_writel(priv, RK3288_LVDS_CH0_REG0,
+			    RK3288_LVDS_CH0_REG0_LVDS_EN |
+			    RK3288_LVDS_CH0_REG0_LANECK_EN |
+			    RK3288_LVDS_CH0_REG0_LANE4_EN |
+			    RK3288_LVDS_CH0_REG0_LANE3_EN |
+			    RK3288_LVDS_CH0_REG0_LANE2_EN |
+			    RK3288_LVDS_CH0_REG0_LANE1_EN |
+			    RK3288_LVDS_CH0_REG0_LANE0_EN);
+		lvds_writel(priv, RK3288_LVDS_CH0_REG1,
+			    RK3288_LVDS_CH0_REG1_LANECK_BIAS |
+			    RK3288_LVDS_CH0_REG1_LANE4_BIAS |
+			    RK3288_LVDS_CH0_REG1_LANE3_BIAS |
+			    RK3288_LVDS_CH0_REG1_LANE2_BIAS |
+			    RK3288_LVDS_CH0_REG1_LANE1_BIAS |
+			    RK3288_LVDS_CH0_REG1_LANE0_BIAS);
+		lvds_writel(priv, RK3288_LVDS_CH0_REG2,
+			    RK3288_LVDS_CH0_REG2_RESERVE_ON |
+			    RK3288_LVDS_CH0_REG2_LANECK_LVDS_MODE |
+			    RK3288_LVDS_CH0_REG2_LANE4_LVDS_MODE |
+			    RK3288_LVDS_CH0_REG2_LANE3_LVDS_MODE |
+			    RK3288_LVDS_CH0_REG2_LANE2_LVDS_MODE |
+			    RK3288_LVDS_CH0_REG2_LANE1_LVDS_MODE |
+			    RK3288_LVDS_CH0_REG2_LANE0_LVDS_MODE |
+			    RK3288_LVDS_PLL_FBDIV_REG2(0x46));
+		lvds_writel(priv, RK3288_LVDS_CH0_REG3,
+			    RK3288_LVDS_PLL_FBDIV_REG3(0x46));
+		lvds_writel(priv, RK3288_LVDS_CH0_REG4, 0x00);
+		lvds_writel(priv, RK3288_LVDS_CH0_REG5, 0x00);
+		lvds_writel(priv, RK3288_LVDS_CH0_REGD,
+			    RK3288_LVDS_PLL_PREDIV_REGD(0x0a));
+		lvds_writel(priv, RK3288_LVDS_CH0_REG20,
+			    RK3288_LVDS_CH0_REG20_LSB);
+	}
+
+	/* Power on */
+	writel(RK3288_LVDS_CFG_REGC_PLL_ENABLE,
+	       priv->regs + RK3288_LVDS_CFG_REGC);
+
+	writel(RK3288_LVDS_CFG_REG21_TX_ENABLE,
+	       priv->regs + RK3288_LVDS_CFG_REG21);
+
+	return 0;
+}
+
+int rk_lvds_read_timing(struct udevice *dev, struct display_timing *timing)
+{
+	if (fdtdec_decode_display_timing
+	    (gd->fdt_blob, dev->of_offset, 0, timing)) {
+		debug("%s: Failed to decode display timing\n", __func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int rk_lvds_ofdata_to_platdata(struct udevice *dev)
+{
+	struct rk_lvds_priv *priv = dev_get_priv(dev);
+	const void *blob = gd->fdt_blob;
+	int node = dev->of_offset;
+	int ret;
+	priv->regs = (void *)dev_get_addr(dev);
+	priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+
+	ret = fdtdec_get_int(blob, node, "rockchip,output", -1);
+	if (ret != -1) {
+		priv->output = ret;
+		debug("LVDS output : %d\n", ret);
+	} else {
+		/* default set it as output rgb */
+		priv->output = LVDS_OUTPUT_RGB;
+	}
+
+	ret = fdtdec_get_int(blob, node, "rockchip,data-mapping", -1);
+	if (ret != -1) {
+		priv->format = ret;
+		debug("LVDS data-mapping : %d\n", ret);
+	} else {
+		/* default set it as format jeida */
+		priv->format = LVDS_FORMAT_JEIDA;
+	}
+
+	ret = fdtdec_get_int(blob, node, "rockchip,data-width", -1);
+	if (ret != -1) {
+		debug("LVDS data-width : %d\n", ret);
+		if (ret == 24) {
+			priv->format |= LVDS_24BIT;
+		} else if (ret == 18) {
+			priv->format |= LVDS_18BIT;
+		} else {
+			debug("rockchip-lvds unsupport data-width[%d]\n", ret);
+			ret = -EINVAL;
+			return ret;
+		}
+	} else {
+		priv->format |= LVDS_24BIT;
+	}
+
+	return 0;
+}
+
+int rk_lvds_probe(struct udevice *dev)
+{
+	struct rk_lvds_priv *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev, "rockchip,panel",
+					   &priv->panel);
+	if (ret) {
+		debug("%s: Cannot find panel for '%s' (ret=%d)\n", __func__,
+		      dev->name, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dm_display_ops lvds_rockchip_ops = {
+	.read_timing = rk_lvds_read_timing,
+	.enable = rk_lvds_enable,
+};
+
+static const struct udevice_id rockchip_lvds_ids[] = {
+	{.compatible = "rockchip,rk3288-lvds"},
+	{}
+};
+
+U_BOOT_DRIVER(lvds_rockchip) = {
+	.name	= "lvds_rockchip",
+	.id	= UCLASS_DISPLAY,
+	.of_match = rockchip_lvds_ids,
+	.ops	= &lvds_rockchip_ops,
+	.ofdata_to_platdata	= rk_lvds_ofdata_to_platdata,
+	.probe	= rk_lvds_probe,
+	.priv_auto_alloc_size	= sizeof(struct rk_lvds_priv),
+};