[patch 2/8] RFC: drivers/video/rockchip/rk_edp.c: Add rk3399 support

[Arnaud Patard (Rtp) <arnaud.patard@rtp-net.org>]

According to linux commit "drm/rockchip: analogix_dp: add rk3399 eDP
support" (82872e42bb1501dd9e60ca430f4bae45a469aa64), rk3288 and rk3399
eDP IPs are nearly the same, the difference is in the grf register
(SOC_CON6 versus SOC_CON20). So, change the code to use the right
register on each IP.

The clocks don't seem to be the same, the eDP clock is not at index 1
on rk3399, so don't try changing the clock at index 1 to rate 0 on
rk3399.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Index: u-boot/drivers/video/rockchip/rk_edp.c
===================================================================
--- u-boot.orig/drivers/video/rockchip/rk_edp.c
+++ u-boot/drivers/video/rockchip/rk_edp.c
@@ -17,11 +17,10 @@
 #include <asm/gpio.h>
 #include <asm/io.h>
 #include <asm/arch-rockchip/clock.h>
+#include <asm/arch-rockchip/hardware.h>
 #include <asm/arch-rockchip/edp_rk3288.h>
 #include <asm/arch-rockchip/grf_rk3288.h>
-#include <asm/arch-rockchip/hardware.h>
-#include <dt-bindings/clock/rk3288-cru.h>
-#include <linux/delay.h>
+#include <asm/arch-rockchip/grf_rk3399.h>
 
 #define MAX_CR_LOOP 5
 #define MAX_EQ_LOOP 5
@@ -37,18 +36,42 @@ static const char * const pre_emph_names
 #define DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_1200
 #define DP_PRE_EMPHASIS_MAX    DP_TRAIN_PRE_EMPHASIS_9_5
 
+#define RK3288_GRF_SOC_CON6	0x025c
+#define RK3288_GRF_SOC_CON12	0x0274
+#define RK3399_GRF_SOC_CON20	0x6250
+#define RK3399_GRF_SOC_CON25	0x6264
+
+enum rockchip_dp_types {
+	RK3288_DP = 0,
+	RK3399_EDP
+};
+
+struct rockchip_dp_data {
+	unsigned long reg_vop_big_little;
+	unsigned long reg_vop_big_little_sel;
+	unsigned long reg_ref_clk_sel;
+	unsigned long ref_clk_sel_bit;
+	enum rockchip_dp_types chip_type;
+};
+
 struct rk_edp_priv {
 	struct rk3288_edp *regs;
-	struct rk3288_grf *grf;
+	void *grf;
 	struct udevice *panel;
 	struct link_train link_train;
 	u8 train_set[4];
 };
 
-static void rk_edp_init_refclk(struct rk3288_edp *regs)
+static void rk_edp_init_refclk(struct rk3288_edp *regs, enum rockchip_dp_types chip_type)
 {
 	writel(SEL_24M, &regs->analog_ctl_2);
-	writel(REF_CLK_24M, &regs->pll_reg_1);
+	u32 reg;
+
+	reg = REF_CLK_24M;
+	if (chip_type == RK3288_DP)
+		reg ^= REF_CLK_MASK;
+	writel(reg, &regs->pll_reg_1);
+
 
 	writel(LDO_OUTPUT_V_SEL_145 | KVCO_DEFALUT | CHG_PUMP_CUR_SEL_5US |
 	       V2L_CUR_SEL_1MA, &regs->pll_reg_2);
@@ -1023,6 +1046,8 @@ static int rk_edp_probe(struct udevice *
 	struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
 	struct rk_edp_priv *priv = dev_get_priv(dev);
 	struct rk3288_edp *regs = priv->regs;
+	struct rockchip_dp_data *edp_data = (struct rockchip_dp_data *)dev_get_driver_data(dev);
+
 	struct clk clk;
 	int ret;
 
@@ -1037,16 +1062,17 @@ static int rk_edp_probe(struct udevice *
 	int vop_id = uc_plat->source_id;
 	debug("%s, uc_plat=%p, vop_id=%u\n", __func__, uc_plat, vop_id);
 
-	ret = clk_get_by_index(dev, 1, &clk);
-	if (ret >= 0) {
-		ret = clk_set_rate(&clk, 0);
-		clk_free(&clk);
-	}
-	if (ret) {
-		debug("%s: Failed to set EDP clock: ret=%d\n", __func__, ret);
-		return ret;
+	if (edp_data->chip_type == RK3288_DP) {
+		ret = clk_get_by_index(dev, 1, &clk);
+		if (ret >= 0) {
+			ret = clk_set_rate(&clk, 0);
+			clk_free(&clk);
+		}
+		if (ret) {
+			debug("%s: Failed to set EDP clock: ret=%d\n", __func__, ret);
+			return ret;
+		}
 	}
-
 	ret = clk_get_by_index(uc_plat->src_dev, 0, &clk);
 	if (ret >= 0) {
 		ret = clk_set_rate(&clk, 192000000);
@@ -1059,15 +1085,17 @@ static int rk_edp_probe(struct udevice *
 	}
 
 	/* grf_edp_ref_clk_sel: from internal 24MHz or 27MHz clock */
-	rk_setreg(&priv->grf->soc_con12, 1 << 4);
+	rk_setreg(priv->grf + edp_data->reg_ref_clk_sel,
+		  edp_data->ref_clk_sel_bit);
 
 	/* select epd signal from vop0 or vop1 */
-	rk_clrsetreg(&priv->grf->soc_con6, (1 << 5),
-	    (vop_id == 1) ? (1 << 5) : (0 << 5));
+	rk_clrsetreg(priv->grf + edp_data->reg_vop_big_little,
+		     edp_data->reg_vop_big_little_sel,
+		     (vop_id == 1) ? edp_data->reg_vop_big_little_sel : 0);
 
 	rockchip_edp_wait_hpd(priv);
 
-	rk_edp_init_refclk(regs);
+	rk_edp_init_refclk(regs, edp_data->chip_type);
 	rk_edp_init_interrupt(regs);
 	rk_edp_enable_sw_function(regs);
 	ret = rk_edp_init_analog_func(regs);
@@ -1083,8 +1111,25 @@ static const struct dm_display_ops dp_ro
 	.enable = rk_edp_enable,
 };
 
+static const struct rockchip_dp_data rk3399_edp = {
+	.reg_vop_big_little = RK3399_GRF_SOC_CON20,
+	.reg_vop_big_little_sel = BIT(5),
+	.reg_ref_clk_sel = RK3399_GRF_SOC_CON25,
+	.ref_clk_sel_bit = BIT(11),
+	.chip_type = RK3399_EDP,
+};
+
+static const struct rockchip_dp_data rk3288_dp = {
+	.reg_vop_big_little = RK3288_GRF_SOC_CON6,
+	.reg_vop_big_little_sel = BIT(5),
+	.reg_ref_clk_sel = RK3288_GRF_SOC_CON12,
+	.ref_clk_sel_bit = BIT(4),
+	.chip_type = RK3288_DP,
+};
+
 static const struct udevice_id rockchip_dp_ids[] = {
-	{ .compatible = "rockchip,rk3288-edp" },
+	{ .compatible = "rockchip,rk3288-edp", .data = (ulong)&rk3288_dp },
+	{ .compatible = "rockchip,rk3399-edp", .data = (ulong)&rk3399_edp },
 	{ }
 };
 
Index: u-boot/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
===================================================================
--- u-boot.orig/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
+++ u-boot/arch/arm/include/asm/arch-rockchip/edp_rk3288.h
@@ -232,8 +232,9 @@ check_member(rk3288_edp, pll_reg_5, 0xa0
 #define PD_CH0					(0x1 << 0)
 
 /* pll_reg_1 */
-#define REF_CLK_24M				(0x1 << 1)
-#define REF_CLK_27M				(0x0 << 1)
+#define REF_CLK_24M				(0x1 << 0)
+#define REF_CLK_27M				(0x0 << 0)
+#define REF_CLK_MASK				(0x1 << 0)
 
 /* line_map */
 #define LANE3_MAP_LOGIC_LANE_0			(0x0 << 6)