[PATCH 2/2] drm/msm/dsi: Add support for msm8x94

[Hai Li]

DSI controller on msm8x94 is version 1.3, which requires different
power supplies and works with 20nm DSI PHY. This change is to add
the basic support for this version.

Signed-off-by: Hai Li <hali@xxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/drm/msm/dsi.txt |   7 ++
 drivers/gpu/drm/msm/dsi/dsi.h                     |   1 +
 drivers/gpu/drm/msm/dsi/dsi_host.c                |  18 +++
 drivers/gpu/drm/msm/dsi/dsi_phy.c                 | 131 ++++++++++++++++++++++
 4 files changed, 157 insertions(+)

diff --git a/Documentation/devicetree/bindings/drm/msm/dsi.txt b/Documentation/devicetree/bindings/drm/msm/dsi.txt
index 4edd6fa..4309f0f 100644
--- a/Documentation/devicetree/bindings/drm/msm/dsi.txt
+++ b/Documentation/devicetree/bindings/drm/msm/dsi.txt
@@ -47,6 +47,7 @@ Required properties:
 - compatible: Could be the following
   * "qcom,dsi-phy-28nm-hpm"
   * "qcom,dsi-phy-28nm-lp"
+  * "qcom,dsi-phy-20nm"
 - reg: Physical base address and length of the registers of PLL, PHY and PHY
   regulator
 - reg-names: The names of register regions. The following regions are required:
@@ -62,6 +63,10 @@ Required properties:
   * "iface_clk"
 - vddio-supply: phandle to vdd-io regulator device node
 
+Optional properties:
+- qcom,dsi-phy-regulator-ldo-mode: Boolean value indicating if the LDO mode PHY
+  regulator is wanted.
+
 Example:
 	mdss_dsi0: qcom,mdss_dsi@fd922800 {
 		compatible = "qcom,mdss-dsi-ctrl";
@@ -124,4 +129,6 @@ Example:
 		clock-names = "iface_clk";
 		clocks = <&mmcc MDSS_AHB_CLK>;
 		vddio-supply = <&pma8084_l12>;
+
+		qcom,dsi-phy-regulator-ldo-mode;
 	};
diff --git a/drivers/gpu/drm/msm/dsi/dsi.h b/drivers/gpu/drm/msm/dsi/dsi.h
index 5e29aad..e18872a 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.h
+++ b/drivers/gpu/drm/msm/dsi/dsi.h
@@ -30,6 +30,7 @@
 enum msm_dsi_phy_type {
 	MSM_DSI_PHY_28NM_HPM,
 	MSM_DSI_PHY_28NM_LP,
+	MSM_DSI_PHY_20NM,
 	MSM_DSI_PHY_MAX
 };
 
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 69c1397..2d8f194 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -34,6 +34,7 @@
 #define MSM_DSI_6G_VER_MINOR_V1_1	0x10010000
 #define MSM_DSI_6G_VER_MINOR_V1_1_1	0x10010001
 #define MSM_DSI_6G_VER_MINOR_V1_2	0x10020000
+#define MSM_DSI_6G_VER_MINOR_V1_3	0x10030000
 #define MSM_DSI_6G_VER_MINOR_V1_3_1	0x10030001
 
 #define DSI_6G_REG_SHIFT	4
@@ -117,6 +118,23 @@ static const struct dsi_config dsi_cfgs[] = {
 			},
 		},
 	},
+	{ /* 8x94 */
+		.major = MSM_DSI_VER_MAJOR_6G,
+		.minor = MSM_DSI_6G_VER_MINOR_V1_3,
+		.io_offset = DSI_6G_REG_SHIFT,
+		.reg_cfg = {
+			.num = 7,
+			.regs = {
+				{"gdsc", -1, -1, -1, -1},
+				{"vdda", 1250000, 1250000, 100000, 100},
+				{"vddio", 1800000, 1800000, 100000, 100},
+				{"vcca", 1000000, 1000000, 10000, 100},
+				{"vdd", 1800000, 1800000, 100000, 100},
+				{"lab_reg", -1, -1, -1, -1},
+				{"ibb_reg", -1, -1, -1, -1},
+			},
+		}
+	},
 };
 
 static int dsi_get_version(const void __iomem *base, u32 *major, u32 *minor)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_phy.c b/drivers/gpu/drm/msm/dsi/dsi_phy.c
index 52b463e..bd37e61 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_phy.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_phy.c
@@ -66,6 +66,8 @@ struct msm_dsi_phy {
 	struct dsi_dphy_timing timing;
 	const struct dsi_phy_cfg *cfg;
 
+	bool regulator_ldo_mode;
+
 	struct msm_dsi_pll *pll;
 };
 
@@ -406,6 +408,115 @@ static int dsi_28nm_phy_disable(struct msm_dsi_phy *phy)
 	return 0;
 }
 
+static void dsi_20nm_phy_regulator_ctrl(struct msm_dsi_phy *phy, bool enable)
+{
+	void __iomem *base = phy->reg_base;
+
+	if (!enable) {
+		dsi_phy_write(base + REG_DSI_20nm_PHY_REGULATOR_CAL_PWR_CFG, 0);
+		return;
+	}
+
+	if (phy->regulator_ldo_mode) {
+		dsi_phy_write(phy->base + REG_DSI_20nm_PHY_LDO_CNTRL, 0x1d);
+		return;
+	}
+
+	/* non LDO mode */
+	dsi_phy_write(base + REG_DSI_20nm_PHY_REGULATOR_CTRL_1, 0x03);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_REGULATOR_CTRL_2, 0x03);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_REGULATOR_CTRL_3, 0x00);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_REGULATOR_CTRL_4, 0x20);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_REGULATOR_CAL_PWR_CFG, 0x01);
+	dsi_phy_write(phy->base + REG_DSI_20nm_PHY_LDO_CNTRL, 0x00);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_REGULATOR_CTRL_0, 0x03);
+}
+
+static int dsi_20nm_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
+		const unsigned long bit_rate, const unsigned long esc_rate)
+{
+	struct dsi_dphy_timing *timing = &phy->timing;
+	int i;
+	void __iomem *base = phy->base;
+	u32 cfg_4[4] = {0x20, 0x40, 0x20, 0x00};
+
+	DBG("");
+
+	if (dsi_dphy_timing_calc(timing, bit_rate, esc_rate)) {
+		pr_err("%s: D-PHY timing calculation failed\n", __func__);
+		return -EINVAL;
+	}
+
+	dsi_20nm_phy_regulator_ctrl(phy, true);
+
+	dsi_phy_write(base + REG_DSI_20nm_PHY_STRENGTH_0, 0xff);
+
+	dsi_phy_set_src_pll(phy, src_pll_id, REG_DSI_20nm_PHY_GLBL_TEST_CTRL);
+
+	for (i = 0; i < 4; i++) {
+		dsi_phy_write(base + REG_DSI_20nm_PHY_LN_CFG_3(i),
+							(i >> 1) * 0x40);
+		dsi_phy_write(base + REG_DSI_20nm_PHY_LN_TEST_STR_0(i), 0x01);
+		dsi_phy_write(base + REG_DSI_20nm_PHY_LN_TEST_STR_1(i), 0x46);
+		dsi_phy_write(base + REG_DSI_20nm_PHY_LN_CFG_0(i), 0x02);
+		dsi_phy_write(base + REG_DSI_20nm_PHY_LN_CFG_1(i), 0xa0);
+		dsi_phy_write(base + REG_DSI_20nm_PHY_LN_CFG_4(i), cfg_4[i]);
+	}
+
+	dsi_phy_write(base + REG_DSI_20nm_PHY_LNCK_CFG_3, 0x80);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_LNCK_TEST_STR0, 0x01);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_LNCK_TEST_STR1, 0x46);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_LNCK_CFG_0, 0x00);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_LNCK_CFG_1, 0xa0);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_LNCK_CFG_2, 0x00);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_LNCK_CFG_4, 0x00);
+
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_0,
+		DSI_20nm_PHY_TIMING_CTRL_0_CLK_ZERO(timing->clk_zero));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_1,
+		DSI_20nm_PHY_TIMING_CTRL_1_CLK_TRAIL(timing->clk_trail));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_2,
+		DSI_20nm_PHY_TIMING_CTRL_2_CLK_PREPARE(timing->clk_prepare));
+	if (timing->clk_zero & BIT(8))
+		dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_3,
+			DSI_20nm_PHY_TIMING_CTRL_3_CLK_ZERO_8);
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_4,
+		DSI_20nm_PHY_TIMING_CTRL_4_HS_EXIT(timing->hs_exit));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_5,
+		DSI_20nm_PHY_TIMING_CTRL_5_HS_ZERO(timing->hs_zero));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_6,
+		DSI_20nm_PHY_TIMING_CTRL_6_HS_PREPARE(timing->hs_prepare));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_7,
+		DSI_20nm_PHY_TIMING_CTRL_7_HS_TRAIL(timing->hs_trail));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_8,
+		DSI_20nm_PHY_TIMING_CTRL_8_HS_RQST(timing->hs_rqst));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_9,
+		DSI_20nm_PHY_TIMING_CTRL_9_TA_GO(timing->ta_go) |
+		DSI_20nm_PHY_TIMING_CTRL_9_TA_SURE(timing->ta_sure));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_10,
+		DSI_20nm_PHY_TIMING_CTRL_10_TA_GET(timing->ta_get));
+	dsi_phy_write(base + REG_DSI_20nm_PHY_TIMING_CTRL_11,
+		DSI_20nm_PHY_TIMING_CTRL_11_TRIG3_CMD(0));
+
+	dsi_phy_write(base + REG_DSI_20nm_PHY_CTRL_1, 0x00);
+
+	dsi_phy_write(base + REG_DSI_20nm_PHY_STRENGTH_1, 0x06);
+
+	/* make sure everything is written before enable */
+	wmb();
+	dsi_phy_write(base + REG_DSI_20nm_PHY_CTRL_0, 0x7f);
+
+	return 0;
+}
+
+static int dsi_20nm_phy_disable(struct msm_dsi_phy *phy)
+{
+	dsi_phy_write(phy->base + REG_DSI_20nm_PHY_CTRL_0, 0);
+	dsi_20nm_phy_regulator_ctrl(phy, false);
+
+	return 0;
+}
+
 static int dsi_phy_enable_resource(struct msm_dsi_phy *phy)
 {
 	int ret;
@@ -456,6 +567,21 @@ static const struct dsi_phy_cfg dsi_phy_cfgs[MSM_DSI_PHY_MAX] = {
 			.disable = dsi_28nm_phy_disable,
 		}
 	},
+	[MSM_DSI_PHY_20NM] = {
+		.type = MSM_DSI_PHY_20NM,
+		.src_pll_truthtable = { {false, true}, {false, true} },
+		.reg_cfg = {
+			.num = 2,
+			.regs = {
+				{"vddio", 1800000, 1800000, 100000, 100},
+				{"vcca", 1000000, 1000000, 10000, 100},
+			},
+		},
+		.ops = {
+			.enable = dsi_20nm_phy_enable,
+			.disable = dsi_20nm_phy_disable,
+		}
+	},
 };
 
 static const struct of_device_id dsi_phy_dt_match[] = {
@@ -463,6 +589,8 @@ static const struct of_device_id dsi_phy_dt_match[] = {
 	  .data = &dsi_phy_cfgs[MSM_DSI_PHY_28NM_HPM],},
 	{ .compatible = "qcom,dsi-phy-28nm-lp",
 	  .data = &dsi_phy_cfgs[MSM_DSI_PHY_28NM_LP],},
+	{ .compatible = "qcom,dsi-phy-20nm",
+	  .data = &dsi_phy_cfgs[MSM_DSI_PHY_20NM],},
 	{}
 };
 
@@ -492,6 +620,9 @@ static int dsi_phy_driver_probe(struct platform_device *pdev)
 		goto fail;
 	}
 
+	phy->regulator_ldo_mode = of_property_read_bool(pdev->dev.of_node,
+				"qcom,dsi-phy-regulator-ldo-mode");
+
 	phy->base = msm_ioremap(pdev, "dsi_phy", "DSI_PHY");
 	if (IS_ERR(phy->base)) {
 		dev_err(&pdev->dev, "%s: failed to map phy base\n", __func__);
-- 
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