[PATCH v10 19/21] drm/mediatek: Add mt8195 External DisplayPort support

[Guillaume Ranquet <granquet@xxxxxxxxxxxx>]

This patch adds External DisplayPort support to the mt8195 eDP driver.

Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 104 +++++++++++++++++++++++-------
 1 file changed, 81 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 8eb17ae82bfd..4789853ec5ff 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -164,6 +164,11 @@ static struct regmap_config mtk_dp_regmap_config = {
 	.name = "mtk-dp-registers",
 };
 
+static bool mtk_dp_is_edp(struct mtk_dp *mtk_dp)
+{
+	return mtk_dp->next_bridge;
+}
+
 static struct mtk_dp *mtk_dp_from_bridge(struct drm_bridge *b)
 {
 	return container_of(b, struct mtk_dp, bridge);
@@ -1054,26 +1059,49 @@ static int mtk_dp_get_calibration_data(struct mtk_dp *mtk_dp)
 	if (!cal_data->ln_tx_impsel_pmos)
 		return -ENOMEM;
 
-	cal_data->glb_bias_trim =
-		check_cal_data_valid(mtk_dp, 1, 0x1e, (buf[3] >> 27) & 0x1f, 0xf);
-	cal_data->clktx_impse =
-		check_cal_data_valid(mtk_dp, 1, 0xe, (buf[0] >> 9) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_pmos[0] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 28) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_nmos[0] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 24) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_pmos[1] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 20) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_nmos[1] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 16) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_pmos[2] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 12) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_nmos[2] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 8) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_pmos[3] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 4) & 0xf, 0x8);
-	cal_data->ln_tx_impsel_nmos[3] =
-		check_cal_data_valid(mtk_dp, 1, 0xe, buf[2] & 0xf, 0x8);
+	if (mtk_dp_is_edp(mtk_dp)) {
+		cal_data->glb_bias_trim =
+			check_cal_data_valid(mtk_dp, 1, 0x1e, (buf[3] >> 27) & 0x1f, 0xf);
+		cal_data->clktx_impse =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[0] >> 9) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[0] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 28) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[0] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 24) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[1] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 20) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[1] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 16) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[2] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 12) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[2] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 8) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[3] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[2] >> 4) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[3] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, buf[2] & 0xf, 0x8);
+	} else {
+		cal_data->glb_bias_trim =
+			check_cal_data_valid(mtk_dp, 1, 0x1e, (buf[0] >> 27) & 0x1f, 0xf);
+		cal_data->clktx_impse =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[0] >> 13) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[0] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[1] >> 28) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[0] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[1] >> 24) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[1] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[1] >> 20) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[1] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[1] >> 16) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[2] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[1] >> 12) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[2] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[1] >> 8) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_pmos[3] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, (buf[1] >> 4) & 0xf, 0x8);
+		cal_data->ln_tx_impsel_nmos[3] =
+			check_cal_data_valid(mtk_dp, 1, 0xe, buf[1] & 0xf, 0x8);
+	}
 
 	kfree(buf);
 
@@ -1224,7 +1252,10 @@ static void mtk_dp_video_mute(struct mtk_dp *mtk_dp, bool enable)
 			   VIDEO_MUTE_SEL_DP_ENC0_P0_MASK |
 			   VIDEO_MUTE_SW_DP_ENC0_P0_MASK);
 
-	mtk_dp_sip_atf_call(MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable);
+	if (mtk_dp_is_edp(mtk_dp))
+		mtk_dp_sip_atf_call(MTK_DP_SIP_ATF_EDP_VIDEO_UNMUTE, enable);
+	else
+		mtk_dp_sip_atf_call(MTK_DP_SIP_ATF_VIDEO_UNMUTE, enable);
 }
 
 static int mtk_dp_power_enable(struct mtk_dp *mtk_dp)
@@ -2066,6 +2097,24 @@ static int mtk_dp_dt_parse(struct mtk_dp *mtk_dp,
 	return ret;
 }
 
+static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
+{
+	struct mtk_dp *mtk_dp = mtk_dp_from_bridge(bridge);
+	enum drm_connector_status ret = connector_status_disconnected;
+	u8 sink_count = 0;
+
+	if (mtk_dp_is_edp(mtk_dp))
+		return connector_status_connected;
+
+	if (mtk_dp_plug_state(mtk_dp)) {
+		drm_dp_dpcd_readb(&mtk_dp->aux, DP_SINK_COUNT, &sink_count);
+		if (DP_GET_SINK_COUNT(sink_count))
+			ret = connector_status_connected;
+	}
+
+	return ret;
+}
+
 static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
 				    struct drm_connector *connector)
 {
@@ -2422,6 +2471,7 @@ static const struct drm_bridge_funcs mtk_dp_bridge_funcs = {
 	.atomic_disable = mtk_dp_bridge_atomic_disable,
 	.mode_valid = mtk_dp_bridge_mode_valid,
 	.get_edid = mtk_dp_get_edid,
+	.detect = mtk_dp_bdg_detect,
 };
 
 static int mtk_dp_probe(struct platform_device *pdev)
@@ -2443,7 +2493,11 @@ static int mtk_dp_probe(struct platform_device *pdev)
 
 
 	mtk_dp->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
-	if (IS_ERR(mtk_dp->next_bridge)) {
+	if (IS_ERR(mtk_dp->next_bridge) && PTR_ERR(mtk_dp->next_bridge) == -ENODEV) {
+		dev_info(dev,
+			 "No panel connected in devicetree, continuing as external DP\n");
+		mtk_dp->next_bridge = NULL;
+	} else if (IS_ERR(mtk_dp->next_bridge)) {
 		return dev_err_probe(dev, PTR_ERR(mtk_dp->next_bridge), "Failed to get bridge\n");
 	}
 
@@ -2488,7 +2542,10 @@ static int mtk_dp_probe(struct platform_device *pdev)
 	mtk_dp->bridge.ops =
 		DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
 	drm_bridge_add(&mtk_dp->bridge);
-	mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;
+	if (mtk_dp_is_edp(mtk_dp))
+		mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;
+	else
+		mtk_dp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
 
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);
@@ -2550,6 +2607,7 @@ static SIMPLE_DEV_PM_OPS(mtk_dp_pm_ops, mtk_dp_suspend, mtk_dp_resume);
 
 static const struct of_device_id mtk_dp_of_match[] = {
 	{ .compatible = "mediatek,mt8195-edp-tx" },
+	{ .compatible = "mediatek,mt8195-dp-tx" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, mtk_dp_of_match);
-- 
2.35.1