[PATCH v7 8/8] drm/mediatek: Add mt8195 eDP support

[Guillaume Ranquet <granquet@xxxxxxxxxxxx>]

This adds support of eDP panel to the mt8195 DP driver.

This driver is based on an initial version by
Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>.

Signed-off-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 102 +++++++++++++++++++++---------
 1 file changed, 73 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 41e95a0bcaa2c..a256d55346a23 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -228,6 +228,11 @@ 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);
@@ -1185,26 +1190,49 @@ static int mtk_dp_get_calibration_data(struct mtk_dp *mtk_dp)
 		return PTR_ERR(buf);
 	}
 
-	cal_data->glb_bias_trim =
-		check_cal_data_valid(1, 0x1e, (buf[0] >> 27) & 0x1f, 0xf);
-	cal_data->clktx_impse =
-		check_cal_data_valid(1, 0xe, (buf[0] >> 13) & 0xf, 0x8);
-	cal_data->ln0_tx_impsel_pmos =
-		check_cal_data_valid(1, 0xe, (buf[1] >> 28) & 0xf, 0x8);
-	cal_data->ln0_tx_impsel_nmos =
-		check_cal_data_valid(1, 0xe, (buf[1] >> 24) & 0xf, 0x8);
-	cal_data->ln1_tx_impsel_pmos =
-		check_cal_data_valid(1, 0xe, (buf[1] >> 20) & 0xf, 0x8);
-	cal_data->ln1_tx_impsel_nmos =
-		check_cal_data_valid(1, 0xe, (buf[1] >> 16) & 0xf, 0x8);
-	cal_data->ln2_tx_impsel_pmos =
-		check_cal_data_valid(1, 0xe, (buf[1] >> 12) & 0xf, 0x8);
-	cal_data->ln2_tx_impsel_nmos =
-		check_cal_data_valid(1, 0xe, (buf[1] >> 8) & 0xf, 0x8);
-	cal_data->ln3_tx_impsel_pmos =
-		check_cal_data_valid(1, 0xe, (buf[1] >> 4) & 0xf, 0x8);
-	cal_data->ln3_tx_impsel_nmos =
-		check_cal_data_valid(1, 0xe, buf[1] & 0xf, 0x8);
+	if (mtk_dp_is_edp(mtk_dp)) {
+		cal_data->glb_bias_trim =
+			check_cal_data_valid(1, 0x1e, (buf[3] >> 27) & 0x1f, 0xf);
+		cal_data->clktx_impse =
+			check_cal_data_valid(1, 0xe, (buf[0] >> 9) & 0xf, 0x8);
+		cal_data->ln0_tx_impsel_pmos =
+			check_cal_data_valid(1, 0xe, (buf[2] >> 28) & 0xf, 0x8);
+		cal_data->ln0_tx_impsel_nmos =
+			check_cal_data_valid(1, 0xe, (buf[2] >> 24) & 0xf, 0x8);
+		cal_data->ln1_tx_impsel_pmos =
+			check_cal_data_valid(1, 0xe, (buf[2] >> 20) & 0xf, 0x8);
+		cal_data->ln1_tx_impsel_nmos =
+			check_cal_data_valid(1, 0xe, (buf[2] >> 16) & 0xf, 0x8);
+		cal_data->ln2_tx_impsel_pmos =
+			check_cal_data_valid(1, 0xe, (buf[2] >> 12) & 0xf, 0x8);
+		cal_data->ln2_tx_impsel_nmos =
+			check_cal_data_valid(1, 0xe, (buf[2] >> 8) & 0xf, 0x8);
+		cal_data->ln3_tx_impsel_pmos =
+			check_cal_data_valid(1, 0xe, (buf[2] >> 4) & 0xf, 0x8);
+		cal_data->ln3_tx_impsel_nmos =
+			check_cal_data_valid(1, 0xe, buf[2] & 0xf, 0x8);
+	} else {
+		cal_data->glb_bias_trim =
+			check_cal_data_valid(1, 0x1e, (buf[0] >> 27) & 0x1f, 0xf);
+		cal_data->clktx_impse =
+			check_cal_data_valid(1, 0xe, (buf[0] >> 13) & 0xf, 0x8);
+		cal_data->ln0_tx_impsel_pmos =
+			check_cal_data_valid(1, 0xe, (buf[1] >> 28) & 0xf, 0x8);
+		cal_data->ln0_tx_impsel_nmos =
+			check_cal_data_valid(1, 0xe, (buf[1] >> 24) & 0xf, 0x8);
+		cal_data->ln1_tx_impsel_pmos =
+			check_cal_data_valid(1, 0xe, (buf[1] >> 20) & 0xf, 0x8);
+		cal_data->ln1_tx_impsel_nmos =
+			check_cal_data_valid(1, 0xe, (buf[1] >> 16) & 0xf, 0x8);
+		cal_data->ln2_tx_impsel_pmos =
+			check_cal_data_valid(1, 0xe, (buf[1] >> 12) & 0xf, 0x8);
+		cal_data->ln2_tx_impsel_nmos =
+			check_cal_data_valid(1, 0xe, (buf[1] >> 8) & 0xf, 0x8);
+		cal_data->ln3_tx_impsel_pmos =
+			check_cal_data_valid(1, 0xe, (buf[1] >> 4) & 0xf, 0x8);
+		cal_data->ln3_tx_impsel_nmos =
+			check_cal_data_valid(1, 0xe, buf[1] & 0xf, 0x8);
+	}
 
 	kfree(buf);
 
@@ -1322,7 +1350,11 @@ static void mtk_dp_video_mute(struct mtk_dp *mtk_dp, bool enable)
 	mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_3000, val,
 			   VIDEO_MUTE_SEL_DP_ENC0_P0_MASK |
 			   VIDEO_MUTE_SW_DP_ENC0_P0_MASK);
-	mtk_dp_sip_atf_call(MTK_DP_SIP_ATF_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 void mtk_dp_audio_mute(struct mtk_dp *mtk_dp, bool mute)
@@ -2326,6 +2358,9 @@ static enum drm_connector_status mtk_dp_bdg_detect(struct drm_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))
@@ -2888,7 +2923,11 @@ 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)) {
 		ret = PTR_ERR(mtk_dp->next_bridge);
 		dev_err_probe(dev, ret, "Failed to get bridge\n");
 		return ret;
@@ -2915,12 +2954,14 @@ static int mtk_dp_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, mtk_dp);
 
-	mutex_init(&mtk_dp->update_plugged_status_lock);
-	ret = mtk_dp_register_audio_driver(dev);
-	if (ret) {
-		dev_err(dev, "Failed to register audio driver: %d\n",
-			ret);
-		return ret;
+	if (!mtk_dp_is_edp(mtk_dp)) {
+		mutex_init(&mtk_dp->update_plugged_status_lock);
+		ret = mtk_dp_register_audio_driver(dev);
+		if (ret) {
+			dev_err(dev, "Failed to register audio driver: %d\n",
+				ret);
+			return ret;
+		}
 	}
 
 	mtk_dp->phy_dev = platform_device_register_data(dev, "mediatek-dp-phy",
@@ -2944,7 +2985,10 @@ static int mtk_dp_probe(struct platform_device *pdev)
 
 	mtk_dp->bridge.funcs = &mtk_dp_bridge_funcs;
 	mtk_dp->bridge.of_node = dev->of_node;
-	mtk_dp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
+	if (mtk_dp_is_edp(mtk_dp))
+		mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;
+	else
+		mtk_dp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
 
 	mtk_dp->bridge.ops =
 		DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
-- 
2.32.0