[PATCH v9 19/22] drm/mediatek: Add mt8195 External DisplayPort support

Guillaume Ranquet
2022-03-27T22:51:53Z

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

Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
---
drivers/gpu/drm/mediatek/mtk_dp.c | 301 +++++++++++++++++++++++++++---
1 file changed, 278 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 7cd8459cf719..9e532408f12e 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -176,6 +176,11 @@ struct mtk_dp {
struct drm_connector *conn;
};

+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);
@@ -741,6 +746,47 @@ static int mtk_dp_fec_enable(struct mtk_dp *mtk_dp, bool enable)
FEC_EN_DP_TRANS_P0_MASK);
}

+static u32 mtk_dp_swirq_get_clear(struct mtk_dp *mtk_dp)
+{
+ int ret;
+
+ u32 irq_status = mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_35D0) &
+ SW_IRQ_FINAL_STATUS_DP_TRANS_P0_MASK;
+
+ if (irq_status) {
+ MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_35C8, irq_status,
+ SW_IRQ_CLR_DP_TRANS_P0_MASK, ret, out);
+ MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_35C8, 0,
+ SW_IRQ_CLR_DP_TRANS_P0_MASK, ret, out);
+ }
+
+ return irq_status;
+
+out:
+ return ret;
+}
+
+static u32 mtk_dp_hwirq_get_clear(struct mtk_dp *mtk_dp)
+{
+ int ret;
+
+ u8 irq_status = (mtk_dp_read(mtk_dp, MTK_DP_TRANS_P0_3418) &
+ IRQ_STATUS_DP_TRANS_P0_MASK) >>
+ IRQ_STATUS_DP_TRANS_P0_SHIFT;
+
+ if (irq_status) {
+ MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_3418, irq_status,
+ IRQ_CLR_DP_TRANS_P0_MASK, ret, out);
+ MTK_UPD_BITS_OR_OUT(mtk_dp, MTK_DP_TRANS_P0_3418, 0,
+ IRQ_CLR_DP_TRANS_P0_MASK, ret, out);
+ }
+
+ return irq_status;
+
+out:
+ return ret;
+}
+
static int mtk_dp_hwirq_enable(struct mtk_dp *mtk_dp, bool enable)
{
u32 val = 0;
@@ -932,26 +978,49 @@ 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[3] >> 27) & 0x1f, 0xf);
- cal_data->clktx_impse =
- check_cal_data_valid(1, 0xe, (buf[0] >> 9) & 0xf, 0x8);
- cal_data->ln_tx_impsel_pmos[0] =
- check_cal_data_valid(1, 0xe, (buf[2] >> 28) & 0xf, 0x8);
- cal_data->ln_tx_impsel_nmos[0] =
- check_cal_data_valid(1, 0xe, (buf[2] >> 24) & 0xf, 0x8);
- cal_data->ln_tx_impsel_pmos[1] =
- check_cal_data_valid(1, 0xe, (buf[2] >> 20) & 0xf, 0x8);
- cal_data->ln_tx_impsel_nmos[1] =
- check_cal_data_valid(1, 0xe, (buf[2] >> 16) & 0xf, 0x8);
- cal_data->ln_tx_impsel_pmos[2] =
- check_cal_data_valid(1, 0xe, (buf[2] >> 12) & 0xf, 0x8);
- cal_data->ln_tx_impsel_nmos[2] =
- check_cal_data_valid(1, 0xe, (buf[2] >> 8) & 0xf, 0x8);
- cal_data->ln_tx_impsel_pmos[3] =
- check_cal_data_valid(1, 0xe, (buf[2] >> 4) & 0xf, 0x8);
- cal_data->ln_tx_impsel_nmos[3] =
- check_cal_data_valid(1, 0xe, buf[2] & 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->ln_tx_impsel_pmos[0] =
+ check_cal_data_valid(1, 0xe, (buf[2] >> 28) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_nmos[0] =
+ check_cal_data_valid(1, 0xe, (buf[2] >> 24) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_pmos[1] =
+ check_cal_data_valid(1, 0xe, (buf[2] >> 20) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_nmos[1] =
+ check_cal_data_valid(1, 0xe, (buf[2] >> 16) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_pmos[2] =
+ check_cal_data_valid(1, 0xe, (buf[2] >> 12) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_nmos[2] =
+ check_cal_data_valid(1, 0xe, (buf[2] >> 8) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_pmos[3] =
+ check_cal_data_valid(1, 0xe, (buf[2] >> 4) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_nmos[3] =
+ 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->ln_tx_impsel_pmos[0] =
+ check_cal_data_valid(1, 0xe, (buf[1] >> 28) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_nmos[0] =
+ check_cal_data_valid(1, 0xe, (buf[1] >> 24) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_pmos[1] =
+ check_cal_data_valid(1, 0xe, (buf[1] >> 20) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_nmos[1] =
+ check_cal_data_valid(1, 0xe, (buf[1] >> 16) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_pmos[2] =
+ check_cal_data_valid(1, 0xe, (buf[1] >> 12) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_nmos[2] =
+ check_cal_data_valid(1, 0xe, (buf[1] >> 8) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_pmos[3] =
+ check_cal_data_valid(1, 0xe, (buf[1] >> 4) & 0xf, 0x8);
+ cal_data->ln_tx_impsel_nmos[3] =
+ check_cal_data_valid(1, 0xe, buf[1] & 0xf, 0x8);
+ }

kfree(buf);

@@ -1080,7 +1149,10 @@ 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)
@@ -1195,6 +1267,57 @@ static void mtk_dp_set_tx_out(struct mtk_dp *mtk_dp)
mtk_dp_setup_tu(mtk_dp);
}

+static void mtk_dp_edid_free(struct mtk_dp *mtk_dp)
+{
+ mutex_lock(&mtk_dp->edid_lock);
+ kfree(mtk_dp->edid);
+ mtk_dp->edid = NULL;
+ mutex_unlock(&mtk_dp->edid_lock);
+}
+
+static int mtk_dp_hpd_sink_event(struct mtk_dp *mtk_dp)
+{
+ ssize_t ret;
+ u8 sink_count;
+ bool locked;
+ u8 link_status[DP_LINK_STATUS_SIZE] = {};
+ u32 sink_count_reg = DP_SINK_COUNT_ESI;
+ u32 link_status_reg = DP_LANE0_1_STATUS;
+
+ ret = drm_dp_dpcd_readb(&mtk_dp->aux, sink_count_reg, &sink_count);
+ if (ret < 0) {
+ drm_err(mtk_dp->drm_dev, "Read sink count failed: %ld\n", ret);
+ return ret;
+ }
+
+ ret = drm_dp_dpcd_read(&mtk_dp->aux, link_status_reg, link_status,
+ sizeof(link_status));
+ if (!ret) {
+ drm_err(mtk_dp->drm_dev, "Read link status failed: %ld\n",
+ ret);
+ return ret;
+ }
+
+ locked = drm_dp_channel_eq_ok(link_status,
+ mtk_dp->train_info.lane_count);
+ if (!locked && mtk_dp->train_state > MTK_DP_TRAIN_STATE_TRAINING_PRE)
+ mtk_dp->train_state = MTK_DP_TRAIN_STATE_TRAINING_PRE;
+
+ if (link_status[1] & DP_REMOTE_CONTROL_COMMAND_PENDING)
+ drm_dp_dpcd_writeb(&mtk_dp->aux, DP_DEVICE_SERVICE_IRQ_VECTOR,
+ DP_REMOTE_CONTROL_COMMAND_PENDING);
+
+ if (DP_GET_SINK_COUNT(sink_count) &&
+ (link_status[2] & DP_DOWNSTREAM_PORT_STATUS_CHANGED)) {
+ mtk_dp_edid_free(mtk_dp);
+ mtk_dp->train_info.check_cap_count = 0;
+ mtk_dp->train_state = MTK_DP_TRAIN_STATE_CHECKEDID;
+ msleep(20);
+ }
+
+ return 0;
+}
+
static void mtk_dp_train_update_swing_pre(struct mtk_dp *mtk_dp, int lanes,
u8 dpcd_adjust_req[2])
{
@@ -1677,6 +1800,115 @@ static void mtk_dp_init_port(struct mtk_dp *mtk_dp)
mtk_dp_digital_sw_reset(mtk_dp);
}

+static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev)
+{
+ struct mtk_dp *mtk_dp = dev;
+ int event;
+ u8 buf[DP_RECEIVER_CAP_SIZE] = {};
+
+ event = mtk_dp_plug_state(mtk_dp) ? connector_status_connected :
+ connector_status_disconnected;
+
+ if (event < 0)
+ return IRQ_HANDLED;
+
+ if (mtk_dp->drm_dev) {
+ dev_info(mtk_dp->dev, "drm_helper_hpd_irq_event\n");
+ drm_helper_hpd_irq_event(mtk_dp->bridge.dev);
+ }
+
+ if (mtk_dp->train_info.cable_state_change) {
+ mtk_dp->train_info.cable_state_change = false;
+
+ mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
+
+ if (!mtk_dp->train_info.cable_plugged_in ||
+ !mtk_dp_plug_state(mtk_dp)) {
+ mtk_dp_video_mute(mtk_dp, true);
+
+ mtk_dp_initialize_priv_data(mtk_dp);
+ mtk_dp_set_idle_pattern(mtk_dp, true);
+ if (mtk_dp->has_fec)
+ mtk_dp_fec_enable(mtk_dp, false);
+
+ mtk_dp_edid_free(mtk_dp);
+ mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+ DP_PWR_STATE_BANDGAP_TPLL,
+ DP_PWR_STATE_MASK);
+ } else {
+ mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+ DP_PWR_STATE_BANDGAP_TPLL_LANE,
+ DP_PWR_STATE_MASK);
+ drm_dp_read_dpcd_caps(&mtk_dp->aux, buf);
+ mtk_dp->train_info.link_rate =
+ min_t(int, MTK_DP_MAX_LINK_RATE,
+ buf[DP_MAX_LINK_RATE]);
+ mtk_dp->train_info.lane_count =
+ min_t(int, MTK_DP_MAX_LANES,
+ drm_dp_max_lane_count(buf));
+ }
+ }
+
+ if (mtk_dp->train_info.irq_status & MTK_DP_HPD_INTERRUPT) {
+ dev_dbg(mtk_dp->dev, "MTK_DP_HPD_INTERRUPT\n");
+ mtk_dp->train_info.irq_status &= ~MTK_DP_HPD_INTERRUPT;
+ mtk_dp_hpd_sink_event(mtk_dp);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t mtk_dp_hpd_isr_handler(struct mtk_dp *mtk_dp)
+{
+ bool connected;
+ u16 swirq_status = mtk_dp_swirq_get_clear(mtk_dp);
+ u8 hwirq_status = mtk_dp_hwirq_get_clear(mtk_dp);
+ struct mtk_dp_train_info *train_info = &mtk_dp->train_info;
+
+ train_info->irq_status |= hwirq_status | swirq_status;
+
+ if (!train_info->irq_status)
+ return IRQ_HANDLED;
+
+ connected = mtk_dp_plug_state(mtk_dp);
+ if (connected || !train_info->cable_plugged_in)
+ train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT;
+ else if (!connected || train_info->cable_plugged_in)
+ train_info->irq_status &= ~MTK_DP_HPD_CONNECT;
+
+ if (!(train_info->irq_status &
+ (MTK_DP_HPD_CONNECT | MTK_DP_HPD_DISCONNECT)))
+ return IRQ_HANDLED;
+
+ if (train_info->irq_status & MTK_DP_HPD_CONNECT) {
+ train_info->irq_status &= ~MTK_DP_HPD_CONNECT;
+ train_info->cable_plugged_in = true;
+ } else {
+ train_info->irq_status &= ~MTK_DP_HPD_DISCONNECT;
+ train_info->cable_plugged_in = false;
+ mtk_dp->train_state = MTK_DP_TRAIN_STATE_STARTUP;
+ }
+ train_info->cable_state_change = true;
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t mtk_dp_hpd_event(int hpd, void *dev)
+{
+ struct mtk_dp *mtk_dp = dev;
+ u32 irq_status;
+
+ irq_status = mtk_dp_read(mtk_dp, MTK_DP_TOP_IRQ_STATUS);
+
+ if (!irq_status)
+ return IRQ_HANDLED;
+
+ if (irq_status & RGS_IRQ_STATUS_TRANSMITTER)
+ return mtk_dp_hpd_isr_handler(mtk_dp);
+
+ return IRQ_HANDLED;
+}
+
static int mtk_dp_dt_parse(struct mtk_dp *mtk_dp,
struct platform_device *pdev)
{
@@ -2110,6 +2342,7 @@ static int mtk_dp_probe(struct platform_device *pdev)
struct mtk_dp *mtk_dp;
struct device *dev = &pdev->dev;
int ret;
+ int irq_num = 0;

mtk_dp = devm_kzalloc(dev, sizeof(*mtk_dp), GFP_KERNEL);
if (!mtk_dp)
@@ -2117,9 +2350,18 @@ static int mtk_dp_probe(struct platform_device *pdev)

mtk_dp->dev = dev;

+ irq_num = platform_get_irq(pdev, 0);
+ if (irq_num < 0)
+ return dev_err_probe(dev, irq_num, "failed to request dp irq resource\n");
+
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");
+ }

ret = mtk_dp_dt_parse(mtk_dp, pdev);
if (ret)
@@ -2129,6 +2371,13 @@ static int mtk_dp_probe(struct platform_device *pdev)
mtk_dp->aux.name = "aux_mtk_dp";
mtk_dp->aux.transfer = mtk_dp_aux_transfer;

+ ret = devm_request_threaded_irq(dev, irq_num, mtk_dp_hpd_event,
+ mtk_dp_hpd_event_thread,
+ IRQ_TYPE_LEVEL_HIGH, dev_name(dev),
+ mtk_dp);
+ if (ret)
+ return dev_err_probe(dev, -EPROBE_DEFER, "failed to request mediatek dptx irq\n");
+
mutex_init(&mtk_dp->dp_lock);
mutex_init(&mtk_dp->edid_lock);

@@ -2145,8 +2394,13 @@ static int mtk_dp_probe(struct platform_device *pdev)
mtk_dp->bridge.of_node = dev->of_node;
mtk_dp->bridge.type = DRM_MODE_CONNECTOR_eDP;

- mtk_dp->bridge.ops = DRM_BRIDGE_OP_EDID;
+ mtk_dp->bridge.ops =
+ DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
drm_bridge_add(&mtk_dp->bridge);
+ 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);
@@ -2201,6 +2455,7 @@ 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);
--
2.34.1