Hi, Bo-Chen:

On Tue, 2022-07-12 at 19:12 +0800, Bo-Chen Chen wrote:

From: Markus Schneider-Pargmann <msp@baylibre.com>

This patch adds a embedded displayport driver for the MediaTek mt8195
SoC.

It supports the MT8195, the embedded DisplayPort units. It offers
DisplayPort 1.4 with up to 4 lanes.

The driver creates a child device for the phy. The child device will
never exist without the parent being active. As they are sharing a
register range, the parent passes a regmap pointer to the child so
that
both can work with the same register range. The phy driver sets
device
data that is read by the parent to get the phy device that can be
used
to control the phy properties.

This driver is based on an initial version by
Jitao shi [off-list ref]

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Signed-off-by: Guillaume Ranquet <redacted>
Signed-off-by: Bo-Chen Chen <redacted>
---

[snip]

+
+static irqreturn_t mtk_dp_hpd_event_thread(int hpd, void *dev)
+{
+	struct mtk_dp *mtk_dp = dev;
+
+	if (mtk_dp->train_info.cable_state_change) {
+		mtk_dp->train_info.cable_state_change = false;
+
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
+				   DP_PWR_STATE_MASK);

You set cable_state_change to true in isr handler just to update a
register in isr thread. I think you could just update this register in
isr handler and drop cable_state_change.

Regards,
CK

+	}
+
+	if (mtk_dp->train_info.irq_sta.hpd_inerrupt) {
+		dev_dbg(mtk_dp->dev, "MTK_DP_HPD_INTERRUPT\n");
+		mtk_dp->train_info.irq_sta.hpd_inerrupt = false;
+		mtk_dp_hpd_sink_event(mtk_dp);
+	}
+
+	return IRQ_HANDLED;
+}
+