drm/mediatek: mtk_hdmi_ddc_v2: Add transfer abort on timeout cases

During a read or write transfer, the mtk_hdmi_ddc_v2 driver polls the
DDC_I2C_IN_PROG bit of HPD_DDC_STATUS register to check if the transfer
completes but do no particular action if a timeout is reached. It could
lead the next transfer attempts to fail because the faulty transfer was
not aborted. So, add in both low level read and write functions a abort
action by writing the DDC_CTRL register with the ABORT_XFER command
value.

Fixes: 8d0f798 ("drm/mediatek: Introduce HDMI/DDC v2 for MT8195/MT8188")
Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20251205-mtk-hdmi-ddc-v2-fixes-v1-1-260dd0d320f4@collabora.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

Author: laeyraud

drivers/gpu/drm/mediatek/mtk_hdmi_ddc_v2.c

@@ -96,6 +96,11 @@ static int mtk_ddc_wr_one(struct mtk_hdmi_ddc *ddc, u16 addr_id,
 				       !(val & DDC_I2C_IN_PROG), 500, 1000);
 	if (ret) {
 		dev_err(ddc->dev, "DDC I2C write timeout\n");
+
+		/* Abort transfer if it is still in progress */
+		regmap_update_bits(ddc->regs, DDC_CTRL, DDC_CTRL_CMD,
+				   FIELD_PREP(DDC_CTRL_CMD, DDC_CMD_ABORT_XFER));
+
 		return ret;
 	}
 
@@ -179,6 +184,11 @@ static int mtk_ddcm_read_hdmi(struct mtk_hdmi_ddc *ddc, u16 uc_dev,
 					       500 * (temp_length + 5));
 		if (ret) {
 			dev_err(ddc->dev, "Timeout waiting for DDC I2C\n");
+
+			/* Abort transfer if it is still in progress */
+			regmap_update_bits(ddc->regs, DDC_CTRL, DDC_CTRL_CMD,
+					   FIELD_PREP(DDC_CTRL_CMD, DDC_CMD_ABORT_XFER));
+
 			return ret;
 		}