On Tue, 20 Aug 2019 04:16:42 +0300
Laurent Pinchart <laurent.pinch...@ideasonboard.com> wrote:
> + /*
> + * Get the HPD GPIO for DVI and HDMI connectors. If the GPIO can provide
> + * interrupts, register an interrupt handler.
> + */
> + if (type == DRM_MODE_CONNECTOR_DVII ||
> + type == DRM_MODE_CONNECTOR_HDMIA) {
> + conn->hpd_gpio = devm_gpiod_get_optional(&pdev->dev, "hpd",
> + GPIOD_IN);
> + if (IS_ERR(conn->hpd_gpio)) {
> + if (PTR_ERR(conn->hpd_gpio) != -EPROBE_DEFER)
> + dev_err(&pdev->dev,
> + "Unable to retrieve HPD GPIO\n");
> + return PTR_ERR(conn->hpd_gpio);
> + }
> +
> + conn->hpd_irq = gpiod_to_irq(conn->hpd_gpio);
> + } else {
> + conn->hpd_irq = -EINVAL;
> + }
> +
> + if (conn->hpd_irq >= 0) {
> + ret = devm_request_threaded_irq(&pdev->dev, conn->hpd_irq,
> + NULL, display_connector_hpd_irq,
> + IRQF_TRIGGER_RISING |
> + IRQF_TRIGGER_FALLING |
> + IRQF_ONESHOT,
> + "HPD", conn);
> + if (ret) {
> + dev_err(&pdev->dev,
> + "Failed to request HPD interrupt\n");
> + return ret;
Is there anything that mandates support of edge events on GPIO chips?
I know it's quite common, but maybe we should fallback to polling
mode when devm_request_threaded_irq() fails.
> + }
> + }
> +
> + /* Retrieve the DDC I2C adapter for DVI, HDMI and VGA connectors. */
> + if (type == DRM_MODE_CONNECTOR_DVII ||
> + type == DRM_MODE_CONNECTOR_HDMIA ||
> + type == DRM_MODE_CONNECTOR_VGA) {
> + struct device_node *phandle;
> +
> + phandle = of_parse_phandle(pdev->dev.of_node, "ddc-i2c-bus", 0);
> + if (phandle) {
> + conn->bridge.ddc = of_get_i2c_adapter_by_node(phandle);
> + of_node_put(phandle);
> + if (!conn->bridge.ddc)
> + return -EPROBE_DEFER;
> + } else {
> + dev_dbg(&pdev->dev,
> + "No I2C bus specified, disabling EDID
> readout\n");
> + }
> + }
> +
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