Some platforms may not have a HPD gpio line to detect Hot Plug signal from
the connector. They need to rely only on reading REG_HDMI_HPD_INT_STATUS
for HPD.
Modify hdmi_connector_detect logic such that it checks for HPD only using
the status register if there is no HPD gpio.
Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/msm/hdmi/hdmi_connector.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
index deec1f9..3973d46 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
@@ -301,9 +301,18 @@ static enum drm_connector_status hdmi_connector_detect(
{
struct hdmi_connector *hdmi_connector = to_hdmi_connector(connector);
struct hdmi *hdmi = hdmi_connector->hdmi;
+ const struct hdmi_platform_config *config = hdmi->config;
+ struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
enum drm_connector_status stat_gpio, stat_reg;
int retry = 20;
+ /*
+ * some platforms may not have hpd gpio. Rely only on the status
+ * provided by REG_HDMI_HPD_INT_STATUS in this case.
+ */
+ if (hpd_gpio.num == -1)
+ return detect_reg(hdmi);
+
do {
stat_gpio = detect_gpio(hdmi);
stat_reg = detect_reg(hdmi);
--
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