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drm/bridge: ti-sn65dsi86: Enable HPD polling if IRQ is not used

Fallback to polling to detect hotplug events on systems without
interrupts.

On systems where the interrupt line of the bridge is not connected,
the bridge cannot notify hotplug events. Only add the
DRM_BRIDGE_OP_HPD flag if an interrupt has been registered
otherwise remain in polling mode.

Fixes: 55e8ff842051 ("drm/bridge: ti-sn65dsi86: Add HPD for DisplayPort connector type")
Cc: stable@vger.kernel.org # 6.16: 9133bc3f0564: drm/bridge: ti-sn65dsi86: Add
Signed-off-by: Franz Schnyder <franz.schnyder@toradex.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
[dianders: Adjusted Fixes/stable line based on discussion]
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patch.msgid.link/20260206123758.374555-1-fra.schnyder@gmail.com

authored by

Franz Schnyder and committed by
Douglas Anderson 0b87d516 fef0e649

+4 -2
+4 -2
drivers/gpu/drm/bridge/ti-sn65dsi86.c
··· 1415 1415 { 1416 1416 struct ti_sn65dsi86 *pdata = dev_get_drvdata(adev->dev.parent); 1417 1417 struct device_node *np = pdata->dev->of_node; 1418 + const struct i2c_client *client = to_i2c_client(pdata->dev); 1418 1419 int ret; 1419 1420 1420 1421 pdata->next_bridge = devm_drm_of_get_bridge(&adev->dev, np, 1, 0); ··· 1434 1433 ? DRM_MODE_CONNECTOR_DisplayPort : DRM_MODE_CONNECTOR_eDP; 1435 1434 1436 1435 if (pdata->bridge.type == DRM_MODE_CONNECTOR_DisplayPort) { 1437 - pdata->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT | 1438 - DRM_BRIDGE_OP_HPD; 1436 + pdata->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_DETECT; 1437 + if (client->irq) 1438 + pdata->bridge.ops |= DRM_BRIDGE_OP_HPD; 1439 1439 /* 1440 1440 * If comms were already enabled they would have been enabled 1441 1441 * with the wrong value of HPD_DISABLE. Update it now. Comms