drm/omap: stop connector polling during suspend

When not using proper hotplug detection, DRM polls periodically the
connectors to find out if a cable is connected. This polling can happen
at any time, even very late in the suspend process.

This causes a problem with omapdrm, when the poll happens during the
suspend process after GPIOs have been disabled, leading to a crash in
gpio_get().

This patch fixes the issue by adding suspend and resume hooks to
omapdrm, in which we disable and enable, respectively, the polling.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 8d8cf82ecdf7..c4c237317901 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -706,9 +706,28 @@ static int pdev_remove(struct platform_device *device)
         return 0;
 }
 
+static int omap_drm_suspend(struct device *dev)
+{
+        struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+        drm_kms_helper_poll_disable(drm_dev);
+
+        return 0;
+}
+
+static int omap_drm_resume(struct device *dev)
+{
+        struct drm_device *drm_dev = dev_get_drvdata(dev);
+
+        drm_kms_helper_poll_enable(drm_dev);
+
+        return omap_gem_resume(dev);
+}
+
 #ifdef CONFIG_PM
 static const struct dev_pm_ops omapdrm_pm_ops = {
-        .resume = omap_gem_resume,
+        .suspend = omap_drm_suspend,
+        .resume = omap_drm_resume,
 };
 #endif