Commit ccd7b5ed authored Nov 14, 2014 by Tomi Valkeinen

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>

parent f5a1d317

drivers/gpu/drm/omapdrm/omap_drv.c

+20 −1

Original line number	Diff line number	Diff line
		@@ -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