drm/omap: tiler: add hibernation callback

Setting a dev_pm_ops resume callback but not a set of hibernation
handler means that pm function will not be called upon hibernation.

Fix this by using SIMPLE_DEV_PM_OPS, which appropriately assigns the
suspend and hibernation handlers and move omap_dmm_resume under
CONFIG_PM_SLEEP to avoid build warnings.

Signed-off-by: Grygorii Strashko <grygorii.strashko@linaro.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>
[tomi valkeinen: add missing 'static']
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_dmm_tiler.c

@@ -965,7 +965,7 @@ error:
 }
 #endif
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int omap_dmm_resume(struct device *dev)
 {
 	struct tcm_area area;
@@ -989,12 +989,10 @@ static int omap_dmm_resume(struct device *dev)
 
 	return 0;
 }
-
-static const struct dev_pm_ops omap_dmm_pm_ops = {
-	.resume = omap_dmm_resume,
-};
 #endif
 
+static SIMPLE_DEV_PM_OPS(omap_dmm_pm_ops, NULL, omap_dmm_resume);
+
 #if defined(CONFIG_OF)
 static const struct dmm_platform_data dmm_omap4_platform_data = {
 	.cpu_cache_flags = OMAP_BO_WC,
@@ -1024,9 +1022,7 @@ struct platform_driver omap_dmm_driver = {
 		.owner = THIS_MODULE,
 		.name = DMM_DRIVER_NAME,
 		.of_match_table = of_match_ptr(dmm_of_match),
-#ifdef CONFIG_PM
 		.pm = &omap_dmm_pm_ops,
-#endif
 	},
 };