[PATCH 25/36] drm/omap: Use omapdss_stack_is_ready() to check that the display stack is up

[Tomi Valkeinen]

From: Peter Ujfalusi <peter.ujfal...@ti.com>

Instead of 'guessing' based on aliases of the status of the DSS drivers,
use the new interface to check that all needed drivers are loaded.
In this way we can be sure that all needed drivers are loaded so it is
safe to continue the probing of omapdrm.
This method will allow the omapdrm to be probed 'headless', without
outputs.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
---
 drivers/gpu/drm/omapdrm/omap_drv.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c 
b/drivers/gpu/drm/omapdrm/omap_drv.c
index 4894e09a75f6..eecf8649c0f7 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -236,7 +236,9 @@ static int omap_connect_dssdevs(void)
 {
        int r;
        struct omap_dss_device *dssdev = NULL;
-       bool no_displays = true;
+
+       if (!omapdss_stack_is_ready())
+               return -EPROBE_DEFER;

        for_each_dss_dev(dssdev) {
                r = dssdev->driver->connect(dssdev);
@@ -246,14 +248,9 @@ static int omap_connect_dssdevs(void)
                } else if (r) {
                        dev_warn(dssdev->dev, "could not connect display: %s\n",
                                dssdev->name);
-               } else {
-                       no_displays = false;
                }
        }

-       if (no_displays)
-               return -EPROBE_DEFER;
-
        return 0;

 cleanup:
-- 
2.7.4