[PATCH] drm/exynos: fix .get_modes return value in case of errors

[Marek Szyprowski]

Commit 7af03e688792 ("drm/probe-helper: warn about negative
.get_modes()") clarified, that .get_modes callback must not return
negative values on failure, so fix sub-drivers to return 0 in case of
errors. This fixes strange Exynos DRM initialization failure on boot
(timeout waiting for VSYNC) observed on Trats2 board.

Cc: sta...@vger.kernel.org
Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_vidi.c | 4 ++--
 drivers/gpu/drm/exynos/exynos_hdmi.c     | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c 
b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
index e5662bdcbbde..e3868956eb88 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
@@ -315,14 +315,14 @@ static int vidi_get_modes(struct drm_connector *connector)
         */
        if (!ctx->raw_edid) {
                DRM_DEV_DEBUG_KMS(ctx->dev, "raw_edid is null.\n");
-               return -EFAULT;
+               return 0;
        }
 
        edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
        edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
        if (!edid) {
                DRM_DEV_DEBUG_KMS(ctx->dev, "failed to allocate edid\n");
-               return -ENOMEM;
+               return 0;
        }
 
        drm_connector_update_edid_property(connector, edid);
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c 
b/drivers/gpu/drm/exynos/exynos_hdmi.c
index c5ba32fca5f3..603d8bb0b03a 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -878,11 +878,11 @@ static int hdmi_get_modes(struct drm_connector *connector)
        int ret;
 
        if (!hdata->ddc_adpt)
-               return -ENODEV;
+               return 0;
 
        edid = drm_get_edid(connector, hdata->ddc_adpt);
        if (!edid)
-               return -ENODEV;
+               return 0;
 
        hdata->dvi_mode = !drm_detect_hdmi_monitor(edid);
        DRM_DEV_DEBUG_KMS(hdata->dev, "%s : width[%d] x height[%d]\n",
-- 
2.34.1