[PATCH] drm/i915: Use helper to set CRTC state's mode

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We need to call drm_atomic_set_mode_for_crtc() rather than copying the
mode in manually.  As of commit

        commit 99cf4a29fa24461bbfe22125967188a18383eb5c
        Author: Daniel Stone <daniels@xxxxxxxxxxxxx>
        Date:   Mon May 25 19:11:51 2015 +0100

            drm/atomic: Add current-mode blob to CRTC state

the helper now also takes care of setting up the mode property blob for
us; if we don't use the helper and never setup the mode blob, this will
also trigger a failure in drm_atomic_crtc_check() when we have the
DRIVER_ATOMIC flag set (i.e., when using the nuclear pageflip support
via i915.nuclear_pageflip kernel command line parameter).

Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_display.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c38c297..4828716 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13192,8 +13192,9 @@ intel_modeset_stage_output_state(struct drm_device *dev,
 	if (IS_ERR(crtc_state))
 		return PTR_ERR(crtc_state);
 
-	if (set->mode)
-		drm_mode_copy(&crtc_state->mode, set->mode);
+	ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode);
+	if (ret)
+		return ret;
 
 	if (set->num_connectors)
 		crtc_state->active = true;
-- 
1.8.5.1

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