drm/exynos: add mode_fixup callback to exynos_drm_crtc_ops

crtc::mode_fixup callback is required by crtcs which internally use
a different mode than requested by user - case of Exynos Mixer.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index 6ce0821590df..dc01342e759a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -95,8 +95,23 @@ static enum drm_mode_status exynos_crtc_mode_valid(struct drm_crtc *crtc,
         return MODE_OK;
 }
 
+static bool exynos_crtc_mode_fixup(struct drm_crtc *crtc,
+                const struct drm_display_mode *mode,
+                struct drm_display_mode *adjusted_mode)
+{
+        struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
+
+        if (exynos_crtc->ops->mode_fixup)
+                return exynos_crtc->ops->mode_fixup(exynos_crtc, mode,
+                                adjusted_mode);
+
+        return true;
+}
+
+
 static const struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
         .mode_valid     = exynos_crtc_mode_valid,
+        .mode_fixup     = exynos_crtc_mode_fixup,
         .atomic_check   = exynos_crtc_atomic_check,
         .atomic_begin   = exynos_crtc_atomic_begin,
         .atomic_flush   = exynos_crtc_atomic_flush,
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index f8bae4cb4823..c6847fa708fa 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -136,6 +136,9 @@ struct exynos_drm_crtc_ops {
         u32 (*get_vblank_counter)(struct exynos_drm_crtc *crtc);
         enum drm_mode_status (*mode_valid)(struct exynos_drm_crtc *crtc,
                 const struct drm_display_mode *mode);
+        bool (*mode_fixup)(struct exynos_drm_crtc *crtc,
+                           const struct drm_display_mode *mode,
+                           struct drm_display_mode *adjusted_mode);
         int (*atomic_check)(struct exynos_drm_crtc *crtc,
                             struct drm_crtc_state *state);
         void (*atomic_begin)(struct exynos_drm_crtc *crtc);