[PATCH v4 20/34] drm/exynos: Implement mode_fixup manager operation

[Sean Paul]

This patch adds a new manager callback for mode_fixup and pipes it
through exynos_drm_crtc. This will allow the manager drivers to
alter the mode during modeset.

Signed-off-by: Sean Paul <seanpaul at chromium.org>
---

Changes in v2: None
Changes in v3: None
Changes in v4:
 - Added more detail to the commit msg

 drivers/gpu/drm/exynos/exynos_drm_crtc.c | 7 ++++++-
 drivers/gpu/drm/exynos/exynos_drm_drv.h  | 4 ++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index a5cb104..100a561 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -105,7 +105,12 @@ exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
 			    const struct drm_display_mode *mode,
 			    struct drm_display_mode *adjusted_mode)
 {
-	/* drm framework doesn't check NULL */
+	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
+	struct exynos_drm_manager *manager = exynos_crtc->manager;
+
+	if (manager->ops->mode_fixup)
+		return manager->ops->mode_fixup(manager, mode, adjusted_mode);
+
 	return true;
 }
 
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index caba299..81f7de4 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -184,6 +184,7 @@ struct exynos_drm_display {
  * @initialize: initializes the manager with drm_dev
  * @remove: cleans up the manager for removal
  * @dpms: control device power.
+ * @mode_fixup: fix mode data before applying it
  * @mode_set: set the given mode to the manager
  * @commit: set current hw specific display mode to hw.
  * @enable_vblank: specific driver callback for enabling vblank interrupt.
@@ -201,6 +202,9 @@ struct exynos_drm_manager_ops {
 				struct drm_device *drm_dev, int pipe);
 	void (*remove)(struct exynos_drm_manager *mgr);
 	void (*dpms)(struct exynos_drm_manager *mgr, int mode);
+	bool (*mode_fixup)(struct exynos_drm_manager *mgr,
+				const struct drm_display_mode *mode,
+				struct drm_display_mode *adjusted_mode);
 	void (*mode_set)(struct exynos_drm_manager *mgr,
 				const struct drm_display_mode *mode);
 	void (*commit)(struct exynos_drm_manager *mgr);
-- 
1.8.5.1