[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