drm/exynos: create exynos_check_plane()

Split update plane in two parts, an initial check part that can fail
and the update part that can't fail.

This is a important step for the upcoming atomic modesetting support.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

3 files changed, 36 insertions, 20 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index 357fcd59aa48..a85c451ba392 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -92,6 +92,7 @@ exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
         struct drm_framebuffer *fb = crtc->primary->fb;
         unsigned int crtc_w;
         unsigned int crtc_h;
+        int ret;
 
         /*
          * copy the mode data adjusted by mode_fixup() into crtc->mode
@@ -99,10 +100,16 @@ exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
          */
         memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));
 
+        ret = exynos_check_plane(crtc->primary, fb);
+        if (ret < 0)
+                return ret;
+
         crtc_w = fb->width - x;
         crtc_h = fb->height - y;
-        return exynos_plane_mode_set(crtc->primary, crtc, fb, 0, 0,
-                                     crtc_w, crtc_h, x, y, crtc_w, crtc_h);
+        exynos_plane_mode_set(crtc->primary, crtc, fb, 0, 0,
+                              crtc_w, crtc_h, x, y, crtc_w, crtc_h);
+
+        return 0;
 }
 
 static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
index 95442e69db75..358cff67e5ce 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -12,6 +12,7 @@
 #include <drm/drmP.h>
 
 #include <drm/exynos_drm.h>
+#include <drm/drm_plane_helper.h>
 #include "exynos_drm_drv.h"
 #include "exynos_drm_crtc.h"
 #include "exynos_drm_fb.h"
@@ -61,16 +62,9 @@ static int exynos_plane_get_size(int start, unsigned length, unsigned last)
         return size;
 }
 
-int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
-                          struct drm_framebuffer *fb, int crtc_x, int crtc_y,
-                          unsigned int crtc_w, unsigned int crtc_h,
-                          uint32_t src_x, uint32_t src_y,
-                          uint32_t src_w, uint32_t src_h)
+int exynos_check_plane(struct drm_plane *plane, struct drm_framebuffer *fb)
 {
         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
-        struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
-        unsigned int actual_w;
-        unsigned int actual_h;
         int nr;
         int i;
 
@@ -89,6 +83,20 @@ int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
                                 i, (unsigned long)exynos_plane->dma_addr[i]);
         }
 
+        return 0;
+}
+
+void exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
+                          struct drm_framebuffer *fb, int crtc_x, int crtc_y,
+                          unsigned int crtc_w, unsigned int crtc_h,
+                          uint32_t src_x, uint32_t src_y,
+                          uint32_t src_w, uint32_t src_h)
+{
+        struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
+        struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
+        unsigned int actual_w;
+        unsigned int actual_h;
+
         actual_w = exynos_plane_get_size(crtc_x, crtc_w, crtc->mode.hdisplay);
         actual_h = exynos_plane_get_size(crtc_y, crtc_h, crtc->mode.vdisplay);
 
@@ -135,8 +143,6 @@ int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
 
         if (exynos_crtc->ops->win_mode_set)
                 exynos_crtc->ops->win_mode_set(exynos_crtc, exynos_plane);
-
-        return 0;
 }
 
 void exynos_plane_dpms(struct drm_plane *plane, int mode)
@@ -177,12 +183,14 @@ exynos_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
         struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane);
         int ret;
 
-        ret = exynos_plane_mode_set(plane, crtc, fb, crtc_x, crtc_y,
-                        crtc_w, crtc_h, src_x >> 16, src_y >> 16,
-                        src_w >> 16, src_h >> 16);
+        ret = exynos_check_plane(plane, fb);
         if (ret < 0)
                 return ret;
 
+        exynos_plane_mode_set(plane, crtc, fb, crtc_x, crtc_y,
+                              crtc_w, crtc_h, src_x >> 16, src_y >> 16,
+                              src_w >> 16, src_h >> 16);
+
         if (exynos_crtc->ops->win_commit)
                 exynos_crtc->ops->win_commit(exynos_crtc, exynos_plane->zpos);
 
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.h b/drivers/gpu/drm/exynos/exynos_drm_plane.h
index d25c079a3f44..59d40755095b 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.h
@@ -9,11 +9,12 @@
  *
  */
 
-int exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
-                          struct drm_framebuffer *fb, int crtc_x, int crtc_y,
-                          unsigned int crtc_w, unsigned int crtc_h,
-                          uint32_t src_x, uint32_t src_y,
-                          uint32_t src_w, uint32_t src_h);
+int exynos_check_plane(struct drm_plane *plane, struct drm_framebuffer *fb);
+void exynos_plane_mode_set(struct drm_plane *plane, struct drm_crtc *crtc,
+                           struct drm_framebuffer *fb, int crtc_x, int crtc_y,
+                           unsigned int crtc_w, unsigned int crtc_h,
+                           uint32_t src_x, uint32_t src_y,
+                           uint32_t src_w, uint32_t src_h);
 int exynos_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
                         struct drm_framebuffer *fb, int crtc_x, int crtc_y,
                         unsigned int crtc_w, unsigned int crtc_h,