drm: Add old state pointer to CRTC .enable() helper function

The old state is useful for drivers that need to perform operations at
enable time that depend on the transition between the old and new
states.

While at it, rename the operation to .atomic_enable() to be consistent
with .atomic_disable(), as the .enable() operation is used by atomic
helpers only.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> # for sun4i
Acked-by: Philipp Zabel <p.zabel@pengutronix.de> # for imx-drm and mediatek
Acked-by: Alexey Brodkin <abrodkin@synopsys.com> # for arcpgu
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> # for atmel-hlcdc
Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> # for hdlcd and mali-dp
Acked-by: Stefan Agner <stefan@agner.ch> # for fsl-dcu
Tested-by: Philippe Cornu <philippe.cornu@st.com> # for stm
Acked-by: Philippe Cornu <philippe.cornu@st.com> # for stm
Acked-by: Vincent Abriou <vincent.abriou@st.com> # for sti
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com> # for vmwgfx
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170630093646.7928-2-laurent.pinchart+renesas@ideasonboard.com

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
index dd0ef40ca469..7a1b7a9cc270 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
@@ -356,7 +356,8 @@ static void omap_crtc_arm_event(struct drm_crtc *crtc)
         }
 }
 
-static void omap_crtc_enable(struct drm_crtc *crtc)
+static void omap_crtc_atomic_enable(struct drm_crtc *crtc,
+                                    struct drm_crtc_state *old_state)
 {
         struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
         int ret;
@@ -568,10 +569,10 @@ static const struct drm_crtc_funcs omap_crtc_funcs = {
 static const struct drm_crtc_helper_funcs omap_crtc_helper_funcs = {
         .mode_set_nofb = omap_crtc_mode_set_nofb,
         .disable = omap_crtc_disable,
-        .enable = omap_crtc_enable,
         .atomic_check = omap_crtc_atomic_check,
         .atomic_begin = omap_crtc_atomic_begin,
         .atomic_flush = omap_crtc_atomic_flush,
+        .atomic_enable = omap_crtc_atomic_enable,
 };
 
 /* -----------------------------------------------------------------------------