drm/mgag200: Fix VBLANK interrupt handling

Fix support for VBLANK interrupts on G200ER, G200EV and G200SE, which
use a slightly different implementation than the others. The original
commits forgot to update the custom helpers when adding interrupt
handling for VBLANK events.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 89c6ea2 ("drm/mgag200: Add vblank support")
Fixes: d5070c9 ("drm/mgag200: Implement struct drm_crtc_funcs.get_vblank_timestamp")
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jocelyn Falempe <jfalempe@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Acked-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240731071004.519566-1-tzimmermann@suse.de

drivers/gpu/drm/mgag200/mgag200_g200er.c

@@ -209,14 +209,17 @@ static void mgag200_g200er_crtc_helper_atomic_enable(struct drm_crtc *crtc,
 
 	if (mdev->info->sync_bmc)
 		mgag200_bmc_start_scanout(mdev);
+
+	drm_crtc_vblank_on(crtc);
 }
 
 static const struct drm_crtc_helper_funcs mgag200_g200er_crtc_helper_funcs = {
 	.mode_valid = mgag200_crtc_helper_mode_valid,
 	.atomic_check = mgag200_crtc_helper_atomic_check,
 	.atomic_flush = mgag200_crtc_helper_atomic_flush,
 	.atomic_enable = mgag200_g200er_crtc_helper_atomic_enable,
-	.atomic_disable = mgag200_crtc_helper_atomic_disable
+	.atomic_disable = mgag200_crtc_helper_atomic_disable,
+	.get_scanout_position = mgag200_crtc_helper_get_scanout_position,
 };
 
 static const struct drm_crtc_funcs mgag200_g200er_crtc_funcs = {

drivers/gpu/drm/mgag200/mgag200_g200ev.c

@@ -210,14 +210,17 @@ static void mgag200_g200ev_crtc_helper_atomic_enable(struct drm_crtc *crtc,
 
 	if (mdev->info->sync_bmc)
 		mgag200_bmc_start_scanout(mdev);
+
+	drm_crtc_vblank_on(crtc);
 }
 
 static const struct drm_crtc_helper_funcs mgag200_g200ev_crtc_helper_funcs = {
 	.mode_valid = mgag200_crtc_helper_mode_valid,
 	.atomic_check = mgag200_crtc_helper_atomic_check,
 	.atomic_flush = mgag200_crtc_helper_atomic_flush,
 	.atomic_enable = mgag200_g200ev_crtc_helper_atomic_enable,
-	.atomic_disable = mgag200_crtc_helper_atomic_disable
+	.atomic_disable = mgag200_crtc_helper_atomic_disable,
+	.get_scanout_position = mgag200_crtc_helper_get_scanout_position,
 };
 
 static const struct drm_crtc_funcs mgag200_g200ev_crtc_funcs = {

drivers/gpu/drm/mgag200/mgag200_g200se.c

@@ -341,14 +341,17 @@ static void mgag200_g200se_crtc_helper_atomic_enable(struct drm_crtc *crtc,
 
 	if (mdev->info->sync_bmc)
 		mgag200_bmc_start_scanout(mdev);
+
+	drm_crtc_vblank_on(crtc);
 }
 
 static const struct drm_crtc_helper_funcs mgag200_g200se_crtc_helper_funcs = {
 	.mode_valid = mgag200_crtc_helper_mode_valid,
 	.atomic_check = mgag200_crtc_helper_atomic_check,
 	.atomic_flush = mgag200_crtc_helper_atomic_flush,
 	.atomic_enable = mgag200_g200se_crtc_helper_atomic_enable,
-	.atomic_disable = mgag200_crtc_helper_atomic_disable
+	.atomic_disable = mgag200_crtc_helper_atomic_disable,
+	.get_scanout_position = mgag200_crtc_helper_get_scanout_position,
 };
 
 static const struct drm_crtc_funcs mgag200_g200se_crtc_funcs = {