drm/atmel-hlcdc: Use crtc->mode_valid() callback

Now that we have a callback to check if crtc supports a given mode
we can use it in atmel-hlcdc so that we restrict the number of probbed
modes to the ones we can actually display.

Also, remove the mode_fixup() callback as this is no longer needed
because mode_valid() will be called before.
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Link: http://patchwork.freedesktop.org/patch/msgid/95fd6c06c58bd0b957e36a8d7068e6a74b581304.1495720737.git.joabreu@synopsys.com

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c

@@ -140,13 +140,13 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
 			   cfg);
 }
 
-static bool atmel_hlcdc_crtc_mode_fixup(struct drm_crtc *c,
-					const struct drm_display_mode *mode,
-					struct drm_display_mode *adjusted_mode)
+static enum drm_mode_status
+atmel_hlcdc_crtc_mode_valid(struct drm_crtc *c,
+			    const struct drm_display_mode *mode)
 {
 	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
 
-	return atmel_hlcdc_dc_mode_valid(crtc->dc, adjusted_mode) == MODE_OK;
+	return atmel_hlcdc_dc_mode_valid(crtc->dc, mode);
 }
 
 static void atmel_hlcdc_crtc_disable(struct drm_crtc *c)
@@ -315,7 +315,7 @@ static void atmel_hlcdc_crtc_atomic_flush(struct drm_crtc *crtc,
 }
 
 static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = {
-	.mode_fixup = atmel_hlcdc_crtc_mode_fixup,
+	.mode_valid = atmel_hlcdc_crtc_mode_valid,
 	.mode_set = drm_helper_crtc_mode_set,
 	.mode_set_nofb = atmel_hlcdc_crtc_mode_set_nofb,
 	.mode_set_base = drm_helper_crtc_mode_set_base,

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c

@@ -375,8 +375,9 @@ static const struct of_device_id atmel_hlcdc_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, atmel_hlcdc_of_match);
 
-int atmel_hlcdc_dc_mode_valid(struct atmel_hlcdc_dc *dc,
-			      struct drm_display_mode *mode)
+enum drm_mode_status
+atmel_hlcdc_dc_mode_valid(struct atmel_hlcdc_dc *dc,
+			  const struct drm_display_mode *mode)
 {
 	int vfront_porch = mode->vsync_start - mode->vdisplay;
 	int vback_porch = mode->vtotal - mode->vsync_end;

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h

@@ -422,8 +422,9 @@ static inline void atmel_hlcdc_layer_init(struct atmel_hlcdc_layer *layer,
 	layer->regmap = regmap;
 }
 
-int atmel_hlcdc_dc_mode_valid(struct atmel_hlcdc_dc *dc,
-			      struct drm_display_mode *mode);
+enum drm_mode_status
+atmel_hlcdc_dc_mode_valid(struct atmel_hlcdc_dc *dc,
+			  const struct drm_display_mode *mode);
 
 int atmel_hlcdc_create_planes(struct drm_device *dev);
 void atmel_hlcdc_plane_irq(struct atmel_hlcdc_plane *plane);