drm/msm/dpu: sync mode_config limits to the FB limits in dpu_plane.c

Lift mode_config limits set by the DPU driver to the actual FB limits as
handled by the dpu_plane.c. Move 2*max_lm_width check where it belongs,
to the drm_crtc_helper_funcs::mode_valid() callback.

Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Tested-by: Abhinav Kumar <quic_abhinavk@quicinc.com> # sc7280
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/612259/
Link: https://lore.kernel.org/r/20240903-dpu-mode-config-width-v6-15-617e1ecc4b7a@linaro.org

Author: lumag

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -1230,6 +1230,19 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
 	return 0;
 }
 
+static enum drm_mode_status dpu_crtc_mode_valid(struct drm_crtc *crtc,
+						const struct drm_display_mode *mode)
+{
+	struct dpu_kms *dpu_kms = _dpu_crtc_get_kms(crtc);
+
+	/*
+	 * max crtc width is equal to the max mixer width * 2 and max height is 4K
+	 */
+	return drm_mode_validate_size(mode,
+				      2 * dpu_kms->catalog->caps->max_mixer_width,
+				      4096);
+}
+
 int dpu_crtc_vblank(struct drm_crtc *crtc, bool en)
 {
 	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
@@ -1445,6 +1458,7 @@ static const struct drm_crtc_helper_funcs dpu_crtc_helper_funcs = {
 	.atomic_check = dpu_crtc_atomic_check,
 	.atomic_begin = dpu_crtc_atomic_begin,
 	.atomic_flush = dpu_crtc_atomic_flush,
+	.mode_valid = dpu_crtc_mode_valid,
 	.get_scanout_position = dpu_crtc_get_scanout_position,
 };
 

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

@@ -1201,13 +1201,8 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 	dev->mode_config.min_width = 0;
 	dev->mode_config.min_height = 0;
 
-	/*
-	 * max crtc width is equal to the max mixer width * 2 and max height is
-	 * is 4K
-	 */
-	dev->mode_config.max_width =
-			dpu_kms->catalog->caps->max_mixer_width * 2;
-	dev->mode_config.max_height = 4096;
+	dev->mode_config.max_width = DPU_MAX_IMG_WIDTH;
+	dev->mode_config.max_height = DPU_MAX_IMG_HEIGHT;
 
 	dev->max_vblank_count = 0xffffffff;
 	/* Disable vblank irqs aggressively for power-saving */