drm/rockchip: vop: fix format bpp calculation

We can't rely on cpp for bpp calculation as the cpp of
some formats(DRM_FORMAT_YUV420_8BIT/10BIT, etc) is zero.

Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20231018094210.2475771-1-andyshrk@163.com

drivers/gpu/drm/rockchip/rockchip_drm_vop2.c

@@ -282,6 +282,20 @@ static void vop2_win_disable(struct vop2_win *win)
 		vop2_win_write(win, VOP2_WIN_CLUSTER_ENABLE, 0);
 }
 
+static u32 vop2_get_bpp(const struct drm_format_info *format)
+{
+	switch (format->format) {
+	case DRM_FORMAT_YUV420_8BIT:
+		return 12;
+	case DRM_FORMAT_YUV420_10BIT:
+		return 15;
+	case DRM_FORMAT_VUY101010:
+		return 30;
+	default:
+		return drm_format_info_bpp(format, 0);
+	}
+}
+
 static enum vop2_data_format vop2_convert_format(u32 format)
 {
 	switch (format) {
@@ -482,7 +496,7 @@ static u32 vop2_afbc_transform_offset(struct drm_plane_state *pstate,
 {
 	struct drm_rect *src = &pstate->src;
 	struct drm_framebuffer *fb = pstate->fb;
-	u32 bpp = fb->format->cpp[0] * 8;
+	u32 bpp = vop2_get_bpp(fb->format);
 	u32 vir_width = (fb->pitches[0] << 3) / bpp;
 	u32 width = drm_rect_width(src) >> 16;
 	u32 height = drm_rect_height(src) >> 16;
@@ -1080,7 +1094,7 @@ static void vop2_plane_atomic_update(struct drm_plane *plane,
 	struct drm_display_mode *adjusted_mode = &crtc->state->adjusted_mode;
 	struct vop2 *vop2 = win->vop2;
 	struct drm_framebuffer *fb = pstate->fb;
-	u32 bpp = fb->format->cpp[0] * 8;
+	u32 bpp = vop2_get_bpp(fb->format);
 	u32 actual_w, actual_h, dsp_w, dsp_h;
 	u32 act_info, dsp_info;
 	u32 format;