drm/rockchip: vop2: fix suspend/resume

During a suspend/resume cycle the VO power domain will be disabled and
the VOP2 registers will reset to their default values. After that the
cached register values will be out of sync and the read/modify/write
operations we do on the window registers will result in bogus values
written. Fix this by re-initializing the register cache each time we
enable the VOP2. With this the VOP2 will show a picture after a
suspend/resume cycle whereas without this the screen stays dark.

Fixes: 604be85 ("drm/rockchip: Add VOP2 driver")
Cc: [email protected]
Signed-off-by: Sascha Hauer <[email protected]>
Tested-by: Chris Morgan <[email protected]>
Signed-off-by: Heiko Stuebner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: saschahauer

drivers/gpu/drm/rockchip/rockchip_drm_vop2.c

@@ -215,6 +215,8 @@ struct vop2 {
 	struct vop2_win win[];
 };
 
+static const struct regmap_config vop2_regmap_config;
+
 static struct vop2_video_port *to_vop2_video_port(struct drm_crtc *crtc)
 {
 	return container_of(crtc, struct vop2_video_port, crtc);
@@ -839,6 +841,12 @@ static void vop2_enable(struct vop2 *vop2)
 		return;
 	}
 
+	ret = regmap_reinit_cache(vop2->map, &vop2_regmap_config);
+	if (ret) {
+		drm_err(vop2->drm, "failed to reinit cache: %d\n", ret);
+		return;
+	}
+
 	if (vop2->data->soc_id == 3566)
 		vop2_writel(vop2, RK3568_OTP_WIN_EN, 1);