drm/rockchip: vop2: fix suspend/resume

BugLink: https://bugs.launchpad.net/bugs/2023929
commit afa965a45e01e541cdbe5c8018226eff117610f0 upstream.

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: 604be85547ce4 ("drm/rockchip: Add VOP2 driver")
Cc: stable@vger.kernel.org
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230413144347.3506023-1-s.hauer@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
index 8cecf81a5ae032e25fe8f38c2863afc8c6e29974..86b290659bfd68858ae4e7e0ab6ca5131bbf430f 100644 (file)
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
@@ -216,6 +216,8 @@ 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);
@@ -840,6 +842,12 @@ 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);