[PATCH 4.19 077/134] drm/rockchip: vop: reset scale mode when win is disabled

[Greg Kroah-Hartman]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jonas Karlman <jonas@xxxxxxxxx>

commit e9abc611a941d4051cde1d94b2ab7473fdb50102 upstream.

NV12 framebuffers produced by the VPU shows distorted on RK3288
after win has been disabled when scaling is active.

This issue can be reproduced using a 1080p modeset by:
- Scale a 1280x720 NV12 framebuffer to 1920x1080 on win0
- Disable win0
- Display a 1920x1080 NV12 framebuffer without scaling on win0
- Output will now show the framebuffer distorted

And by:
- Scale a 1280x720 NV12 framebuffer to 1920x1080
- Change to a 720p modeset (win gets disabled and scaling reset to none)
- Output will now show the framebuffer distorted

Fix this by setting scale mode to none when win is disabled.

Fixes: 4c156c21c794 ("drm/rockchip: vop: support plane scale")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jonas Karlman <jonas@xxxxxxxxx>
Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/AM3PR03MB0966DE3E19BACE07328CD637AC7D0@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c |   18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -505,6 +505,18 @@ static void vop_core_clks_disable(struct
 	clk_disable(vop->hclk);
 }
 
+static void vop_win_disable(struct vop *vop, const struct vop_win_data *win)
+{
+	if (win->phy->scl && win->phy->scl->ext) {
+		VOP_SCL_SET_EXT(vop, win, yrgb_hor_scl_mode, SCALE_NONE);
+		VOP_SCL_SET_EXT(vop, win, yrgb_ver_scl_mode, SCALE_NONE);
+		VOP_SCL_SET_EXT(vop, win, cbcr_hor_scl_mode, SCALE_NONE);
+		VOP_SCL_SET_EXT(vop, win, cbcr_ver_scl_mode, SCALE_NONE);
+	}
+
+	VOP_WIN_SET(vop, win, enable, 0);
+}
+
 static int vop_enable(struct drm_crtc *crtc)
 {
 	struct vop *vop = to_vop(crtc);
@@ -550,7 +562,7 @@ static int vop_enable(struct drm_crtc *c
 		struct vop_win *vop_win = &vop->win[i];
 		const struct vop_win_data *win = vop_win->data;
 
-		VOP_WIN_SET(vop, win, enable, 0);
+		vop_win_disable(vop, win);
 	}
 	spin_unlock(&vop->reg_lock);
 
@@ -694,7 +706,7 @@ static void vop_plane_atomic_disable(str
 
 	spin_lock(&vop->reg_lock);
 
-	VOP_WIN_SET(vop, win, enable, 0);
+	vop_win_disable(vop, win);
 
 	spin_unlock(&vop->reg_lock);
 }
@@ -1449,7 +1461,7 @@ static int vop_initial(struct vop *vop)
 		int channel = i * 2 + 1;
 
 		VOP_WIN_SET(vop, win, channel, (channel + 1) << 4 | channel);
-		VOP_WIN_SET(vop, win, enable, 0);
+		vop_win_disable(vop, win);
 		VOP_WIN_SET(vop, win, gate, 1);
 	}