[PATCH] drm/mediatek: only touch DISP_REG_OVL_PITCH_MSB if AFBC is supported

[Daniel Golle <daniel@makrotopia.org>]

Touching DISP_REG_OVL_PITCH_MSB leads to video overlay on MT2701, MT7623N
and probably other older SoCs being broken.

Only touching it on hardware which actually supports AFBC like it was
before commit c410fa9b07c3 ("drm/mediatek: Add AFBC support to Mediatek
DRM driver") fixes it.

Fixes: c410fa9b07c3 ("drm/mediatek: Add AFBC support to Mediatek DRM driver")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index f731d4fbe8b6..321b40a387cd 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -545,7 +545,7 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int idx,
 				      &ovl->cmdq_reg, ovl->regs, DISP_REG_OVL_PITCH_MSB(idx));
 		mtk_ddp_write_relaxed(cmdq_pkt, hdr_pitch, &ovl->cmdq_reg, ovl->regs,
 				      DISP_REG_OVL_HDR_PITCH(ovl, idx));
-	} else {
+	} else if (ovl->data->supports_afbc) {
 		mtk_ddp_write_relaxed(cmdq_pkt,
 				      overlay_pitch.split_pitch.msb,
 				      &ovl->cmdq_reg, ovl->regs, DISP_REG_OVL_PITCH_MSB(idx));
-- 
2.47.1