commit 3b1f4b189cf6f057f360b04c2e4ede4506019888
author Fabien Parent <fparent@baylibre.com> Thu Sep 17 19:52:45 2020 +0200
committer Cindy Liu <hcindyl@google.com> Wed Sep 30 12:46:25 2020 -0700
tree 5deaa66da39e4d61dd95157e80320864fee51cbd
parent a904637847a21fdb0421da986309c940a761522f

drm/mediatek: init RDMA with valid buffer

RDMA is initialized with buffer pointer 0. This creates IOMMU errors
when the DMA try to read this unmapped address.
Instead of initializing with 0, initialize it with some allocated
buffer address.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Change-Id: I98162ce1fe1b08eb602fce577bb0f146259b5f86

drivers/gpu/drm/mediatek/mtk_drm_crtc.c

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 98bc695..731ea04 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -300,12 +300,16 @@
 	/* Initially configure all planes */
 	for (i = 0; i < mtk_crtc->layer_nr; i++) {
 		struct drm_plane *plane = &mtk_crtc->planes[i];
+		struct drm_framebuffer *fb = plane->state->fb;
 		struct mtk_plane_state *plane_state;
 		struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
+		struct drm_gem_object *gem = fb->obj[0];
+		struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(gem);
 		unsigned int comp_layer_nr = mtk_ddp_comp_layer_nr(comp);
 		unsigned int local_layer;
 
 		plane_state = to_mtk_plane_state(plane->state);
+		plane_state->pending.addr = mtk_gem->dma_addr;
 
 		if (i >= comp_layer_nr) {
 			comp = mtk_crtc->ddp_comp[1];