meta-xilinx/meta-xilinx-contrib/recipes-kernel/linux/linux-xlnx/v2020.2/0003-drm-xilinx-Fix-DPMS-transition-to-on.patch

From 1a18e2b514ae9e75145597ac509a87f656c976ba Mon Sep 17 00:00:00 2001
From: Nathan Rossi <nathan@nathanrossi.com>
Date: Mon, 2 May 2016 23:46:42 +1000
Subject: [PATCH 3/3] drm: xilinx: Fix DPMS transition to on

Fix the issues where the VTC is reset (losing its timing config).

Also fix the issue where the plane destroys its DMA descriptors and
marks the DMA channels as inactive but never recreates the descriptors
and never updates the active state when turning DPMS back on.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Upstream-Status: Pending [This is a workaround]
---
 drivers/gpu/drm/xilinx/xilinx_drm_crtc.c  | 1 -
 drivers/gpu/drm/xilinx/xilinx_drm_plane.c | 3 ++-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/xilinx/xilinx_drm_crtc.c b/drivers/gpu/drm/xilinx/xilinx_drm_crtc.c
index 631d35b921..93dbd4b58a 100644
--- a/drivers/gpu/drm/xilinx/xilinx_drm_crtc.c
+++ b/drivers/gpu/drm/xilinx/xilinx_drm_crtc.c
@@ -88,7 +88,6 @@ static void xilinx_drm_crtc_dpms(struct drm_crtc *base_crtc, int dpms)
 	default:
 		if (crtc->vtc) {
 			xilinx_vtc_disable(crtc->vtc);
-			xilinx_vtc_reset(crtc->vtc);
 		}
 		if (crtc->cresample) {
 			xilinx_cresample_disable(crtc->cresample);
diff --git a/drivers/gpu/drm/xilinx/xilinx_drm_plane.c b/drivers/gpu/drm/xilinx/xilinx_drm_plane.c
index 6a248b72d4..d2518a4bdf 100644
--- a/drivers/gpu/drm/xilinx/xilinx_drm_plane.c
+++ b/drivers/gpu/drm/xilinx/xilinx_drm_plane.c
@@ -140,7 +140,7 @@ void xilinx_drm_plane_commit(struct drm_plane *base_plane)
 	for (i = 0; i < MAX_NUM_SUB_PLANES; i++) {
 		struct xilinx_drm_plane_dma *dma = &plane->dma[i];
 
-		if (dma->chan && dma->is_active) {
+		if (dma->chan) {
 			flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 			desc = dmaengine_prep_interleaved_dma(dma->chan,
 							      &dma->xt,
@@ -153,6 +153,7 @@ void xilinx_drm_plane_commit(struct drm_plane *base_plane)
 			dmaengine_submit(desc);
 
 			dma_async_issue_pending(dma->chan);
+			dma->is_active = true;
 		}
 	}
 }
-- 
2.14.2