From ef4e417eb3ec7fe657928f10ac1d2154d8a5fb38 Mon Sep 17 00:00:00 2001
From: Nicolin Chen <nicoleotsuka@gmail.com>
Date: Tue, 19 May 2020 02:03:01 -0700
Subject: [PATCH] drm/tegra: hub: Do not enable orphaned window group
Git-commit: ef4e417eb3ec7fe657928f10ac1d2154d8a5fb38
Patch-mainline: v5.8-rc3
References: bsc#1111666
Though the unconditional enable/disable code is not a final solution,
we don't want to run into a NULL pointer situation when window group
doesn't link to its DC parent if the DC is disabled in Device Tree.
So this patch simply adds a check to make sure that window group has
a valid parent before running into tegra_windowgroup_enable/disable.
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/tegra/hub.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/tegra/hub.c b/drivers/gpu/drm/tegra/hub.c
index 8183e617bf6b..a2ef8f218d4e 100644
--- a/drivers/gpu/drm/tegra/hub.c
+++ b/drivers/gpu/drm/tegra/hub.c
@@ -149,7 +149,9 @@ int tegra_display_hub_prepare(struct tegra_display_hub *hub)
for (i = 0; i < hub->soc->num_wgrps; i++) {
struct tegra_windowgroup *wgrp = &hub->wgrps[i];
- tegra_windowgroup_enable(wgrp);
+ /* Skip orphaned window group whose parent DC is disabled */
+ if (wgrp->parent)
+ tegra_windowgroup_enable(wgrp);
}
return 0;
@@ -166,7 +168,9 @@ void tegra_display_hub_cleanup(struct tegra_display_hub *hub)
for (i = 0; i < hub->soc->num_wgrps; i++) {
struct tegra_windowgroup *wgrp = &hub->wgrps[i];
- tegra_windowgroup_disable(wgrp);
+ /* Skip orphaned window group whose parent DC is disabled */
+ if (wgrp->parent)
+ tegra_windowgroup_disable(wgrp);
}
}
--
2.16.4