[PATCH 1/4] drm/amd/display: Adjust plane init for off by one error

[Mario Limonciello]

From: Mario Limonciello <mario.limonciello at amd.com>

The number of active surfaces is initialized to the number
of active planes.  If the number of planes aren't initialized
properly then the last plane can end up not getting initialized
which can be a divide by zero error.

Reported-and-tested-by: Luke Jones <luke at ljones.dev>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3794
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3533
Fixes: 7966f319c66d9 ("drm/amd/display: Introduce DML2")
Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c b/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c
index 8dabb1ac0b684..45147b812d7d9 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c
@@ -6787,7 +6787,7 @@ dml_bool_t dml_core_mode_support(struct display_mode_lib_st *mode_lib)
 		}
 	}
 
-	for (k = 0; k <= mode_lib->ms.num_active_planes - 1; k++) {
+	for (k = 0; k <= mode_lib->ms.num_active_planes; k++) {
 		CalculateBytePerPixelAndBlockSizes(
 								mode_lib->ms.cache_display_cfg.surface.SourcePixelFormat[k],
 								mode_lib->ms.cache_display_cfg.surface.SurfaceTiling[k],
-- 
2.43.0