From 48f7c50bb507a3b2a0476b27713f28c42d2ef9ae Mon Sep 17 00:00:00 2001
From: Ryan Seto <ryanseto@amd.com>
Date: Fri, 28 Feb 2025 15:52:42 -0500
Subject: [PATCH] drm/amd/display: Prevent VStartup Overflow
[WHY & HOW]
Fixed Overflow issue by clamping VStartup to max value of register.
Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Ryan Seto <ryanseto@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
---
drivers/gpu/drm/amd/display/dc/dml2/display_mode_core.c | 2 ++
1 file changed, 2 insertions(+)
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 84a2de9a76d4c..7ae9c0ba0c9e6 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
@@ -32,6 +32,7 @@
#define DML2_MAX_FMT_420_BUFFER_WIDTH 4096
#define TB_BORROWED_MAX 400
+#define DML_MAX_VSTARTUP_START 1023
// ---------------------------
// Declaration Begins
@@ -6210,6 +6211,7 @@ static dml_uint_t CalculateMaxVStartup(
dml_print("DML::%s: vblank_avail = %u\n", __func__, vblank_avail);
dml_print("DML::%s: max_vstartup_lines = %u\n", __func__, max_vstartup_lines);
#endif
+ max_vstartup_lines = (dml_uint_t) dml_min(max_vstartup_lines, DML_MAX_VSTARTUP_START);
return max_vstartup_lines;
}
--
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