From 694c79769cb384bca8b1ec1d1e84156e726bd106 Mon Sep 17 00:00:00 2001
From: Aurabindo Pillai <aurabindo.pillai@amd.com>
Date: Fri, 18 Oct 2024 10:52:16 -0400
Subject: [PATCH] drm/amd/display: parse umc_info or vram_info based on ASIC
An upstream bug report suggests that there are production dGPUs that are
older than DCN401 but still have a umc_info in VBIOS tables with the
same version as expected for a DCN401 product. Hence, reading this
tables should be guarded with a version check.
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3678
Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 2551b4a321a68134360b860113dd460133e856e5)
Fixes: 00c391102abc ("drm/amd/display: Add misc DC changes for DCN401")
Cc: stable@vger.kernel.org # 6.11.x
---
drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
index 0d8498ab9b235..be8fbb04ad98f 100644
--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
@@ -3127,7 +3127,9 @@ static enum bp_result bios_parser_get_vram_info(
struct atom_data_revision revision;
// vram info moved to umc_info for DCN4x
- if (info && DATA_TABLES(umc_info)) {
+ if (dcb->ctx->dce_version >= DCN_VERSION_4_01 &&
+ dcb->ctx->dce_version < DCN_VERSION_MAX &&
+ info && DATA_TABLES(umc_info)) {
header = GET_IMAGE(struct atom_common_table_header,
DATA_TABLES(umc_info));
--
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