drm/amd/display: Fix HDMI VSIF V3 incorrect issue

[ Upstream commit 0591183699fceeafb4c4141072d47775de83ecfb ]

[Why]
Reported from customer the checksum in AMD VSIF V3 is incorrect and
causing blank screen issue.

[How]
Fix the packet length issue on AMD HDMI VSIF V3.

Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Leo Ma <hanghong.ma@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index b99aa23..4bee6d0 100644 (file)
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -567,10 +567,6 @@ static void build_vrr_infopacket_data_v1(const struct mod_vrr_params *vrr,
         * Note: We should never go above the field rate of the mode timing set.
         */
        infopacket->sb[8] = (unsigned char)((vrr->max_refresh_in_uhz + 500000) / 1000000);
-
-       /* FreeSync HDR */
-       infopacket->sb[9] = 0;
-       infopacket->sb[10] = 0;
 }
 
 static void build_vrr_infopacket_data_v3(const struct mod_vrr_params *vrr,
@@ -638,10 +634,6 @@ static void build_vrr_infopacket_data_v3(const struct mod_vrr_params *vrr,
 
        /* PB16 : Reserved bits 7:1, FixedRate bit 0 */
        infopacket->sb[16] = (vrr->state == VRR_STATE_ACTIVE_FIXED) ? 1 : 0;
-
-       //FreeSync HDR
-       infopacket->sb[9] = 0;
-       infopacket->sb[10] = 0;
 }
 
 static void build_vrr_infopacket_fs2_data(enum color_transfer_func app_tf,
@@ -726,8 +718,7 @@ static void build_vrr_infopacket_header_v2(enum signal_type signal,
                /* HB2  = [Bits 7:5 = 0] [Bits 4:0 = Length = 0x09] */
                infopacket->hb2 = 0x09;
 
-               *payload_size = 0x0A;
-
+               *payload_size = 0x09;
        } else if (dc_is_dp_signal(signal)) {
 
                /* HEADER */
@@ -776,9 +767,9 @@ static void build_vrr_infopacket_header_v3(enum signal_type signal,
                infopacket->hb1 = version;
 
                /* HB2  = [Bits 7:5 = 0] [Bits 4:0 = Length] */
-               *payload_size = 0x10;
-               infopacket->hb2 = *payload_size - 1; //-1 for checksum
+               infopacket->hb2 = 0x10;
 
+               *payload_size = 0x10;
        } else if (dc_is_dp_signal(signal)) {
 
                /* HEADER */