drm/amd/display: Don't allow dual-link DVI on all ASICs.

Our APUs (Carrizo, Stoney, Raven) don't support it.

v2: Don't use is_apu as other ASICs might also not support it

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

6 files changed, 10 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index 539c3e0a6292..651c6bceb86d 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -45,8 +45,9 @@ static void update_stream_signal(struct dc_stream_state *stream)
                 stream->signal = dc_sink->sink_signal;
 
         if (dc_is_dvi_signal(stream->signal)) {
-                if (stream->timing.pix_clk_khz > TMDS_MAX_PIXEL_CLOCK_IN_KHZ_UPMOST &&
-                        stream->sink->sink_signal != SIGNAL_TYPE_DVI_SINGLE_LINK)
+                if (stream->ctx->dc->caps.dual_link_dvi &&
+                    stream->timing.pix_clk_khz > TMDS_MAX_PIXEL_CLOCK_IN_KHZ_UPMOST &&
+                    stream->sink->sink_signal != SIGNAL_TYPE_DVI_SINGLE_LINK)
                         stream->signal = SIGNAL_TYPE_DVI_DUAL_LINK;
                 else
                         stream->signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index e2e3c9df79ea..b5c8f510adb0 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -62,6 +62,7 @@ struct dc_caps {
         bool dcc_const_color;
         bool dynamic_audio;
         bool is_apu;
+        bool dual_link_dvi;
 };
 
 struct dc_dcc_surface_param {
diff --git a/drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c b/drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c
index 3ea43e2a9450..442dd2d93618 100644
--- a/drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c
@@ -852,6 +852,7 @@ static bool construct(
         dc->caps.max_downscale_ratio = 200;
         dc->caps.i2c_speed_in_khz = 40;
         dc->caps.max_cursor_size = 128;
+        dc->caps.dual_link_dvi = true;
 
         for (i = 0; i < pool->base.pipe_count; i++) {
                 pool->base.timing_generators[i] =
diff --git a/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c b/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
index 663e0a047a4b..98d9cd0109e1 100644
--- a/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c
@@ -1103,6 +1103,8 @@ static bool construct(
         dc->caps.max_downscale_ratio = 200;
         dc->caps.i2c_speed_in_khz = 100;
         dc->caps.max_cursor_size = 128;
+        dc->caps.dual_link_dvi = true;
+
 
         /*************************************************
          *  Create resources                             *
diff --git a/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c b/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
index 57cd67359567..5aab01db28ee 100644
--- a/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c
@@ -835,6 +835,8 @@ static bool construct(
         dc->caps.max_downscale_ratio = 200;
         dc->caps.i2c_speed_in_khz = 100;
         dc->caps.max_cursor_size = 128;
+        dc->caps.dual_link_dvi = true;
+
         dc->debug = debug_defaults;
 
         /*************************************************
diff --git a/drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c b/drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c
index 8f2bd56f3461..25d7eb1567ae 100644
--- a/drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c
@@ -793,6 +793,7 @@ static bool dce80_construct(
         dc->caps.max_downscale_ratio = 200;
         dc->caps.i2c_speed_in_khz = 40;
         dc->caps.max_cursor_size = 128;
+        dc->caps.dual_link_dvi = true;
 
         /*************************************************
          *  Create resources                             *