From: Daniel Miess <Daniel.Miess@xxxxxxx>
[ Upstream commit 1e994cc0956b8dabd1b1fef315bbd722733b8aa8 ]
[Why]
1. It could hit bandwidth limitdation under single dimm
memory when connecting 8K external monitor.
2. IsSupportedVidPn got validation failed with
2K240Hz eDP + 8K24Hz external monitor.
3. It's better to filter out such combination in
EnumVidPnCofuncModality
4. For short term, filter out in dc bandwidth validation.
[How]
Force 2K@240Hz+8K@24Hz timing validation false in dc.
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@xxxxxxx>
Acked-by: Qingqing Zhuo <qingqing.zhuo@xxxxxxx>
Signed-off-by: Daniel Miess <Daniel.Miess@xxxxxxx>
Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
.../amd/display/dc/dcn314/dcn314_resource.c | 20 +++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
index 54ed3de869d3b..9ffba4c6fe550 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
@@ -1697,6 +1697,23 @@ static void dcn314_get_panel_config_defaults(struct dc_panel_config *panel_confi
*panel_config = panel_config_defaults;
}
+static bool filter_modes_for_single_channel_workaround(struct dc *dc,
+ struct dc_state *context)
+{
+ // Filter 2K@240Hz+8K@24fps above combination timing if memory only has single dimm LPDDR
+ if (dc->clk_mgr->bw_params->vram_type == 34 && dc->clk_mgr->bw_params->num_channels < 2) {
+ int total_phy_pix_clk = 0;
+
+ for (int i = 0; i < context->stream_count; i++)
+ if (context->res_ctx.pipe_ctx[i].stream)
+ total_phy_pix_clk += context->res_ctx.pipe_ctx[i].stream->phy_pix_clk;
+
+ if (total_phy_pix_clk >= (1148928+826260)) //2K@240Hz+8K@24fps
+ return true;
+ }
+ return false;
+}
+
bool dcn314_validate_bandwidth(struct dc *dc,
struct dc_state *context,
bool fast_validate)
@@ -1712,6 +1729,9 @@ bool dcn314_validate_bandwidth(struct dc *dc,
BW_VAL_TRACE_COUNT();
+ if (filter_modes_for_single_channel_workaround(dc, context))
+ goto validate_fail;
+
DC_FP_START();
// do not support self refresh only
out = dcn30_internal_validate_bw(dc, context, pipes, &pipe_cnt, &vlevel, fast_validate, false);
--
2.39.2
