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drm/amd/display: limit timing for single dimm memory

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[ 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@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Daniel Miess <Daniel.Miess@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniel Miess 2023-04-04 14:04:11 -04:00 committed by Greg Kroah-Hartman
parent 5e1574aa06
commit 2abff94db2
1 changed files with 20 additions and 0 deletions
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20
drivers/gpu/drm/amd/display/dc/dcn314/dcn314_resource.c
View File

@ -1689,6 +1689,23 @@ 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)
@ -1704,6 +1721,9 @@ 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);