The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Thanks, Sasha
------------------ original commit in Linus's tree ------------------
From 26fbcb3da77efc77bd7327b7916338d773cca484 Mon Sep 17 00:00:00 2001 From: Sohaib Nadeem sohaib.nadeem@amd.com Date: Wed, 14 Feb 2024 13:51:16 -0500 Subject: [PATCH] drm/amd/display: Override min required DCFCLK in dml1_validate
[WHY]: Increasing min DCFCLK addresses underflow issues that occur when phantom pipe is turned on for some Sub-Viewport configs
[HOW]: dcn32_override_min_req_dcfclk is added to override DCFCLK value in dml1_validate when subviewport is being used.
Cc: Mario Limonciello mario.limonciello@amd.com Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Reviewed-by: Alvin Lee alvin.lee2@amd.com Acked-by: Alex Hung alex.hung@amd.com Signed-off-by: Sohaib Nadeem sohaib.nadeem@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com --- .../gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c | 6 ++++++ .../gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c | 1 + .../gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.h | 3 +++ 3 files changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c index 87760600e154d..f98def6c8c2d2 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c @@ -782,3 +782,9 @@ void dcn32_update_dml_pipes_odm_policy_based_on_context(struct dc *dc, struct dc pipe_cnt++; } } + +void dcn32_override_min_req_dcfclk(struct dc *dc, struct dc_state *context) +{ + if (dcn32_subvp_in_use(dc, context) && context->bw_ctx.bw.dcn.clk.dcfclk_khz <= MIN_SUBVP_DCFCLK_KHZ) + context->bw_ctx.bw.dcn.clk.dcfclk_khz = MIN_SUBVP_DCFCLK_KHZ; +} diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c index 3f3951f3ba983..f844f57ecc49b 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.c @@ -1771,6 +1771,7 @@ static bool dml1_validate(struct dc *dc, struct dc_state *context, bool fast_val dc->res_pool->funcs->calculate_wm_and_dlg(dc, context, pipes, pipe_cnt, vlevel);
dcn32_override_min_req_memclk(dc, context); + dcn32_override_min_req_dcfclk(dc, context);
BW_VAL_TRACE_END_WATERMARKS();
diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.h b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.h index 0c87b0fabba7d..2258c5c7212d8 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.h +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn32/dcn32_resource.h @@ -42,6 +42,7 @@ #define SUBVP_ACTIVE_MARGIN_LIST_LEN 2 #define DCN3_2_MAX_SUBVP_PIXEL_RATE_MHZ 1800 #define DCN3_2_VMIN_DISPCLK_HZ 717000000 +#define MIN_SUBVP_DCFCLK_KHZ 400000
#define TO_DCN32_RES_POOL(pool)\ container_of(pool, struct dcn32_resource_pool, base) @@ -181,6 +182,8 @@ bool dcn32_subvp_vblank_admissable(struct dc *dc, struct dc_state *context, int
void dcn32_update_dml_pipes_odm_policy_based_on_context(struct dc *dc, struct dc_state *context, display_e2e_pipe_params_st *pipes);
+void dcn32_override_min_req_dcfclk(struct dc *dc, struct dc_state *context); + /* definitions for run time init of reg offsets */
/* CLK SRC */