From: Nicholas Kazlauskas nicholas.kazlauskas@amd.com
[ Upstream commit 72d7a7fa1f2404fd31c84a8f808b1b37021a3a9e ]
[Why] We should never apply a minimum dispclk value while in prepare_bandwidth or while displays are active. This is always an optimization for when all displays are disabled.
[How] Defer dispclk optimization until safe_to_lower = true and display_count reaches 0.
Since 0 has a special value in this logic (ie. no dispclk required) we also need adjust the logic that clamps it for the actual request to PMFW.
Reviewed-by: Gabe Teeger gabe.teeger@amd.com Reviewed-by: Leo Chen leo.chen@amd.com Reviewed-by: Syed Hassan syed.hassan@amd.com Signed-off-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Signed-off-by: Roman Li roman.li@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 --- .../amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c index 1648226586e22..1f47931c2dafc 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c @@ -467,14 +467,19 @@ void dcn35_update_clocks(struct clk_mgr *clk_mgr_base, update_dppclk = true; }
- if (should_set_clock(safe_to_lower, new_clocks->dispclk_khz, clk_mgr_base->clks.dispclk_khz)) { + if (should_set_clock(safe_to_lower, new_clocks->dispclk_khz, clk_mgr_base->clks.dispclk_khz) && + (new_clocks->dispclk_khz > 0 || (safe_to_lower && display_count == 0))) { + int requested_dispclk_khz = new_clocks->dispclk_khz; + dcn35_disable_otg_wa(clk_mgr_base, context, safe_to_lower, true);
- if (dc->debug.min_disp_clk_khz > 0 && new_clocks->dispclk_khz < dc->debug.min_disp_clk_khz) - new_clocks->dispclk_khz = dc->debug.min_disp_clk_khz; + /* Clamp the requested clock to PMFW based on their limit. */ + if (dc->debug.min_disp_clk_khz > 0 && requested_dispclk_khz < dc->debug.min_disp_clk_khz) + requested_dispclk_khz = dc->debug.min_disp_clk_khz;
+ dcn35_smu_set_dispclk(clk_mgr, requested_dispclk_khz); clk_mgr_base->clks.dispclk_khz = new_clocks->dispclk_khz; - dcn35_smu_set_dispclk(clk_mgr, clk_mgr_base->clks.dispclk_khz); + dcn35_disable_otg_wa(clk_mgr_base, context, safe_to_lower, false);
update_dispclk = true;