From d408874575d5a406bbbfa8f7e5706fd6891f73b3 Mon Sep 17 00:00:00 2001 From: Nicholas Kazlauskas Date: Fri, 21 Sep 2018 09:35:24 -0400 Subject: [PATCH 5500/5725] drm/amd/display: Raise dispclk value for dce_update_clocks [Why] The DISPCLK value was previously requested to be 15% higher for all ASICS that went through the dce110 bandwidth code path. As part of a refactoring of dce_clocks and dce110 set_bandwidth this was removed for power saving considerations. This changed caused corruption under certain display configurations. Originally thought to be Vega specific, it was also observed on Polaris. [How] The 15% is brought back but its placement differs from the original patch. This boost should only be enable while DFS bypass is inactive. This (like the Vega patch) is also a workaround that should be removed after the root cause is identified. Signed-off-by: Nicholas Kazlauskas Reviewed-by: Harry Wentland Acked-by: Leo Li --- drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c b/drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c index aa6bd41..fb962503 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_clocks.c @@ -658,6 +658,11 @@ static void dce_update_clocks(struct dccg *dccg, bool safe_to_lower) { struct dm_pp_power_level_change_request level_change_req; + struct dce_dccg *clk_dce = TO_DCE_CLOCKS(dccg); + + /* TODO: Investigate why this is needed to fix display corruption. */ + if (!clk_dce->dfs_bypass_active) + new_clocks->dispclk_khz = new_clocks->dispclk_khz * 115 / 100; level_change_req.power_level = dce_get_required_clocks_state(dccg, new_clocks); /* get max clock state from PPLIB */ -- 2.7.4