From ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 Mon Sep 17 00:00:00 2001 From: Daniel Sa Date: Fri, 19 Jul 2024 13:39:09 -0400 Subject: [PATCH] drm/amd/display: Underflow Seen on DCN401 eGPU [WHY] In dcn401 we read clock values before FW is loaded. These incorrect values cause the driver to believe that we are running higher clocks than what we actually have. This then causes corruption/underflow for the eGPU. [HOW] When new values are read from HW, update internal structures to propagate the new/correct value. Fixes issue Signed-off-by: Daniel Sa Reviewed-by: Alvin Lee Tested-by: Daniel Wheeler Signed-off-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c index 8e1ca709d304..ceaaa8df3641 100644 --- a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c @@ -221,6 +221,7 @@ void dcn401_init_hw(struct dc *dc) int edp_num; uint32_t backlight = MAX_BACKLIGHT_LEVEL; uint32_t user_level = MAX_BACKLIGHT_LEVEL; + int current_dchub_ref_freq = 0; if (dc->clk_mgr && dc->clk_mgr->funcs && dc->clk_mgr->funcs->init_clocks) { dc->clk_mgr->funcs->init_clocks(dc->clk_mgr); @@ -264,6 +265,8 @@ void dcn401_init_hw(struct dc *dc) dc->ctx->dc_bios->fw_info.pll_info.crystal_frequency, &res_pool->ref_clocks.dccg_ref_clock_inKhz); + current_dchub_ref_freq = res_pool->ref_clocks.dchub_ref_clock_inKhz / 1000; + (res_pool->hubbub->funcs->get_dchub_ref_freq)(res_pool->hubbub, res_pool->ref_clocks.dccg_ref_clock_inKhz, &res_pool->ref_clocks.dchub_ref_clock_inKhz); @@ -433,8 +436,9 @@ void dcn401_init_hw(struct dc *dc) dc->caps.dmub_caps.mclk_sw = dc->ctx->dmub_srv->dmub->feature_caps.fw_assisted_mclk_switch_ver > 0; dc->caps.dmub_caps.fams_ver = dc->ctx->dmub_srv->dmub->feature_caps.fw_assisted_mclk_switch_ver; dc->debug.fams2_config.bits.enable &= dc->ctx->dmub_srv->dmub->feature_caps.fw_assisted_mclk_switch_ver == 2; - if (!dc->debug.fams2_config.bits.enable && dc->res_pool->funcs->update_bw_bounding_box) { - /* update bounding box if FAMS2 disabled */ + if ((!dc->debug.fams2_config.bits.enable && dc->res_pool->funcs->update_bw_bounding_box) + || res_pool->ref_clocks.dchub_ref_clock_inKhz / 1000 != current_dchub_ref_freq) { + /* update bounding box if FAMS2 disabled, or if dchub clk has changed */ if (dc->clk_mgr) dc->res_pool->funcs->update_bw_bounding_box(dc, dc->clk_mgr->bw_params); -- 2.49.0