From: Daniel Sa Daniel.Sa@amd.com
[ Upstream commit ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 ]
[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 Daniel.Sa@amd.com Reviewed-by: Alvin Lee alvin.lee2@amd.com Tested-by: Daniel Wheeler daniel.wheeler@amd.com Signed-off-by: Rodrigo Siqueira rodrigo.siqueira@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 324e77ceaf1cf..537a24ec74c85 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); @@ -436,8 +439,9 @@ 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);