From d170e938f01fc8c5c41f8a12f0c12491580829ef Mon Sep 17 00:00:00 2001 From: Alvin Lee Date: Fri, 24 Mar 2023 12:01:09 -0400 Subject: [PATCH] drm/amd/display: On clock init, maintain DISPCLK freq [Description] - On init if a display is connected, we need to maintain the DISPCLK frequency - Even though DPG_EN=1, the display still requires the correct timing or it could cause audio corruption (if DISPCLK freq is reduced) - Read the current DISPCLK freq and request the same value to ensure the timing is valid and unchanged - However, add option to do a full pipe power down (including link) which will also avoid audio related issues - Disabled for the time being on dcn32 Reviewed-by: Jun Lei Acked-by: Qingqing Zhuo Signed-off-by: Alvin Lee Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- .../amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c | 18 +++++++++++++++ drivers/gpu/drm/amd/display/dc/dc.h | 1 + drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c | 26 +++++++++++++++++----- .../gpu/drm/amd/display/dc/dcn32/dcn32_resource.c | 1 + .../drm/amd/display/dc/dcn321/dcn321_resource.c | 1 + drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h | 3 +++ 6 files changed, 45 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c index af108f8..ea753f8 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c @@ -399,6 +399,23 @@ static void dcn32_update_clocks_update_dentist( } +static int dcn32_get_dispclk_from_dentist(struct clk_mgr *clk_mgr_base) +{ + struct clk_mgr_internal *clk_mgr = TO_CLK_MGR_INTERNAL(clk_mgr_base); + uint32_t dispclk_wdivider; + int disp_divider; + + REG_GET(DENTIST_DISPCLK_CNTL, DENTIST_DISPCLK_WDIVIDER, &dispclk_wdivider); + disp_divider = dentist_get_divider_from_did(dispclk_wdivider); + + /* Return DISPCLK freq in Khz */ + if (disp_divider) + return (DENTIST_DIVIDER_RANGE_SCALE_FACTOR * clk_mgr->base.dentist_vco_freq_khz) / disp_divider; + + return 0; +} + + static void dcn32_update_clocks(struct clk_mgr *clk_mgr_base, struct dc_state *context, bool safe_to_lower) @@ -852,6 +869,7 @@ static struct clk_mgr_funcs dcn32_funcs = { .are_clock_states_equal = dcn32_are_clock_states_equal, .enable_pme_wa = dcn32_enable_pme_wa, .is_smu_present = dcn32_is_smu_present, + .get_dispclk_from_dentist = dcn32_get_dispclk_from_dentist, }; void dcn32_clk_mgr_construct( diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h index 719727a..f51b9c2 100644 --- a/drivers/gpu/drm/amd/display/dc/dc.h +++ b/drivers/gpu/drm/amd/display/dc/dc.h @@ -877,6 +877,7 @@ struct dc_debug_options { bool support_eDP1_5; uint32_t fpo_vactive_margin_us; bool disable_fpo_vactive; + bool disable_boot_optimizations; }; struct gpu_info_soc_bounding_box_v1_0; diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c index b3824287..db0974f 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c @@ -721,10 +721,19 @@ static void dcn32_initialize_min_clocks(struct dc *dc) clocks->socclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].socclk_mhz * 1000; clocks->dramclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].memclk_mhz * 1000; clocks->dppclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dppclk_mhz * 1000; - clocks->dispclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dispclk_mhz * 1000; - clocks->ref_dtbclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dtbclk_mhz * 1000; - clocks->fclk_p_state_change_support = true; - clocks->p_state_change_support = true; + if (dc->debug.disable_boot_optimizations) { + clocks->dispclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dispclk_mhz * 1000; + } else { + /* Even though DPG_EN = 1 for the connected display, it still requires the + * correct timing so we cannot set DISPCLK to min freq or it could cause + * audio corruption. Read current DISPCLK from DENTIST and request the same + * freq to ensure that the timing is valid and unchanged. + */ + clocks->dispclk_khz = dc->clk_mgr->funcs->get_dispclk_from_dentist(dc->clk_mgr); + clocks->ref_dtbclk_khz = dc->clk_mgr->bw_params->clk_table.entries[0].dtbclk_mhz * 1000; + clocks->fclk_p_state_change_support = true; + clocks->p_state_change_support = true; + } dc->clk_mgr->funcs->update_clocks( dc->clk_mgr, @@ -823,7 +832,14 @@ void dcn32_init_hw(struct dc *dc) * everything down. */ if (dcb->funcs->is_accelerated_mode(dcb) || !dc->config.seamless_boot_edp_requested) { - hws->funcs.init_pipes(dc, dc->current_state); + /* Disable boot optimizations means power down everything including PHY, DIG, + * and OTG (i.e. the boot is not optimized because we do a full power down). + */ + if (dc->hwss.enable_accelerated_mode && dc->debug.disable_boot_optimizations) + dc->hwss.enable_accelerated_mode(dc, dc->current_state); + else + hws->funcs.init_pipes(dc, dc->current_state); + if (dc->res_pool->hubbub->funcs->allow_self_refresh_control) dc->res_pool->hubbub->funcs->allow_self_refresh_control(dc->res_pool->hubbub, !dc->res_pool->hubbub->ctx->dc->debug.disable_stutter); diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c index 99d417f..e30d1f6 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c @@ -728,6 +728,7 @@ static const struct dc_debug_options debug_defaults_drv = { .disable_fpo_optimizations = false, .fpo_vactive_margin_us = 2000, // 2000us .disable_fpo_vactive = true, + .disable_boot_optimizations = false, }; static const struct dc_debug_options debug_defaults_diags = { diff --git a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c index 7ebd14f..e5ab7f3 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c @@ -726,6 +726,7 @@ static const struct dc_debug_options debug_defaults_drv = { .disable_fpo_optimizations = false, .fpo_vactive_margin_us = 2000, // 2000us .disable_fpo_vactive = true, + .disable_boot_optimizations = false, }; static const struct dc_debug_options debug_defaults_diags = { diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h b/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h index 591ab13..bef843cc 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h +++ b/drivers/gpu/drm/amd/display/dc/inc/hw/clk_mgr.h @@ -293,6 +293,9 @@ struct clk_mgr_funcs { /* Get SMU present */ bool (*is_smu_present)(struct clk_mgr *clk_mgr); + + int (*get_dispclk_from_dentist)(struct clk_mgr *clk_mgr_base); + }; struct clk_mgr { -- 2.7.4