From: Chris Park Date: Tue, 4 Jun 2024 18:25:14 +0000 (-0400) Subject: drm/amd/display: On clock init, maintain DISPCLK freq X-Git-Tag: v6.11-rc1~141^2~18^2~43 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3838c6736524c903a95cd1d46fcbbcb6cae8e42f;p=thirdparty%2Fkernel%2Flinux.git drm/amd/display: On clock init, maintain DISPCLK freq [Why] 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). [How] Read the current DISPCLK freq and request the same value to ensure the timing is valid and unchanged. Reviewed-by: Alvin Lee Acked-by: Hamza Mahfooz Signed-off-by: Chris Park Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dcn401_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dcn401_clk_mgr.c index cd1c30fa783a1..70f06a7c882e8 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dcn401_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn401/dcn401_clk_mgr.c @@ -1459,6 +1459,22 @@ static int dcn401_get_dtb_ref_freq_khz(struct clk_mgr *clk_mgr_base) return dtb_ref_clk_khz; } +static int dcn401_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 struct clk_mgr_funcs dcn401_funcs = { .get_dp_ref_clk_frequency = dce12_get_dp_ref_freq_khz, .get_dtb_ref_clk_frequency = dcn401_get_dtb_ref_freq_khz, @@ -1472,6 +1488,7 @@ static struct clk_mgr_funcs dcn401_funcs = { .are_clock_states_equal = dcn401_are_clock_states_equal, .enable_pme_wa = dcn401_enable_pme_wa, .is_smu_present = dcn401_is_smu_present, + .get_dispclk_from_dentist = dcn401_get_dispclk_from_dentist, }; struct clk_mgr_internal *dcn401_clk_mgr_construct( 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 4d0c01e866be9..e7d6d987e3d3f 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 @@ -57,7 +57,16 @@ static void dcn401_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; + 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;