From: Sung Lee Date: Wed, 25 Mar 2020 18:44:25 +0000 (-0400) Subject: drm/amd/display: Cap certain DML values for Low Pix Clk on DCN2.1 X-Git-Tag: v5.8-rc1~194^2~15^2~45 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=06535a48e297f43ce5d188afde108fa768010b0c;p=thirdparty%2Fkernel%2Flinux.git drm/amd/display: Cap certain DML values for Low Pix Clk on DCN2.1 [WHY] In certain conditions with low pixel clock, some values in DML may go past the max due to margining for latency hiding. This causes assertions to get hit. [HOW] If the pixel clock is low and some values are high, cap it to the max. Signed-off-by: Sung Lee Reviewed-by: Dmytro Laktyushkin Acked-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c index 5430ced02bac4..193f31b8ac4a7 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn21/display_rq_dlg_calc_21.c @@ -1490,13 +1490,21 @@ static void dml_rq_dlg_get_dlg_params( disp_dlg_regs->refcyc_per_pte_group_vblank_l = (unsigned int) (dst_y_per_row_vblank * (double) htotal * ref_freq_to_pix_freq / (double) dpte_groups_per_row_ub_l); - ASSERT(disp_dlg_regs->refcyc_per_pte_group_vblank_l < (unsigned int)dml_pow(2, 13)); + if ((refclk_freq_in_mhz / ref_freq_to_pix_freq < 28) && + disp_dlg_regs->refcyc_per_pte_group_vblank_l >= (unsigned int)dml_pow(2, 13)) + disp_dlg_regs->refcyc_per_pte_group_vblank_l = (1 << 13) - 1; + else + ASSERT(disp_dlg_regs->refcyc_per_pte_group_vblank_l < (unsigned int)dml_pow(2, 13)); if (dual_plane) { disp_dlg_regs->refcyc_per_pte_group_vblank_c = (unsigned int) (dst_y_per_row_vblank * (double) htotal * ref_freq_to_pix_freq / (double) dpte_groups_per_row_ub_c); - ASSERT(disp_dlg_regs->refcyc_per_pte_group_vblank_c + if ((refclk_freq_in_mhz / ref_freq_to_pix_freq < 28) && + disp_dlg_regs->refcyc_per_pte_group_vblank_c >= (unsigned int)dml_pow(2, 13)) + disp_dlg_regs->refcyc_per_pte_group_vblank_c = (1 << 13) - 1; + else + ASSERT(disp_dlg_regs->refcyc_per_pte_group_vblank_c < (unsigned int)dml_pow(2, 13)); }