From 85e148fb963d27152a14e6d399a47aed9bc99c15 Mon Sep 17 00:00:00 2001 From: Tony Cheng Date: Tue, 28 Jan 2020 16:00:22 +0800 Subject: [PATCH] drm/amd/display: fix workaround for incorrect double buffer register for DLG ADL and TTU [Why] these registers should have been double buffered. SW workaround we will have SW program the more aggressive (lower) values whenever we are upating this register, so we will not have underflow at expense of less optimzal request pattern. [How] there is a driver bug where we don't check for 0, which is uninitialzed HW default. since 0 is smaller than any value we need to program, driver end up with not programming these registers Signed-off-by: Tony Cheng Reviewed-by: Yongqiang Sun Acked-by: Bhawanpreet Lakha Signed-off-by: Alex Deucher --- .../gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c | 35 +++++++++++++------ 1 file changed, 25 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c index cf09b93357280..aa7b0e7eb945d 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c +++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hubp.c @@ -79,32 +79,47 @@ void apply_DEDCN21_142_wa_for_hostvm_deadline( struct _vcs_dpi_display_dlg_regs_st *dlg_attr) { struct dcn21_hubp *hubp21 = TO_DCN21_HUBP(hubp); - uint32_t cur_value; + uint32_t refcyc_per_vm_group_vblank; + uint32_t refcyc_per_vm_req_vblank; + uint32_t refcyc_per_vm_group_flip; + uint32_t refcyc_per_vm_req_flip; + const uint32_t uninitialized_hw_default = 0; - REG_GET(VBLANK_PARAMETERS_5, REFCYC_PER_VM_GROUP_VBLANK, &cur_value); - if (cur_value > dlg_attr->refcyc_per_vm_group_vblank) + REG_GET(VBLANK_PARAMETERS_5, + REFCYC_PER_VM_GROUP_VBLANK, &refcyc_per_vm_group_vblank); + + if (refcyc_per_vm_group_vblank == uninitialized_hw_default || + refcyc_per_vm_group_vblank > dlg_attr->refcyc_per_vm_group_vblank) REG_SET(VBLANK_PARAMETERS_5, 0, REFCYC_PER_VM_GROUP_VBLANK, dlg_attr->refcyc_per_vm_group_vblank); REG_GET(VBLANK_PARAMETERS_6, - REFCYC_PER_VM_REQ_VBLANK, - &cur_value); - if (cur_value > dlg_attr->refcyc_per_vm_req_vblank) + REFCYC_PER_VM_REQ_VBLANK, &refcyc_per_vm_req_vblank); + + if (refcyc_per_vm_req_vblank == uninitialized_hw_default || + refcyc_per_vm_req_vblank > dlg_attr->refcyc_per_vm_req_vblank) REG_SET(VBLANK_PARAMETERS_6, 0, REFCYC_PER_VM_REQ_VBLANK, dlg_attr->refcyc_per_vm_req_vblank); - REG_GET(FLIP_PARAMETERS_3, REFCYC_PER_VM_GROUP_FLIP, &cur_value); - if (cur_value > dlg_attr->refcyc_per_vm_group_flip) + REG_GET(FLIP_PARAMETERS_3, + REFCYC_PER_VM_GROUP_FLIP, &refcyc_per_vm_group_flip); + + if (refcyc_per_vm_group_flip == uninitialized_hw_default || + refcyc_per_vm_group_flip > dlg_attr->refcyc_per_vm_group_flip) REG_SET(FLIP_PARAMETERS_3, 0, REFCYC_PER_VM_GROUP_FLIP, dlg_attr->refcyc_per_vm_group_flip); - REG_GET(FLIP_PARAMETERS_4, REFCYC_PER_VM_REQ_FLIP, &cur_value); - if (cur_value > dlg_attr->refcyc_per_vm_req_flip) + REG_GET(FLIP_PARAMETERS_4, + REFCYC_PER_VM_REQ_FLIP, &refcyc_per_vm_req_flip); + + if (refcyc_per_vm_req_flip == uninitialized_hw_default || + refcyc_per_vm_req_flip > dlg_attr->refcyc_per_vm_req_flip) REG_SET(FLIP_PARAMETERS_4, 0, REFCYC_PER_VM_REQ_FLIP, dlg_attr->refcyc_per_vm_req_flip); REG_SET(FLIP_PARAMETERS_5, 0, REFCYC_PER_PTE_GROUP_FLIP_C, dlg_attr->refcyc_per_pte_group_flip_c); + REG_SET(FLIP_PARAMETERS_6, 0, REFCYC_PER_META_CHUNK_FLIP_C, dlg_attr->refcyc_per_meta_chunk_flip_c); } -- 2.30.2