drm/amd/display: flicking observed while installing driver on Navi10 CF

[WHY] value of dchub_ref_clock is decided by dchubbub global timer
settings which is programmed by vbios command table disp_init.
for multi-GPU case, vbios is posted only for primary GPU. without
vbios posted for the secondary GPU, value of dchub_ref_clock is not
set properly. this value will affect dcn bandwidth calcuation and
cause underflow. user will see screen flicking during driver
installation for dual GPU case.

[HOW] dc init_hw always call vbios command table disp_init to
make sure dchubbub global timer is configured and enable.

Signed-off-by: hersen wu <hersenxs.wu@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index f7d8edc..5fb0c3d 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -172,6 +172,7 @@ struct resource_pool *dc_create_resource_pool(struct dc  *dc,
        default:
                break;
        }
+
        if (res_pool != NULL) {
                if (dc->ctx->dc_bios->fw_info_valid) {
                        res_pool->ref_clocks.xtalin_clock_inKhz =

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
index bd2a83e..60123db 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
@@ -1209,34 +1209,34 @@ static void dcn10_init_hw(struct dc *dc)
                return;
        }
 
-       if (!dcb->funcs->is_accelerated_mode(dcb)) {
-               dc->hwss.bios_golden_init(dc);
-               if (dc->ctx->dc_bios->fw_info_valid) {
-                       res_pool->ref_clocks.xtalin_clock_inKhz =
-                                       dc->ctx->dc_bios->fw_info.pll_info.crystal_frequency;
-
-                       if (!IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment)) {
-                               if (res_pool->dccg && res_pool->hubbub) {
-
-                                       (res_pool->dccg->funcs->get_dccg_ref_freq)(res_pool->dccg,
-                                                       dc->ctx->dc_bios->fw_info.pll_info.crystal_frequency,
-                                                       &res_pool->ref_clocks.dccg_ref_clock_inKhz);
-
-                                       (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);
-                               } else {
-                                       // Not all ASICs have DCCG sw component
-                                       res_pool->ref_clocks.dccg_ref_clock_inKhz =
-                                                       res_pool->ref_clocks.xtalin_clock_inKhz;
-                                       res_pool->ref_clocks.dchub_ref_clock_inKhz =
-                                                       res_pool->ref_clocks.xtalin_clock_inKhz;
-                               }
-                       }
-               } else
-                       ASSERT_CRITICAL(false);
+       if (!dcb->funcs->is_accelerated_mode(dcb))
                dc->hwss.disable_vga(dc->hwseq);
-       }
+
+       dc->hwss.bios_golden_init(dc);
+       if (dc->ctx->dc_bios->fw_info_valid) {
+               res_pool->ref_clocks.xtalin_clock_inKhz =
+                               dc->ctx->dc_bios->fw_info.pll_info.crystal_frequency;
+
+               if (!IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment)) {
+                       if (res_pool->dccg && res_pool->hubbub) {
+
+                               (res_pool->dccg->funcs->get_dccg_ref_freq)(res_pool->dccg,
+                                               dc->ctx->dc_bios->fw_info.pll_info.crystal_frequency,
+                                               &res_pool->ref_clocks.dccg_ref_clock_inKhz);
+
+                               (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);
+                       } else {
+                               // Not all ASICs have DCCG sw component
+                               res_pool->ref_clocks.dccg_ref_clock_inKhz =
+                                               res_pool->ref_clocks.xtalin_clock_inKhz;
+                               res_pool->ref_clocks.dchub_ref_clock_inKhz =
+                                               res_pool->ref_clocks.xtalin_clock_inKhz;
+                       }
+               }
+       } else
+               ASSERT_CRITICAL(false);
 
        for (i = 0; i < dc->link_count; i++) {
                /* Power up AND update implementation according to the