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Date: Thu, 21 Jul 2022 14:26:54 -0300
From: Maíra Canal <mairacanal@...eup.net>
To: Melissa Wen <mwen@...lia.com>, harry.wentland@....com,
sunpeng.li@....com, Rodrigo.Siqueira@....com,
alexander.deucher@....com, christian.koenig@....com,
Xinhui.Pan@....com, airlied@...ux.ie, daniel@...ll.ch
Cc: Guenter Roeck <linux@...ck-us.net>, kernel-dev@...lia.com,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] drm/amd/display: move FPU code from dcn301 clk mgr to
DML folder
Hi Melissa,
On 7/20/22 16:32, Melissa Wen wrote:
> The -mno-gnu-attribute option in dcn301 clk mgr makefile hides a soft vs
> hard fp error for powerpc. After removing this flag, we can see some FPU
> code remains there:
>
> gcc-11.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld:
> drivers/gpu/drm/amd/amdgpu/../display/dc/dml/display_mode_lib.o uses
> hard float,
> drivers/gpu/drm/amd/amdgpu/../display/dc/clk_mgr/dcn301/vg_clk_mgr.o
> uses soft float
>
> Therefore, remove the -mno-gnu-attribute flag for dcn301/powerpc and
> move FPU-associated code to DML folder.
>
> Signed-off-by: Melissa Wen <mwen@...lia.com>
> ---
> .../gpu/drm/amd/display/dc/clk_mgr/Makefile | 6 --
> .../display/dc/clk_mgr/dcn301/vg_clk_mgr.c | 86 ++-----------------
> .../display/dc/clk_mgr/dcn301/vg_clk_mgr.h | 3 +
> .../amd/display/dc/dml/dcn301/dcn301_fpu.c | 74 ++++++++++++++++
> 4 files changed, 84 insertions(+), 85 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile b/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile
> index 15b660a951a5..271d8e573181 100644
> --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile
> +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/Makefile
> @@ -123,12 +123,6 @@ AMD_DISPLAY_FILES += $(AMD_DAL_CLK_MGR_DCN30)
> ###############################################################################
> CLK_MGR_DCN301 = vg_clk_mgr.o dcn301_smu.o
>
> -# prevent build errors regarding soft-float vs hard-float FP ABI tags
> -# this code is currently unused on ppc64, as it applies to VanGogh APUs only
> -ifdef CONFIG_PPC64
> -CFLAGS_$(AMDDALPATH)/dc/clk_mgr/dcn301/vg_clk_mgr.o := $(call cc-option,-mno-gnu-attribute)
> -endif
> -
> AMD_DAL_CLK_MGR_DCN301 = $(addprefix $(AMDDALPATH)/dc/clk_mgr/dcn301/,$(CLK_MGR_DCN301))
>
> AMD_DISPLAY_FILES += $(AMD_DAL_CLK_MGR_DCN301)
> diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.c
> index f310b0d25a07..65f224af03c0 100644
> --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.c
> +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.c
> @@ -32,6 +32,10 @@
> // For dcn20_update_clocks_update_dpp_dto
> #include "dcn20/dcn20_clk_mgr.h"
>
> +// For DML FPU code
> +#include "dml/dcn20/dcn20_fpu.h"
> +#include "dml/dcn301/dcn301_fpu.h"
> +
I guess the "dml/dcn301/dcn301_fpu.h" header is not needed, as you only
use dcn21_clk_mgr_set_bw_params_wm_table and the structs are on the
source file.
Besides that, to the whole series:
Reviewed-by: Maíra Canal <mairacanal@...eup.net>
Best Regards,
- Maíra Canal
> #include "vg_clk_mgr.h"
> #include "dcn301_smu.h"
> #include "reg_helper.h"
> @@ -526,81 +530,6 @@ static struct clk_bw_params vg_bw_params = {
>
> };
>
> -static struct wm_table ddr4_wm_table = {
> - .entries = {
> - {
> - .wm_inst = WM_A,
> - .wm_type = WM_TYPE_PSTATE_CHG,
> - .pstate_latency_us = 11.72,
> - .sr_exit_time_us = 6.09,
> - .sr_enter_plus_exit_time_us = 7.14,
> - .valid = true,
> - },
> - {
> - .wm_inst = WM_B,
> - .wm_type = WM_TYPE_PSTATE_CHG,
> - .pstate_latency_us = 11.72,
> - .sr_exit_time_us = 10.12,
> - .sr_enter_plus_exit_time_us = 11.48,
> - .valid = true,
> - },
> - {
> - .wm_inst = WM_C,
> - .wm_type = WM_TYPE_PSTATE_CHG,
> - .pstate_latency_us = 11.72,
> - .sr_exit_time_us = 10.12,
> - .sr_enter_plus_exit_time_us = 11.48,
> - .valid = true,
> - },
> - {
> - .wm_inst = WM_D,
> - .wm_type = WM_TYPE_PSTATE_CHG,
> - .pstate_latency_us = 11.72,
> - .sr_exit_time_us = 10.12,
> - .sr_enter_plus_exit_time_us = 11.48,
> - .valid = true,
> - },
> - }
> -};
> -
> -static struct wm_table lpddr5_wm_table = {
> - .entries = {
> - {
> - .wm_inst = WM_A,
> - .wm_type = WM_TYPE_PSTATE_CHG,
> - .pstate_latency_us = 11.65333,
> - .sr_exit_time_us = 13.5,
> - .sr_enter_plus_exit_time_us = 16.5,
> - .valid = true,
> - },
> - {
> - .wm_inst = WM_B,
> - .wm_type = WM_TYPE_PSTATE_CHG,
> - .pstate_latency_us = 11.65333,
> - .sr_exit_time_us = 13.5,
> - .sr_enter_plus_exit_time_us = 16.5,
> - .valid = true,
> - },
> - {
> - .wm_inst = WM_C,
> - .wm_type = WM_TYPE_PSTATE_CHG,
> - .pstate_latency_us = 11.65333,
> - .sr_exit_time_us = 13.5,
> - .sr_enter_plus_exit_time_us = 16.5,
> - .valid = true,
> - },
> - {
> - .wm_inst = WM_D,
> - .wm_type = WM_TYPE_PSTATE_CHG,
> - .pstate_latency_us = 11.65333,
> - .sr_exit_time_us = 13.5,
> - .sr_enter_plus_exit_time_us = 16.5,
> - .valid = true,
> - },
> - }
> -};
> -
> -
> static unsigned int find_dcfclk_for_voltage(const struct vg_dpm_clocks *clock_table,
> unsigned int voltage)
> {
> @@ -670,10 +599,9 @@ static void vg_clk_mgr_helper_populate_bw_params(
> /*
> * WM set D will be re-purposed for memory retraining
> */
> - bw_params->wm_table.entries[WM_D].pstate_latency_us = LPDDR_MEM_RETRAIN_LATENCY;
> - bw_params->wm_table.entries[WM_D].wm_inst = WM_D;
> - bw_params->wm_table.entries[WM_D].wm_type = WM_TYPE_RETRAINING;
> - bw_params->wm_table.entries[WM_D].valid = true;
> + DC_FP_START();
> + dcn21_clk_mgr_set_bw_params_wm_table(bw_params);
> + DC_FP_END();
> }
>
> }
> diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.h b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.h
> index 7255477307f1..75884f572989 100644
> --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.h
> +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn301/vg_clk_mgr.h
> @@ -29,6 +29,9 @@
>
> struct watermarks;
>
> +extern struct wm_table ddr4_wm_table;
> +extern struct wm_table lpddr5_wm_table;
> +
> struct smu_watermark_set {
> struct watermarks *wm_set;
> union large_integer mc_address;
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn301/dcn301_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn301/dcn301_fpu.c
> index e4863f0bf0f6..7ef66e511ec8 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn301/dcn301_fpu.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn301/dcn301_fpu.c
> @@ -214,6 +214,80 @@ struct _vcs_dpi_soc_bounding_box_st dcn3_01_soc = {
> .urgent_latency_adjustment_fabric_clock_reference_mhz = 0,
> };
>
> +struct wm_table ddr4_wm_table = {
> + .entries = {
> + {
> + .wm_inst = WM_A,
> + .wm_type = WM_TYPE_PSTATE_CHG,
> + .pstate_latency_us = 11.72,
> + .sr_exit_time_us = 6.09,
> + .sr_enter_plus_exit_time_us = 7.14,
> + .valid = true,
> + },
> + {
> + .wm_inst = WM_B,
> + .wm_type = WM_TYPE_PSTATE_CHG,
> + .pstate_latency_us = 11.72,
> + .sr_exit_time_us = 10.12,
> + .sr_enter_plus_exit_time_us = 11.48,
> + .valid = true,
> + },
> + {
> + .wm_inst = WM_C,
> + .wm_type = WM_TYPE_PSTATE_CHG,
> + .pstate_latency_us = 11.72,
> + .sr_exit_time_us = 10.12,
> + .sr_enter_plus_exit_time_us = 11.48,
> + .valid = true,
> + },
> + {
> + .wm_inst = WM_D,
> + .wm_type = WM_TYPE_PSTATE_CHG,
> + .pstate_latency_us = 11.72,
> + .sr_exit_time_us = 10.12,
> + .sr_enter_plus_exit_time_us = 11.48,
> + .valid = true,
> + },
> + }
> +};
> +
> +struct wm_table lpddr5_wm_table = {
> + .entries = {
> + {
> + .wm_inst = WM_A,
> + .wm_type = WM_TYPE_PSTATE_CHG,
> + .pstate_latency_us = 11.65333,
> + .sr_exit_time_us = 13.5,
> + .sr_enter_plus_exit_time_us = 16.5,
> + .valid = true,
> + },
> + {
> + .wm_inst = WM_B,
> + .wm_type = WM_TYPE_PSTATE_CHG,
> + .pstate_latency_us = 11.65333,
> + .sr_exit_time_us = 13.5,
> + .sr_enter_plus_exit_time_us = 16.5,
> + .valid = true,
> + },
> + {
> + .wm_inst = WM_C,
> + .wm_type = WM_TYPE_PSTATE_CHG,
> + .pstate_latency_us = 11.65333,
> + .sr_exit_time_us = 13.5,
> + .sr_enter_plus_exit_time_us = 16.5,
> + .valid = true,
> + },
> + {
> + .wm_inst = WM_D,
> + .wm_type = WM_TYPE_PSTATE_CHG,
> + .pstate_latency_us = 11.65333,
> + .sr_exit_time_us = 13.5,
> + .sr_enter_plus_exit_time_us = 16.5,
> + .valid = true,
> + },
> + }
> +};
> +
> static void calculate_wm_set_for_vlevel(int vlevel,
> struct wm_range_table_entry *table_entry,
> struct dcn_watermarks *wm_set,
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