linux-kernel - Re: [PATCH AUTOSEL 5.15 090/153] drm/amd/display: fix dcn4x init failed

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Message-ID: <CADnq5_NhYbp2SMivbG2pvB8oZNie5LBxS_ME5nMofX-2syQHrw@mail.gmail.com>
Date: Tue, 6 May 2025 11:00:58 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Sasha Levin <sashal@...nel.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	Charlene Liu <Charlene.Liu@....com>, Alvin Lee <alvin.lee2@....com>, 
	Zaeem Mohamed <zaeem.mohamed@....com>, Daniel Wheeler <daniel.wheeler@....com>, 
	Alex Deucher <alexander.deucher@....com>, harry.wentland@....com, sunpeng.li@....com, 
	christian.koenig@....com, airlied@...il.com, simona@...ll.ch, 
	hamzamahfooz@...ux.microsoft.com, Daniel.Sa@....com, alex.hung@....com, 
	rostrows@....com, Wayne.Lin@....com, Syed.Hassan@....com, 
	amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH AUTOSEL 5.15 090/153] drm/amd/display: fix dcn4x init failed

On Mon, May 5, 2025 at 7:16 PM Sasha Levin <sashal@...nel.org> wrote:
>
> From: Charlene Liu <Charlene.Liu@....com>
>
> [ Upstream commit 23ef388a84c72b0614a6c10f866ffeac7e807719 ]
>
> [why]
> failed due to cmdtable not created.
> switch atombios cmdtable as default.
>
> Reviewed-by: Alvin Lee <alvin.lee2@....com>
> Signed-off-by: Charlene Liu <Charlene.Liu@....com>
> Signed-off-by: Zaeem Mohamed <zaeem.mohamed@....com>
> Tested-by: Daniel Wheeler <daniel.wheeler@....com>
> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

Support for DCN 4 was added in 6.11 I think so there is no need to
backport DCN 4.x fixes to kernels older than 6.11.

Alex

> ---
>  drivers/gpu/drm/amd/display/dc/bios/command_table2.c     | 9 ---------
>  .../gpu/drm/amd/display/dc/bios/command_table_helper2.c  | 3 +--
>  2 files changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
> index f1f672a997d7d..d822cc948bdf2 100644
> --- a/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
> +++ b/drivers/gpu/drm/amd/display/dc/bios/command_table2.c
> @@ -103,7 +103,6 @@ static void init_dig_encoder_control(struct bios_parser *bp)
>                 bp->cmd_tbl.dig_encoder_control = encoder_control_digx_v1_5;
>                 break;
>         default:
> -               dm_output_to_console("Don't have dig_encoder_control for v%d\n", version);
>                 bp->cmd_tbl.dig_encoder_control = encoder_control_fallback;
>                 break;
>         }
> @@ -241,7 +240,6 @@ static void init_transmitter_control(struct bios_parser *bp)
>                 bp->cmd_tbl.transmitter_control = transmitter_control_v1_7;
>                 break;
>         default:
> -               dm_output_to_console("Don't have transmitter_control for v%d\n", crev);
>                 bp->cmd_tbl.transmitter_control = transmitter_control_fallback;
>                 break;
>         }
> @@ -409,8 +407,6 @@ static void init_set_pixel_clock(struct bios_parser *bp)
>                 bp->cmd_tbl.set_pixel_clock = set_pixel_clock_v7;
>                 break;
>         default:
> -               dm_output_to_console("Don't have set_pixel_clock for v%d\n",
> -                        BIOS_CMD_TABLE_PARA_REVISION(setpixelclock));
>                 bp->cmd_tbl.set_pixel_clock = set_pixel_clock_fallback;
>                 break;
>         }
> @@ -557,7 +553,6 @@ static void init_set_crtc_timing(struct bios_parser *bp)
>                         set_crtc_using_dtd_timing_v3;
>                 break;
>         default:
> -               dm_output_to_console("Don't have set_crtc_timing for v%d\n", dtd_version);
>                 bp->cmd_tbl.set_crtc_timing = NULL;
>                 break;
>         }
> @@ -674,8 +669,6 @@ static void init_enable_crtc(struct bios_parser *bp)
>                 bp->cmd_tbl.enable_crtc = enable_crtc_v1;
>                 break;
>         default:
> -               dm_output_to_console("Don't have enable_crtc for v%d\n",
> -                        BIOS_CMD_TABLE_PARA_REVISION(enablecrtc));
>                 bp->cmd_tbl.enable_crtc = NULL;
>                 break;
>         }
> @@ -869,8 +862,6 @@ static void init_set_dce_clock(struct bios_parser *bp)
>                 bp->cmd_tbl.set_dce_clock = set_dce_clock_v2_1;
>                 break;
>         default:
> -               dm_output_to_console("Don't have set_dce_clock for v%d\n",
> -                        BIOS_CMD_TABLE_PARA_REVISION(setdceclock));
>                 bp->cmd_tbl.set_dce_clock = NULL;
>                 break;
>         }
> diff --git a/drivers/gpu/drm/amd/display/dc/bios/command_table_helper2.c b/drivers/gpu/drm/amd/display/dc/bios/command_table_helper2.c
> index cb3fd44cb1edf..e0231660f69da 100644
> --- a/drivers/gpu/drm/amd/display/dc/bios/command_table_helper2.c
> +++ b/drivers/gpu/drm/amd/display/dc/bios/command_table_helper2.c
> @@ -79,8 +79,7 @@ bool dal_bios_parser_init_cmd_tbl_helper2(
>                 return true;
>  #endif
>         default:
> -               /* Unsupported DCE */
> -               BREAK_TO_DEBUGGER();
> +               *h = dal_cmd_tbl_helper_dce112_get_table2();
>                 return false;
>         }
>  }
> --
> 2.39.5
>