From: Alex Hung <alex.hung@amd.com>
To: Mario Limonciello <mario.limonciello@amd.com>,
amd-gfx@lists.freedesktop.org
Cc: Harry Wentland <harry.wentland@amd.com>,
Leo Li <sunpeng.li@amd.com>,
Aurabindo Pillai <aurabindo.pillai@amd.com>,
Roman Li <roman.li@amd.com>, Wayne Lin <wayne.lin@amd.com>,
Tom Chung <chiahsuan.chung@amd.com>,
Fangzhi Zuo <jerry.zuo@amd.com>,
Dan Wheeler <daniel.wheeler@amd.com>, Ray Wu <Ray.Wu@amd.com>,
Ivan Lipski <ivan.lipski@amd.com>,
Relja Vojvodic <rvojvodi@amd.com>,
Alex Deucher <alexander.deucher@amd.com>,
stable@vger.kernel.org, Chris Park <chris.park@amd.com>,
Wenjing Liu <wenjing.liu@amd.com>
Subject: Re: [PATCH 23/26] drm/amd/display: Correct DSC padding accounting
Date: Thu, 20 Nov 2025 11:35:40 -0700 [thread overview]
Message-ID: <1a10e80d-23a6-4b35-bced-7b55cc6a5966@amd.com> (raw)
In-Reply-To: <49c24aad-90cb-4d87-afe2-1a65d2d85e80@amd.com>
On 11/20/25 11:33, Mario Limonciello wrote:
>
>
> On 11/20/2025 12:03 PM, Alex Hung wrote:
>> From: Relja Vojvodic <rvojvodi@amd.com>
>>
>> [WHY]
>> - After the addition of all OVT patches, DSC padding was being accounted
>> for multiple times, effectively doubling the padding
>
> Can you double check when the OVT patches were submitted and if they
> were CC @stable? If not; I think the stable tag should be dropped on
> this patch.
Thanks. I will remove the Cc stable.
>
>> - This caused compliance failures or corruption
>>
>> [HOW]
>> - Add padding to DSC pic width when required by HW, and do not re-add
>> when calculating reg values
>> - Do not add padding when computing PPS values, and instead track padding
>> separately to add when calculating slice width values
>>
>> Cc: Mario Limonciello <mario.limonciello@amd.com>
>> Cc: Alex Deucher <alexander.deucher@amd.com>
>> Cc: stable@vger.kernel.org
>> Reviewed-by: Chris Park <chris.park@amd.com>
>> Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
>> Signed-off-by: Relja Vojvodic <rvojvodi@amd.com>
>> Signed-off-by: Alex Hung <alex.hung@amd.com>
>> ---
>> drivers/gpu/drm/amd/display/dc/hwss/dcn314/dcn314_hwseq.c | 2 +-
>> drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c | 2 +-
>> drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c | 2 +-
>> drivers/gpu/drm/amd/display/dc/link/link_dpms.c | 3 ++-
>> .../gpu/drm/amd/display/dc/resource/dcn20/dcn20_resource.c | 6 +++---
>> 5 files changed, 8 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn314/dcn314_hwseq.c
>> b/drivers/gpu/drm/amd/display/dc/hwss/dcn314/dcn314_hwseq.c
>> index 4ee6ed610de0..3e239124c17d 100644
>> --- a/drivers/gpu/drm/amd/display/dc/hwss/dcn314/dcn314_hwseq.c
>> +++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn314/dcn314_hwseq.c
>> @@ -108,7 +108,7 @@ static void update_dsc_on_stream(struct pipe_ctx
>> *pipe_ctx, bool enable)
>> dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
>> ASSERT(dsc_cfg.dc_dsc_cfg.num_slices_h % opp_cnt == 0);
>> dsc_cfg.dc_dsc_cfg.num_slices_h /= opp_cnt;
>> - dsc_cfg.dsc_padding = pipe_ctx-
>> >dsc_padding_params.dsc_hactive_padding;
>> + dsc_cfg.dsc_padding = 0;
>> dsc->funcs->dsc_set_config(dsc, &dsc_cfg, &dsc_optc_cfg);
>> dsc->funcs->dsc_enable(dsc, pipe_ctx->stream_res.opp->inst);
>> diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
>> b/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
>> index bf19ba65d09a..b213a2ac827a 100644
>> --- a/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
>> +++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
>> @@ -1061,7 +1061,7 @@ void dcn32_update_dsc_on_stream(struct pipe_ctx
>> *pipe_ctx, bool enable)
>> dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
>> ASSERT(dsc_cfg.dc_dsc_cfg.num_slices_h % opp_cnt == 0);
>> dsc_cfg.dc_dsc_cfg.num_slices_h /= opp_cnt;
>> - dsc_cfg.dsc_padding = pipe_ctx-
>> >dsc_padding_params.dsc_hactive_padding;
>> + dsc_cfg.dsc_padding = 0;
>> if (should_use_dto_dscclk)
>> dccg->funcs->set_dto_dscclk(dccg, dsc->inst,
>> dsc_cfg.dc_dsc_cfg.num_slices_h);
>> diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c
>> b/drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c
>> index 7aa0f452e8f7..cb2dfd34b5e2 100644
>> --- a/drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c
>> +++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c
>> @@ -364,7 +364,7 @@ static void update_dsc_on_stream(struct pipe_ctx
>> *pipe_ctx, bool enable)
>> dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
>> ASSERT(dsc_cfg.dc_dsc_cfg.num_slices_h % opp_cnt == 0);
>> dsc_cfg.dc_dsc_cfg.num_slices_h /= opp_cnt;
>> - dsc_cfg.dsc_padding = pipe_ctx-
>> >dsc_padding_params.dsc_hactive_padding;
>> + dsc_cfg.dsc_padding = 0;
>> dsc->funcs->dsc_set_config(dsc, &dsc_cfg, &dsc_optc_cfg);
>> dsc->funcs->dsc_enable(dsc, pipe_ctx->stream_res.opp->inst);
>> diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c b/
>> drivers/gpu/drm/amd/display/dc/link/link_dpms.c
>> index 1b1ce3839922..77e049917c4d 100644
>> --- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
>> +++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c
>> @@ -841,7 +841,7 @@ void link_set_dsc_on_stream(struct pipe_ctx
>> *pipe_ctx, bool enable)
>> dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
>> ASSERT(dsc_cfg.dc_dsc_cfg.num_slices_h % opp_cnt == 0);
>> dsc_cfg.dc_dsc_cfg.num_slices_h /= opp_cnt;
>> - dsc_cfg.dsc_padding = pipe_ctx-
>> >dsc_padding_params.dsc_hactive_padding;
>> + dsc_cfg.dsc_padding = 0;
>> if (should_use_dto_dscclk)
>> dccg->funcs->set_dto_dscclk(dccg, dsc->inst,
>> dsc_cfg.dc_dsc_cfg.num_slices_h);
>> @@ -857,6 +857,7 @@ void link_set_dsc_on_stream(struct pipe_ctx
>> *pipe_ctx, bool enable)
>> }
>> dsc_cfg.dc_dsc_cfg.num_slices_h *= opp_cnt;
>> dsc_cfg.pic_width *= opp_cnt;
>> + dsc_cfg.dsc_padding = pipe_ctx-
>> >dsc_padding_params.dsc_hactive_padding;
>> optc_dsc_mode = dsc_optc_cfg.is_pixel_format_444 ?
>> OPTC_DSC_ENABLED_444 : OPTC_DSC_ENABLED_NATIVE_SUBSAMPLED;
>> diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn20/
>> dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn20/
>> dcn20_resource.c
>> index 6679c1a14f2f..8d10aac9c510 100644
>> --- a/drivers/gpu/drm/amd/display/dc/resource/dcn20/dcn20_resource.c
>> +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn20/dcn20_resource.c
>> @@ -1660,8 +1660,8 @@ bool dcn20_validate_dsc(struct dc *dc, struct
>> dc_state *new_ctx)
>> if (pipe_ctx->top_pipe || pipe_ctx->prev_odm_pipe || !stream
>> || !stream->timing.flags.DSC)
>> continue;
>> - dsc_cfg.pic_width = (stream->timing.h_addressable + stream-
>> >timing.h_border_left
>> - + stream->timing.h_border_right) / opp_cnt;
>> + dsc_cfg.pic_width = (stream->timing.h_addressable + pipe_ctx-
>> >dsc_padding_params.dsc_hactive_padding
>> + + stream->timing.h_border_left + stream-
>> >timing.h_border_right) / opp_cnt;
>> dsc_cfg.pic_height = stream->timing.v_addressable + stream-
>> >timing.v_border_top
>> + stream->timing.v_border_bottom;
>> dsc_cfg.pixel_encoding = stream->timing.pixel_encoding;
>> @@ -1669,7 +1669,7 @@ bool dcn20_validate_dsc(struct dc *dc, struct
>> dc_state *new_ctx)
>> dsc_cfg.is_odm = pipe_ctx->next_odm_pipe ? true : false;
>> dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
>> dsc_cfg.dc_dsc_cfg.num_slices_h /= opp_cnt;
>> - dsc_cfg.dsc_padding = pipe_ctx-
>> >dsc_padding_params.dsc_hactive_padding;
>> + dsc_cfg.dsc_padding = 0;
>> if (!pipe_ctx->stream_res.dsc->funcs-
>> >dsc_validate_stream(pipe_ctx->stream_res.dsc, &dsc_cfg))
>> return false;
>
prev parent reply other threads:[~2025-11-20 18:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20251120181527.317107-1-alex.hung@amd.com>
2025-11-20 18:02 ` [PATCH 01/26] drm/amd/display: Check NULL before accessing Alex Hung
2025-11-20 18:03 ` [PATCH 10/26] drm/amd/display: Don't change brightness for disabled connectors Alex Hung
2025-11-20 18:03 ` [PATCH 15/26] drm/amd/display: Increase EDID read retries Alex Hung
2025-11-20 18:03 ` [PATCH 19/26] drm/amd/display: Add cursor offload abort to the new HWSS path Alex Hung
2025-11-20 18:03 ` [PATCH 23/26] drm/amd/display: Correct DSC padding accounting Alex Hung
2025-11-20 18:33 ` Mario Limonciello
2025-11-20 18:35 ` Alex Hung [this message]
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