| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <88110320-6ff8-5287-0474-60afedd70996@amd.com>
Date: Thu, 5 Jan 2023 16:40:04 -0500
From: Harry Wentland <harry.wentland@....com>
To: Leo Li <sunpeng.li@....com>, Hamza Mahfooz <hamza.mahfooz@....com>,
amd-gfx@...ts.freedesktop.org
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
David Zhang <dingchen.zhang@....com>,
Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
Alex Hung <alex.hung@....com>,
Po Ting Chen <robin.chen@....com>,
Shirish S <shirish.s@....com>, Robin Chen <po-tchen@....com>,
Brian Chang <Brian.Chang@....com>,
Camille Cho <Camille.Cho@....com>,
Tom Chung <chiahsuan.chung@....com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/amd/display: fix PSR-SU/DSC interoperability
support
On 1/5/23 15:12, Leo Li wrote:
>
>
>
> On 1/5/23 15:07, Hamza Mahfooz wrote:
>> On 1/5/23 13:29, Harry Wentland wrote:
>>>
>>>
>>> On 1/5/23 12:38, Hamza Mahfooz wrote:
>>>> Currently, there are issues with enabling PSR-SU + DSC. This stems from
>>>> the fact that DSC imposes a slice height on transmitted video data and
>>>> we are not conforming to that slice height in PSR-SU regions. So, pass
>>>> slice_height into su_y_granularity to feed the DSC slice height into
>>>> PSR-SU code.
>>>>
>>>> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>
>>>> ---
>>>> v2: move code to modules/power.
>>>> ---
>>>> .../drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c | 3 ++
>>>> .../amd/display/modules/power/power_helpers.c | 35 +++++++++++++++++++
>>>> .../amd/display/modules/power/power_helpers.h | 3 ++
>>>> 3 files changed, 41 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c
>>>> index 26291db0a3cf..872d06fe1436 100644
>>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c
>>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c
>>>> @@ -122,6 +122,9 @@ bool amdgpu_dm_link_setup_psr(struct dc_stream_state *stream)
>>>> psr_config.allow_multi_disp_optimizations =
>>>> (amdgpu_dc_feature_mask & DC_PSR_ALLOW_MULTI_DISP_OPT);
>>>> + if (!psr_su_set_y_granularity(dc, link, stream, &psr_config))
>>>> + return false;
>>>> +
>>>> ret = dc_link_setup_psr(link, stream, &psr_config, &psr_context);
>>>> }
>>>> diff --git a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
>>>> index 9b5d9b2c9a6a..4d27ad9f7370 100644
>>>> --- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
>>>> +++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.c
>>>> @@ -916,3 +916,38 @@ bool mod_power_only_edp(const struct dc_state *context, const struct dc_stream_s
>>>> {
>>>> return context && context->stream_count == 1 && dc_is_embedded_signal(stream->signal);
>>>> }
>>>> +
>>>> +bool psr_su_set_y_granularity(struct dc *dc, struct dc_link *link,
>>>> + struct dc_stream_state *stream,
>>>> + struct psr_config *config)
>>>> +{
>>>> + uint16_t pic_height;
>>>> + uint8_t slice_height;
>>>> +
>>>> + if (!dc->caps.edp_dsc_support ||
>>>> + link->panel_config.dsc.disable_dsc_edp ||
>>>> + !link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT ||
>>>> + !stream->timing.dsc_cfg.num_slices_v)
>>>
>>> I'm not sure this condition is correct. We can have DSC but not eDP DSC
>>> support.
>>>
>>
>> AFAIK PSR-SU displays use eDP exclusively, so we shouldn't have to worry about this case.
>
> Right, the dc_link here should only be eDP. I suppose that isn't quite
> clear.
>
Right, I was thinking of DSC but PSR-SU is eDP only.
Harry
> Maybe add this as part of the condition?
>
> if (!(link->connector_signal & SIGNAL_TYPE_EDP))
> return true;
>
> Thanks,
> Leo
>
>>
>>>> + return true;
>>>> +
>>>> + pic_height = stream->timing.v_addressable +
>>>> + stream->timing.v_border_top + stream->timing.v_border_bottom;
>>>> + slice_height = pic_height / stream->timing.dsc_cfg.num_slices_v;
>>>> +
>>>> + if (slice_height) {
>>>> + if (config->su_y_granularity &&
>>>> + (slice_height % config->su_y_granularity)) {
>>>> + WARN(1,
>>>
>>> We don't use WARN in display/dc or display/modules. DC_LOG_WARNING
>>> might be better, or log it in the caller.
>>>
>>> Harry
>>>
>>>> + "%s: dsc: %d, slice_height: %d, num_slices_v: %d\n",
>>>> + __func__,
>>>> + stream->sink->dsc_caps.dsc_dec_caps.is_dsc_supported,
>>>> + slice_height,
>>>> + stream->timing.dsc_cfg.num_slices_v);
>>>> + return false;
>>>> + }
>>>> +
>>>> + config->su_y_granularity = slice_height;
>>>> + }
>>>> +
>>>> + return true;
>>>> +}
>>>> diff --git a/drivers/gpu/drm/amd/display/modules/power/power_helpers.h b/drivers/gpu/drm/amd/display/modules/power/power_helpers.h
>>>> index 316452e9dbc9..bb16b37b83da 100644
>>>> --- a/drivers/gpu/drm/amd/display/modules/power/power_helpers.h
>>>> +++ b/drivers/gpu/drm/amd/display/modules/power/power_helpers.h
>>>> @@ -59,4 +59,7 @@ void mod_power_calc_psr_configs(struct psr_config *psr_config,
>>>> const struct dc_stream_state *stream);
>>>> bool mod_power_only_edp(const struct dc_state *context,
>>>> const struct dc_stream_state *stream);
>>>> +bool psr_su_set_y_granularity(struct dc *dc, struct dc_link *link,
>>>> + struct dc_stream_state *stream,
>>>> + struct psr_config *config);
>>>> #endif /* MODULES_POWER_POWER_HELPERS_H_ */
>>>
>>
Powered by blists - more mailing lists