[PATCH] drm/amd/display: Allow idle optimization based on vblank.

[Lakha, Bhawanpreet]

[AMD Official Use Only - Internal Distribution Only]

Hi Bindu,

dc_allow_idle_optimizations() should be called within mutex_lock(&dm->dc_lock). Please call it right after WARN_ON(!dc_commit_state(dm->dc, dc_state)) but before unlock().

Bhawan
________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Michel Dänzer <michel at daenzer.net>
Sent: March 17, 2021 7:37 AM
To: R, Bindu <Bindu.R at amd.com>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Feng, Kenneth <Kenneth.Feng at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>; Lakha, Bhawanpreet <Bhawanpreet.Lakha at amd.com>
Subject: Re: [PATCH] drm/amd/display: Allow idle optimization based on vblank.

On 2021-03-17 12:49 a.m., Bindu Ramamurthy wrote:
> [Why]
> idle optimization was being disabled after commit.
>
> [How]
> check vblank count for display off and enable idle optimization based on this count.
>
> Signed-off-by: Bindu Ramamurthy <bindu.r at amd.com>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 553e39f9538c..56a55143ad2d 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -987,7 +987,7 @@ static void event_mall_stutter(struct work_struct *work)
>
>        if (vblank_work->enable)
>                dm->active_vblank_irq_count++;
> -     else
> +     else if(dm->active_vblank_irq_count)
>                dm->active_vblank_irq_count--;

The commit log should explain why this part is needed.


--
Earthling Michel Dänzer               |               https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fredhat.com%2F&data=04%7C01%7Cbhawanpreet.lakha%40amd.com%7C11fd0779679742148e2a08d8e938fe34%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637515778296313590%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=%2BPsyjDxRCTdR9HL1QSlCraWo7YpFg%2FJT8i%2BSsG%2BQvZE%3D&reserved=0
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