Re: [PATCH v2 24/27] drm/amdgpu/dm: Resume short HPD IRQs before resuming MST topology

[Alex Deucher]

On Tue, Sep 3, 2019 at 4:49 PM Lyude Paul <lyude@xxxxxxxxxx> wrote:
>
> Since we're going to be reprobing the entire topology state on resume
> now using sideband transactions, we need to ensure that we actually have
> short HPD irqs enabled before calling drm_dp_mst_topology_mgr_resume().
> So, do that.
>
> Cc: Juston Li <juston.li@xxxxxxxxx>
> Cc: Imre Deak <imre.deak@xxxxxxxxx>
> Cc: Ville SyrjÃlà <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Harry Wentland <hwentlan@xxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>

Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 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 73630e2940d4..4d3c8bff77da 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1185,15 +1185,15 @@ static int dm_resume(void *handle)
>         /* program HPD filter */
>         dc_resume(dm->dc);
>
> -       /* On resume we need to  rewrite the MSTM control bits to enamble MST*/
> -       s3_handle_mst(ddev, false);
> -
>         /*
>          * early enable HPD Rx IRQ, should be done before set mode as short
>          * pulse interrupts are used for MST
>          */
>         amdgpu_dm_irq_resume_early(adev);
>
> +       /* On resume we need to  rewrite the MSTM control bits to enamble MST*/
> +       s3_handle_mst(ddev, false);
> +
>         /* Do detection*/
>         drm_connector_list_iter_begin(ddev, &iter);
>         drm_for_each_connector_iter(connector, &iter) {
> --
> 2.21.0
>
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