linux-kernel - Re: [PATCH] drm/amdgpu/dm/mst: Fix incorrect usage of drm_dp_add_payload

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Date:   Tue, 4 Oct 2022 16:46:44 -0400
From:   Rodrigo Siqueira Jordao <Rodrigo.Siqueira@....com>
To:     Lyude Paul <lyude@...hat.com>, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....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>,
        Fangzhi Zuo <Jerry.Zuo@....com>, Wayne Lin <Wayne.Lin@....com>,
        Ian Chen <ian.chen@....com>,
        Mikita Lipski <mikita.lipski@....com>,
        Hamza Mahfooz <hamza.mahfooz@....com>,
        Claudio Suarez <cssk@...-c.es>,
        Colin Ian King <colin.i.king@...il.com>,
        Jani Nikula <jani.nikula@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu/dm/mst: Fix incorrect usage of
 drm_dp_add_payload_part2()



On 2022-10-04 16:24, Lyude Paul wrote:
> Yikes, it appears somehow I totally made a mistake here. We're currently
> checking to see if drm_dp_add_payload_part2() returns a non-zero value to
> indicate success. That's totally wrong though, as this function only
> returns a zero value on success - not the other way around.
> 
> So, fix that.
> 
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> Issue: https://gitlab.freedesktop.org/drm/amd/-/issues/2171
> Fixes: 4d07b0bc4034 ("drm/display/dp_mst: Move all payload info into the atomic state")
> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> index b8077fcd4651..00598def5b39 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> @@ -297,7 +297,7 @@ bool dm_helpers_dp_mst_send_payload_allocation(
>   		clr_flag = MST_ALLOCATE_NEW_PAYLOAD;
>   	}
>   
> -	if (enable && drm_dp_add_payload_part2(mst_mgr, mst_state->base.state, payload)) {
> +	if (enable && drm_dp_add_payload_part2(mst_mgr, mst_state->base.state, payload) == 0) {
>   		amdgpu_dm_set_mst_status(&aconnector->mst_status,
>   			set_flag, false);
>   	} else {

Hi Lyude,

Maybe I'm missing something, but I can't find the 
drm_dp_add_payload_part2() function on amd-staging-drm-next. Which repo 
are you using?

Thanks
Siqueira