linux-kernel - Re: [PATCH] drm/amd/display: don't call dc_interrupt

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Date:   Wed, 8 Feb 2023 15:15:27 -0500
From:   Harry Wentland <harry.wentland@....com>
To:     Hamza Mahfooz <hamza.mahfooz@....com>,
        amd-gfx@...ts.freedesktop.org
Cc:     Leo Li <sunpeng.li@....com>,
        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>,
        Alan Liu <HaoPing.Liu@....com>, Alex Hung <alex.hung@....com>,
        Deepak R Varma <drv@...lo.com>,
        Melissa Wen <mwen@...lia.com>, Tony Cheng <Tony.Cheng@....com>,
        Mario Kleiner <mario.kleiner.de@...il.com>,
        Nicholas Kazlauskas <Nicholas.Kazlauskas@....com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: don't call dc_interrupt_set() for
 disabled crtcs

On 2/8/23 15:01, Hamza Mahfooz wrote:
> As made mention of in commit 4ea7fc09539b ("drm/amd/display: Do not
> program interrupt status on disabled crtc"), we shouldn't program
> disabled crtcs. So, filter out disabled crtcs in dm_set_vupdate_irq()
> and dm_set_vblank().
> 
> Fixes: 589d2739332d ("drm/amd/display: Use crtc enable/disable_vblank hooks")
> Fixes: d2574c33bb71 ("drm/amd/display: In VRR mode, do DRM core vblank handling at end of vblank. (v2)")
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>

Reviewed-by: Harry Wentland <harry.wentland@....com>

Harry

> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> index 1e39d0939700..dc4f37240beb 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> @@ -77,6 +77,9 @@ int dm_set_vupdate_irq(struct drm_crtc *crtc, bool enable)
>  	struct amdgpu_device *adev = drm_to_adev(crtc->dev);
>  	int rc;
>  
> +	if (acrtc->otg_inst == -1)
> +		return 0;
> +
>  	irq_source = IRQ_TYPE_VUPDATE + acrtc->otg_inst;
>  
>  	rc = dc_interrupt_set(adev->dm.dc, irq_source, enable) ? 0 : -EBUSY;
> @@ -151,6 +154,9 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)
>  	struct vblank_control_work *work;
>  	int rc = 0;
>  
> +	if (acrtc->otg_inst == -1)
> +		goto skip;
> +
>  	if (enable) {
>  		/* vblank irq on -> Only need vupdate irq in vrr mode */
>  		if (amdgpu_dm_vrr_active(acrtc_state))
> @@ -168,6 +174,7 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)
>  	if (!dc_interrupt_set(adev->dm.dc, irq_source, enable))
>  		return -EBUSY;
>  
> +skip:
>  	if (amdgpu_in_reset(adev))
>  		return 0;
>