linux-kernel - Re: [PATCH v2 14/22] drm/msm/dpu: Require modeset if clone mode status changes

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Message-ID: <75297d0d-528a-4152-b35f-ba41fbf914dc@quicinc.com>
Date: Tue, 24 Sep 2024 17:05:43 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Jessica Zhang
	<quic_jesszhan@...cinc.com>
CC: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        "Marijn
 Suijten" <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>, <quic_ebharadw@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Rob Clark
	<robdclark@...omium.org>,
        Ville Syrjälä
	<ville.syrjala@...ux.intel.com>
Subject: Re: [PATCH v2 14/22] drm/msm/dpu: Require modeset if clone mode
 status changes



On 9/24/2024 4:25 PM, Dmitry Baryshkov wrote:
> On Tue, Sep 24, 2024 at 03:59:30PM GMT, Jessica Zhang wrote:
>> If the clone mode enabled status is changing, a modeset needs to happen
>> so that the resources can be reassigned
> 
> Sima's comment regarding crtc_state->mode_changed seems to be ignored...
> 

Not ignored. One of us has to take that up. There is a broader cleanup 
required for that.

We can sync up on how to tackle this : whether it needs to be in this 
series or push another one cleaning up all the instances.

>>
>> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
>> ---
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
>> index a7850bf844db..f20e44e9fc05 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
>> @@ -1268,6 +1268,8 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
>>   {
>>   	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
>>   									  crtc);
>> +	struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
>> +									      crtc);
>>   	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
>>   	struct dpu_crtc_state *cstate = to_dpu_crtc_state(crtc_state);
>>   
>> @@ -1279,6 +1281,8 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
>>   	int rc = 0;
>>   
>>   	bool needs_dirtyfb = dpu_crtc_needs_dirtyfb(crtc_state);
>> +	bool clone_mode_requested = drm_crtc_in_clone_mode(old_crtc_state);
>> +	bool clone_mode_enabled = drm_crtc_in_clone_mode(crtc_state);
>>   
>>   	/* there might be cases where encoder needs a modeset too */
>>   	drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc_state->encoder_mask) {
>> @@ -1286,6 +1290,10 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
>>   			crtc_state->mode_changed = true;
>>   	}
>>   
>> +	if ((clone_mode_requested && !clone_mode_enabled) ||
>> +	    (!clone_mode_requested && clone_mode_enabled))
>> +		crtc_state->mode_changed = true;
>> +
>>   	if (drm_atomic_crtc_needs_modeset(crtc_state)) {
>>   		rc = dpu_crtc_assign_resources(crtc, crtc_state);
>>   		if (rc < 0)
>>
>> -- 
>> 2.34.1
>>
>