linux-kernel - Re: [PATCH] drm/rockchip: vop2: Use OVL_LAYER_SEL configuration instead of use win_mask calculate used layers

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Message-Id: <DE7IXK6SWV7J.3B9AOCCGWT4EH@cknow-tech.com>
Date: Thu, 13 Nov 2025 12:18:17 +0100
From: "Diederik de Haas" <diederik@...ow-tech.com>
To: "Dang Huynh" <dang.huynh@...nlining.org>, "Andy Yan" <andyshrk@....com>
Cc: <heiko@...ech.de>, <hjc@...k-chips.com>, <diederik@...ow-tech.com>,
 <dri-devel@...ts.freedesktop.org>, <linux-arm-kernel@...ts.infradead.org>,
 <linux-kernel@...r.kernel.org>, <linux-rockchip@...ts.infradead.org>, "Andy
 Yan" <andy.yan@...k-chips.com>
Subject: Re: [PATCH] drm/rockchip: vop2: Use OVL_LAYER_SEL configuration
 instead of use win_mask calculate used layers

On Thu Nov 13, 2025 at 9:11 AM CET, Dang Huynh wrote:
> Hi Andy,
>
> This fix works on my device. No more black box around the cursor.
>
> Tested-by: Dang Huynh <dang.huynh@...nlining.org>

Thanks for testing and your Tested-by tag :-D

FYI: Apparently something went wrong with delivery it as it only arrived
at LKML, but not dri-devel, linux-arm-kernel or linux-rockchip MLs.
No idea if that's problematic (for b4 f.e.) though.

'lore' has it here:
https://lore.kernel.org/all/hrg6geclph37olvqr3o5v4d4mifvl25kaemh7f2z3hwega7h2b@muf2gkfqzvvz/

Cheers,
 Diederik

> On Wed, Nov 12, 2025 at 04:50:23PM +0800, Andy Yan wrote:
>> From: Andy Yan <andy.yan@...k-chips.com>
>> 
>> When there are multiple Video Ports, and only one of them is working
>> (for example, VP1 is working while VP0 is not), in this case, the
>> win_mask of VP0 is 0. However, we have already set the port mux for VP0
>> according to vp0->nlayers, and at the same time, in the OVL_LAYER_SEL
>> register, there are windows will also be assigned to layers which will
>> map to the inactive VPs. In this situation, vp0->win_mask is zero as it
>> now working, it is more reliable to calculate the used layers based on
>> the configuration of the OVL_LAYER_SEL register.
>> 
>> Note: as the configuration of OVL_LAYER_SEL is take effect when the
>> vsync is come, so we use the value backup in vop2->old_layer_sel instead
>> of read OVL_LAYER_SEL directly.
>> 
>> Fixes: 3e89a8c68354 ("drm/rockchip: vop2: Fix the update of LAYER/PORT select registers when there are multi display output on rk3588/rk3568")
>> Reported-by: Diederik de Haas <diederik@...ow-tech.com>
>> Closes: https://bugs.kde.org/show_bug.cgi?id=511274
>> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
>> ---
>> 
>>  drivers/gpu/drm/rockchip/rockchip_vop2_reg.c | 49 +++++++++++++++++---
>>  1 file changed, 42 insertions(+), 7 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
>> index d22ce11a4235..f3950e8476a7 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_vop2_reg.c
>> @@ -1369,6 +1369,25 @@ static const struct vop2_regs_dump rk3588_regs_dump[] = {
>>  	},
>>  };
>>  
>> +/*
>> + * phys_id is used to identify a main window(Cluster Win/Smart Win, not
>> + * include the sub win of a cluster or the multi area) that can do overlay
>> + * in main overlay stage.
>> + */
>> +static struct vop2_win *vop2_find_win_by_phys_id(struct vop2 *vop2, uint8_t phys_id)
>> +{
>> +	struct vop2_win *win;
>> +	int i;
>> +
>> +	for (i = 0; i < vop2->data->win_size; i++) {
>> +		win = &vop2->win[i];
>> +		if (win->data->phys_id == phys_id)
>> +			return win;
>> +	}
>> +
>> +	return NULL;
>> +}
>> +
>>  static unsigned long rk3568_set_intf_mux(struct vop2_video_port *vp, int id, u32 polflags)
>>  {
>>  	struct vop2 *vop2 = vp->vop2;
>> @@ -1842,15 +1861,31 @@ static void vop2_parse_alpha(struct vop2_alpha_config *alpha_config,
>>  	alpha->dst_alpha_ctrl.bits.factor_mode = ALPHA_SRC_INVERSE;
>>  }
>>  
>> -static int vop2_find_start_mixer_id_for_vp(struct vop2 *vop2, u8 port_id)
>> +static int vop2_find_start_mixer_id_for_vp(struct vop2_video_port *vp)
>>  {
>> -	struct vop2_video_port *vp;
>> -	int used_layer = 0;
>> +	struct vop2 *vop2 = vp->vop2;
>> +	struct vop2_win *win;
>> +	u32 layer_sel = vop2->old_layer_sel;
>> +	u32 used_layer = 0;
>> +	unsigned long win_mask = vp->win_mask;
>> +	unsigned long phys_id;
>> +	bool match;
>>  	int i;
>>  
>> -	for (i = 0; i < port_id; i++) {
>> -		vp = &vop2->vps[i];
>> -		used_layer += hweight32(vp->win_mask);
>> +	for (i = 0; i < 31; i += 4) {
>> +		match = false;
>> +		for_each_set_bit(phys_id, &win_mask, ROCKCHIP_VOP2_ESMART3) {
>> +			win = vop2_find_win_by_phys_id(vop2, phys_id);
>> +			if (win->data->layer_sel_id[vp->id] == ((layer_sel >> i) & 0xf)) {
>> +				match = true;
>> +				break;
>> +			}
>> +		}
>> +
>> +		if (!match)
>> +			used_layer += 1;
>> +		else
>> +			break;
>>  	}
>>  
>>  	return used_layer;
>> @@ -1935,7 +1970,7 @@ static void vop2_setup_alpha(struct vop2_video_port *vp)
>>  	u32 dst_global_alpha = DRM_BLEND_ALPHA_OPAQUE;
>>  
>>  	if (vop2->version <= VOP_VERSION_RK3588)
>> -		mixer_id = vop2_find_start_mixer_id_for_vp(vop2, vp->id);
>> +		mixer_id = vop2_find_start_mixer_id_for_vp(vp);
>>  	else
>>  		mixer_id = 0;
>>  
>> -- 
>> 2.43.0
>> 
>> base-commit: ded94ec6167e84195507237100f6278941e36fdd
>> branch: drm-misc-next-2025-1016
>> 
>> 
>> _______________________________________________
>> Linux-rockchip mailing list
>> Linux-rockchip@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-rockchip

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