linux-kernel - Re: [PATCH v6 1/3] drm/tidss: oldi: Add property to identify OLDI supported VP

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Message-ID: <a0df1c72-2571-4791-ac66-07f9b3431ff6@ti.com>
Date: Wed, 17 Sep 2025 19:02:58 +0530
From: Swamil Jain <s-jain1@...com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
CC: <h-shenoy@...com>, <devarsht@...com>, <vigneshr@...com>, <praneeth@...com>,
        <u-kumar1@...com>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <jyri.sarha@....fi>,
        <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <airlied@...il.com>, <simona@...ll.ch>,
        <aradhya.bhatia@...ux.dev>
Subject: Re: [PATCH v6 1/3] drm/tidss: oldi: Add property to identify OLDI
 supported VP

Hi Tomi,

On 9/16/25 17:10, Tomi Valkeinen wrote:
> Hi,
> 
> On 11/09/2025 14:07, Swamil Jain wrote:
>> From: Jayesh Choudhary <j-choudhary@...com>
>>
>> TIDSS should know which VP has OLDI output to avoid calling clock
>> functions for that VP as those are controlled by oldi driver. Add a
>> property "is_ext_vp_clk" to "tidss_device" structure for that. Mark it
>> 'true' in tidss_oldi_init() and 'false' in tidss_oldi_deinit().
>>
>> Fixes: 7246e0929945 ("drm/tidss: Add OLDI bridge support")
> 
> What bug does this fix? It's just adding a new field which it sets to
> true/false...

Please take a look: 
https://lore.kernel.org/all/a0489fea-8c06-4c89-a530-8be691f4705d@ti.com/

Should we remove the tag?
Or, else, please suggest a better way to describe the issue mentioned in 
above link.

Regards,
Swamil
> 
>   Tomi
> 
>> Tested-by: Michael Walle <mwalle@...nel.org>
>> Reviewed-by: Devarsh Thakkar <devarsht@...com>
>> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
>> Signed-off-by: Swamil Jain <s-jain1@...com>
>> ---
>>   drivers/gpu/drm/tidss/tidss_drv.h  | 2 ++
>>   drivers/gpu/drm/tidss/tidss_oldi.c | 2 ++
>>   2 files changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/tidss/tidss_drv.h b/drivers/gpu/drm/tidss/tidss_drv.h
>> index 84454a4855d1..e1c1f41d8b4b 100644
>> --- a/drivers/gpu/drm/tidss/tidss_drv.h
>> +++ b/drivers/gpu/drm/tidss/tidss_drv.h
>> @@ -24,6 +24,8 @@ struct tidss_device {
>>   
>>   	const struct dispc_features *feat;
>>   	struct dispc_device *dispc;
>> +	bool is_ext_vp_clk[TIDSS_MAX_PORTS];
>> +
>>   
>>   	unsigned int num_crtcs;
>>   	struct drm_crtc *crtcs[TIDSS_MAX_PORTS];
>> diff --git a/drivers/gpu/drm/tidss/tidss_oldi.c b/drivers/gpu/drm/tidss/tidss_oldi.c
>> index 7688251beba2..7ecbb2c3d0a2 100644
>> --- a/drivers/gpu/drm/tidss/tidss_oldi.c
>> +++ b/drivers/gpu/drm/tidss/tidss_oldi.c
>> @@ -430,6 +430,7 @@ void tidss_oldi_deinit(struct tidss_device *tidss)
>>   	for (int i = 0; i < tidss->num_oldis; i++) {
>>   		if (tidss->oldis[i]) {
>>   			drm_bridge_remove(&tidss->oldis[i]->bridge);
>> +			tidss->is_ext_vp_clk[tidss->oldis[i]->parent_vp] = false;
>>   			tidss->oldis[i] = NULL;
>>   		}
>>   	}
>> @@ -580,6 +581,7 @@ int tidss_oldi_init(struct tidss_device *tidss)
>>   		oldi->bridge.timings = &default_tidss_oldi_timings;
>>   
>>   		tidss->oldis[tidss->num_oldis++] = oldi;
>> +		tidss->is_ext_vp_clk[oldi->parent_vp] = true;
>>   		oldi->tidss = tidss;
>>   
>>   		drm_bridge_add(&oldi->bridge);
>