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

Swamil Jain posted 3 patches 5 months ago
[PATCH v6 1/3] drm/tidss: oldi: Add property to identify OLDI supported VP
Posted by Swamil Jain 5 months ago 
From: Jayesh Choudhary <j-choudhary@ti.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")
Tested-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Devarsh Thakkar <devarsht@ti.com>
Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Signed-off-by: Swamil Jain <s-jain1@ti.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);
Re: [PATCH v6 1/3] drm/tidss: oldi: Add property to identify OLDI supported VP
Posted by Tomi Valkeinen 4 months, 3 weeks ago 
Hi,

On 11/09/2025 14:07, Swamil Jain wrote:
> From: Jayesh Choudhary <j-choudhary@ti.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...

 Tomi

> Tested-by: Michael Walle <mwalle@kernel.org>
> Reviewed-by: Devarsh Thakkar <devarsht@ti.com>
> Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
> Signed-off-by: Swamil Jain <s-jain1@ti.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);
Re: [PATCH v6 1/3] drm/tidss: oldi: Add property to identify OLDI supported VP
Posted by Swamil Jain 4 months, 3 weeks ago 
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@ti.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@kernel.org>
>> Reviewed-by: Devarsh Thakkar <devarsht@ti.com>
>> Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
>> Signed-off-by: Swamil Jain <s-jain1@ti.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);
>
Re: [PATCH v6 1/3] drm/tidss: oldi: Add property to identify OLDI supported VP
Posted by Tomi Valkeinen 4 months, 3 weeks ago 
Hi,

On 17/09/2025 16:32, Swamil Jain wrote:
> 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@ti.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/

There isn't a mention of any issue or fix in the intro letter nor the
patch descriptions, so a fixes tag looks very odd here.

Usually a Fixes tag is for a patch that does the fix. And, of course,
explains what the issue is and what the fix is.

If I understand this right, the fix is this from the patch 2:

+	if (dispc->tidss->is_ext_vp_clk[hw_videoport])
+		return 0;

And patch 3?

Those should be probably made into a single patch that fixes the issue.

Also, bridges have mode_valid callback. Would that be better in patch 3?

 Tomi

> 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@kernel.org>
>>> Reviewed-by: Devarsh Thakkar <devarsht@ti.com>
>>> Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
>>> Signed-off-by: Swamil Jain <s-jain1@ti.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);
>>
>

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