Re: [PATCH v3] usb: typec: altmodes: select DRM_AUX_HPD_BRIDGE for TYPEC_DP_ALTMODE

[Chaoyi Chen]

Hi Heikki,

On 7/13/2026 5:35 PM, Heikki Krogerus wrote:
> On Thu, Jul 09, 2026 at 02:21:47PM +0800, Chaoyi Chen wrote:
>> From: Chaoyi Chen <chaoyi.chen@xxxxxxxxxxxxxx>
>>
>> When TYPEC_DP_ALTMODE is enabled, DRM_AUX_HPD_BRIDGE is most likely
>> also needed for embedded platforms. Select it when available.
>>
>> Suggested-by: Xu Yang <xu.yang_2@xxxxxxxxxxx>
>> Signed-off-by: Chaoyi Chen <chaoyi.chen@xxxxxxxxxxxxxx>
>> ---
>> Changes in v3:
>> - Link to v2: https://lore.kernel.org/all/20260705065832.184-1-kernel@xxxxxxxxxx/
>> - Use the same "select" as v1 to make things simple. 
>>
>> Changes in v2:
>> - Link to v1: https://lore.kernel.org/all/20260702022036.44-1-kernel@xxxxxxxxxx/
>> - Change "select" to "imply".
>> ---
>>
>>  drivers/usb/typec/altmodes/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/usb/typec/altmodes/Kconfig b/drivers/usb/typec/altmodes/Kconfig
>> index 7867fa7c405d..b054c0b6a8d4 100644
>> --- a/drivers/usb/typec/altmodes/Kconfig
>> +++ b/drivers/usb/typec/altmodes/Kconfig
>> @@ -5,6 +5,7 @@ menu "USB Type-C Alternate Mode drivers"
>>  config TYPEC_DP_ALTMODE
>>  	tristate "DisplayPort Alternate Mode driver"
>>  	depends on DRM
>> +	select DRM_AUX_HPD_BRIDGE if DRM_BRIDGE && OF
> 
> Is there really no way of making this into a dependency?
> Doesn't this, or something like it not work:
> 
>         depends on (DRM_AUX_HPD_BRIDGE && DRM_BRIDGE && OF) || !DRM_AUX_HPD_BRIDGE
>

I think Xu originally wanted to select this item directly, since it
wasn't visible in the menu and there was nowhere to select it on some platforms.

> Thanks,
> 
>>  	help
>>  	  DisplayPort USB Type-C Alternate Mode allows DisplayPort
>>  	  displays and adapters to be attached to the USB Type-C
>> -- 
>> 2.54.0
> 

-- 
Best, 
Chaoyi