On Thu, 3 Aug 2023 at 18:43, Simon Ser <contact@xxxxxxxxxxx> wrote: > > On Thursday, August 3rd, 2023 at 17:36, Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> wrote: > > > On Thu, 3 Aug 2023 at 18:31, Simon Ser contact@xxxxxxxxxxx wrote: > > > > > On Thursday, August 3rd, 2023 at 17:22, Simon Ser contact@xxxxxxxxxxx wrote: > > > > > > > The KMS docs describe "subconnector" to be defined as "downstream port" for DP. > > > > Can USB-C (or USB) be seen as a DP downstream port? > > > > > > To expand on this a bit: I'm wondering if we're mixing apples and > > > oranges here. The current values of "subconnector" typically describe > > > the lower-level protocol tunneled inside DP. For instance, VGA can be > > > tunneled inside the DP cable when using DP → VGA adapter. > > > > My opinion hasn't changed: I think this should be the USB connector > > with proper DP / DVI / HDMI / etc. subconnector type (or lack of it). > > In the end, the physical connector on the side of laptop is USB-C. > > - Even if the connector is USB-C, the protocol used for display is > still DP. There's also the case of Thunderbolt. Yes. But the connector type is not about the protocol. > - This is inconsistent with existing drivers. i915 and amdgpu expose > DP ports for their USB-C ports. Changing that isn't possible without > causing user-space regressions (compositor config files use the > connector type). Yes, I know. Consider my phrase as a personal opinion or minority report. I think that using DisplayPort for USB-C connectors was a mistake, which we now have to cope with somehow. -- With best wishes Dmitry
