On 4/3/23 23:15, Francesco Dolcini wrote:
On Mon, Apr 03, 2023 at 04:06:22PM -0500, Rob Herring wrote:
On Thu, Mar 30, 2023 at 12:17:51PM +0200, Francesco Dolcini wrote:
From: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>
SN65DSI8[34] device supports burst video mode and non-burst video mode
with sync events or with sync pulses packet transmission as described in
the DSI specification.
Add property to select the expected mode, this allows for example to
select a mode that is compatible with the DSI host interface.
Why does this need to be in DT?
The source and sink drivers should know what their capabilities are
and pick the best common one.
Is there a best mode?
I think yes:
Burst (is better than) Sync Events (is better than) Sync Pulses
Burst is most energy efficient, Sync-Pulses is the simplest and least
energy efficient and with most constraints.
Isn't this a decision how do we want the 2 peers
to communicate?
I don't think so, I believe the Host and nearest bridge should be able
to negotiate their capabilities (mode, link rate, etc.) within the DRM
subsystem.
For the MIPI-DSI Linux/DRM experts: am I missing something? Is there
another way to have a DSI video sink to ask for a specific mode?
I'm afraid this is not implemented yet, so ... plumbing needed.
[...]
