On 02/13/2015 06:55 PM, Thierry Reding wrote:
On Fri, Feb 13, 2015 at 03:29:09PM +0900, Alexandre Courbot wrote:
Hi Thierry,
I noticed that the DSI panel of SHIELD (tegra114-roth) was not brought up on
-next. I have bisected the following commit as introducing that behavior:
commit f4c5cf88fbd50e4779042268947b2e2f90c20484
Author: Thierry Reding <treding@xxxxxxxxxx>
Date: Thu Dec 18 15:29:14 2014 +0100
gpu: host1x: Provide a proper struct bus_type
With and without this patch, the DSI panel is probed, but the stack trace in
the probe() function is different:
This shouldn't make much of a difference, really, since we're attaching
to the panel only during mipi_dsi_host_register() anyway. And the panel
device can't exist earlier than that because mipi_dsi_host_register()
will instantiate it. Still...
i.e. with f4c5cf88fbd, the panel is not probed from tegra_dsi_probe()
anymore, which means DSI remains without a valid connector:
[ 1.378513] [drm] Initialized drm 1.1.0 20060810
[ 1.384564] 54300000.dsi supply avdd-dsi-csi not found, using dummy
regulator
[ 1.396394] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.403021] [drm] No driver support for vblank timestamp query.
[ 1.409080] drm drm: No connectors reported connected with modes
[ 1.415128] [drm] Cannot find any crtc or sizes - going 1024x768
... the failing log here does indicate that there is no panel, so I'll
need to investigate why that's happening.
Are you aware of this? Does it affect other DSI panels? Does SHIELD's DT
need an update of some sort?
I'm almost certain that I've tested this on at least Dalmore and I don't
see any differences that could be causing this. I'll look into it.
Thanks - please don't hesitate to ask me to run some more tests (or just
to try and fix it by myself) if this can save you time.
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