On 30/06/17 11:58, Aaro Koskinen wrote:
Hi,
On Fri, Jun 30, 2017 at 09:41:35AM +0300, Tomi Valkeinen wrote:
On 29/06/17 21:50, Aaro Koskinen wrote:
On Thu, Jun 15, 2017 at 09:51:06AM +0300, Tomi Valkeinen wrote:
On 15/06/17 01:11, Aaro Koskinen wrote:
When booting v4.12-rc5 on Nokia N900, omapdrm fails to probe and there is no display.
Are you sure it doesn't probe? It fails the omapdss_stack_is_ready() check?
It appears the reason was that I didn't have CONFIG_DRM_OMAP_CONNECTOR_ANALOG_TV enabled.
I think that's wrong. I don't own an analog TV, so why should I enable such option to get device's built-in display working?
Indeed. Unfortunately I don't have a solution for that.
DRM doesn't support adding devices after probe. So at omapdrm probe time we have to decide which displays to use. In the dts file, n900 defines the lcd and analog tv. omapdrm sees those, and, of course, must wait until their respective drivers have probed. If you don't have the display driver enabled, it's never loaded and omapdrm never probes as it keeps waiting for those.
Could you at least print some kind of message early in the boot ("omapdrm is waiting for drivers for display x and y")?
That could be quite spammy. omapdrm will defer probe if the displays are not present, and the deferred probing machinery will then cause a new omapdrm probe later. That can happen a lot of times before the drivers are there.
Tomi