On Thu, Sep 22, 2016 at 01:28:37PM +0200, Daniel Vetter wrote:
On Thu, Sep 22, 2016 at 1:22 PM, Sean Paul <seanp...@chromium.org> wrote:
On Thu, Sep 22, 2016 at 3:51 AM, Russell King - ARM Linux
<li...@armlinux.org.uk> wrote:
On Thu, Sep 22, 2016 at 11:39:18AM +0100, Brian Starkey wrote:
Actually, could you please hold off picking this up? We need to make
changes in mali-dp and hdlcd or this will mess up their registration.
I will send those patches later today, but better if this all goes in
together (whenever that ends up being).

Sorry, but I'm annoyed with this - the impression being given was that
I was holding up this patch by not testing it on Armada, and I brought
up the issue about registration at the beginning of this.

Sorry, this was poor on my part. There's no-one who will care about
Mali-DP, but I had forgotten that this would also break HDLCD.

Now we're _just_ finding out that there are drivers where removing the
connector registration in tda998x causes them to break?  It's a bit
late to be checking your own drivers when you've been chasing me...

It's not like I didn't check our drivers, more that I should have sent
a full series for all three drivers together in the first place.

However, without patching all three drivers in the same commit, there
would always be some breakage. HDLCD and Mali-DP call
drm_dev_register() before binding the components - this was needed to
work with tda998x, which needed the device to be already registered
before its bind callback runs.

It's more proper to call drm_dev_register() as the very last thing
(i.e. after component_bind_all()) to avoid races with userspace - but
I couldn't do that without this change in tda998x first.

Sorry, but it sounds like we're not ready to make this change - and as
it's the very last day that changes will appear in linux-next prior to
the merge window (assuming Linus releases 4.8 on Sunday), I'd suggest
holding off until after the merge window is over, so we can get some
testing with these other two drivers with this change in place.

sigh. I just pushed my queue to drm-misc, which included this patch.
Sounds like I should revert?

I thought I looked at the entire situation and since we register
(since recently) all connectors in drm_dev_register() there shouldn't
be an issue for any other driver. Imo no need to revert anything here
- until someone complains with a bug report and proves me wrong ;-)

Yeah... this does indeed break HDLCD and Mali-DP. They register the
device, then bind tda998x which init's its connector. The connector
ends up in the connector_list, but not the idr.

I don't know how widely HDLCD on Juno is used (for anyone to notice).


Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

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