[PATCH 1/2 v4] drm/pl111: Support the Versatile Express
From: liviu.dudau@arm.com (Liviu Dudau)
Date: 2018-05-01 08:41:39
Also in:
dri-devel
On Mon, Apr 30, 2018 at 03:55:41PM +0100, Robin Murphy wrote:
On 27/04/18 19:51, Linus Walleij wrote:quoted
On Fri, Apr 27, 2018 at 5:02 PM, Robin Murphy [off-list ref] wrote:quoted
I dug a little bit and it seems pl111_modeset_init() is deferring because it can't find endpoint 0. And given that that's apparently pointing at some non-existent panel rather than the DVI encoder as I would (naively) expect, I can at least form a self-consistent explanation and give up on the grounds that I'm probably missing some important DT changes.Yeah it does help if I also send the required DT changes :/ Sorry for my absentmindedness, I'll shoot it off right now so you can test it.Hooray, thanks for that. For these 2 patches with a V2P-CA15_A7 tile and the DT fixed up, Tested-by: Robin Murphy <robin.murphy@arm.com> Framebuffer console and /dev/fb0 access for the motherboard CLCD works, and it keeps out of the way as expected with CONFIG_DRM_HDLCD=y. I can't convince an X session to start, but that appears more to do with sii902x falling apart*, which I can't be bothered to even try debugging. Robin. *specifically, lots of this, which I imagine is related to xorg trying to either read the EDID or change mode: ... [ 243.439669] i2c i2c-0: sendbytes: NAK bailout. [ 243.454247] i2c i2c-0: sendbytes: NAK bailout. [ 247.743261] i2c i2c-0: sendbytes: NAK bailout. [ 247.770281] sii902x 0-0039: failed to read status (-6) [ 247.786609] i2c i2c-0: sendbytes: NAK bailout. [ 248.118522] i2c i2c-0: sendbytes: NAK bailout. [ 248.145485] sii902x 0-0039: failed to read status (-6) [ 248.177800] i2c i2c-0: sendbytes: NAK bailout. [ 258.256500] i2c i2c-0: sendbytes: NAK bailout. [ 258.274763] i2c i2c-0: sendbytes: NAK bailout. [ 268.499637] i2c i2c-0: sendbytes: NAK bailout. [ 268.517899] i2c i2c-0: sendbytes: NAK bailout.
That's a long standing issue that I've never got to the bottom of. The sii902x seems to have been wired in a curious way on the VExpress board and it is struggling to pass-through the I2C connection to the monitor. Best regards, Liviu
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