On Mon, Apr 23, 2018 at 2:04 PM, Robin Murphy <robin.murphy@xxxxxxx> wrote:
> I've given this a go on the nearest VExpress (with CA15_A7 tile) and sadly
> it doesn't quite work for me :( With the HDLCD driver configure out, the
> PL111 driver seems to repeatedly defer somewhere past
> pl111_versatile_init():
>
> root@jet-set-radio:~# dmesg | grep -i lcd
> [ 2.739358] drm-clcd-pl111 1c1f0000.clcd: sysreg has not yet probed
> [ 3.406534] drm-clcd-pl111 1c1f0000.clcd: initializing Versatile Express
> PL111
> [ 3.428218] drm-clcd-pl111 1c1f0000.clcd: DVI muxed to motherboard CLCD
> [ 3.898768] drm-clcd-pl111 1c1f0000.clcd: initializing Versatile Express
> PL111
> [ 3.920441] drm-clcd-pl111 1c1f0000.clcd: DVI muxed to motherboard CLCD
> [ 10.896158] drm-clcd-pl111 1c1f0000.clcd: initializing Versatile Express
> PL111
> [ 10.917839] drm-clcd-pl111 1c1f0000.clcd: DVI muxed to motherboard CLCD
> [ 18.513233] drm-clcd-pl111 1c1f0000.clcd: initializing Versatile Express
> PL111
> [ 18.535007] drm-clcd-pl111 1c1f0000.clcd: DVI muxed to motherboard CLCD
> root@jet-set-radio:~# ls /sys/bus/amba/drivers/drm-clcd-pl111/
> bind uevent unbind
>
>
> There's no obvious indication of what's missing, but it does still manage to
> do enough to make the external display come on (still showing the
> motherboard PoST screen). By comparison, the old fbdev driver probes OK and
> thinks it's set up a 640x480 console but doesn't actually turn the monitor
> on (and HDLCD doesn't probe at all due to vexpress-v2p-ca15_a7.dts lacking
> any graph endpoint).
>
> Config attached, just in case I'm missing something trivially dumb.
Hm you definately need CONFIG_CMA and CONFIG_DMA_CMA so
the driver actually uses the special memory.
I have all these:
config-drm: config-base
$(CURDIR)/scripts/config --file $(config_file) \
--disable FB_ARMCLCD \
--enable CMA \
--enable CMA_DEBUG \
--enable CMA_DEBUGFS \
--enable DMA_CMA \
--enable DRM \
--enable DRM_PL111 \
--enable FRAMEBUFFER_CONSOLE \
--enable DRM_PANEL \
--enable DRM_PANEL_SIMPLE \
--enable DRM_BRIDGE \
--enable DRM_PANEL_BRIDGE \
--enable DRM_SII902X \
--enable LOGO
Please try with the stuff above, when I switch the mainline platforms
I plan to update the defconfigs with all the above.
Yours,
Linus Walleij
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