I.MX6 HDMI support in v4.2

[khalasa@piap.pl (Krzysztof Hałasa)]

Trying to make some progress... I was missing the etnaviv DRM kernel
driver. Now I have both IMX and etnaviv drivers, Linux v4.0-stable:

git://git.pengutronix.de/git/lst/linux.git (etnaviv DRM driver)
PLL5 DTS patch (enables HDMI with LVDS driver loaded):

--- a/arch/arm/boot/dts/imx6q-gw54xx.dts
+++ b/arch/arm/boot/dts/imx6q-gw54xx.dts
@@ -21,3 +21,11 @@
 &sata {
 	status = "okay";
 };
+
+&clks {
+	assigned-clocks = <&clks IMX6QDL_CLK_LDB_DI0_SEL>,
+			  <&clks IMX6QDL_CLK_LDB_DI1_SEL>;
+	assigned-clock-parents = <&clks IMX6QDL_CLK_PLL3_USB_OTG>,
+				 <&clks IMX6QDL_CLK_PLL3_USB_OTG>;
+};
+

also had to apply:

--- a/drivers/staging/etnaviv/Makefile
+++ b/drivers/staging/etnaviv/Makefile
@@ -11,7 +11,6 @@ etnaviv-y := \
 	etnaviv_gem_submit.o \
 	etnaviv_gpu.o \
 	etnaviv_iommu.o \
-	etnaviv_iommu_v2.o \
 	etnaviv_mmu.o \
 	etnaviv_buffer.o
 

X.org etc.:
	git://github.com/laanwj/etna_viv.git
        git://ftp.arm.linux.org.uk/~rmk/libdrm-armada.git/
        git://ftp.arm.linux.org.uk/~rmk/xf86-video-armada.git unstable-devel
(I can't use master branch of xf86-video-armada.git because it doesn't
support etnaviv - does it?)

X log (relevant(?) stuff only):

[ 18919.848] (II) armada(0): hardware: imx-drm
[ 18919.923] (--) armada(0): Vivante GC320 GPU revision 5007 (etnaviv) 2d PE2.0
[ 18919.925] (II) armada(0): [DRI2] Setup complete
[ 18919.925] (II) armada(0): [DRI2]   DRI driver: etnadrm
[ 18919.925] (II) armada(0): direct rendering: DRI2 enabled
[ 18919.925] (II) armada(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[ 18919.927] (==) armada(0): DPMS enabled
[ 18919.927] (==) armada(0): hotplug detection enabled
[ 18919.928] (II) armada(0): etnaviv: Xv: using YUY2 tiled format intermediate YUV target
[ 18919.971] (EE) AIGLX error: dlopen of /lib/dri/etnadrm_dri.so failed (I don't have this yet)
[ 18920.072] (II) armada(0): etnaviv: A8 target not supported

If I try to use pengutronix/etnaviv-4.1-wip branch (etnaviv DRM - for
v4.2), dmesg contains a lot of:
 [drm:etnaviv_ioctl_gem_submit [etnaviv]] *ERROR* cmdstream bo has flag ETNA_BO_CMDSTREAM not set
and it doesn't work. I assume I shouldn't use it yet?

Changing to pengutronix/etnaviv-for-upstream, it works - sort of.

I now have two Xvideo adapters:
Adaptor: 0
Name: Marvell Armada Overlay Video
 Port: 88
(which unfortunately doesn't work, the window is black, the XV
attributes are set to minimums and I can't set them).

Is it expected?

Adaptor: 1
Name: Etnaviv Textured Video
 Port(s): 89 - 104

  Name: XV_SYNC_TO_VBLANK
   Flags: XvGettable XvSettable
   Min value: 0
   Max value: 1
   Current value: 1
  Name: XV_PIPE
   Flags: XvGettable XvSettable
   Min value: -1
   Max value: 3
   Current value: -1
  Name: XV_ENCODING
   Flags: XvGettable XvSettable
   Min value: 0
   Max value: 0
   Current value: 0

This adapter works, though there are some image distortions (horizontal
lines apparently caused by changes in color between frames).

Any input?
-- 
Krzysztof Halasa

Industrial Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland