gpu: drm: jz4780: Add LCD and HDMI driver

Adds LCD and HDMI driver for the jz4780.

Note: Upstream has diverged. HDMI phy driver has moved out of
staging and has been renamed. DRM_BRIDGE support has been added
to the phy.

This patch moves the 3.16 work on the driver to 'make it work'
on the CI20 with 3.18.

There will be subtle changed in the encoder/connector side.
CRTC should be the same.

Note: The jz4780 LCDC likes the framebuffer to be explicitly unpacked.
This is especially necessary for the dma to work.

Hence the DefaultFbBpp must be set to 32. Otherwise XOrg defaults to
24 and the driver doesn't work.

Sample Xorg.conf for modesetting

Section "Device"
        Identifier      "Video Device"
        Driver          "modesetting"
EndSection

Section "Monitor"
        Identifier      "Monitor"
        Option          "PreferredMode" "1920x1080"
EndSection

Section "Screen"
        Identifier      "Screen"
        Monitor         "Monitor"
        Device          "Video Device"
        DefaultFbBpp    32
EndSection

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>

Conflicts:
	drivers/gpu/drm/Kconfig
	drivers/gpu/drm/Makefile

drivers/gpu/drm/Kconfig

@@ -200,3 +200,5 @@ source "drivers/gpu/drm/tegra/Kconfig"
 source "drivers/gpu/drm/panel/Kconfig"
 
 source "drivers/gpu/drm/sti/Kconfig"
+
+source "drivers/gpu/drm/jz4780/Kconfig"

drivers/gpu/drm/Makefile

@@ -62,6 +62,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/
 obj-$(CONFIG_DRM_MSM) += msm/
 obj-$(CONFIG_DRM_TEGRA) += tegra/
 obj-$(CONFIG_DRM_STI) += sti/
+obj-$(CONFIG_DRM_JZ4780) += jz4780/
 obj-y			+= i2c/
 obj-y			+= panel/
 obj-y			+= bridge/

drivers/gpu/drm/jz4780/Kconfig

@@ -0,0 +1,13 @@
+config DRM_JZ4780
+	tristate "DRM Support for Ingenic JZ4780 LCDC Display Controller"
+	depends on DRM && OF
+	select DRM_KMS_HELPER
+	select DRM_KMS_FB_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_GEM_CMA_HELPER
+	select VIDEOMODE_HELPERS
+	select BACKLIGHT_CLASS_DEVICE
+	select BACKLIGHT_LCD_SUPPORT
+	help
+	  Choose this option if you have an Ingenic SoC with LCDC display
+	  controller, for example the CI20 board

drivers/gpu/drm/jz4780/Makefile

@@ -0,0 +1,11 @@
+ccflags-y := -Iinclude/drm
+ifeq (, $(findstring -W,$(EXTRA_CFLAGS)))
+
+endif
+
+jz4780-y := \
+	jz4780_crtc.o \
+	dwc_hdmi.o \
+	jz4780_drv.o
+
+obj-$(CONFIG_DRM_JZ4780)	+= jz4780.o