drm/meson: Add support for HDMI encoder and DW-HDMI bridge + PHY

The Amlogic Meson GXBB/GXL/GXM SoCs embeds a Synopsys DesignWare HDMI TX
Controller with a custom Bridge + PHY around the Controller.

This driver makes uses of all the custom PHY plat data callbacks and enables
the compatible HDMI modes to be configured as a drm_encoder instance.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

drivers/gpu/drm/meson/Kconfig

@@ -7,3 +7,9 @@ config DRM_MESON
 	select DRM_GEM_CMA_HELPER
 	select VIDEOMODE_HELPERS
 	select REGMAP_MMIO
+
+config DRM_MESON_DW_HDMI
+	tristate "HDMI Synopsys Controller support for Amlogic Meson Display"
+	depends on DRM_MESON
+	default y if DRM_MESON
+	select DRM_DW_HDMI

drivers/gpu/drm/meson/Makefile

@@ -2,3 +2,4 @@ meson-drm-y := meson_drv.o meson_plane.o meson_crtc.o meson_venc_cvbs.o
 meson-drm-y += meson_viu.o meson_vpp.o meson_venc.o meson_vclk.o meson_canvas.o
 
 obj-$(CONFIG_DRM_MESON) += meson-drm.o
+obj-$(CONFIG_DRM_MESON_DW_HDMI) += meson_dw_hdmi.o

drivers/gpu/drm/meson/meson_drv.h

@@ -47,6 +47,9 @@ struct meson_drm {
 
 	struct {
 		unsigned int current_mode;
+		bool hdmi_repeat;
+		bool venc_repeat;
+		bool hdmi_use_enci;
 	} venc;
 };