drm/ingenic: Add dw-hdmi driver specialization for jz4780

A specialisation of the generic Synopsys HDMI driver is employed for
JZ4780 HDMI support. This requires a new driver, plus device tree and
configuration modifications.

Here we add Kconfig DRM_INGENIC_DW_HDMI, Makefile and driver code.

Note that there is no hpd-gpio installed on the CI20 board HDMI
connector. Hence there is no hpd detection by the connector driver
and we have to enable polling in the dw-hdmi core driver.

For that we need to set .poll_enabled but that struct component
can only be accessed by core code. Hence we use the public
setter function drm_kms_helper_hotplug_event() introduced before.

Also note that we disable Color Space Conversion since it is not
working on jz4780.

Signed-off-by: Paul Boddie <paul@boddie.org.uk>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://patchwork.freedesktop.org/patch/msgid/e5cdf9cd44bde52cce379cc830f2d6117ea15c32.1649330171.git.hns@goldelico.com

drm/ingenic: Add support for the IPU

Add support for the Image Processing Unit (IPU) found in all Ingenic
SoCs.

The IPU can upscale and downscale a source frame of arbitrary size
ranging from 4x4 to 4096x4096 on newer SoCs, with bicubic filtering
on newer SoCs, bilinear filtering on older SoCs. Nearest-neighbour can
also be obtained with proper coefficients.

Starting from the JZ4725B, the IPU supports a mode where its output is
sent directly to the LCDC, without having to be written to RAM first.
This makes it possible to use the IPU as a DRM plane on the compatible
SoCs, and have it convert and scale anything the userspace asks for to
what's available for the display.

Regarding pixel formats, older SoCs support packed YUV 4:2:2 and various
planar YUV formats. Newer SoCs introduced support for RGB.

Since the IPU is a separate hardware block, to make it work properly the
Ingenic DRM driver will now register itself as a component master in
case the IPU driver has been enabled in the config.

When enabled in the config, the CRTC will see the IPU as a second primary
plane. It cannot be enabled at the same time as the regular primary
plane. It has the same priority, which means that it will also display
below the overlay plane.

v2: - ingenic-ipu is no longer its own module. It will be built
into the ingenic-drm module.
- If enabled in the config, both the core driver and the IPU
driver will register as components; otherwise the core
driver will bypass that and call the ingenic_drm_bind()
function directly.
- Since both files now build into the same module, the
symbols previously exported as GPL are not exported anymore,
since they are only used internally.
- Fix SPDX license header in ingenic-ipu.h
- Avoid using 'for(;;);' loops without trailing statement(s)

v3: - Pass priv structure to IRQ handler; that way we don't hardcode
the expectation that the IPU plane is at index #0.
- Rework osd_changed() to account for src_* changes
- Add multiplanar YUV 4:4:4 support
- Commit fb addresses to HW at vblank, since addr registers are
not shadow registers
- Probe IPU component later so that IPU plane is last
- Fix driver not working on IPU-less hardware
- Use IPU driver's name as the IRQ name to avoid having two
'ingenic-drm' in /proc/interrupts
- Fix IPU only working for still images on JZ4725B
- Add a bit more code comments

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716163846.174790-10-paul@crapouillou.net

drm/ingenic: Rename ingenic-drm.c to ingenic-drm-drv.c

Full rename without any modification, except to the Makefile.

Renaming ingenic-drm.c to ingenic-drm-drv.c allow to decouple the module
name from the source file name in the Makefile. This will be useful
later when more source files are added.

v2: New patch
v3: No change

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716163846.174790-4-paul@crapouillou.net

DRM: Add KMS driver for the Ingenic JZ47xx SoCs

Add a KMS driver for the Ingenic JZ47xx family of SoCs.
This driver is meant to replace the aging jz4740-fb driver.

This driver does not make use of the simple pipe helper, for the reason
that it will soon be updated to support more advanced features like
multiple planes, IPU integration for colorspace conversion and up/down
scaling, support for DSI displays, and TV-out and HDMI outputs.

Notes:
v2: - Remove custom handling of panel. The panel is now discovered using
the standard API.
- Lots of small tweaks suggested by upstream

v3: - Use devm_drm_dev_init()
- Update compatible strings to -lcd instead of -drm
- Add destroy() callbacks to plane and crtc
- The ingenic,lcd-mode is now read from the bridge's DT node

v4: Remove ingenic,lcd-mode property completely. The various modes are now
deduced from the connector type, the pixel format or the bus flags.

v5: - Fix framebuffer size incorrectly calculated for 24bpp framebuffers
- Use 32bpp framebuffer instead of 16bpp, as it'll work with both
16-bit and 24-bit panel
- Get rid of drm_format_plane_cpp() which has been dropped upstream
- Avoid using drm_format_info->depth, which is deprecated.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190603152331.23160-2-paul@crapouillou.net