[PATCH v4 00/11] drm/sun4i: hdmi: Support HDMI controller on A31

[Chen-Yu Tsai]

Hi everyone,

This is v4 of my A31 HDMI support series. The DTS patches depend on
the patch "clk: sunxi-ng: sun6i: Export video PLLs" alreay merged.
The DRM patches depend on "regmap: add iopoll-like polling macro for
regmap_field" already merged on a topic branch in the regmap repository.

Changes since v3:

    - Renamed sun4i_get_first_tcon() to sun4i_get_tcon0()

    - Made sun4i_get_tcon0() return NULL when it fails, and
      sun6i_tcon_set_mux() will error out if that happens.

    - Removed has_unknown_mux field in tcon_quirks structure,
      as its function is replaced by the per-soc muxing function
      pointer.

    - Dropped clk and regmap patches that were merged.

Changes since v2:

    - TCON muxing moved into functions for each platform, with pointers
      to them in the TCON quirks structure.

    - CCU "hdmi-ddc" clock renamed to "ddc".

    - Added Maxime's acks.

Changes since v1:

    - Core changes to sun4i-drm to support two display pipelines
      have been merged into drm-misc and thus dropped from this
      version

    - Reworked DDC variant support onto new exposed I2C interface bits.

    - Reworked DDC variant support to use regmap_fields.

    - Patches to add variant support to various (TMDS, DDC, HDMI
      controller) sub-blocks have been merged into one patch.

This series adds support for the HDMI controller found on Allwinner
A31/A31s SoCs. It builds upon Maxime's work that added support for
the HDMI controller on the Allwinner A10s SoC.

The HDMI controllers in the older generation Allwinner SoCs is very
similar. The A10/A10s/A20 all have the same hardware block, with the
A10 having slightly different initial configuration values. The A31's
variant splits out the DDC parent clock, has different formulas for
the DDC and TMDS clocks, and a different register layout for the DDC
block. Also, it does not expose the CEC pins outside of the SoC, which
is unfortunate.

Patch 1 moves the existing TCON muxing code for the A13 into a separate
function, pointed to by by function pointer in the quirks structure.
The existing sun4i_tcon_set_mux() function calls the function pointer
if it is set.

Patch 2 adds support for the TCON demuxing feature on the A31. This is
needed if the user wants to output through HDMI from the second display
pipeline.

Patch 3 adds proper error path cleanup to the HDMI driver.

Patch 4 adds a regmap for the HDMI driver, to be used in a subsequent
patch.

Patch 5 allows the HDMI TMDS clock to use the second PLL as its parent,
in case the first PLL is driving an incompatible dot clock.

Patch 6 adds the A31 HDMI controller variant to the device tree binding.

Patch 7 adds support for different variants of the HDMI controller
hardware, with the differences mentioned in the beginning of this
letter.

Patch 8 adds defines for the A31 specific DDC register offsets.

Patch 9 adds support for the A31's HDMI controller variant.

Patch 10 adds a device node for the HDMI controller on the A31.

Patch 11 enable HDMI video output on three boards that I have.


I also had simultaneous output on both display pipelines on the SinA31s,
one with an LCD panel and the other using HDMI. After boot, both screens
showed a proper console. The HDMI screen had higher resolution, so the
console was limited to the upper left corner.

Note that this series does not deal with conflicting pixel clocks.

As I still don't have a freedesktop.org account [1] to access drm-misc,
Maxime will have to apply the patches for me.


Regards
ChenYu


[1] https://bugs.freedesktop.org/show_bug.cgi?id=102920

Chen-Yu Tsai (11):
  drm/sun4i: tcon: Add variant callback for TCON output muxing
  drm/sun4i: tcon: Add support for demuxing TCON output on A31
  drm/sun4i: hdmi: Disable clks in bind function error path and unbind
    function
  drm/sun4i: hdmi: create a regmap for later use
  drm/sun4i: hdmi: Allow using second PLL as TMDS clk parent
  dt-bindings: display: sun4i: Add binding for A31 HDMI controller
  drm/sun4i: hdmi: Add support for controller hardware variants
  drm/sun4i: hdmi: Add A31 specific DDC register definitions
  drm/sun4i: hdmi: Add support for A31's HDMI controller
  ARM: dts: sun6i: Add device node for HDMI controller
  ARM: dts: sun6i: Enable HDMI support on some A31/A31s devices

 .../bindings/display/sunxi/sun4i-drm.txt           |   3 +
 arch/arm/boot/dts/sun6i-a31-hummingbird.dts        |  21 ++
 arch/arm/boot/dts/sun6i-a31.dtsi                   |  55 +++++
 arch/arm/boot/dts/sun6i-a31s-primo81.dts           |  25 +++
 arch/arm/boot/dts/sun6i-a31s-sina31s.dts           |  25 +++
 drivers/gpu/drm/sun4i/sun4i_hdmi.h                 | 107 ++++++++++
 drivers/gpu/drm/sun4i/sun4i_hdmi_ddc_clk.c         |  38 +++-
 drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c             | 204 +++++++++++++++---
 drivers/gpu/drm/sun4i/sun4i_hdmi_i2c.c             | 227 +++++++++++++++------
 drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c        |  68 +++---
 drivers/gpu/drm/sun4i/sun4i_tcon.c                 |  91 +++++++--
 drivers/gpu/drm/sun4i/sun4i_tcon.h                 |   6 +-
 12 files changed, 727 insertions(+), 143 deletions(-)

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2.14.2