[PATCH 0/7] Add support for Mediatek mt8167 HDMI display output

[Luca Leonardo Scorcia <l.scorcia@gmail.com>]

The MediaTek mt8167 SoC supports HDMI output via a dedicated HDMI PHY
driven by the DPI1 display block.

Support for HDMI output was partially upstreamed in 2021, but is currently
not functional as it's missing its HDMI PHY driver. The HDMI PHY is
apparently similar to the mt2701 one, but some differences in timings and
in the initialization sequence are better expressed with a separate driver.

* Patch 1, 2 add support for the HDMI PHY.

In addition to the HDMI PHY, a few fixes are required here and there to
actually get HDMI output.

* Patch 3: Some of the HDMI registers are mapped into the apmixedsys
  syscon. Since they are manipulated inside the HDMI PHY driver, we change
  the apmixedsys memory map to non exclusive by switching it from
  devm_platform_ioremap_resource to of_iomap. This approach was copied
  from mt8173 apmixedsys syscon.

* Patch 4: Since the DPI1 interface is hardwired to the HDMI PHY, it is
  appropriate for the HDMI PHY to control the DPI1 clocks. There is no
  effect on DPI0 clocks as they're completely separate.

* Patch 5: Some MediaTek SoCs require a supervisor call to enable HDMI
  output. mt8167 is not one of those.

* Patch 6: In the common path for mt2701/mt8167, a register operation that
  is meant to enable the HDMI_PSECUR_EN bit is actually touching some
  other bits that are set by later operations anyway. The patch makes
  more explicit the intent of the operation by setting only the necessary
  bit.

* Patch 7: Adds the device tree nodes to the mt8167 dtsi. Since DPI1
  is hardwired to HDMI it is possible to bind the input port of the HDMI
  node to the output port of DPI1, but the patch that adds the DPI nodes
  to the DTSI [1] has not been picked up yet, so we leave it disconnected
  for now.

The series was tested at all supported resolutions on the Sony PlayStation
Classic Mini.

[1] https://lore.kernel.org/linux-mediatek/20260921113914.779393-5-l.scorcia@gmail.com/

Luca Leonardo Scorcia (7):
  dt-bindings: mediatek: hdmi-phy: Add compatible for mt8167
  phy: mediatek: hdmi: Add support for mt8167
  clk: mediatek: mt8167: Map apmixedsys iomem as shared
  clk: mediatek: mt8167: Correct HDMI-related clock definitions
  drm/mediatek: mtk_hdmi: Set tz_disabled for mt8167
  drm/mediatek: mtk_hdmi: Improve the secure output bit toggle
  arm64: dts: mediatek: mt8167: Add HDMI display nodes

 .../bindings/phy/mediatek,hdmi-phy.yaml       |   1 +
 arch/arm64/boot/dts/mediatek/mt8167.dtsi      |  62 +++++
 drivers/clk/mediatek/clk-mt8167-apmixedsys.c  |  26 ++-
 drivers/clk/mediatek/clk-mt8167.c             |   6 +-
 drivers/gpu/drm/mediatek/mtk_hdmi.c           |   3 +-
 drivers/gpu/drm/mediatek/mtk_hdmi_regs.h      |   1 +
 drivers/phy/mediatek/Makefile                 |   1 +
 drivers/phy/mediatek/phy-mtk-hdmi-mt8167.c    | 217 ++++++++++++++++++
 drivers/phy/mediatek/phy-mtk-hdmi.c           |   3 +
 drivers/phy/mediatek/phy-mtk-hdmi.h           |   1 +
 10 files changed, 314 insertions(+), 7 deletions(-)
 create mode 100644 drivers/phy/mediatek/phy-mtk-hdmi-mt8167.c


base-commit: a90ee4305c4a5df72c11b31dacfdc76e00fcf78a
-- 
2.43.0