[PATCH v2 00/29] R-Car Gen3 HDMI output support

Laurent Pinchart laurent.pinchart+renesas at ideasonboard.com
Tue Dec 20 01:33:31 UTC 2016


This patch series implements support for the HDMI output on Renesas R-Car Gen3
SoCs, and more specifically on the R-Car H3.

R-Car Gen3 SoCs include one or multiple Synopsys DWC HDMI TX controllers. The
series thus starts with 20 cleanup or feature patches for the dw-hdmi driver.
Patches 01/29 to 05/29 are small miscellaneous cleanups. Patch 06/29 fixes a
crash when the HPD interrupt is generated before the bridge gets attached to a
DRM device.

Patch 07/29 then starts refactoring the API towards platform glue by moving
common I/O and clock resource allocation to common code. Patches 08/29 and
09/29 continue by moving connector creation to the bridge attach operation to
comply with the DRM bridge API. Patch 10/29 implements a new API for platform
glue to register the bridge with the DRM core, for platform that doesn't use
the component framework.

Patches 11/29 to 20/29 refactor platform support in the dw-hdmi driver. This
is the largest change compared to v1. Patch 11/29 is a small cleanup and patch
12/29 a register rename to match available documentation. Patch 13/29 starts
making use of the hardware product ID to reject invalid devices and patch
14/29 and 15/29 continue with refactoring of audio DMA detection and overflow
workaround handling based on the device version. Patch 16/29 adds PHY type
detection at runtime and patch 17/29 reworks PHY power handling accordingly.
Patches 18/29 and 19/29 add support for custom PHYs, and patch 20/29 finally
removes the now unneeded device type field from platform data.

The next three patches add glue code for the DWC HDMI on Renesas R-Car Gen3
platforms. Patch 21/29 rework the DWC HDMI DT bindings to make them more
modular, and patch 22/29 makes use of them to document the R-Car Gen DWC HDMI
TX DT bindings. Patch 23/29 then implements the platform glue code.

The next three patches implement support for the R8A7795 HDMI outputs in the
R-Car DU driver. Patch 24/29 fixes a bug that makes the driver defer probe
forever if an encoder is disabled. Patch 25/29 implements DPLL support to
generate more precise clocks required by the HDMI controller, and patch 26/29
then enables the two HDMI output on the R-Car H3 SoC.

The last three patches enable the HDMI outputs on the H3 Salvator-X board by
adding the HDMI encoders to the R-Car H3 DT (27/29), adding HDMI connectors
and enabling the encoders (28/29) and adding the external dot clocks (29/29).

I have tested the code on a Renesas Salvator-X H3 board, a Rockchip RK3288
Rock2 board and an IMX6Q Rex Pro board. No issue due to the dw-hdmi rework
have been observed.

More improvements to the dw-hdmi driver would be beneficial. The PHY
modularization is based on the limited understanding of the HDMI PHYs used on
the three supported platforms and will possibly be enhanced later when adding
support for more platforms. The PHY used on Renesas platforms is probably
generic, but due to limited documentation and unavailability of public
datasheets from Synopsys I can't at the moment determine if the code could be
shared. I propose addressing this when another platform will be merged in
mainline using the same PHY.

The DT bindings would also benefit from a standardized definition of the
ports, and the reg-io-width property could possibly be deprecated in favour of
encoding the information in platform glue code. The patch series is however
big enough as is to be submitted for review and merge before the dw-hdmi
driver achieves perfection.

Kieran Bingham (4):
  drm: bridge: dw-hdmi: Remove unused function parameter
  drm: bridge: dw-hdmi: Remove PHY configuration resolution parameter
  drm: bridge: dw-hdmi: Add support for custom PHY configuration
  drm: bridge: dw-hdmi: Remove device type from platform data

Koji Matsuoka (4):
  drm: rcar-du: Add Gen3 HDMI encoder support
  drm: rcar-du: Add DPLL support
  drm: rcar-du: Add HDMI outputs to R8A7795 device description
  arm64: dts: r8a7795: salvator-x: Enable HDMI outputs

Laurent Pinchart (20):
  drm: bridge: dw-hdmi: Merge __hdmi_phy_i2c_write and
  drm: bridge: dw-hdmi: Remove unneeded arguments to bind/unbind
  drm: bridge: dw-hdmi: Embed drm_bridge in struct dw_hdmi
  drm: bridge: dw-hdmi: Remove encoder field from struct dw_hdmi
  drm: bridge: dw-hdmi: Don't forward HPD events to DRM core before
  drm: bridge: dw-hdmi: Move IRQ and IO resource allocation to common
  drm: bridge: dw-hdmi: Reorder functions to prepare for next commit
  drm: bridge: dw-hdmi: Create connector in the bridge attach operation
  drm: bridge: dw-hdmi: Implement DRM bridge registration
  drm: bridge: dw-hdmi: Rename CONF0 SPARECTRL bit to SVSRET
  drm: bridge: dw-hdmi: Reject invalid product IDs
  drm: bridge: dw-hdmi: Detect AHB audio DMA using correct register
  drm: bridge: dw-hdmi: Handle overflow workaround based on device
  drm: bridge: dw-hdmi: Detect PHY type at runtime
  drm: bridge: dw-hdmi: Refactor PHY power handling
  drm: bridge: dw-hdmi: Move CSC configuration out of PHY code
  dt-bindings: display: dw-hdmi: Clean up DT bindings documentation
  dt-bindings: display: renesas: Add R-Car Gen3 HDMI TX DT bindings
  drm: rcar-du: Skip disabled outputs
  arm64: dts: r8a7795: salvator-x: Add DU1 and DU2 external dot clocks

Ulrich Hecht (1):
  arm64: dts: r8a7795: Add HDMI encoder support

 .../devicetree/bindings/display/bridge/dw_hdmi.txt |  85 ++--
 .../bindings/display/bridge/renesas,dw-hdmi.txt    |  75 +++
 .../devicetree/bindings/display/imx/hdmi.txt       |  51 +-
 .../bindings/display/rockchip/dw_hdmi-rockchip.txt |  43 +-
 MAINTAINERS                                        |   1 +
 arch/arm64/boot/dts/renesas/r8a7795-salvator-x.dts |  73 +++
 arch/arm64/boot/dts/renesas/r8a7795.dtsi           |  50 ++
 drivers/gpu/drm/bridge/dw-hdmi.c                   | 557 +++++++++++++--------
 drivers/gpu/drm/bridge/dw-hdmi.h                   |  16 +-
 drivers/gpu/drm/imx/dw_hdmi-imx.c                  |  16 +-
 drivers/gpu/drm/rcar-du/Kconfig                    |   8 +
 drivers/gpu/drm/rcar-du/Makefile                   |   1 +
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c             |  81 ++-
 drivers/gpu/drm/rcar-du/rcar_du_crtc.h             |   4 +-
 drivers/gpu/drm/rcar-du/rcar_du_drv.c              |  13 +-
 drivers/gpu/drm/rcar-du/rcar_du_drv.h              |   1 +
 drivers/gpu/drm/rcar-du/rcar_du_kms.c              |   7 +
 drivers/gpu/drm/rcar-du/rcar_du_regs.h             |  23 +
 drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c             | 100 ++++
 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c        |  15 +-
 include/drm/bridge/dw_hdmi.h                       |  29 +-
 21 files changed, 923 insertions(+), 326 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt
 create mode 100644 drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c


Laurent Pinchart

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