[PATCH 00/27] Converter R-Car DU to the DRM bridge connector helper

[Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>]

Hello,

This patch series converts the R-Car DU driver to use the DRM bridge
connector helper drm_bridge_connector_init().

The bulk of the series is conversion of the adv7511, simple-bridge,
rcar-lbds and dw-hdmi drivers to make connector creation optional
(through the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag).

The series starts with the adv7511 driver, previously posted as "[PATCH
0/4] drm: bridge: adv7511: Enable usage with DRM bridge connector
helper" ([1]). Patches 01/27 to 04/27 incorporate all the received
review comments.

The next three patches address the simple-bridge driver, previously
posted as "[PATCH 0/2] drm: bridge: simple-bridge: Enable usage with DRM
bridge connector helper". Patch 05/27 is an additional fix that stems
from the review, and patches 06/27 and 07/27 incorporate all the
received review comments.

Patch 08/27 is a new patch that addresses the rcar-lvds driver. Instead
of implementing direct support for DRM_BRIDGE_ATTACH_NO_CONNECTOR, it
simply removes code that shouldn't have been in the driver in the first
place by switching to the panel bridge helper.

Patches 09/27 to 22/27 then address the dw-hdmi driver. That's a more
sizeable rework, due to the fact that the driver implements a mid-layer
for platform-specific glue, with the internal drm_connector being used
throughout the whole code. There's no rocket science there, but patch
10/27 should be noted for adding a new argument to the
drm_bridge_funcs.mode_valid() function. Please see individual patches
for details.

Patch 23/27 adds support to the dw-hdmi driver to attach to a downstream
bridge if one is specified in DT. As the DT port number corresponding to
the video output differs between platforms that integrate the dw-hdmi
(some of them even don't have a video output port, which should probably
be fixed, but that's out of scope for this series), the port number has
to be specified by the platform glue layer. Patch 24/27 does so for the
R-Car dw-hdmi driver.

Patch 25/27 is a drive-by fix for an error path issue in the rcar-du
driver. Patch 26/27 finally makes use of the drm_bridge_connector_init()
helper.

Unfortunately, this breaks the VGA output on R-Car Gen3 platforms. On
those platforms, the VGA DDC lines are not connected, and there is no
mean for software to detect the VGA output connection status. When the
simple-bridge driver creates a connector, it automatically adds default
modes when no DDC is available. This behavious is also present int the
DRM probe helper drm_helper_probe_single_connector_modes(), but only
when the connector status is connector_status_connected. As the driver
(rightfully) reports connector_status_unconnected, no modes are added.
Patch 27/27 fixes this issue by extending addition of default modes in
drm_helper_probe_single_connector_modes() when the output status is
unknown. An alternative approach would be to implement this behaviour in
the bridge connector helper (drm_bridge_connector.c).

All the modified drivers have been compile-tested, and the series has
been tested on a Renesas R-Car Salvator-XS board with the VGA, HDMI and
LVDS outputs.

[1] https://lore.kernel.org/dri-devel/20200409004610.12346-1-laurent.pinchart+renesas@ideasonboard.com/
[2] https://lore.kernel.org/dri-devel/20200409003636.11792-1-laurent.pinchart+renesas@ideasonboard.com/

Laurent Pinchart (27):
  drm: bridge: adv7511: Split EDID read to a separate function
  drm: bridge: adv7511: Split connector creation to a separate function
  drm: bridge: adv7511: Implement bridge connector operations
  drm: bridge: adv7511: Make connector creation optional
  drm: bridge: Return NULL on error from drm_bridge_get_edid()
  drm: bridge: simple-bridge: Delegate operations to next bridge
  drm: bridge: simple-bridge: Make connector creation optional
  drm: rcar-du: lvds: Convert to DRM panel bridge helper
  drm: edid: Constify connector argument to infoframe functions
  drm: bridge: Pass drm_display_info to drm_bridge_funcs .mode_valid()
  drm: bridge: dw-hdmi: Pass private data pointer to .mode_valid()
  drm: bridge: dw-hdmi: Pass private data pointer to .configure_phy()
  drm: bridge: dw-hdmi: Remove unused field from dw_hdmi_plat_data
  drm: meson: dw-hdmi: Use dw_hdmi context to replace hack
  drm: bridge: dw-hdmi: Pass drm_display_info to .mode_valid()
  drm: bridge: dw-hdmi: Constify mode argument to dw_hdmi_phy_ops
    .init()
  drm: bridge: dw-hdmi: Constify mode argument to internal functions
  drm: bridge: dw-hdmi: Pass drm_display_info to dw_hdmi_support_scdc()
  drm: bridge: dw-hdmi: Split connector creation to a separate function
  drm: bridge: dw-hdmi: Store current connector in struct dw_hdmi
  drm: bridge: dw-hdmi: Pass drm_connector to internal functions as
    needed
  drm: bridge: dw-hdmi: Make connector creation optional
  drm: bridge: dw-hdmi: Attach to next bridge if available
  drm: rcar-du: dw-hdmi: Set output port number
  drm: rcar-du: Fix error handling in rcar_du_encoder_init()
  drm: rcar-du: Use drm_bridge_connector_init() helper
  drm: Add default modes for connectors in unknown state

 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c  | 159 +++++---
 .../drm/bridge/analogix/analogix-anx6345.c    |   1 +
 .../drm/bridge/analogix/analogix-anx78xx.c    |   1 +
 drivers/gpu/drm/bridge/cdns-dsi.c             |   1 +
 drivers/gpu/drm/bridge/chrontel-ch7033.c      |   1 +
 drivers/gpu/drm/bridge/nwl-dsi.c              |   1 +
 drivers/gpu/drm/bridge/sii9234.c              |   1 +
 drivers/gpu/drm/bridge/sil-sii8620.c          |   1 +
 drivers/gpu/drm/bridge/simple-bridge.c        | 113 +++---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 357 ++++++++++++------
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c |   1 +
 drivers/gpu/drm/bridge/tc358767.c             |   1 +
 drivers/gpu/drm/bridge/tc358768.c             |   1 +
 drivers/gpu/drm/bridge/thc63lvd1024.c         |   1 +
 drivers/gpu/drm/bridge/ti-tfp410.c            |  11 +-
 drivers/gpu/drm/drm_atomic_helper.c           |   3 +-
 drivers/gpu/drm/drm_bridge.c                  |  10 +-
 drivers/gpu/drm/drm_edid.c                    |  12 +-
 drivers/gpu/drm/drm_probe_helper.c            |   7 +-
 drivers/gpu/drm/i2c/tda998x_drv.c             |   1 +
 drivers/gpu/drm/imx/dw_hdmi-imx.c             |   6 +-
 drivers/gpu/drm/meson/meson_dw_hdmi.c         |  34 +-
 drivers/gpu/drm/omapdrm/dss/dpi.c             |   1 +
 drivers/gpu/drm/omapdrm/dss/sdi.c             |   1 +
 drivers/gpu/drm/omapdrm/dss/venc.c            |   1 +
 drivers/gpu/drm/rcar-du/rcar_du_encoder.c     |  26 +-
 drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c        |   7 +-
 drivers/gpu/drm/rcar-du/rcar_lvds.c           | 124 +-----
 drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c   |   6 +-
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c         |   6 +-
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h         |   3 +-
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c        |   3 +-
 include/drm/bridge/dw_hdmi.h                  |  28 +-
 include/drm/drm_bridge.h                      |   3 +
 include/drm/drm_edid.h                        |   6 +-
 include/drm/drm_modeset_helper_vtables.h      |   8 +-
 36 files changed, 541 insertions(+), 406 deletions(-)

-- 
Regards,

Laurent Pinchart