[PATCH v3 00/22] Associate ddc adapters with connectors

Andrzej Pietrasiewicz andrzej.p at collabora.com
Fri Jun 28 09:01:14 PDT 2019


It is difficult for a user to know which of the i2c adapters is for which
drm connector. This series addresses this problem.

The idea is to have a symbolic link in connector's sysfs directory, e.g.:

ls -l /sys/class/drm/card0-HDMI-A-1/ddc
lrwxrwxrwx 1 root root 0 Jun 24 10:42 /sys/class/drm/card0-HDMI-A-1/ddc \
	-> ../../../../soc/13880000.i2c/i2c-2

The user then knows that their card0-HDMI-A-1 uses i2c-2 and can e.g. run
ddcutil:

ddcutil -b 2 getvcp 0x10
VCP code 0x10 (Brightness                    ): current value =    90, max value =   100

The first patch in the series adds struct i2c_adapter pointer to struct
drm_connector. If the field is used by a particular driver, then an
appropriate symbolic link is created by the generic code, which is also added
by this patch.

The second patch is an example of how to convert a driver to this new scheme.

v1..v2:

- used fixed name "ddc" for the symbolic link in order to make it easy for
userspace to find the i2c adapter

v2..v3:

- converted as many drivers as possible.

PATCHES 3/22-22/22 SHOULD BE CONSIDERED RFC!

Andrzej Pietrasiewicz (22):
  drm: Include ddc adapter pointer in struct drm_connector
  drm/exynos: Provide ddc symlink in connector's sysfs
  drm: rockchip: Provide ddc symlink in rk3066_hdmi sysfs directory
  drm: rockchip: Provide ddc symlink in inno_hdmi sysfs directory
  drm/msm/hdmi: Provide ddc symlink in hdmi connector sysfs directory
  drm/sun4i: hdmi: Provide ddc symlink in sun4i hdmi connector sysfs
    directory
  drm/mediatek: Provide ddc symlink in hdmi connector sysfs directory
  drm/tegra: Provide ddc symlink in output connector sysfs directory
  drm/imx: imx-ldb: Provide ddc symlink in connector's sysfs
  drm/imx: imx-tve: Provide ddc symlink in connector's sysfs
  drm/vc4: Provide ddc symlink in connector sysfs directory
  drm: zte: Provide ddc symlink in hdmi connector sysfs directory
  drm: zte: Provide ddc symlink in vga connector sysfs directory
  drm/tilcdc: Provide ddc symlink in connector sysfs directory
  drm: sti: Provide ddc symlink in hdmi connector sysfs directory
  drm/mgag200: Provide ddc symlink in connector sysfs directory
  drm/ast: Provide ddc symlink in connector sysfs directory
  drm/bridge: dumb-vga-dac: Provide ddc symlink in connector sysfs
    directory
  drm/bridge: dw-hdmi: Provide ddc symlink in connector sysfs directory
  drm/bridge: ti-tfp410: Provide ddc symlink in connector sysfs
    directory
  drm/amdgpu: Provide ddc symlink in connector sysfs directory
  drm/radeon: Provide ddc symlink in connector sysfs directory

 .../gpu/drm/amd/amdgpu/amdgpu_connectors.c    | 70 +++++++++++-----
 drivers/gpu/drm/ast/ast_mode.c                |  1 +
 drivers/gpu/drm/bridge/dumb-vga-dac.c         | 19 ++---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c     | 40 ++++-----
 drivers/gpu/drm/bridge/ti-tfp410.c            | 19 ++---
 drivers/gpu/drm/drm_sysfs.c                   |  7 ++
 drivers/gpu/drm/exynos/exynos_hdmi.c          | 11 ++-
 drivers/gpu/drm/imx/imx-ldb.c                 | 13 ++-
 drivers/gpu/drm/imx/imx-tve.c                 |  8 +-
 drivers/gpu/drm/mediatek/mtk_hdmi.c           |  9 +-
 drivers/gpu/drm/mgag200/mgag200_mode.c        |  1 +
 drivers/gpu/drm/msm/hdmi/hdmi_connector.c     |  1 +
 drivers/gpu/drm/radeon/radeon_connectors.c    | 82 ++++++++++++++-----
 drivers/gpu/drm/rockchip/inno_hdmi.c          | 17 ++--
 drivers/gpu/drm/rockchip/rk3066_hdmi.c        | 17 ++--
 drivers/gpu/drm/sti/sti_hdmi.c                |  1 +
 drivers/gpu/drm/sun4i/sun4i_hdmi.h            |  1 -
 drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c        | 14 ++--
 drivers/gpu/drm/tegra/drm.h                   |  1 -
 drivers/gpu/drm/tegra/output.c                | 12 +--
 drivers/gpu/drm/tegra/sor.c                   |  6 +-
 drivers/gpu/drm/tilcdc/tilcdc_tfp410.c        |  1 +
 drivers/gpu/drm/vc4/vc4_hdmi.c                | 16 ++--
 drivers/gpu/drm/zte/zx_hdmi.c                 | 25 ++----
 drivers/gpu/drm/zte/zx_vga.c                  | 25 ++----
 include/drm/drm_connector.h                   | 11 +++
 26 files changed, 252 insertions(+), 176 deletions(-)

-- 
2.17.1




More information about the Linux-mediatek mailing list