[PATCH v6 00/13] drm/ast: Detect connector status for VGA and SIL164

[Thomas Zimmermann]

Detect the status of the VGA or SIL164 conenctor by polling the DDC
channel. Update the status at runtime and flip the BMC status as well.

Patches 1 adds a missing include statement that will be required to
make later patches compile.

Patches 2 and 3 simplify the VGA and SIL164 connectors, such that no
additional data structure is required. These patches have been reviewed
before as part of the series at [1].

Patches 4 to 10 improve the I2C code that is used to retrieve the
monitor's EDID data. It's now fully managed, it acquires the necessary
lock automatically and it is called DDC, which better represents its
purpose than I2C.

Patches 11 to 13 finally implement polling. Patch 11 updates ast's
EDID code to be up-to-date. The helper drm_connector_get_modes() reads
the EDID via DDC and updates the property. No driver code is required.
Patch 12 uses a similar pattern to detect the presence of the monitor
and sets the connector status accordingly. As polling also needs to be
cleaned up, patch 13 adds the necessary helpers to do so.

Tested on AST2500 hardware and BMC output. The BMC connector now also
flips its status correctly at runtime.

[1] https://patchwork.freedesktop.org/series/104547/

v6:
- rename helper to drm_connector_helper_detect_from_ddc() (Maxime, Sui)
- fix kerneldoc comment
v5:
- share implementation in drm_connector_helper_detect_ctx() (Maxime)
- test for DDC presence with drm_probe_ddc() (Maxime, Jani)
- perform managed cleanup of poll thread

Thomas Zimmermann (13):
  drm/ast: Include <linux/of.h> where necessary
  drm/ast: Fail probing if DDC channel could not be initialized
  drm/ast: Remove struct ast_{vga,sil165}_connector
  drm/ast: Allocate instance of struct ast_i2c_chan with managed helpers
  drm/ast: Move DDC code to ast_ddc.{c,h}
  drm/ast: Rename struct ast_i2c_chan to struct ast_ddc
  drm/ast: Pass AST device to ast_ddc_create()
  drm/ast: Store AST device in struct ast_ddc
  drm/ast: Rename struct i2c_algo_bit_data callbacks and their
    parameters
  drm/ast: Acquire I/O-register lock in DDC code
  drm/ast: Use drm_connector_helper_get_modes()
  drm/ast: Implement polling for VGA and SIL164 connectors
  drm/ast: Automatically clean up poll helper

 drivers/gpu/drm/ast/Makefile                 |  10 +-
 drivers/gpu/drm/ast/{ast_i2c.c => ast_ddc.c} | 120 +++++++++------
 drivers/gpu/drm/ast/ast_ddc.h                |  20 +++
 drivers/gpu/drm/ast/ast_drv.c                |   1 +
 drivers/gpu/drm/ast/ast_drv.h                |  39 +----
 drivers/gpu/drm/ast/ast_main.c               |   1 +
 drivers/gpu/drm/ast/ast_mode.c               | 147 +++++--------------
 drivers/gpu/drm/drm_probe_helper.c           |  56 +++++++
 include/drm/drm_probe_helper.h               |   6 +
 9 files changed, 207 insertions(+), 193 deletions(-)
 rename drivers/gpu/drm/ast/{ast_i2c.c => ast_ddc.c} (54%)
 create mode 100644 drivers/gpu/drm/ast/ast_ddc.h

-- 
2.44.0