[RFC,00/10,v2] drm/i915/spi: discrete graphics internal spi

Message

Winkler, Tomas March 8, 2021, 6:27 a.m. UTC

Intel discrete graphic devices have internal spi storage, that holds
firmware and oprom images. The spi device is exposed to the user space
via mtd framework to be accessed during manufacturing.
The device is hardware locked after manufacturing and only read access
is provided.

The i915 plays role of a multi function device (mfd) and spi device
is exposed as its child device. i915_spi platform driver binds to 
this device.

Because the graphic card may undergo reset at any time and basically hot
unplug all its child devices, this series also provides a fix to the mtd
framework to make the reset graceful.

V2: 
1. Adding separate Makefile for i915_spi module
2. Adding MAINTAINERS entry
3. Addressing other small comments
4. Haven't got comments from the MTD maintainers so just resending the
patch.



Tomas Winkler (10):
  drm/i915/spi: add spi device for discrete graphics
  drm/i915/spi: intel_spi_region map
  drm/i915/spi: add driver for on-die spi device
  drm/i915/spi: implement regions enumeration
  drm/i915/spi: implement spi access functions
  drm/i915/spi: spi register with mtd
  drm/i915/spi: mtd: implement access handlers
  drm/i915/spi: serialize spi access
  MAINTAINERS: add Intel i915 spi driver entry
  mtd: use refcount to prevent corruption

 MAINTAINERS                          |  11 +
 drivers/gpu/drm/i915/Kconfig         |   3 +
 drivers/gpu/drm/i915/Makefile        |   4 +
 drivers/gpu/drm/i915/i915_drv.c      |   7 +
 drivers/gpu/drm/i915/i915_drv.h      |   4 +
 drivers/gpu/drm/i915/i915_reg.h      |   1 +
 drivers/gpu/drm/i915/spi/Kconfig     |  17 +
 drivers/gpu/drm/i915/spi/Makefile    |   7 +
 drivers/gpu/drm/i915/spi/i915_spi.c  | 675 +++++++++++++++++++++++++++
 drivers/gpu/drm/i915/spi/intel_spi.c |  49 ++
 drivers/gpu/drm/i915/spi/intel_spi.h |  22 +
 drivers/mtd/mtdcore.c                |  64 ++-
 drivers/mtd/mtdcore.h                |   1 +
 drivers/mtd/mtdpart.c                |  13 +-
 include/linux/mtd/mtd.h              |   2 +-
 15 files changed, 848 insertions(+), 32 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/spi/Kconfig
 create mode 100644 drivers/gpu/drm/i915/spi/Makefile
 create mode 100644 drivers/gpu/drm/i915/spi/i915_spi.c
 create mode 100644 drivers/gpu/drm/i915/spi/intel_spi.c
 create mode 100644 drivers/gpu/drm/i915/spi/intel_spi.h