[PATCH v2 00/14] drm/ast: Refactor the device-detection code

[Thomas Zimmermann]

Ast's code for detecting the device type and features is convoluted.
It mixes up several state fields, chip types and sub-models. Rework
the driver into something more understandable.

Patches 1 fixes a long-standing bug. The affected code has never
worked correctly.

Patches 2 to 8 make various changes to the init code, or remove dead
and duplicated code paths.

Patch 9 introduces chip generations. Until now, ast used the value
of enum ast_chip to represent a certain set of related modes, and
also used the enum to represent individal models. This makes the
driver code hard to understand in certain places. The patch encodes
a chip generation in each model enum and converts the driver to use
it.

Patches 10 to 12 replace duplicated model checks with the correct
enum value. Detection of wide-screen functionality and the transmitter
chip can then be moved into individual functions in patch 13.

Patch 14 merges the detection of the silicon revision and the chip
model into a single function. Both need to be done in the same place
and affect each other.

Tested on AST1100 and AST2300.

v2:
	* use standard 16-bit PCI access (Jingfeng)
	* various cleanups

Thomas Zimmermann (14):
  drm/ast: Fix DRAM init on AST2200
  drm/ast: Remove vga2_clone field
  drm/ast: Implement register helpers in ast_drv.h
  drm/ast: Remove dead else branch in POST code
  drm/ast: Remove device POSTing and config from chip detection
  drm/ast: Set PCI config before accessing I/O registers
  drm/ast: Enable and unlock device access early during init
  drm/ast: Set up release action right after enabling MMIO
  drm/ast: Distinguish among chip generations
  drm/ast: Detect AST 1300 model
  drm/ast: Detect AST 1400 model
  drm/ast: Detect AST 2510 model
  drm/ast: Move widescreen and tx-chip detection into separate helpers
  drm/ast: Merge config and chip detection

 drivers/gpu/drm/ast/ast_dp501.c |   6 +-
 drivers/gpu/drm/ast/ast_drv.h   |  94 +++++++---
 drivers/gpu/drm/ast/ast_main.c  | 319 +++++++++++++++++++-------------
 drivers/gpu/drm/ast/ast_mm.c    |   2 -
 drivers/gpu/drm/ast/ast_mode.c  |  35 ++--
 drivers/gpu/drm/ast/ast_post.c  |  74 ++------
 6 files changed, 290 insertions(+), 240 deletions(-)


base-commit: 32e260cd0d16cee6f33e747679f168d63ea54bf6
prerequisite-patch-id: 0aa359f6144c4015c140c8a6750be19099c676fb
prerequisite-patch-id: c67e5d886a47b7d0266d81100837557fda34cb24
prerequisite-patch-id: cbc453ee02fae02af22fbfdce56ab732c7a88c36
prerequisite-patch-id: d3145eae4b35a1290199af6ff6cd5abfebc82033
prerequisite-patch-id: 242b6bc45675f1f1a62572542d75c89d4864f15a
-- 
2.41.0