drivers/aspeed/common: Add AST2600 support

Add support for AST2600 as found on Intel Archer City CRB by using
the code found on Linux's ast drm driver.

While on it do minor modifications found on the Linux drm driver
that also affect the other ast chips.

New log messages:
[INFO ]  ASpeed AST2050: initializing video device
[INFO ]  ast_detect_chip: VGA not enabled on entry, requesting chip POST
[INFO ]  ast_detect_config_mode: Using P2A bridge for configuration
[INFO ]  ast_detect_chip: AST 2600 detected
[INFO ]  ast_detect_chip: Analog VGA only
[INFO ]  ast_driver_load: dram MCLK=890316000 MHz type=3 bus_width=16 size=01000000
[ERROR]  No header found
[INFO ]  ast_select_mode: Failed to decode EDID
[DEBUG]  Assuming VGA for KVM
[DEBUG]  AST: Display has 1024px x 768px
[DEBUG]  Using framebuffer 1024px x 768px pitch 4096 @ 32 BPP
[INFO ]  framebuffer_info: bytes_per_line: 4096, bits_per_pixel: 32
[INFO ]                     x_res x y_res: 1024 x 768, size: 3145728 at 0x94000000
[INFO ]  ASpeed high resolution framebuffer initialized

TEST: Booted on Intel/ArcherCity CRB and used the UEFI firmware menu
      over KVM using native graphics init.

Change-Id: I3d2d58d493706673c1b2ba4953967b1641bd6395
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84425
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Shuo Liu <shuo.liu@intel.com>

0 files changed, 0 insertions, 0 deletions