tree b14750a924f1384018f2b56854bb82a0803441a4
parent 7e08e5d2803914af4e46280b558ec1307ead9031
author Arthur Heymans <arthur@aheymans.xyz> 1772560332 +0100
committer Nico Huber <nico.h@gmx.de> 1782638648 +0000

gma g45: Add support for Intel GM965 (Crestline)

Add GM965 as a new CPU type under the G45 generation. GM965 shares
the GMCH display architecture with G45/GM45 (no PCH, same connector
registers) but differs in PLL limits, VCO/CDClk tables, and register
field encoding.

Key differences from G45/GM45:
 - PLL limits: Uses i9xx limits (VCO 1.4-2.8 GHz) instead of g4x
   limits. Add I9XX_LVDS_Limits; refactor Calculate_Clock_Parameters
   to take Limits as a parameter, with a new Select_Limits function.
 - VCO: Uses Crestline (CL) VCO tables with different frequencies
   and divisors than GM45's Cantiga (CTG) tables.
 - CDClk: GCFGC register decoding uses bits 12:8 minus 1 (3 possible
   divisor selections), unlike GM45's single bit 12.
 - No native DisplayPort (SDVO B/C only).
 - No HD Audio (G4X_AUD_VID_DID reads as 0).
 - Has integrated LVDS transmitter (mobile platform).
 - PCI IDs: 0x2a02 (I965_GM), 0x2a12 (I965_GME).

All implementation details cross-referenced against the Linux kernel
i915 driver (intel_dpll.c, intel_cdclk.c, intel_display_device.c).

Change-Id: I0d5d698cc1c2aa84778f0fc6c2752cb5ce4f1cb2
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.sourcearcade.org/c/libgfxinit/+/499
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: Nico Huber <nico.h@gmx.de>