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UPSTREAM: nb/i945/gma.c: Refactor panel setup

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This reuses some of gm45 code to set up the panel.

Panel start and stop delays and pwm frequency can now be set in
devicetree.

Linux does not make the difference between 945gm and gm45
for panel delays, so it is safe to assume the semantics of those
registers are the same.

The core display clock is computed according to "Mobile Intel 945
Express Chipset Family" Datasheet.

This selects Legacy backlight mode since most targets have some smm
code that rely on this.

This sets the same backlight frequency as vendor bios on Thinkpad X60
and T60.

A default of 180Hz is selected for the PWM frequency if it is not
defined in the devicetree, this might be annoying for displays that
are LED backlit, but is a safe value for CCFL backlit displays.

BUG=none
BRANCH=none
TEST=none

Change-Id: I86445ab53cb83bc5183fb998ca03e00b4746a33f
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 8e079000dc
Original-Change-Id: I1c47b68eecc19624ee534598c22da183bc89425d
Original-Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Original-Reviewed-on: https://review.coreboot.org/18141
Original-Tested-by: build bot (Jenkins)
Original-Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://chromium-review.googlesource.com/457362
This commit is contained in:
Arthur Heymans 2017-01-14 22:31:54 +01:00 • committed by chrome-bot
commit 9905ad23e1
6 changed files with 91 additions and 10 deletions
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2
src/drivers/intel/gma/i915_reg.h
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@ -62,7 +62,7 @@
#define GCFGC 0xf0 /* 915+ only */
#define GC_LOW_FREQUENCY_ENABLE (1 << 7)
#define GC_DISPLAY_CLOCK_190_200_MHZ (0 << 4)
#define GC_DISPLAY_CLOCK_333_MHZ (4 << 4)
#define GC_DISPLAY_CLOCK_333_320_MHZ (4 << 4)
#define GC_DISPLAY_CLOCK_MASK (7 << 4)
#define GM45_GC_RENDER_CLOCK_MASK (0xf << 0)
#define GM45_GC_RENDER_CLOCK_266_MHZ (8 << 0)