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intel/lynxpoint,broadwell: Fix eDP display in Windows, SeaBios & Tiano

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Without this patch, eDP output is non-functional pre-graphics driver
regardless of payload (SeaBIOS, Tianocore) or video init method
(VBIOS, GOP driver) and once the standard Windows Intel HD graphics
driver is loaded.

Test: Boot Windows on peppy and auron_paine, install Intel HD
Graphics driver, observe functional eDP output with full video
acceleration.

Debugging method: adjust location of call to run VBIOS within
coreboot, observed that eDP output functional if the VBIOS is run
before the power optimizer lines, broken if run afterwards.

Change-Id: I6d8252e3de396887c84533e355f41693b9ea7514
Signed-off-by: Prabal Saha <coolstarorganization@gmail.com>
Reviewed-on: https://review.coreboot.org/15261
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Prabal Saha
2016-06-18 20:47:21 -07:00
committed by Martin Roth
parent 6e8233a60b
commit 0f2025da0f
4 changed files with 22 additions and 0 deletions
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9
src/southbridge/intel/lynxpoint/Kconfig
View File

@@ -96,4 +96,13 @@ config LOCK_MANAGEMENT_ENGINE
bool
default n
config LYNXPOINT_POWER_OPTIMIZER
bool "Enable Power Optimizer"
default y if CHROMEOS
help
Enable the power optimizer for the High Speed I/O
Power Control (HSIOPC). This can break graphics
under Windows, but can improve battery life under
'mostly idle' conditions.
endif

2
src/southbridge/intel/lynxpoint/lpc.c
View File

@@ -346,6 +346,7 @@ const struct rcba_config_instruction lpt_lp_pm_rcba[] = {
RCBA_RMW_REG_32(0x33b4, 0, 0x00007001),
RCBA_RMW_REG_32(0x3350, 0, 0x022ddfff),
RCBA_RMW_REG_32(0x3354, 0, 0x00000001),
#if IS_ENABLED(CONFIG_LYNXPOINT_POWER_OPTIMIZER)
RCBA_RMW_REG_32(0x33d4, ~0, 0x08000000), /* Power Optimizer */
RCBA_RMW_REG_32(0x33c8, ~0, 0x08000080), /* Power Optimizer */
RCBA_RMW_REG_32(0x2b10, 0, 0x0000883c), /* Power Optimizer */
@@ -353,6 +354,7 @@ const struct rcba_config_instruction lpt_lp_pm_rcba[] = {
RCBA_RMW_REG_32(0x2b24, 0, 0x40000005), /* Power Optimizer */
RCBA_RMW_REG_32(0x2b20, 0, 0x0005db01), /* Power Optimizer */
RCBA_RMW_REG_32(0x3a80, 0, 0x05145005),
#endif
RCBA_END_CONFIG
};