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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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2
src/soc/intel/broadwell/lpc.c
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@ -260,6 +260,7 @@ static const struct reg_script pch_pm_init_script[] = {
REG_MMIO_WRITE32(RCBA_BASE_ADDRESS + 0x33b4, 0x00007001),
REG_MMIO_WRITE32(RCBA_BASE_ADDRESS + 0x3350, 0x022ddfff),
REG_MMIO_WRITE32(RCBA_BASE_ADDRESS + 0x3354, 0x00000001),
#if IS_ENABLED(CONFIG_BROADWELL_POWER_OPTIMIZER)
/* Power Optimizer */
REG_MMIO_OR32(RCBA_BASE_ADDRESS + 0x33d4, 0x08000000),
REG_MMIO_OR32(RCBA_BASE_ADDRESS + 0x33c8, 0x08000080),
@ -271,6 +272,7 @@ static const struct reg_script pch_pm_init_script[] = {
REG_MMIO_WRITE32(RCBA_BASE_ADDRESS + 0x3a84, 0x00001005),
REG_MMIO_OR32(RCBA_BASE_ADDRESS + 0x33d4, 0x2fff2fb1),
REG_MMIO_OR32(RCBA_BASE_ADDRESS + 0x33c8, 0x00008000),
#endif
REG_SCRIPT_END
};