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soc/intel/baytrail: add ACPI backlight support 

Add hook to generate ACPI methods in SSDT for screen backlight control.

To make use of this, individual boards will need to
include default_brightness_levels.asl in their dsdt, as
well as add 'register "gfx" = "GMA_STATIC_DISPLAYS(0)"' to
their devicetree.

Change-Id: I0b7fc45bda3aaf89306bedb579fb1e9f8ce07926
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39942
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Matt DeVillier 2018-01-28 18:42:10 -06:00
parent a372f8ae86
commit c72f5f74a8
2 changed files with 11 additions and 0 deletions
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3
src/soc/intel/baytrail/chip.h
View File

@ -18,6 +18,7 @@
#ifndef _BAYTRAIL_CHIP_H_
#define _BAYTRAIL_CHIP_H_
#include <drivers/intel/gma/i915.h>
#include <stdint.h>
struct soc_intel_baytrail_config {
@ -84,6 +85,8 @@ struct soc_intel_baytrail_config {
uint16_t gpu_pipeb_power_cycle_delay;
int gpu_pipeb_pwm_freq_hz;
int disable_ddr_2x_refresh_rate;
struct i915_gpu_controller_info gfx;
};
#endif /* _BAYTRAIL_CHIP_H_ */

8
src/soc/intel/baytrail/gfx.c
View File

@ -397,6 +397,13 @@ static void gfx_init(struct device *dev)
intel_gma_restore_opregion();
}
static void gma_generate_ssdt(struct device *dev)
{
const struct soc_intel_baytrail_config *chip = dev->chip_info;
drivers_intel_gma_displays_ssdt_generate(&chip->gfx);
}
static unsigned long
gma_write_acpi_tables(struct device *const dev,
unsigned long current,
@ -430,6 +437,7 @@ static struct device_operations gfx_device_ops = {
.init = gfx_init,
.ops_pci = &soc_pci_ops,
.write_acpi_tables = gma_write_acpi_tables,
.acpi_fill_ssdt = gma_generate_ssdt,
};
static const struct pci_driver gfx_driver __pci_driver = {