[coreboot-gerrit] Change in coreboot[master]: soc/intel/braswell: add ACPI backlight support

[Matt DeVillier (Code Review)]

Matt DeVillier has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/39943 )

Change subject: soc/intel/braswell: add ACPI backlight support
......................................................................

soc/intel/braswell: add ACPI backlight support

Add framework 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: I0adccc6c8bee71d3c1b7840518308c8dc8ea2d81
Signed-off-by: Matt DeVillier 
---
M src/soc/intel/braswell/chip.h
M src/soc/intel/braswell/gfx.c
2 files changed, 23 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/43/39943/1

diff --git a/src/soc/intel/braswell/chip.h b/src/soc/intel/braswell/chip.h
index 026e491..5f1aaee 100644
--- a/src/soc/intel/braswell/chip.h
+++ b/src/soc/intel/braswell/chip.h
@@ -21,6 +21,7 @@
 #define _SOC_CHIP_H_

#include <stdint.h>
+#include <drivers/intel/gma/i915.h>
 #include <fsp/util.h>
 #include <intelblocks/lpc_lib.h>
 #include <soc/pci_devs.h>
@@ -169,6 +170,8 @@
    uint8_t  I2C4Frequency;
    uint8_t  I2C5Frequency;
    uint8_t  I2C6Frequency;
+
+	struct i915_gpu_controller_info gfx;
 };

#endif /* _SOC_CHIP_H_ */
diff --git a/src/soc/intel/braswell/gfx.c b/src/soc/intel/braswell/gfx.c
index ff73955..faef4c7 100644
--- a/src/soc/intel/braswell/gfx.c
+++ b/src/soc/intel/braswell/gfx.c
@@ -18,6 +18,7 @@
 #include <device/pci.h>
 #include <device/pci_ids.h>
 #include <drivers/intel/gma/opregion.h>
+#include <drivers/intel/gma/i915.h>
 #include <reg_script.h>
 #include <soc/gfx.h>
 #include <soc/nvs.h>
@@ -87,10 +88,29 @@
    	gnvs_ptr->aslb = aslb;
 }

+const struct i915_gpu_controller_info *
+intel_gma_get_controller_info(void)
+{
+	struct device *dev = pcidev_on_root(GFX_DEV, GFX_FUNC);
+	if (!dev || !dev->enabled)
+		return NULL;
+
+	struct soc_intel_braswell_config *chip = dev->chip_info;
+	return &chip->gfx;
+}
+
+static void gma_ssdt(struct device *dev)
+{
+	const struct i915_gpu_controller_info *gfx = intel_gma_get_controller_info();
+	if (gfx)
+		drivers_intel_gma_displays_ssdt_generate(gfx);
+}
+
 static struct device_operations gfx_device_ops = {
    .read_resources		= pci_dev_read_resources,
    .set_resources		= pci_dev_set_resources,
    .enable_resources	= pci_dev_enable_resources,
+	.acpi_fill_ssdt_generator = gma_ssdt,
    .init			= gfx_init,
    .ops_pci		= &soc_pci_ops,
 };