soc/intel/tigerlake: Hook up GMA ACPI brightness controls
Add function needed to generate ACPI backlight control SSDT, along with
Kconfig values for accessing the registers.
Tested by adding gfx register on system76/gaze16 and booting Windows.
Display settings has a brightness setting, and can change the brightness
level.
Change-Id: Id8b14c0b4a7a681dc6cb95778c12a006a7e31373
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57823
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/soc/intel/tigerlake/Kconfig b/src/soc/intel/tigerlake/Kconfig
index 83d2e9f..3739178 100644
--- a/src/soc/intel/tigerlake/Kconfig
+++ b/src/soc/intel/tigerlake/Kconfig
@@ -305,4 +305,16 @@
endif # SOC_INTEL_ENABLE_USB4_PCIE_RESOURCES
+config INTEL_GMA_BCLV_OFFSET
+ default 0xc8258
+
+config INTEL_GMA_BCLV_WIDTH
+ default 32
+
+config INTEL_GMA_BCLM_OFFSET
+ default 0xc8254
+
+config INTEL_GMA_BCLM_WIDTH
+ default 32
+
endif
diff --git a/src/soc/intel/tigerlake/Makefile.inc b/src/soc/intel/tigerlake/Makefile.inc
index 91464b3..bce3653 100644
--- a/src/soc/intel/tigerlake/Makefile.inc
+++ b/src/soc/intel/tigerlake/Makefile.inc
@@ -31,6 +31,7 @@
ramstage-y += espi.c
ramstage-y += finalize.c
ramstage-y += fsp_params.c
+ramstage-y += graphics.c
ramstage-y += lockdown.c
ramstage-y += lpm.c
ramstage-y += me.c
diff --git a/src/soc/intel/tigerlake/chip.h b/src/soc/intel/tigerlake/chip.h
index b63ff01..465dea2 100644
--- a/src/soc/intel/tigerlake/chip.h
+++ b/src/soc/intel/tigerlake/chip.h
@@ -4,6 +4,7 @@
#define _SOC_CHIP_H_
#include <drivers/i2c/designware/dw_i2c.h>
+#include <drivers/intel/gma/gma.h>
#include <intelblocks/cfg.h>
#include <intelblocks/gpio.h>
#include <intelblocks/gspi.h>
@@ -532,6 +533,9 @@
*
*/
bool external_bypass;
+
+ /* i915 struct for GMA backlight control */
+ struct i915_gpu_controller_info gfx;
};
typedef struct soc_intel_tigerlake_config config_t;
diff --git a/src/soc/intel/tigerlake/graphics.c b/src/soc/intel/tigerlake/graphics.c
new file mode 100644
index 0000000..1696d52
--- /dev/null
+++ b/src/soc/intel/tigerlake/graphics.c
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <intelblocks/graphics.h>
+#include <soc/ramstage.h>
+
+const struct i915_gpu_controller_info *
+intel_igd_get_controller_info(const struct device *const dev)
+{
+ const struct soc_intel_tigerlake_config *const chip = dev->chip_info;
+ return &chip->gfx;
+}