soc/intel/jasperlake: 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 google/magpie. Backlight controls
work on Windows 10 and Linux 6.1.

Change-Id: Iaa9872cd590c3b1298667cc80354ed3efd91c6c8
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74324
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sean Rhodes <sean@starlabs.systems>

src/soc/intel/jasperlake/Kconfig

@@ -219,4 +219,16 @@ config SOC_INTEL_JASPERLAKE_DEBUG_CONSENT
 config PRERAM_CBMEM_CONSOLE_SIZE
 	hex
 	default 0x1400
+
+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

src/soc/intel/jasperlake/Makefile.inc

@@ -32,6 +32,7 @@ ramstage-y += espi.c
 ramstage-y += finalize.c
 ramstage-y += fsp_params.c
 ramstage-y += gpio.c
+ramstage-y += graphics.c
 ramstage-y += lockdown.c
 ramstage-y += p2sb.c
 ramstage-y += pmc.c

src/soc/intel/jasperlake/chip.h

@@ -5,6 +5,7 @@
 
 #include <drivers/i2c/designware/dw_i2c.h>
 #include <gpio.h>
+#include <drivers/intel/gma/gma.h>
 #include <intelblocks/cfg.h>
 #include <intelblocks/gspi.h>
 #include <intelblocks/pcie_rp.h>
@@ -431,6 +432,9 @@ struct soc_intel_jasperlake_config {
 	 * false: Disabled (more wakes, higher power)
 	 */
 	bool cnvi_reduce_s0ix_pwr_usage;
+
+	/* i915 struct for GMA backlight control */
+	struct i915_gpu_controller_info gfx;
 };
 
 typedef struct soc_intel_jasperlake_config config_t;

src/soc/intel/jasperlake/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_jasperlake_config *const chip = dev->chip_info;
+	return &chip->gfx;
+}