soc/intel/mtl: Hook up GMA ACPI brightness controls

Add function needed to generate ACPI backlight control SSDT, along with
Kconfig values for accessing the registers.

Change-Id: Ied08e5e9fe4913bd60474ed7dcf88b945172558d
Signed-off-by: Jeremy Soller <jeremy@sysetm76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/soc/intel/meteorlake/Kconfig

@@ -402,6 +402,18 @@ config BUILDING_WITH_DEBUG_FSP
 	help
 	  Set this option if debug build of FSP is used.
 
+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
+
 config DROP_CPU_FEATURE_PROGRAM_IN_FSP
 	bool
 	default y if MP_SERVICES_PPI_V2_NOOP || CHROMEOS

src/soc/intel/meteorlake/Makefile.mk

@@ -37,6 +37,7 @@ ramstage-y += elog.c
 ramstage-y += espi.c
 ramstage-y += finalize.c
 ramstage-y += fsp_params.c
+ramstage-y += graphics.c
 ramstage-y += lockdown.c
 ramstage-y += p2sb.c
 ramstage-y += pcie_rp.c

src/soc/intel/meteorlake/chip.h

@@ -4,6 +4,7 @@
 #define _SOC_CHIP_H_
 
 #include <drivers/i2c/designware/dw_i2c.h>
+#include <drivers/intel/gma/gma.h>
 #include <device/pci_ids.h>
 #include <gpio.h>
 #include <intelblocks/cfg.h>
@@ -527,6 +528,9 @@ struct soc_intel_meteorlake_config {
 	 * as per `enum slew_rate` data type.
 	 */
 	uint8_t slow_slew_rate_config[NUM_VR_DOMAINS];
+
+	/* i915 struct for GMA backlight control */
+	struct i915_gpu_controller_info gfx;
 };
 
 typedef struct soc_intel_meteorlake_config config_t;

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

src/soc/intel/meteorlake/romstage/fsp_params.c

@@ -282,8 +282,6 @@ static void fill_fspm_misc_params(FSP_M_CONFIG *m_cfg,
 static void fill_fspm_audio_params(FSP_M_CONFIG *m_cfg,
 		const struct soc_intel_meteorlake_config *config)
 {
-	const struct device *dev;
-
 	/* Audio: HDAUDIO_LINK_MODE I2S/SNDW */
 	m_cfg->PchHdaEnable = is_devfn_enabled(PCI_DEVFN_HDA);
 	m_cfg->PchHdaDspEnable = config->pch_hda_dsp_enable;
@@ -304,13 +302,6 @@ static void fill_fspm_audio_params(FSP_M_CONFIG *m_cfg,
 	memset(m_cfg->PchHdaAudioLinkDmicEnable, 0, sizeof(m_cfg->PchHdaAudioLinkDmicEnable));
 	memset(m_cfg->PchHdaAudioLinkSspEnable, 0, sizeof(m_cfg->PchHdaAudioLinkSspEnable));
 	memset(m_cfg->PchHdaAudioLinkSndwEnable, 0, sizeof(m_cfg->PchHdaAudioLinkSndwEnable));
-
-	dev = pcidev_path_on_root(PCI_DEVFN_HDA);
-	if (dev) {
-		uint16_t svid = CONFIG_SUBSYSTEM_VENDOR_ID ? : (dev->subsystem_vendor ? : 0x8086);
-		uint16_t ssid = CONFIG_SUBSYSTEM_DEVICE_ID ? : (dev->subsystem_device ? : 0x7e28);
-		m_cfg->PchHdaSubSystemIds = (ssid << 16) | svid;
-	}
 }
 
 static void fill_fspm_cnvi_params(FSP_M_CONFIG *m_cfg,