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From 9f3557bfdc06fc87e50f39336fe24a4c599a5c5d Mon Sep 17 00:00:00 2001
From: Timothy Pearson <tpearson@raptorengineeringinc.com>
Date: Mon, 6 Apr 2015 22:01:23 -0500
Subject: [PATCH 02/22] northbridge/intel/gm45/gma: Add backlight control
register field
This allows the backlight control register to be set via devicetree.cb
Change-Id: I32b42dfc1cc609fb6f8995c6158c85be67633770
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
---
src/drivers/intel/gma/i915.h | 1 +
src/northbridge/intel/gm45/gma.c | 8 ++++++--
2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/src/drivers/intel/gma/i915.h b/src/drivers/intel/gma/i915.h
index 0d5b8af..36ac5fc 100644
--- a/src/drivers/intel/gma/i915.h
+++ b/src/drivers/intel/gma/i915.h
@@ -291,6 +291,7 @@ struct i915_gpu_controller_info
int lvds_dual_channel;
int link_frequency_270_mhz;
int lvds_num_lanes;
+ u32 backlight;
};
int i915lightup(unsigned int physbase, unsigned int mmio,
diff --git a/src/northbridge/intel/gm45/gma.c b/src/northbridge/intel/gm45/gma.c
index 4cf2776..b08422a 100644
--- a/src/northbridge/intel/gm45/gma.c
+++ b/src/northbridge/intel/gm45/gma.c
@@ -446,12 +446,13 @@ static void gma_func0_init(struct device *dev)
/* Init graphics power management */
gtt_res = find_resource(dev, PCI_BASE_ADDRESS_0);
+ struct northbridge_intel_gm45_config *conf = dev->chip_info;
+
#if !CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT
/* PCI Init, will run VBIOS */
pci_dev_init(dev);
#else
u32 physbase;
- struct northbridge_intel_gm45_config *conf = dev->chip_info;
struct resource *lfb_res;
struct resource *pio_res;
@@ -475,7 +476,10 @@ static void gma_func0_init(struct device *dev)
/* Post VBIOS init */
/* Enable Backlight */
gtt_write(BLC_PWM_CTL2, (1 << 31));
- gtt_write(BLC_PWM_CTL, 0x06100610);
+ if (conf->gfx.backlight == 0)
+ gtt_write(BLC_PWM_CTL, 0x06100610);
+ else
+ gtt_write(BLC_PWM_CTL, conf->gfx.backlight);
}
static void gma_set_subsystem(device_t dev, unsigned vendor, unsigned device)
--
1.9.1
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