From: Jesse Barnes <jbarnes@jbarnes-t61.(none)>
Date: Sat, 24 May 2008 01:42:47 +0000 (-0700)
Subject: i915: do a better job of parsing VBIOS data
X-Git-Tag: libdrm-2.4.3~16^2~179
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9fc4ea5c00dfb91ebff893fb5092e768155cc2e2;p=platform%2Fupstream%2Flibdrm.git

i915: do a better job of parsing VBIOS data

Add code to get panel modes from the VBIOS if present and check whether certain
outputs exist.  Should make our display detection code a little more robust.
---

diff --git a/linux-core/i915_drv.c b/linux-core/i915_drv.c
index 27c239d..51262d7 100644
--- a/linux-core/i915_drv.c
+++ b/linux-core/i915_drv.c
@@ -387,7 +387,7 @@ static int i915_suspend(struct drm_device *dev, pm_message_t state)
 
 	/* Scratch space */
 	for (i = 0; i < 16; i++) {
-		dev_priv->saveSWF0[i] = I915_READ(SWF0 + (i << 2));
+		dev_priv->saveSWF0[i] = I915_READ(SWF00 + (i << 2));
 		dev_priv->saveSWF1[i] = I915_READ(SWF10 + (i << 2));
 	}
 	for (i = 0; i < 3; i++)
@@ -551,7 +551,7 @@ static int i915_resume(struct drm_device *dev)
 	I915_WRITE (MI_ARB_STATE, dev_priv->saveMI_ARB_STATE | 0xffff0000);
 
 	for (i = 0; i < 16; i++) {
-		I915_WRITE(SWF0 + (i << 2), dev_priv->saveSWF0[i]);
+		I915_WRITE(SWF00 + (i << 2), dev_priv->saveSWF0[i]);
 		I915_WRITE(SWF10 + (i << 2), dev_priv->saveSWF1[i+7]);
 	}
 	for (i = 0; i < 3; i++)
diff --git a/linux-core/intel_bios.c b/linux-core/intel_bios.c
index 7f8e851..f124fa1 100644
--- a/linux-core/intel_bios.c
+++ b/linux-core/intel_bios.c
@@ -30,170 +30,7 @@
 #include "i915_drv.h"
 #include "intel_bios.h"
 
-#define VBT_OFFSET 0x1a
-
-/**
- * intel_find_vbt - find the VBT
- * @dev: DRM device
- *
- * Loads the Video BIOS and checks that the VBT exists.
- *
- * VBT existence is a sanity check that is relied on by other i830_bios.c code.
- * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
- * feed an updated VBT back through that, compared to what we'll fetch using
- * this method of groping around in the BIOS data.
- *
- * Returns 0 on success, nonzero on failure.
- */
-bool
-intel_find_bios(struct drm_device *dev)
-{
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct pci_dev *pdev = dev->pdev;
-	void __iomem *bios;
-	size_t size;
-
-	bios = pci_map_rom(pdev, &size);
-	if (!bios)
-		return NULL;
-
-	dev_priv->vbt = (struct vbt_header *)((u8 *)bios + VBT_OFFSET);
-	dev_priv->bdb = (struct bdb_header *)((u8 *)bios + VBT_OFFSET + 
-					      dev_priv->vbt->bdb_offset);
-	
-	if (memcmp(dev_priv->vbt->signature, "$VBT", 4) != 0) {
-		DRM_ERROR("Bad VBT signature\n");
-		pci_unmap_rom(pdev, bios);
-		return NULL;
-	}
-
-	return bios;
-}
-
 #if 0
-/**
- * Returns the BIOS's fixed panel mode.
- *
- * Note that many BIOSes will have the appropriate tables for a panel even when
- * a panel is not attached.  Additionally, many BIOSes adjust table sizes or
- * offsets, such that this parsing fails.  Thus, almost any other method for
- * detecting the panel mode is preferable.
- */
-struct drm_display_mode *
-i830_bios_get_panel_mode(struct drm_device *dev, bool *wants_dither)
-{
-    I830Ptr pI830 = I830PTR(pScrn);
-    struct vbt_header *vbt;
-    struct bdb_header *bdb;
-    int vbt_off, bdb_off, bdb_block_off, block_size;
-    int panel_type = -1;
-    unsigned char *bios;
-
-    bios = i830_bios_get (pScrn);
-
-    if (bios == NULL)
-	return NULL;
-
-    vbt_off = INTEL_BIOS_16(0x1a);
-    vbt = (struct vbt_header *)(bios + vbt_off);
-    bdb_off = vbt_off + vbt->bdb_offset;
-    bdb = (struct bdb_header *)(bios + bdb_off);
-
-    if (memcmp(bdb->signature, "BIOS_DATA_BLOCK ", 16) != 0) {
-	xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Bad BDB signature\n");
-	xfree(bios);
-	return NULL;
-    }
-
-    *wants_dither = FALSE;
-    for (bdb_block_off = bdb->header_size; bdb_block_off < bdb->bdb_size;
-	 bdb_block_off += block_size)
-    {
-	int start = bdb_off + bdb_block_off;
-	int id;
-	struct lvds_bdb_1 *lvds1;
-	struct lvds_bdb_2 *lvds2;
-	struct lvds_bdb_2_fp_params *fpparam;
-	struct lvds_bdb_2_fp_edid_dtd *fptiming;
-	DisplayModePtr fixed_mode;
-	CARD8 *timing_ptr;
-
-	id = INTEL_BIOS_8(start);
-	block_size = INTEL_BIOS_16(start + 1) + 3;
-	switch (id) {
-	case 40:
-	    lvds1 = (struct lvds_bdb_1 *)(bios + start);
-	    panel_type = lvds1->panel_type;
-	    if (lvds1->caps & LVDS_CAP_DITHER)
-		*wants_dither = TRUE;
-	    break;
-	case 41:
-	    if (panel_type == -1)
-		break;
-
-	    lvds2 = (struct lvds_bdb_2 *)(bios + start);
-	    fpparam = (struct lvds_bdb_2_fp_params *)(bios +
-		bdb_off + lvds2->panels[panel_type].fp_params_offset);
-	    fptiming = (struct lvds_bdb_2_fp_edid_dtd *)(bios +
-		bdb_off + lvds2->panels[panel_type].fp_edid_dtd_offset);
-	    timing_ptr = bios + bdb_off +
-	        lvds2->panels[panel_type].fp_edid_dtd_offset;
-
-	    if (fpparam->terminator != 0xffff) {
-		/* Apparently the offsets are wrong for some BIOSes, so we
-		 * try the other offsets if we find a bad terminator.
-		 */
-		fpparam = (struct lvds_bdb_2_fp_params *)(bios +
-		    bdb_off + lvds2->panels[panel_type].fp_params_offset + 8);
-		fptiming = (struct lvds_bdb_2_fp_edid_dtd *)(bios +
-		    bdb_off + lvds2->panels[panel_type].fp_edid_dtd_offset + 8);
-		timing_ptr = bios + bdb_off +
-	            lvds2->panels[panel_type].fp_edid_dtd_offset + 8;
-
-		if (fpparam->terminator != 0xffff)
-		    continue;
-	    }
-
-	    fixed_mode = xnfalloc(sizeof(DisplayModeRec));
-	    memset(fixed_mode, 0, sizeof(*fixed_mode));
-
-	    /* Since lvds_bdb_2_fp_edid_dtd is just an EDID detailed timing
-	     * block, pull the contents out using EDID macros.
-	     */
-	    fixed_mode->HDisplay   = _H_ACTIVE(timing_ptr);
-	    fixed_mode->VDisplay   = _V_ACTIVE(timing_ptr);
-	    fixed_mode->HSyncStart = fixed_mode->HDisplay +
-		_H_SYNC_OFF(timing_ptr);
-	    fixed_mode->HSyncEnd   = fixed_mode->HSyncStart +
-		_H_SYNC_WIDTH(timing_ptr);
-	    fixed_mode->HTotal     = fixed_mode->HDisplay +
-	        _H_BLANK(timing_ptr);
-	    fixed_mode->VSyncStart = fixed_mode->VDisplay +
-		_V_SYNC_OFF(timing_ptr);
-	    fixed_mode->VSyncEnd   = fixed_mode->VSyncStart +
-		_V_SYNC_WIDTH(timing_ptr);
-	    fixed_mode->VTotal     = fixed_mode->VDisplay +
-	        _V_BLANK(timing_ptr);
-	    fixed_mode->Clock      = _PIXEL_CLOCK(timing_ptr) / 1000;
-	    fixed_mode->type       = M_T_PREFERRED;
-
-	    xf86SetModeDefaultName(fixed_mode);
-
-	    if (pI830->debug_modes) {
-		xf86DrvMsg(pScrn->scrnIndex, X_INFO,
-			   "Found panel mode in BIOS VBT tables:\n");
-		xf86PrintModeline(pScrn->scrnIndex, fixed_mode);
-	    }
-
-	    xfree(bios);
-	    return fixed_mode;
-	}
-    }
-
-    xfree(bios);
-    return NULL;
-}
-
 unsigned char *
 i830_bios_get_aim_data_block (ScrnInfoPtr pScrn, int aim, int data_block)
 {
@@ -242,3 +79,162 @@ i830_bios_get_aim_data_block (ScrnInfoPtr pScrn, int aim, int data_block)
     return NULL;
 }
 #endif
+
+static void *
+find_section(struct bdb_header *bdb, int section_id)
+{
+	u8 *base = (u8 *)bdb;
+	int index = 0;
+	u16 total, current_size;
+	u8 current_id;
+
+	/* skip to first section */
+	index += bdb->header_size;
+	total = bdb->bdb_size;
+
+	/* walk the sections looking for section_id */
+	while (index < total) {
+		current_id = *(base + index);
+		index++;
+		current_size = *((u16 *)(base + index));
+		index += 2;
+		if (current_id == section_id)
+			return base + index;
+		index += current_size;
+	}
+
+	return NULL;
+}
+
+/* Try to find panel data */
+static void
+parse_panel_data(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
+{
+	struct bdb_lvds_options *lvds_options;
+	struct bdb_lvds_lfp_data *lvds_lfp_data;
+	struct bdb_lvds_lfp_data_entry *entry;
+	struct lvds_dvo_timing *dvo_timing;
+	struct drm_display_mode *panel_fixed_mode;
+
+	/* Defaults if we can't find VBT info */
+	dev_priv->lvds_dither = 0;
+	dev_priv->lvds_vbt = 0;
+
+	lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
+	if (!lvds_options)
+		return;
+
+	dev_priv->lvds_dither = lvds_options->pixel_dither;
+	if (lvds_options->panel_type == 0xff)
+		return;
+
+	lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
+	if (!lvds_lfp_data)
+		return;
+
+	dev_priv->lvds_vbt = 1;
+
+	entry = &lvds_lfp_data->data[lvds_options->panel_type];
+	dvo_timing = &entry->dvo_timing;
+
+	panel_fixed_mode = drm_calloc(1, sizeof(*panel_fixed_mode),
+				      DRM_MEM_DRIVER);
+
+	panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
+		dvo_timing->hactive_lo;
+	panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
+		((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
+	panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
+		dvo_timing->hsync_pulse_width;
+	panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
+		((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
+
+	panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
+		dvo_timing->vactive_lo;
+	panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
+		dvo_timing->vsync_off;
+	panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
+		dvo_timing->vsync_pulse_width;
+	panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
+		((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
+	panel_fixed_mode->clock = dvo_timing->clock * 10;
+	panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
+
+	drm_mode_set_name(panel_fixed_mode);
+
+	dev_priv->vbt_mode = panel_fixed_mode;
+
+	DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
+	drm_mode_debug_printmodeline(panel_fixed_mode);
+
+	return;
+}
+
+static void
+parse_general_features(struct drm_i915_private *dev_priv,
+		       struct bdb_header *bdb)
+{
+	struct bdb_general_features *general;
+
+	/* Set sensible defaults in case we can't find the general block */
+	dev_priv->int_tv_support = 1;
+	dev_priv->int_crt_support = 1;
+
+	general = find_section(bdb, BDB_GENERAL_FEATURES);
+	if (general) {
+		dev_priv->int_tv_support = general->int_tv_support;
+		dev_priv->int_crt_support = general->int_crt_support;
+	}
+}
+
+/**
+ * intel_init_bios - initialize VBIOS settings & find VBT
+ * @dev: DRM device
+ *
+ * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
+ * to appropriate values.
+ *
+ * VBT existence is a sanity check that is relied on by other i830_bios.c code.
+ * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
+ * feed an updated VBT back through that, compared to what we'll fetch using
+ * this method of groping around in the BIOS data.
+ *
+ * Returns 0 on success, nonzero on failure.
+ */
+bool
+intel_init_bios(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct pci_dev *pdev = dev->pdev;
+	struct vbt_header *vbt = NULL;
+	struct bdb_header *bdb;
+	u8 __iomem *bios;
+	size_t size;
+	int i;
+
+	bios = pci_map_rom(pdev, &size);
+	if (!bios)
+		return -1;
+
+	/* Scour memory looking for the VBT signature */
+	for (i = 0; i + 4 < size; i++) {
+		if (!memcmp(bios + i, "$VBT", 4)) {
+			vbt = (struct vbt_header *)(bios + i);
+			break;
+		}
+	}
+
+	if (!vbt) {
+		DRM_ERROR("VBT signature missing\n");
+		pci_unmap_rom(pdev, bios);
+		return -1;
+	}
+
+	bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
+
+	/* Grab useful general definitions */
+	parse_general_features(dev_priv, bdb);
+	parse_panel_data(dev_priv, bdb);
+
+	return 0;
+}
diff --git a/linux-core/intel_bios.h b/linux-core/intel_bios.h
index b17856d..5ea715a 100644
--- a/linux-core/intel_bios.h
+++ b/linux-core/intel_bios.h
@@ -46,6 +46,10 @@ struct bdb_header {
 	u16 version;			/**< decimal */
 	u16 header_size;		/**< in bytes */
 	u16 bdb_size;			/**< in bytes */
+};
+
+/* strictly speaking, this is a "skip" block, but it has interesting info */
+struct vbios_data {
 	u8 type; /* 0 == desktop, 1 == mobile */
 	u8 relstage;
 	u8 chipset;
@@ -58,48 +62,133 @@ struct bdb_header {
 	u16 code_segment;
 	u8 dos_boot_mode;
 	u8 bandwidth_percent;
-	u8 rsvd4;
+	u8 rsvd4; /* popup memory size */
 	u8 resize_pci_bios;
-	u8 rsvd5;
-	u8 rsvd6[3];
+	u8 rsvd5; /* is crt already on ddc2 */
+} __attribute__((packed));
+
+/*
+ * There are several types of BIOS data blocks (BDBs), each block has
+ * an ID and size in the first 3 bytes (ID in first, size in next 2).
+ * Known types are listed below.
+ */
+#define BDB_GENERAL_FEATURES	  1
+#define BDB_GENERAL_DEFINITIONS	  2
+#define BDB_OLD_TOGGLE_LIST	  3
+#define BDB_MODE_SUPPORT_LIST	  4
+#define BDB_GENERIC_MODE_TABLE	  5
+#define BDB_EXT_MMIO_REGS	  6
+#define BDB_SWF_IO		  7
+#define BDB_SWF_MMIO		  8
+#define BDB_DOT_CLOCK_TABLE	  9
+#define BDB_MODE_REMOVAL_TABLE	 10
+#define BDB_CHILD_DEVICE_TABLE	 11
+#define BDB_DRIVER_FEATURES	 12
+#define BDB_DRIVER_PERSISTENCE	 13
+#define BDB_EXT_TABLE_PTRS	 14
+#define BDB_DOT_CLOCK_OVERRIDE	 15
+#define BDB_DISPLAY_SELECT	 16
+/* 17 rsvd */
+#define BDB_DRIVER_ROTATION	 18
+#define BDB_DISPLAY_REMOVE	 19
+#define BDB_OEM_CUSTOM		 20
+#define BDB_EFP_LIST		 21 /* workarounds for VGA hsync/vsync */
+#define BDB_SDVO_LVDS_OPTIONS	 22
+#define BDB_SDVO_PANEL_DTDS	 23
+#define BDB_SDVO_LVDS_PNP_IDS	 24
+#define BDB_SDVO_LVDS_POWER_SEQ	 25
+#define BDB_TV_OPTIONS		 26
+#define BDB_LVDS_OPTIONS	 40
+#define BDB_LVDS_LFP_DATA_PTRS	 41
+#define BDB_LVDS_LFP_DATA	 42
+#define BDB_LVDS_BACKLIGHT	 43
+#define BDB_LVDS_POWER		 44
+#define BDB_SKIP		254 /* VBIOS private block, ignore */
+
+struct bdb_general_features {
+        /* bits 1 */
 	u8 panel_fitting:2;
 	u8 flexaim:1;
 	u8 msg_enable:1;
-	u8 clear_screen:1;
+	u8 clear_screen:3;
 	u8 color_flip:1;
-	u8 rsvd7:2; /* finish byte */
+
+        /* bits 2 */
 	u8 download_ext_vbt:1;
 	u8 enable_ssc:1;
 	u8 ssc_freq:1;
 	u8 enable_lfp_on_override:1;
 	u8 disable_ssc_ddt:1;
 	u8 rsvd8:3; /* finish byte */
+
+        /* bits 3 */
 	u8 disable_smooth_vision:1;
 	u8 single_dvi:1;
 	u8 rsvd9:6; /* finish byte */
-	u8 legacy_monitor_detect:1;
-	u8 rsvd10:7; /* finish byte */
+
+        /* bits 4 */
+	u8 legacy_monitor_detect;
+
+        /* bits 5 */
 	u8 int_crt_support:1;
 	u8 int_tv_support:1;
 	u8 rsvd11:6; /* finish byte */
 } __attribute__((packed));
 
-#define LVDS_CAP_EDID			(1 << 6)
-#define LVDS_CAP_DITHER			(1 << 5)
-#define LVDS_CAP_PFIT_AUTO_RATIO	(1 << 4)
-#define LVDS_CAP_PFIT_GRAPHICS_MODE	(1 << 3)
-#define LVDS_CAP_PFIT_TEXT_MODE		(1 << 2)
-#define LVDS_CAP_PFIT_GRAPHICS		(1 << 1)
-#define LVDS_CAP_PFIT_TEXT		(1 << 0)
-struct lvds_bdb_1 {
-	u8 id;				/**< 40 */
-	u16 size;
+struct bdb_general_definitions {
+	/* DDC GPIO */
+	u8 crt_ddc_gmbus_pin;
+
+	/* DPMS bits */
+	u8 dpms_acpi:1;
+	u8 skip_boot_crt_detect:1;
+	u8 dpms_aim:1;
+	u8 rsvd1:5; /* finish byte */
+
+	/* boot device bits */
+	u8 boot_display[2];
+	u8 child_dev_size;
+
+	/* device info */
+	u8 tv_or_lvds_info[33];
+	u8 dev1[33];
+	u8 dev2[33];
+	u8 dev3[33];
+	u8 dev4[33];
+	/* may be another device block here on some platforms */
+};
+
+struct bdb_lvds_options {
 	u8 panel_type;
-	u8 reserved0;
-	u16 caps;
+	u8 rsvd1;
+	/* LVDS capabilities, stored in a dword */
+	u8 rsvd2:1;
+	u8 lvds_edid:1;
+	u8 pixel_dither:1;
+	u8 pfit_ratio_auto:1;
+	u8 pfit_gfx_mode_enhanced:1;
+	u8 pfit_text_mode_enhanced:1;
+	u8 pfit_mode:2;
+	u8 rsvd4;
 } __attribute__((packed));
 
-struct lvds_bdb_2_fp_params {
+/* LFP pointer table contains entries to the struct below */
+struct bdb_lvds_lfp_data_ptr {
+	u16 fp_timing_offset; /* offsets are from start of bdb */
+	u8 fp_table_size;
+	u16 dvo_timing_offset;
+	u8 dvo_table_size;
+	u16 panel_pnp_id_offset;
+	u8 pnp_table_size;
+} __attribute__((packed));
+
+struct bdb_lvds_lfp_data_ptrs {
+	u8 lvds_entries; /* followed by one or more lvds_data_ptr structs */
+	struct bdb_lvds_lfp_data_ptr ptr[16];
+} __attribute__((packed));
+
+/* LFP data has 3 blocks per entry */
+struct lvds_fp_timing {
 	u16 x_res;
 	u16 y_res;
 	u32 lvds_reg;
@@ -115,42 +204,50 @@ struct lvds_bdb_2_fp_params {
 	u16 terminator;
 } __attribute__((packed));
 
-struct lvds_bdb_2_fp_edid_dtd {
-	u16 dclk;		/**< In 10khz */
-	u8 hactive;
-	u8 hblank;
-	u8 high_h;		/**< 7:4 = hactive 11:8, 3:0 = hblank 11:8 */
-	u8 vactive;
-	u8 vblank;
-	u8 high_v;		/**< 7:4 = vactive 11:8, 3:0 = vblank 11:8 */
-	u8 hsync_off;
+struct lvds_dvo_timing {
+	u16 clock;		/**< In 10khz */
+	u8 hactive_lo;
+	u8 hblank_lo;
+	u8 hblank_hi:4;
+	u8 hactive_hi:4;
+	u8 vactive_lo;
+	u8 vblank_lo;
+	u8 vblank_hi:4;
+	u8 vactive_hi:4;
+	u8 hsync_off_lo;
 	u8 hsync_pulse_width;
-	u8 vsync_off;
-	u8 high_hsync_off;	/**< 7:6 = hsync off 9:8 */
+	u8 vsync_pulse_width:4;
+	u8 vsync_off:4;
+	u8 rsvd0:6;
+	u8 hsync_off_hi:2;
 	u8 h_image;
 	u8 v_image;
 	u8 max_hv;
 	u8 h_border;
 	u8 v_border;
-	u8 flags;
-#define FP_EDID_FLAG_VSYNC_POSITIVE	(1 << 2)
-#define FP_EDID_FLAG_HSYNC_POSITIVE	(1 << 1)
+	u8 rsvd1:3;
+	u8 digital:2;
+	u8 vsync_positive:1;
+	u8 hsync_positive:1;
+	u8 rsvd2:1;
+} __attribute__((packed));
+
+struct lvds_pnp_id {
+	u16 mfg_name;
+	u16 product_code;
+	u32 serial;
+	u8 mfg_week;
+	u8 mfg_year;
 } __attribute__((packed));
 
-struct lvds_bdb_2_entry {
-	u16 fp_params_offset;		/**< From beginning of BDB */
-	u8 fp_params_size;
-	u16 fp_edid_dtd_offset;
-	u8 fp_edid_dtd_size;
-	u16 fp_edid_pid_offset;
-	u8 fp_edid_pid_size;
+struct bdb_lvds_lfp_data_entry {
+	struct lvds_fp_timing fp_timing;
+	struct lvds_dvo_timing dvo_timing;
+	struct lvds_pnp_id pnp_id;
 } __attribute__((packed));
 
-struct lvds_bdb_2 {
-	u8 id;			/**< 41 */
-	u16 size;
-	u8 table_size;	/* not sure on this one */
-	struct lvds_bdb_2_entry panels[16];
+struct bdb_lvds_lfp_data {
+	struct bdb_lvds_lfp_data_entry data[16];
 } __attribute__((packed));
 
 struct aimdb_header {
@@ -182,6 +279,127 @@ struct vch_bdb_22 {
 	struct vch_panel_data panels[16];
 } __attribute__((packed));
 
-bool intel_find_bios(struct drm_device *dev);
+bool intel_init_bios(struct drm_device *dev);
+
+/*
+ * Driver<->VBIOS interaction occurs through scratch bits in
+ * GR18 & SWF*.
+ */
+
+/* GR18 bits are set on display switch and hotkey events */
+#define GR18_DRIVER_SWITCH_EN	(1<<7) /* 0: VBIOS control, 1: driver control */
+#define GR18_HOTKEY_MASK	0x78 /* See also SWF4 15:0 */
+#define   GR18_HK_NONE		(0x0<<3)
+#define   GR18_HK_LFP_STRETCH	(0x1<<3)
+#define   GR18_HK_TOGGLE_DISP	(0x2<<3)
+#define   GR18_HK_DISP_SWITCH	(0x4<<3) /* see SWF14 15:0 for what to enable */
+#define   GR18_HK_POPUP_DISABLED (0x6<<3)
+#define   GR18_HK_POPUP_ENABLED	(0x7<<3)
+#define   GR18_HK_PFIT		(0x8<<3)
+#define   GR18_HK_APM_CHANGE	(0xa<<3)
+#define   GR18_HK_MULTIPLE	(0xc<<3)
+#define GR18_USER_INT_EN	(1<<2)
+#define GR18_A0000_FLUSH_EN	(1<<1)
+#define GR18_SMM_EN		(1<<0)
+
+/* Set by driver, cleared by VBIOS */
+#define SWF00_YRES_SHIFT	16
+#define SWF00_XRES_SHIFT	0
+#define SWF00_RES_MASK		0xffff
+
+/* Set by VBIOS at boot time and driver at runtime */
+#define SWF01_TV2_FORMAT_SHIFT	8
+#define SWF01_TV1_FORMAT_SHIFT	0
+#define SWF01_TV_FORMAT_MASK	0xffff
+
+#define SWF10_VBIOS_BLC_I2C_EN	(1<<29)
+#define SWF10_GTT_OVERRIDE_EN	(1<<28)
+#define SWF10_LFP_DPMS_OVR	(1<<27) /* override DPMS on display switch */
+#define SWF10_ACTIVE_TOGGLE_LIST_MASK (7<<24)
+#define   SWF10_OLD_TOGGLE	0x0
+#define   SWF10_TOGGLE_LIST_1	0x1
+#define   SWF10_TOGGLE_LIST_2	0x2
+#define   SWF10_TOGGLE_LIST_3	0x3
+#define   SWF10_TOGGLE_LIST_4	0x4
+#define SWF10_PANNING_EN	(1<<23)
+#define SWF10_DRIVER_LOADED	(1<<22)
+#define SWF10_EXTENDED_DESKTOP	(1<<21)
+#define SWF10_EXCLUSIVE_MODE	(1<<20)
+#define SWF10_OVERLAY_EN	(1<<19)
+#define SWF10_PLANEB_HOLDOFF	(1<<18)
+#define SWF10_PLANEA_HOLDOFF	(1<<17)
+#define SWF10_VGA_HOLDOFF	(1<<16)
+#define SWF10_ACTIVE_DISP_MASK	0xffff
+#define   SWF10_PIPEB_LFP2	(1<<15)
+#define   SWF10_PIPEB_EFP2	(1<<14)
+#define   SWF10_PIPEB_TV2	(1<<13)
+#define   SWF10_PIPEB_CRT2	(1<<12)
+#define   SWF10_PIPEB_LFP	(1<<11)
+#define   SWF10_PIPEB_EFP	(1<<10)
+#define   SWF10_PIPEB_TV	(1<<9)
+#define   SWF10_PIPEB_CRT	(1<<8)
+#define   SWF10_PIPEA_LFP2	(1<<7)
+#define   SWF10_PIPEA_EFP2	(1<<6)
+#define   SWF10_PIPEA_TV2	(1<<5)
+#define   SWF10_PIPEA_CRT2	(1<<4)
+#define   SWF10_PIPEA_LFP	(1<<3)
+#define   SWF10_PIPEA_EFP	(1<<2)
+#define   SWF10_PIPEA_TV	(1<<1)
+#define   SWF10_PIPEA_CRT	(1<<0)
+
+#define SWF11_MEMORY_SIZE_SHIFT	16
+#define SWF11_SV_TEST_EN	(1<<15)
+#define SWF11_IS_AGP		(1<<14)
+#define SWF11_DISPLAY_HOLDOFF	(1<<13)
+#define SWF11_DPMS_REDUCED	(1<<12)
+#define SWF11_IS_VBE_MODE	(1<<11)
+#define SWF11_PIPEB_ACCESS	(1<<10) /* 0 here means pipe a */
+#define SWF11_DPMS_MASK		0x07
+#define   SWF11_DPMS_OFF	(1<<2)
+#define   SWF11_DPMS_SUSPEND	(1<<1)
+#define   SWF11_DPMS_STANDBY	(1<<0)
+#define   SWF11_DPMS_ON		0
+
+#define SWF14_GFX_PFIT_EN	(1<<31)
+#define SWF14_TEXT_PFIT_EN	(1<<30)
+#define SWF14_LID_STATUS_CLOSED	(1<<29) /* 0 here means open */
+#define SWF14_POPUP_EN		(1<<28)
+#define SWF14_DISPLAY_HOLDOFF	(1<<27)
+#define SWF14_DISP_DETECT_EN	(1<<26)
+#define SWF14_DOCKING_STATUS_DOCKED (1<<25) /* 0 here means undocked */
+#define SWF14_DRIVER_STATUS	(1<<24)
+#define SWF14_OS_TYPE_WIN9X	(1<<23)
+#define SWF14_OS_TYPE_WINNT	(1<<22)
+/* 21:19 rsvd */
+#define SWF14_PM_TYPE_MASK	0x00070000
+#define   SWF14_PM_ACPI_VIDEO	(0x4 << 16)
+#define   SWF14_PM_ACPI		(0x3 << 16)
+#define   SWF14_PM_APM_12	(0x2 << 16)
+#define   SWF14_PM_APM_11	(0x1 << 16)
+#define SWF14_HK_REQUEST_MASK	0x0000ffff /* see GR18 6:3 for event type */
+          /* if GR18 indicates a display switch */
+#define   SWF14_DS_PIPEB_LFP2_EN (1<<15)
+#define   SWF14_DS_PIPEB_EFP2_EN (1<<14)
+#define   SWF14_DS_PIPEB_TV2_EN  (1<<13)
+#define   SWF14_DS_PIPEB_CRT2_EN (1<<12)
+#define   SWF14_DS_PIPEB_LFP_EN  (1<<11)
+#define   SWF14_DS_PIPEB_EFP_EN  (1<<10)
+#define   SWF14_DS_PIPEB_TV_EN   (1<<9)
+#define   SWF14_DS_PIPEB_CRT_EN  (1<<8)
+#define   SWF14_DS_PIPEA_LFP2_EN (1<<7)
+#define   SWF14_DS_PIPEA_EFP2_EN (1<<6)
+#define   SWF14_DS_PIPEA_TV2_EN  (1<<5)
+#define   SWF14_DS_PIPEA_CRT2_EN (1<<4)
+#define   SWF14_DS_PIPEA_LFP_EN  (1<<3)
+#define   SWF14_DS_PIPEA_EFP_EN  (1<<2)
+#define   SWF14_DS_PIPEA_TV_EN   (1<<1)
+#define   SWF14_DS_PIPEA_CRT_EN  (1<<0)
+          /* if GR18 indicates a panel fitting request */
+#define   SWF14_PFIT_EN		(1<<0) /* 0 means disable */
+          /* if GR18 indicates an APM change request */
+#define   SWF14_APM_HIBERNATE	0x4
+#define   SWF14_APM_SUSPEND	0x3
+#define   SWF14_APM_STANDBY	0x1
+#define   SWF14_APM_RESTORE	0x0
 
 #endif /* _I830_BIOS_H_ */
diff --git a/linux-core/intel_lvds.c b/linux-core/intel_lvds.c
index 1da95e1..6b6d316 100644
--- a/linux-core/intel_lvds.c
+++ b/linux-core/intel_lvds.c
@@ -380,6 +380,17 @@ void intel_lvds_init(struct drm_device *dev)
 	output->interlace_allowed = FALSE;
 	output->doublescan_allowed = FALSE;
 
+
+	/*
+	 * LVDS discovery:
+	 * 1) check for EDID on DDC
+	 * 2) check for VBT data
+	 * 3) check to see if LVDS is already on
+	 *    if none of the above, no panel
+	 * 4) make sure lid is open
+	 *    if closed, act like it's not there for now
+	 */
+
 	/* Set up the DDC bus. */
 	intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
 	if (!intel_output->ddc_bus) {
@@ -402,6 +413,11 @@ void intel_lvds_init(struct drm_device *dev)
 		}
 	}
 
+	/* Failed to get EDID, what about VBT? */
+	if (dev_priv->vbt_mode)
+		dev_priv->panel_fixed_mode =
+			drm_mode_duplicate(dev, dev_priv->vbt_mode);
+
 	/*
 	 * If we didn't get EDID, try checking if the panel is already turned
 	 * on.  If so, assume that whatever is currently programmed is the
@@ -424,38 +440,8 @@ void intel_lvds_init(struct drm_device *dev)
 	if (!dev_priv->panel_fixed_mode)
 		goto failed;
 
-	/* FIXME: probe the BIOS for modes and check for LVDS quirks */
 #if 0
-	/* Get the LVDS fixed mode out of the BIOS.  We should support LVDS
-	 * with the BIOS being unavailable or broken, but lack the
-	 * configuration options for now.
-	 */
-	bios_mode = intel_bios_get_panel_mode(pScrn);
-	if (bios_mode != NULL) {
-		if (dev_priv->panel_fixed_mode != NULL) {
-			if (dev_priv->debug_modes &&
-			    !xf86ModesEqual(dev_priv->panel_fixed_mode,
-					    bios_mode))
-			{
-				xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
-					   "BIOS panel mode data doesn't match probed data, "
-					   "continuing with probed.\n");
-				xf86DrvMsg(pScrn->scrnIndex, X_INFO, "BIOS mode:\n");
-				xf86PrintModeline(pScrn->scrnIndex, bios_mode);
-				xf86DrvMsg(pScrn->scrnIndex, X_INFO, "probed mode:\n");
-				xf86PrintModeline(pScrn->scrnIndex, dev_priv->panel_fixed_mode);
-				xfree(bios_mode->name);
-				xfree(bios_mode);
-			}
-		}  else {
-			dev_priv->panel_fixed_mode = bios_mode;
-		}
-	} else {
-		xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
-			   "Couldn't detect panel mode.  Disabling panel\n");
-		goto disable_exit;
-	}
-
+	/* FIXME: detect aopen & mac mini type stuff automatically? */
 	/*
 	 * Blacklist machines with BIOSes that list an LVDS panel without
 	 * actually having one.
diff --git a/linux-core/intel_tv.c b/linux-core/intel_tv.c
index 42f4b10..650c46f 100644
--- a/linux-core/intel_tv.c
+++ b/linux-core/intel_tv.c
@@ -1620,7 +1620,7 @@ intel_tv_init(struct drm_device *dev)
 		return;
 
 	/* Even if we have an encoder we may not have a connector */
-	if (!dev_priv->bdb->int_tv_support)
+	if (!dev_priv->int_tv_support)
 		return;
 
 	/*
diff --git a/shared-core/i915_drv.h b/shared-core/i915_drv.h
index 84cc60f..c5e22f7 100644
--- a/shared-core/i915_drv.h
+++ b/shared-core/i915_drv.h
@@ -174,14 +174,17 @@ struct drm_i915_private {
 	int backlight_duty_cycle;  /* restore backlight to this value */
 	bool panel_wants_dither;
 	struct drm_display_mode *panel_fixed_mode;
+	struct drm_display_mode *vbt_mode; /* if any */
 
 	/* DRI2 sarea */
 	struct drm_buffer_object *sarea_bo;
 	struct drm_bo_kmap_obj sarea_kmap;
 
-	/* BIOS data */
-	struct vbt_header *vbt;
-	struct bdb_header *bdb;
+	/* Feature bits from the VBIOS */
+	int int_tv_support:1;
+	int lvds_dither:1;
+	int lvds_vbt:1;
+	int int_crt_support:1;
 
 	/* Register state */
 	u8 saveLBB;
@@ -1680,15 +1683,16 @@ extern int i915_wait_ring(struct drm_device * dev, int n, const char *caller);
 #define DSPATILEOFF		0x701A4 /* 965+ only */
 
 /* VBIOS flags */
-#define SWF0			0x71410
-#define SWF1			0x71414
-#define SWF2			0x71418
-#define SWF3			0x7141c
-#define SWF4			0x71420
-#define SWF5			0x71424
-#define SWF6			0x71428
-
+#define SWF00			0x71410
+#define SWF01			0x71414
+#define SWF02			0x71418
+#define SWF03			0x7141c
+#define SWF04			0x71420
+#define SWF05			0x71424
+#define SWF06			0x71428
 #define SWF10			0x70410
+#define SWF11			0x70414
+#define SWF14			0x71420
 #define SWF30			0x72414
 #define SWF31			0x72418
 #define SWF32			0x7241c
diff --git a/shared-core/i915_init.c b/shared-core/i915_init.c
index f5fe5ba..bda15e0 100644
--- a/shared-core/i915_init.c
+++ b/shared-core/i915_init.c
@@ -224,9 +224,9 @@ int i915_load_modeset_init(struct drm_device *dev)
 		goto destroy_hws;
 	}
 
-	ret = intel_find_bios(dev);
+	ret = intel_init_bios(dev);
 	if (ret) {
-		DRM_ERROR("failed to find VBT\n");
+		DRM_ERROR("failed to find VBIOS tables\n");
 		ret = -ENODEV;
 		goto destroy_wq;
 	}