WebSVN – Kolibri OS – Diff – /drivers/video/drm/i915/intel_bios.c

+ *
  * Authors:
  *    Eric Anholt
+ *
  */
-#include
 #include
+#include
 #include
 #include "i915_drv.h"
 #include "intel_bios.h"
 	/* skip to first section */
 	index += bdb->header_size;
 	total = bdb->bdb_size;
 	/* walk the sections looking for section_id */
-	while (index < total) {
+	while (index + 3 < total) {
 		current_id = *(base + index);
+		index++;
 		index++;
 		current_size = *((u16 *)(base + index));
+		index += 2;
+		if (index + current_size > total)
+			return NULL;
 		index += 2;
 		if (current_id == section_id)
+			return base + index;
 			return base + index;
 		index += current_size;
+	}
 	const struct bdb_lvds_lfp_data *lvds_lfp_data;
 	const struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
 	const struct lvds_dvo_timing *panel_dvo_timing;
 	const struct lvds_fp_timing *fp_timing;
 	struct drm_display_mode *panel_fixed_mode;
-	int i, downclock;
+	int i, downclock, drrs_mode;
 	lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 	if (!lvds_options)
 	if (lvds_options->panel_type == 0xff)
 		return;
+	panel_type = lvds_options->panel_type;
+	drrs_mode = (lvds_options->dps_panel_type_bits
+				>> (panel_type * 2)) & MODE_MASK;
+	/*
+	 * VBT has static DRRS = 0 and seamless DRRS = 2.
+	 * The below piece of code is required to adjust vbt.drrs_type
+	 * to match the enum drrs_support_type.
+	 */
+	switch (drrs_mode) {
+	case 0:
+		dev_priv->vbt.drrs_type = STATIC_DRRS_SUPPORT;
+		DRM_DEBUG_KMS("DRRS supported mode is static\n");
+		break;
+	case 2:
+		dev_priv->vbt.drrs_type = SEAMLESS_DRRS_SUPPORT;
+		DRM_DEBUG_KMS("DRRS supported mode is seamless\n");
+		break;
+	default:
+		dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
+		DRM_DEBUG_KMS("DRRS not supported (VBT input)\n");
+		break;
 	panel_type = lvds_options->panel_type;
 	lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 	if (!lvds_lfp_data)
 		if (lvds_dvo_timing_equal_size(dvo_timing, panel_dvo_timing) &&
 		    dvo_timing->clock < downclock)
 			downclock = dvo_timing->clock;
+	}
-	if (downclock < panel_dvo_timing->clock && i915_lvds_downclock) {
+	if (downclock < panel_dvo_timing->clock && i915.lvds_downclock) {
 		dev_priv->lvds_downclock_avail = 1;
 		dev_priv->lvds_downclock = downclock * 10;
 		DRM_DEBUG_KMS("LVDS downclock is found in VBT. "
 			      "Normal Clock %dKHz, downclock %dKHz\n",
 		return;
+	}
+	entry = &backlight_data->data[panel_type];
+	dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
+	if (!dev_priv->vbt.backlight.present) {
+		DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
+			      entry->type);
+		return;
 	entry = &backlight_data->data[panel_type];
+	dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
-	dev_priv->vbt.backlight.pwm_freq_hz = entry->pwm_freq_hz;
+	dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
-	dev_priv->vbt.backlight.active_low_pwm = entry->active_low_pwm;
+	dev_priv->vbt.backlight.min_brightness = entry->min_brightness;
 	DRM_DEBUG_KMS("VBT backlight PWM modulation frequency %u Hz, "
 		      "active %s, min brightness %u, level %u\n",
 		      dev_priv->vbt.backlight.pwm_freq_hz,
 		      dev_priv->vbt.backlight.active_low_pwm ? "low" : "high",
-		      entry->min_brightness,
+		      dev_priv->vbt.backlight.min_brightness,
 		      backlight_data->level[panel_type]);
+}
+{
 	struct lvds_dvo_timing *dvo_timing;
 	struct drm_display_mode *panel_fixed_mode;
 	int index;
-	index = i915_vbt_sdvo_panel_type;
+	index = i915.vbt_sdvo_panel_type;
 	if (index == -2) {
 		DRM_DEBUG_KMS("Ignore SDVO panel mode from BIOS VBT tables.\n");
 		return;
 	if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
 		dev_priv->vbt.edp_support = 1;
 	if (driver->dual_frequency)
+		dev_priv->render_reclock_avail = true;
+	DRM_DEBUG_KMS("DRRS State Enabled:%d\n", driver->drrs_enabled);
+	/*
+	 * If DRRS is not supported, drrs_type has to be set to 0.
+	 * This is because, VBT is configured in such a way that
+	 * static DRRS is 0 and DRRS not supported is represented by
+	 * driver->drrs_enabled=false
+	 */
+	if (!driver->drrs_enabled)
-		dev_priv->render_reclock_avail = true;
+		dev_priv->vbt.drrs_type = DRRS_NOT_SUPPORTED;
+}
 static void
 	edp_pps = &edp->power_seqs[panel_type];
 	edp_link_params = &edp->link_params[panel_type];
+	dev_priv->vbt.edp_pps = *edp_pps;
-	dev_priv->vbt.edp_pps = *edp_pps;
+	switch (edp_link_params->rate) {
+	case EDP_RATE_1_62:
+		dev_priv->vbt.edp_rate = DP_LINK_BW_1_62;
+		break;
+	case EDP_RATE_2_7:
+		dev_priv->vbt.edp_rate = DP_LINK_BW_2_7;
+		break;
+	default:
+		DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
+			      edp_link_params->rate);
+		break;
 	dev_priv->vbt.edp_rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
-		DP_LINK_BW_1_62;
 	switch (edp_link_params->lanes) {
-	case 0:
+	case EDP_LANE_1:
 		dev_priv->vbt.edp_lanes = 1;
 		break;
-	case 1:
+	case EDP_LANE_2:
 		dev_priv->vbt.edp_lanes = 2;
-		break;
-	case 3:
+		break;
-	default:
+	case EDP_LANE_4:
+		dev_priv->vbt.edp_lanes = 4;
+		break;
+	default:
+		DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
-		dev_priv->vbt.edp_lanes = 4;
+			      edp_link_params->lanes);
+		break;
 		break;
-	}
 	switch (edp_link_params->preemphasis) {
-	case 0:
+	case EDP_PREEMPHASIS_NONE:
 		dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
 		break;
-	case 1:
+	case EDP_PREEMPHASIS_3_5dB:
 		dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
 		break;
-	case 2:
+	case EDP_PREEMPHASIS_6dB:
 		dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
 		break;
-	case 3:
+	case EDP_PREEMPHASIS_9_5dB:
+		dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
+		break;
+	default:
+		DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
-		dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
+			      edp_link_params->preemphasis);
+		break;
 		break;
-	}
 	switch (edp_link_params->vswing) {
-	case 0:
+	case EDP_VSWING_0_4V:
 		dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
 		break;
-	case 1:
+	case EDP_VSWING_0_6V:
 		dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
 		break;
-	case 2:
+	case EDP_VSWING_0_8V:
 		dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
 		break;
-	case 3:
+	case EDP_VSWING_1_2V:
+		dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
+		break;
+	default:
+		DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
-		dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
+			      edp_link_params->vswing);
 		break;
+	}
+}
+static u8 *goto_next_sequence(u8 *data, int *size)
+{
+	u16 len;
+	int tmp = *size;
+	if (--tmp < 0)
+		return NULL;
+	/* goto first element */
+	data++;
+	while (1) {
+		switch (*data) {
+		case MIPI_SEQ_ELEM_SEND_PKT:
+			/*
+			 * skip by this element payload size
+			 * skip elem id, command flag and data type
+			 */
+			tmp -= 5;
+			if (tmp < 0)
+				return NULL;
+			data += 3;
+			len = *((u16 *)data);
+			tmp -= len;
+			if (tmp < 0)
+				return NULL;
+			/* skip by len */
+			data = data + 2 + len;
+			break;
+		case MIPI_SEQ_ELEM_DELAY:
+			/* skip by elem id, and delay is 4 bytes */
+			tmp -= 5;
+			if (tmp < 0)
+				return NULL;
+			data += 5;
+			break;
+		case MIPI_SEQ_ELEM_GPIO:
+			tmp -= 3;
+			if (tmp < 0)
+				return NULL;
+			data += 3;
+			break;
+		default:
+			DRM_ERROR("Unknown element\n");
+			return NULL;
+		}
+		/* end of sequence ? */
+		if (*data == 0)
+			break;
+	}
+	/* goto next sequence or end of block byte */
+	if (--tmp < 0)
+		return NULL;
+	data++;
+	/* update amount of data left for the sequence block to be parsed */
+	*size = tmp;
 	return data;
+}
 static void
+parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
+{
+	struct bdb_mipi_config *start;
+	struct bdb_mipi_sequence *sequence;
+	struct mipi_config *config;
+	struct mipi_pps_data *pps;
-parse_mipi(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
+	u8 *data, *seq_data;
-{
+	int i, panel_id, seq_size;
-	struct bdb_mipi *mipi;
 	u16 block_size;
+	/* parse MIPI blocks only if LFP type is MIPI */
+	if (!dev_priv->vbt.has_mipi)
+		return;
+	/* Initialize this to undefined indicating no generic MIPI support */
+	dev_priv->vbt.dsi.panel_id = MIPI_DSI_UNDEFINED_PANEL_ID;
+	/* Block #40 is already parsed and panel_fixed_mode is
+	 * stored in dev_priv->lfp_lvds_vbt_mode
+	 * resuse this when needed
+	 */
+	/* Parse #52 for panel index used from panel_type already
+	 * parsed
+	 */
+	start = find_section(bdb, BDB_MIPI_CONFIG);
+	if (!start) {
+		DRM_DEBUG_KMS("No MIPI config BDB found");
+		return;
+	}
+	DRM_DEBUG_DRIVER("Found MIPI Config block, panel index = %d\n",
+								panel_type);
+	/*
+	 * get hold of the correct configuration block and pps data as per
+	 * the panel_type as index
+	 */
+	config = &start->config[panel_type];
+	pps = &start->pps[panel_type];
+	/* store as of now full data. Trim when we realise all is not needed */
+	dev_priv->vbt.dsi.config = kmemdup(config, sizeof(struct mipi_config), GFP_KERNEL);
+	if (!dev_priv->vbt.dsi.config)
+		return;
+	dev_priv->vbt.dsi.pps = kmemdup(pps, sizeof(struct mipi_pps_data), GFP_KERNEL);
+	if (!dev_priv->vbt.dsi.pps) {
+		kfree(dev_priv->vbt.dsi.config);
+		return;
+	}
+	/* We have mandatory mipi config blocks. Initialize as generic panel */
+	dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;
+	/* Check if we have sequence block as well */
+	sequence = find_section(bdb, BDB_MIPI_SEQUENCE);
+	if (!sequence) {
+		DRM_DEBUG_KMS("No MIPI Sequence found, parsing complete\n");
+		return;
+	}
+	DRM_DEBUG_DRIVER("Found MIPI sequence block\n");
+	block_size = get_blocksize(sequence);
+	/*
+	 * parse the sequence block for individual sequences
+	 */
+	dev_priv->vbt.dsi.seq_version = sequence->version;
+	seq_data = &sequence->data[0];
+	/*
+	 * sequence block is variable length and hence we need to parse and
+	 * get the sequence data for specific panel id
+	 */
+	for (i = 0; i < MAX_MIPI_CONFIGURATIONS; i++) {
+		panel_id = *seq_data;
+		seq_size = *((u16 *) (seq_data + 1));
+		if (panel_id == panel_type)
+			break;
+		/* skip the sequence including seq header of 3 bytes */
+		seq_data = seq_data + 3 + seq_size;
+		if ((seq_data - &sequence->data[0]) > block_size) {
+			DRM_ERROR("Sequence start is beyond sequence block size, corrupted sequence block\n");
+			return;
+		}
+	}
+	if (i == MAX_MIPI_CONFIGURATIONS) {
+		DRM_ERROR("Sequence block detected but no valid configuration\n");
+		return;
+	}
+	/* check if found sequence is completely within the sequence block
+	 * just being paranoid */
+	if (seq_size > block_size) {
+		DRM_ERROR("Corrupted sequence/size, bailing out\n");
+		return;
+	}
+	/* skip the panel id(1 byte) and seq size(2 bytes) */
+	dev_priv->vbt.dsi.data = kmemdup(seq_data + 3, seq_size, GFP_KERNEL);
+	if (!dev_priv->vbt.dsi.data)
+		return;
+	/*
+	 * loop into the sequence data and split into multiple sequneces
+	 * There are only 5 types of sequences as of now
+	 */
+	data = dev_priv->vbt.dsi.data;
+	dev_priv->vbt.dsi.size = seq_size;
+	/* two consecutive 0x00 indicate end of all sequences */
+	while (1) {
+		int seq_id = *data;
+		if (MIPI_SEQ_MAX > seq_id && seq_id > MIPI_SEQ_UNDEFINED) {
+			dev_priv->vbt.dsi.sequence[seq_id] = data;
+			DRM_DEBUG_DRIVER("Found mipi sequence - %d\n", seq_id);
+		} else {
+			DRM_ERROR("undefined sequence\n");
+			goto err;
+		}
+		/* partial parsing to skip elements */
+		data = goto_next_sequence(data, &seq_size);
+		if (data == NULL) {
+			DRM_ERROR("Sequence elements going beyond block itself. Sequence block parsing failed\n");
+			goto err;
 	mipi = find_section(bdb, BDB_MIPI);
+		if (*data == 0)
+			break; /* end of sequence reached */
+	}
+	DRM_DEBUG_DRIVER("MIPI related vbt parsing complete\n");
+	return;
-	if (!mipi) {
+err:
-		DRM_DEBUG_KMS("No MIPI BDB found");
+	kfree(dev_priv->vbt.dsi.data);
-		return;
+	dev_priv->vbt.dsi.data = NULL;
 	/* error during parsing so set all pointers to null
-	/* XXX: add more info */
+	 * because of partial parsing */
 		p_child = &(p_defs->devices[i]);
 		if (!p_child->common.device_type) {
 			/* skip the device block if device type is invalid */
 			continue;
+		}
+		if (p_child->common.dvo_port >= DVO_PORT_MIPIA
+		    && p_child->common.dvo_port <= DVO_PORT_MIPID
+		    &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) {
+			DRM_DEBUG_KMS("Found MIPI as LFP\n");
+			dev_priv->vbt.has_mipi = 1;
+			dev_priv->vbt.dsi.port = p_child->common.dvo_port;
+		}
 		child_dev_ptr = dev_priv->vbt.child_dev + count;
 		count++;
 		memcpy((void *)child_dev_ptr, (void *)p_child,
 					sizeof(*p_child));
+	}
 	struct drm_device *dev = dev_priv->dev;
 	enum port port;
+	dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
+	/* Default to having backlight */
-	dev_priv->vbt.crt_ddc_pin = GMBUS_PORT_VGADDC;
+	dev_priv->vbt.backlight.present = true;
 	/* LFP panel data */
 	dev_priv->vbt.lvds_dither = 1;
 		info->supports_hdmi = info->supports_dvi;
 		info->supports_dp = (port != PORT_E);
+	}
+}
+static struct bdb_header *validate_vbt(char *base, size_t size,
+				       struct vbt_header *vbt,
+				       const char *source)
+{
+	size_t offset;
+	struct bdb_header *bdb;
+	if (vbt == NULL) {
+		DRM_DEBUG_DRIVER("VBT signature missing\n");
+		return NULL;
+	}
+	offset = (char *)vbt - base;
+	if (offset + sizeof(struct vbt_header) > size) {
+		DRM_DEBUG_DRIVER("VBT header incomplete\n");
+		return NULL;
+	}
+	if (memcmp(vbt->signature, "$VBT", 4)) {
+		DRM_DEBUG_DRIVER("VBT invalid signature\n");
+		return NULL;
+	}
+	offset += vbt->bdb_offset;
+	if (offset + sizeof(struct bdb_header) > size) {
+		DRM_DEBUG_DRIVER("BDB header incomplete\n");
+		return NULL;
+	}
+	bdb = (struct bdb_header *)(base + offset);
+	if (offset + bdb->bdb_size > size) {
+		DRM_DEBUG_DRIVER("BDB incomplete\n");
+		return NULL;
+	}
+	DRM_DEBUG_KMS("Using VBT from %s: %20s\n",
+		      source, vbt->signature);
+	return bdb;
+}
 /**
  * intel_parse_bios - find VBT and initialize settings from the BIOS
 		return -ENODEV;
 	init_vbt_defaults(dev_priv);
 	/* XXX Should this validation be moved to intel_opregion.c? */
-	if (dev_priv->opregion.vbt) {
-		struct vbt_header *vbt = dev_priv->opregion.vbt;
-		if (memcmp(vbt->signature, "$VBT", 4) == 0) {
-			DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
+	if (dev_priv->opregion.vbt)
-					 vbt->signature);
-			bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
+		bdb = validate_vbt((char *)dev_priv->opregion.header, OPREGION_SIZE,
-		} else
-			dev_priv->opregion.vbt = NULL;
+				   (struct vbt_header *)dev_priv->opregion.vbt,
-	}
+				   "OpRegion");
-	if (bdb == NULL) {
 		struct vbt_header *vbt = NULL;
-		size_t size;
+	if (bdb == NULL) {
-		int i;
+		size_t i, size;
 		bios = pci_map_rom(pdev, &size);
 		if (!bios)
+			return -1;
-			return -1;
+		/* Scour memory looking for the VBT signature */
 		for (i = 0; i + 4 < size; i++) {
-		/* Scour memory looking for the VBT signature */
+			if (memcmp(bios + i, "$VBT", 4) == 0) {
-		for (i = 0; i + 4 < size; i++) {
+				bdb = validate_vbt(bios, size,
-			if (!memcmp(bios + i, "$VBT", 4)) {
+						   (struct vbt_header *)(bios + i),
-				vbt = (struct vbt_header *)(bios + i);
-				break;
+						   "PCI ROM");
 				break;
+			}
-		if (!vbt) {
 			DRM_DEBUG_DRIVER("VBT signature missing\n");
 			pci_unmap_rom(pdev, bios);
-			return -1;
+		if (!bdb) {
 			pci_unmap_rom(pdev, bios);

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(root)/drivers/video/drm/i915/intel_bios.c – Rev 4560 → 5060