From 46e5832014480ba70daf41a80489c0d11d431e08 Mon Sep 17 00:00:00 2001
From: Madhav Chauhan <madhav.chauhan@intel.com>
Date: Fri, 13 Oct 2017 18:14:59 +0530
Subject: [PATCH] drm/i915: Parse DSI backlight/cabc ports.
Git-commit: 46e5832014480ba70daf41a80489c0d11d431e08
Patch-mainline: v4.15-rc1
References: FATE#322643 bsc#1055900

This patch parse DSI backlight/cabc ports info from
VBT and save them inside local structure. This saved info
can be directly used while initializing DSI for different
platforms instead of parsing for each platform.

V2: Changes:    - Typo fix in commit message.    - Move up newly added port variables (Jani N)    - Remove redundant initialization (Jani N)    - Don't parse CABC ports if not supported (Jani N)
V3: Patch restructure (Suggested by Jani N)

Credits-to: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1507898700-20016-1-git-send-email-madhav.chauhan@intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/i915_drv.h   |    2 +
 drivers/gpu/drm/i915/intel_bios.c |   57 +++++++++++++++++++++++++++++++-------
 2 files changed, 49 insertions(+), 10 deletions(-)

--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1778,6 +1778,8 @@ struct intel_vbt_data {
 		u16 panel_id;
 		struct mipi_config *config;
 		struct mipi_pps_data *pps;
+		u16 bl_ports;
+		u16 cabc_ports;
 		u8 seq_version;
 		u32 size;
 		u8 *data;
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -691,6 +691,50 @@ parse_psr(struct drm_i915_private *dev_p
 	dev_priv->vbt.psr.tp2_tp3_wakeup_time = psr_table->tp2_tp3_wakeup_time;
 }
 
+static void parse_dsi_backlight_ports(struct drm_i915_private *dev_priv,
+				      u16 version, enum port port)
+{
+	if (!dev_priv->vbt.dsi.config->dual_link || version < 197) {
+		dev_priv->vbt.dsi.bl_ports = BIT(port);
+		if (dev_priv->vbt.dsi.config->cabc_supported)
+			dev_priv->vbt.dsi.cabc_ports = BIT(port);
+
+		dev_priv->vbt.dsi.config->dl_dcs_cabc_ports = 0;
+		dev_priv->vbt.dsi.config->dl_dcs_backlight_ports = 0;
+		return;
+	}
+
+	switch (dev_priv->vbt.dsi.config->dl_dcs_backlight_ports) {
+	case DL_DCS_PORT_A:
+		dev_priv->vbt.dsi.bl_ports = BIT(PORT_A);
+		break;
+	case DL_DCS_PORT_C:
+		dev_priv->vbt.dsi.bl_ports = BIT(PORT_C);
+		break;
+	default:
+	case DL_DCS_PORT_A_AND_C:
+		dev_priv->vbt.dsi.bl_ports = BIT(PORT_A) | BIT(PORT_C);
+		break;
+	}
+
+	if (!dev_priv->vbt.dsi.config->cabc_supported)
+		return;
+
+	switch (dev_priv->vbt.dsi.config->dl_dcs_cabc_ports) {
+	case DL_DCS_PORT_A:
+		dev_priv->vbt.dsi.cabc_ports = BIT(PORT_A);
+		break;
+	case DL_DCS_PORT_C:
+		dev_priv->vbt.dsi.cabc_ports = BIT(PORT_C);
+		break;
+	default:
+	case DL_DCS_PORT_A_AND_C:
+		dev_priv->vbt.dsi.cabc_ports =
+					BIT(PORT_A) | BIT(PORT_C);
+		break;
+	}
+}
+
 static void
 parse_mipi_config(struct drm_i915_private *dev_priv,
 		  const struct bdb_header *bdb)
@@ -699,9 +743,10 @@ parse_mipi_config(struct drm_i915_privat
 	const struct mipi_config *config;
 	const struct mipi_pps_data *pps;
 	int panel_type = dev_priv->vbt.panel_type;
+	enum port port;
 
 	/* parse MIPI blocks only if LFP type is MIPI */
-	if (!intel_bios_is_dsi_present(dev_priv, NULL))
+	if (!intel_bios_is_dsi_present(dev_priv, &port))
 		return;
 
 	/* Initialize this to undefined indicating no generic MIPI support */
@@ -742,15 +787,7 @@ parse_mipi_config(struct drm_i915_privat
 		return;
 	}
 
-	/*
-	 * These fields are introduced from the VBT version 197 onwards,
-	 * so making sure that these bits are set zero in the previous
-	 * versions.
-	 */
-	if (dev_priv->vbt.dsi.config->dual_link && bdb->version < 197) {
-		dev_priv->vbt.dsi.config->dl_dcs_cabc_ports = 0;
-		dev_priv->vbt.dsi.config->dl_dcs_backlight_ports = 0;
-	}
+	parse_dsi_backlight_ports(dev_priv, bdb->version, port);
 
 	/* We have mandatory mipi config blocks. Initialize as generic panel */
 	dev_priv->vbt.dsi.panel_id = MIPI_DSI_GENERIC_PANEL_ID;