From 03f8208ab0a3ea77a8b30dd1c3fe2b62892f9d8c Mon Sep 17 00:00:00 2001
From: Maarten Maathuis <madman2003@gmail.com>
Date: Mon, 21 Jul 2008 14:50:07 +0200
Subject: NV50: Use bios table for load pattern when possible.

---
 linux-core/nouveau_bios.c   | 40 ++++++++++++++++++++++++++++++++++++++--
 linux-core/nv50_connector.c |  1 -
 linux-core/nv50_dac.c       |  9 ++++++++-
 3 files changed, 46 insertions(+), 4 deletions(-)

(limited to 'linux-core')

diff --git a/linux-core/nouveau_bios.c b/linux-core/nouveau_bios.c
index 3e7fe23f..370d6522 100644
--- a/linux-core/nouveau_bios.c
+++ b/linux-core/nouveau_bios.c
@@ -128,6 +128,39 @@ struct bit_entry {
 	uint16_t offset;
 };
 
+static int parse_bit_A_tbl_entry(struct drm_device *dev, struct bios *bios, struct bit_entry *bitentry)
+{
+	/* Parses the load detect value table.
+	 *
+	 * Starting at bitentry->offset:
+	 *
+	 * offset + 0 (16 bits): table pointer
+	 */
+
+	uint16_t load_table_pointer;
+
+	if (bitentry->length != 3) {
+		DRM_ERROR("Do not understand BIT loadval table\n");
+		return 0;
+	}
+
+	load_table_pointer = le16_to_cpu(*((uint16_t *)(&bios->data[bitentry->offset])));
+
+	if (load_table_pointer == 0x0) {
+		DRM_ERROR("Pointer to loadval table invalid\n");
+		return 0;
+	}
+
+	/* Some kind of signature */
+	if (bios->data[load_table_pointer] != 16 || bios->data[load_table_pointer + 1] != 4 || 
+		bios->data[load_table_pointer + 2] != 4 || bios->data[load_table_pointer + 3] != 2)
+		return 0;
+
+	bios->dactestval = le32_to_cpu(*((uint32_t *)&bios->data[load_table_pointer + 4])) & 0x3FF;
+
+	return 1;
+}
+
 static int parse_bit_C_tbl_entry(struct drm_device *dev, struct bios *bios, struct bit_entry *bitentry)
 {
 	/* offset + 8  (16 bits): PLL limits table pointer
@@ -136,7 +169,7 @@ static int parse_bit_C_tbl_entry(struct drm_device *dev, struct bios *bios, stru
 	 */
 
 	if (bitentry->length < 10) {
-		DRM_ERROR( "Do not understand BIT C table\n");
+		DRM_ERROR("Do not understand BIT C table\n");
 		return 0;
 	}
 
@@ -149,7 +182,7 @@ static void parse_bit_structure(struct drm_device *dev, struct bios *bios, const
 {
 	int entries = bios->data[bitoffset + 4];
 	/* parse i first, I next (which needs C & M before it), and L before D */
-	char parseorder[] = "iCMILDT";
+	char parseorder[] = "iCMILDTA";
 	struct bit_entry bitentry;
 	int i, j, offset;
 
@@ -164,6 +197,9 @@ static void parse_bit_structure(struct drm_device *dev, struct bios *bios, const
 				continue;
 
 			switch (bitentry.id[0]) {
+			case 'A':
+				parse_bit_A_tbl_entry(dev, bios, &bitentry);
+				break;
 			case 'C':
 				parse_bit_C_tbl_entry(dev, bios, &bitentry);
 				break;
diff --git a/linux-core/nv50_connector.c b/linux-core/nv50_connector.c
index 6e5fb912..34706bae 100644
--- a/linux-core/nv50_connector.c
+++ b/linux-core/nv50_connector.c
@@ -79,7 +79,6 @@ static struct nv50_output *nv50_connector_to_output(struct nv50_connector *conne
 static int nv50_connector_hpd_detect(struct nv50_connector *connector)
 {
 	struct drm_nouveau_private *dev_priv = connector->dev->dev_private;
-	struct nv50_output *output = NULL;
 	bool present = 0;
 	uint32_t reg = 0;
 
diff --git a/linux-core/nv50_dac.c b/linux-core/nv50_dac.c
index 3f007166..5dddb469 100644
--- a/linux-core/nv50_dac.c
+++ b/linux-core/nv50_dac.c
@@ -146,7 +146,14 @@ static int nv50_dac_detect(struct nv50_output *output)
 	NV_WRITE(NV50_PDISPLAY_DAC_REGS_DPMS_CTRL(or), 0x00150000 | NV50_PDISPLAY_DAC_REGS_DPMS_CTRL_PENDING);
 	while (NV_READ(NV50_PDISPLAY_DAC_REGS_DPMS_CTRL(or)) & NV50_PDISPLAY_DAC_REGS_DPMS_CTRL_PENDING);
 
-	load_pattern = 340; /* TODO: use a bios table for this */
+	/* Use bios provided value if possible. */
+	if (dev_priv->bios.dactestval) {
+		load_pattern = dev_priv->bios.dactestval;
+		NV50_DEBUG("Using bios provided load_pattern of %d\n", load_pattern);
+	} else {
+		load_pattern = 340;
+		NV50_DEBUG("Using default load_pattern of %d\n", load_pattern);
+	}
 
 	NV_WRITE(NV50_PDISPLAY_DAC_REGS_LOAD_CTRL(or), NV50_PDISPLAY_DAC_REGS_LOAD_CTRL_ACTIVE | load_pattern);
 	udelay(10000); /* give it some time to process */
-- 
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