From: Ben Skeggs <bskeggs@redhat.com>
Date: Tue, 28 Sep 2010 00:23:20 +0000 (+1000)
Subject: drm/nouveau: fix required mode bandwidth calculation for DP
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=62acdc71cfbc816b26a57d89f433f8afaf4ff78d;p=deliverable%2Flinux.git

drm/nouveau: fix required mode bandwidth calculation for DP

This should fix eDP on certain laptops with 18-bit panels, we were rejecting
the panel's native mode due to thinking there was insufficient bandwidth
for it.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 4b286a8c30c8..0871495096fa 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -76,6 +76,22 @@ nouveau_encoder_connector_get(struct nouveau_encoder *encoder)
 	return NULL;
 }
 
+/*TODO: This could use improvement, and learn to handle the fixed
+ *      BIOS tables etc.  It's fine currently, for its only user.
+ */
+int
+nouveau_connector_bpp(struct drm_connector *connector)
+{
+	struct nouveau_connector *nv_connector = nouveau_connector(connector);
+
+	if (nv_connector->edid && nv_connector->edid->revision >= 4) {
+		u8 bpc = ((nv_connector->edid->input & 0x70) >> 3) + 4;
+		if (bpc > 4)
+			return bpc;
+	}
+
+	return 18;
+}
 
 static void
 nouveau_connector_destroy(struct drm_connector *drm_connector)
@@ -666,7 +682,7 @@ nouveau_connector_mode_valid(struct drm_connector *connector,
 		else
 			max_clock = nv_encoder->dp.link_nr * 162000;
 
-		clock *= 3;
+		clock = clock * nouveau_connector_bpp(connector) / 8;
 		break;
 	default:
 		BUG_ON(1);
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.h b/drivers/gpu/drm/nouveau/nouveau_connector.h
index 0d2e668ccfe5..c21ed6b16f88 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.h
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.h
@@ -55,4 +55,7 @@ nouveau_connector_create(struct drm_device *, int index);
 void
 nouveau_connector_set_polling(struct drm_connector *);
 
+int
+nouveau_connector_bpp(struct drm_connector *);
+
 #endif /* __NOUVEAU_CONNECTOR_H__ */