linux-kernel - [ 09/69] drm/nouveau: default to 8bpc for non-LVDS panels if EDID isnt useful

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Message-Id: <20120617175942.645547568@decadent.org.uk>
Date:	Sun, 17 Jun 2012 18:59:50 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Ben Skeggs <bskeggs@...hat.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [ 09/69] drm/nouveau: default to 8bpc for non-LVDS panels if EDID isnt
 useful

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Skeggs <bskeggs@...hat.com>

commit c8435362f2211086b34ce871fa9c3fcc7ca79ff9 upstream.

A few reports of bad behaviour since the autodetection defaulted to 6bpc,
lets fix this.

Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpu/drm/nouveau/nouveau_connector.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 8f510fd..fa86035 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -654,10 +654,13 @@ nouveau_connector_detect_depth(struct drm_connector *connector)
 	if (nv_connector->edid && connector->display_info.bpc)
 		return;
 
-	/* if not, we're out of options unless we're LVDS, default to 6bpc */
-	connector->display_info.bpc = 6;
-	if (nv_encoder->dcb->type != OUTPUT_LVDS)
+	/* if not, we're out of options unless we're LVDS, default to 8bpc */
+	if (nv_encoder->dcb->type != OUTPUT_LVDS) {
+		connector->display_info.bpc = 8;
 		return;
+	}
+
+	connector->display_info.bpc = 6;
 
 	/* LVDS: panel straps */
 	if (bios->fp_no_ddc) {


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