linux-kernel - [PATCH 3.11 132/208] drm/i915: Fix pipe CSC post offset calculation

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Message-Id: <1387454106-19326-133-git-send-email-luis.henriques@canonical.com>
Date:	Thu, 19 Dec 2013 11:53:50 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 132/208] drm/i915: Fix pipe CSC post offset calculation

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

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

From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@...ux.intel.com>

commit 32cf0cb0294814cb1ee5d8727e9aac0e9aa80d2e upstream.

We were miscalculating the pipe CSC post offset for the full->limited
range conversion. The resulting post offset was double what it was
supposed to be, which caused blacks to come out grey when using
limited range output on HSW+.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71769
Tested-by: Lauri Mylläri <lauri.myllari@...il.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/gpu/drm/i915/intel_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 449ec09..9d39620 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5466,7 +5466,7 @@ static void intel_set_pipe_csc(struct drm_crtc *crtc)
 		uint16_t postoff = 0;
 
 		if (intel_crtc->config.limited_color_range)
-			postoff = (16 * (1 << 13) / 255) & 0x1fff;
+			postoff = (16 * (1 << 12) / 255) & 0x1fff;
 
 		I915_WRITE(PIPE_CSC_POSTOFF_HI(pipe), postoff);
 		I915_WRITE(PIPE_CSC_POSTOFF_ME(pipe), postoff);
-- 
1.8.3.2

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