drm/i915: Fix pipe CSC post offset calculation

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@gmail.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c714d4d5bedbf07c7b5aad2f827251d85153f267..f1e600490bb2212940dcd025f97652d13bf2aa25 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5225,7 +5225,7 @@ 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);