drm/i915: fix bpc vs. bpp confusion in intel_crtc_compute_config

Oops.

This regression has been introduced in

commit 5d2d38dd
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Mar 27 00:45:01 2013 +0100

    drm/i915: clean up pipe bpp confusion
Reported-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -4003,9 +4003,9 @@ static bool intel_crtc_compute_config(struct drm_crtc *crtc,
 		adjusted_mode->hsync_start == adjusted_mode->hdisplay)
 		return false;
 
-	if ((IS_G4X(dev) || IS_VALLEYVIEW(dev)) && pipe_config->pipe_bpp > 10) {
+	if ((IS_G4X(dev) || IS_VALLEYVIEW(dev)) && pipe_config->pipe_bpp > 10*3) {
 		pipe_config->pipe_bpp = 10*3; /* 12bpc is gen5+ */
-	} else if (INTEL_INFO(dev)->gen <= 4 && pipe_config->pipe_bpp > 8) {
+	} else if (INTEL_INFO(dev)->gen <= 4 && pipe_config->pipe_bpp > 8*3) {
 		/* only a 8bpc pipe, with 6bpc dither through the panel fitter
 		 * for lvds. */
 		pipe_config->pipe_bpp = 8*3;