Commit 619d4d04 authored Feb 27, 2014 by Ville Syrjälä Committed by Daniel Vetter Mar 05, 2014

drm/i915: Use DIV_ROUND_UP() when calculating number of required FDI lanes



If we need precisely N lanes to satisfy the FDI bandwidth requirement,
the code would still claim that we need N+1 lanes. Use DIV_ROUND_UP()
to get a more accurate answer.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

parent 8f7abfd8

drivers/gpu/drm/i915/intel_display.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -6161,7 +6161,7 @@ int ironlake_get_lanes_required(int target_clock, int link_bw, int bpp)
		* is 2.5%; use 5% for safety's sake.
		*/
		u32 bps = target_clock * bpp * 21 / 20;
		return bps / (link_bw * 8) + 1;
		return DIV_ROUND_UP(bps, link_bw * 8);
		}

		static bool ironlake_needs_fb_cb_tune(struct dpll *dpll, int factor)