drm/i915: fix FP CB tuning limits for lvds

Only on IBX should we set the limiting factor to 25 unconditionally
for dual-channel mode, on CPT/PPT 25 only applies when the lvds
refclock is 100MHz.

Reviewed-by: Paulo Zanoni <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index baacfcbbbbe78eb4b774556668a87f3ef0e7ac93..f235e8a48b3857cdbaefb1952581fb2d4987d059 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5503,7 +5503,7 @@ static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
        if (is_lvds) {
                if ((intel_panel_use_ssc(dev_priv) &&
                     dev_priv->lvds_ssc_freq == 100) ||
-                   intel_is_dual_link_lvds(dev))
+                   (HAS_PCH_IBX(dev) && intel_is_dual_link_lvds(dev)))
                        factor = 25;
        } else if (is_sdvo && is_tv)
                factor = 20;