Fix display underruns on Pineview with 2048x1280 VGA display.

[cascardo/linux.git] / drivers / gpu / drm / i915 / intel_display.c

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6bfbd35..074d283 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5324,14 +5324,14 @@ static int i9xx_crtc_mode_set(struct drm_crtc *crtc,
                dspcntr |= DISPPLANE_SEL_PIPE_B;
 
        if (pipe == 0 && INTEL_INFO(dev)->gen < 4) {
-               /* Enable pixel doubling when the dot clock is > 90% of the (display)
+               /* Enable pixel doubling when the dot clock is > 85% of the (display)
                 * core speed.
                 *
                 * XXX: No double-wide on 915GM pipe B. Is that the only reason for the
                 * pipe == 0 check?
                 */
                if (mode->clock >
-                   dev_priv->display.get_display_clock_speed(dev) * 9 / 10)
+                   dev_priv->display.get_display_clock_speed(dev) * 17 / 20)
                        pipeconf |= PIPECONF_DOUBLE_WIDE;
                else
                        pipeconf &= ~PIPECONF_DOUBLE_WIDE;