drm/i915: Write zero to DPLL_MD Reg for non-SDVO output

When the output device is LVDS, maybe the pixel clock of adjusted_mode will be
less than that in mode. In such case it will set the incorrect multipler factor
in DPLL_MD register.
So the dpll_md_reg will be reset when the output type is non-SDVO

https://bugs.freedesktop.org/show_bug.cgi?id=22761

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Reviewd-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 155719f..cb5305c 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2652,9 +2652,12 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                udelay(150);
 
                if (IS_I965G(dev) && !IS_IGDNG(dev)) {
-                       sdvo_pixel_multiply = adjusted_mode->clock / mode->clock;
-                       I915_WRITE(dpll_md_reg, (0 << DPLL_MD_UDI_DIVIDER_SHIFT) |
+                       if (is_sdvo) {
+                               sdvo_pixel_multiply = adjusted_mode->clock / mode->clock;
+                               I915_WRITE(dpll_md_reg, (0 << DPLL_MD_UDI_DIVIDER_SHIFT) |
                                        ((sdvo_pixel_multiply - 1) << DPLL_MD_UDI_MULTIPLIER_SHIFT));
+                       } else
+                               I915_WRITE(dpll_md_reg, 0);
                } else {
                        /* write it again -- the BIOS does, after all */
                        I915_WRITE(dpll_reg, dpll);