drm: Use spread spectrum when the bios tells us it's ok.

Lifted from the DDX modesetting.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7325363164f84cf26a2f39bc3312753d1c31f28b..135a08f615cd066802f9888cfe860239e05c3984 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -184,6 +184,8 @@ typedef struct drm_i915_private {
        unsigned int lvds_dither:1;
        unsigned int lvds_vbt:1;
        unsigned int int_crt_support:1;
+       unsigned int lvds_use_ssc:1;
+       int lvds_ssc_freq;
 
        struct drm_i915_fence_reg fence_regs[16]; /* assume 965 */
        int fence_reg_start; /* 4 if userland hasn't ioctl'd us yet */

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 4ca82a0255255e09f82426bc23b2bc25da555f08..65be30dccc7767d8781cad444a317c43930a6064 100644 (file)
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -135,6 +135,14 @@ parse_general_features(struct drm_i915_private *dev_priv,
        if (general) {
                dev_priv->int_tv_support = general->int_tv_support;
                dev_priv->int_crt_support = general->int_crt_support;
+               dev_priv->lvds_use_ssc = general->enable_ssc;
+
+               if (dev_priv->lvds_use_ssc) {
+                 if (IS_I855(dev_priv->dev))
+                   dev_priv->lvds_ssc_freq = general->ssc_freq ? 66 : 48;
+                 else
+                   dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 96;
+               }
        }
 }
 

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8b2038706268663e835615ffc550cbbcf1e9238c..13f9b6667c94a336647ed618a9c2ba260828aeef 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -217,7 +217,7 @@ bool intel_pipe_has_type (struct drm_crtc *crtc, int type)
     return false;
 }
 
-#define INTELPllInvalid(s)   { /* ErrorF (s) */; return false; }
+#define INTELPllInvalid(s)   do { DRM_DEBUG(s); return false; } while (0)
 /**
  * Returns whether the given set of divisors are valid for a given refclk with
  * the given connectors.
@@ -726,7 +726,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
        int dspsize_reg = (pipe == 0) ? DSPASIZE : DSPBSIZE;
        int dsppos_reg = (pipe == 0) ? DSPAPOS : DSPBPOS;
        int pipesrc_reg = (pipe == 0) ? PIPEASRC : PIPEBSRC;
-       int refclk;
+       int refclk, num_outputs = 0;
        intel_clock_t clock;
        u32 dpll = 0, fp = 0, dspcntr, pipeconf;
        bool ok, is_sdvo = false, is_dvo = false;
@@ -763,9 +763,14 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                        is_crt = true;
                        break;
                }
+
+               num_outputs++;
        }
 
-       if (IS_I9XX(dev)) {
+       if (is_lvds && dev_priv->lvds_use_ssc && num_outputs < 2) {
+               refclk = dev_priv->lvds_ssc_freq * 1000;
+               DRM_DEBUG("using SSC reference clock of %d MHz\n", refclk / 1000);
+       } else if (IS_I9XX(dev)) {
                refclk = 96000;
        } else {
                refclk = 48000;
@@ -824,11 +829,14 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                }
        }
 
-       if (is_tv) {
+       if (is_sdvo && is_tv)
+               dpll |= PLL_REF_INPUT_TVCLKINBC;
+       else if (is_tv)
                /* XXX: just matching BIOS for now */
-/*     dpll |= PLL_REF_INPUT_TVCLKINBC; */
+               /*      dpll |= PLL_REF_INPUT_TVCLKINBC; */
                dpll |= 3;
-       }
+       else if (is_lvds && dev_priv->lvds_use_ssc && num_outputs < 2)
+               dpll |= PLLB_REF_INPUT_SPREADSPECTRUMIN;
        else
                dpll |= PLL_REF_INPUT_DREFCLK;