drm/i915: Split i8xx_crtc_compute_clock()

Split a GEN2 specific version from i9xx_crtc_compute_clock(). With this
there is no need for i9xx_get_refclk() anymore, and the differences
between platforms become more obvious.

v2: Use i8xx as prefix instead of gen2. (Ville and Daniel)
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458653723-17951-1-git-send-email-ander.conselvan.de.oliveira@intel.com

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 688fdb8..611757a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -593,7 +593,7 @@ intel_limit(struct intel_crtc_state *crtc_state, int refclk)
        const intel_limit_t *limit;
 
        if (IS_BROXTON(dev) || IS_CHERRYVIEW(dev) || IS_VALLEYVIEW(dev) ||
-           HAS_PCH_SPLIT(dev))
+           HAS_PCH_SPLIT(dev) || IS_GEN2(dev))
                limit = NULL;
 
        if (IS_G4X(dev)) {
@@ -608,13 +608,6 @@ intel_limit(struct intel_crtc_state *crtc_state, int refclk)
                        limit = &intel_limits_i9xx_lvds;
                else
                        limit = &intel_limits_i9xx_sdvo;
-       } else {
-               if (intel_pipe_will_have_type(crtc_state, INTEL_OUTPUT_LVDS))
-                       limit = &intel_limits_i8xx_lvds;
-               else if (intel_pipe_will_have_type(crtc_state, INTEL_OUTPUT_DVO))
-                       limit = &intel_limits_i8xx_dvo;
-               else
-                       limit = &intel_limits_i8xx_dac;
        }
 
        WARN_ON(limit == NULL);
@@ -7047,27 +7040,6 @@ static inline bool intel_panel_use_ssc(struct drm_i915_private *dev_priv)
                && !(dev_priv->quirks & QUIRK_LVDS_SSC_DISABLE);
 }
 
-static int i9xx_get_refclk(const struct intel_crtc_state *crtc_state)
-{
-       struct drm_device *dev = crtc_state->base.crtc->dev;
-       struct drm_i915_private *dev_priv = dev->dev_private;
-       int refclk;
-
-       WARN_ON(!crtc_state->base.state);
-
-       if (intel_pipe_will_have_type(crtc_state, INTEL_OUTPUT_LVDS) &&
-           intel_panel_use_ssc(dev_priv)) {
-               refclk = dev_priv->vbt.lvds_ssc_freq;
-               DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
-       } else if (!IS_GEN2(dev)) {
-               refclk = 96000;
-       } else {
-               refclk = 48000;
-       }
-
-       return refclk;
-}
-
 static uint32_t pnv_dpll_compute_fp(struct dpll *dpll)
 {
        return (1 << dpll->n) << 16 | dpll->m2;
@@ -7822,14 +7794,50 @@ static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc)
        POSTING_READ(PIPECONF(intel_crtc->pipe));
 }
 
+static int i8xx_crtc_compute_clock(struct intel_crtc *crtc,
+                                  struct intel_crtc_state *crtc_state)
+{
+       struct drm_device *dev = crtc->base.dev;
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       const intel_limit_t *limit;
+       int refclk = 48000;
+
+       memset(&crtc_state->dpll_hw_state, 0,
+              sizeof(crtc_state->dpll_hw_state));
+
+       if (intel_pipe_will_have_type(crtc_state, INTEL_OUTPUT_LVDS)) {
+               if (intel_panel_use_ssc(dev_priv)) {
+                       refclk = dev_priv->vbt.lvds_ssc_freq;
+                       DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
+               }
+
+               limit = &intel_limits_i8xx_lvds;
+       } else if (intel_pipe_will_have_type(crtc_state, INTEL_OUTPUT_DVO)) {
+               limit = &intel_limits_i8xx_dvo;
+       } else {
+               limit = &intel_limits_i8xx_dac;
+       }
+
+       if (!crtc_state->clock_set &&
+           !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
+                                refclk, NULL, &crtc_state->dpll)) {
+               DRM_ERROR("Couldn't find PLL settings for mode!\n");
+               return -EINVAL;
+       }
+
+       i8xx_compute_dpll(crtc, crtc_state, NULL);
+
+       return 0;
+}
+
 static int i9xx_crtc_compute_clock(struct intel_crtc *crtc,
                                   struct intel_crtc_state *crtc_state)
 {
        struct drm_device *dev = crtc->base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
-       int refclk;
        bool ok;
        const intel_limit_t *limit;
+       int refclk = 96000;
 
        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));
@@ -7837,9 +7845,13 @@ static int i9xx_crtc_compute_clock(struct intel_crtc *crtc,
        if (crtc_state->has_dsi_encoder)
                return 0;
 
-       if (!crtc_state->clock_set) {
-               refclk = i9xx_get_refclk(crtc_state);
+       if (intel_pipe_will_have_type(crtc_state, INTEL_OUTPUT_LVDS) &&
+           intel_panel_use_ssc(dev_priv)) {
+               refclk = dev_priv->vbt.lvds_ssc_freq;
+               DRM_DEBUG_KMS("using SSC reference clock of %d kHz\n", refclk);
+       }
 
+       if (!crtc_state->clock_set) {
                /*
                 * Returns a set of divisors for the desired target clock with
                 * the given refclk, or FALSE.  The returned values represent
@@ -7857,11 +7869,7 @@ static int i9xx_crtc_compute_clock(struct intel_crtc *crtc,
                }
        }
 
-       if (IS_GEN2(dev)) {
-               i8xx_compute_dpll(crtc, crtc_state, NULL);
-       } else {
-               i9xx_compute_dpll(crtc, crtc_state, NULL);
-       }
+       i9xx_compute_dpll(crtc, crtc_state, NULL);
 
        return 0;
 }
@@ -14818,13 +14826,20 @@ void intel_init_display_hooks(struct drm_i915_private *dev_priv)
                dev_priv->display.crtc_compute_clock = vlv_crtc_compute_clock;
                dev_priv->display.crtc_enable = valleyview_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
-       } else {
+       } else if (!IS_GEN2(dev_priv)) {
                dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
                dev_priv->display.get_initial_plane_config =
                        i9xx_get_initial_plane_config;
                dev_priv->display.crtc_compute_clock = i9xx_crtc_compute_clock;
                dev_priv->display.crtc_enable = i9xx_crtc_enable;
                dev_priv->display.crtc_disable = i9xx_crtc_disable;
+       } else {
+               dev_priv->display.get_pipe_config = i9xx_get_pipe_config;
+               dev_priv->display.get_initial_plane_config =
+                       i9xx_get_initial_plane_config;
+               dev_priv->display.crtc_compute_clock = i8xx_crtc_compute_clock;
+               dev_priv->display.crtc_enable = i9xx_crtc_enable;
+               dev_priv->display.crtc_disable = i9xx_crtc_disable;
        }
 
        /* Returns the core display clock speed */