drm/i915: Do not put big intel_crtc_state on the stack

Having this on stack triggers the -Wframe-larger-than=1024 and
is not nice to put such big things on the kernel stack anyway.

This required a little bit of refactoring to handle the new
failure path from vlv_force_pll_on.

v2: Corrected some whitespace.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: John Harrison <john.c.harrison@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1453217117-26125-1-git-send-email-tvrtko.ursulin@linux.intel.com

3 files changed, 46 insertions, 26 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3260fc639b07..f5c7f9fbb5ff 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7600,26 +7600,34 @@ static void chv_prepare_pll(struct intel_crtc *crtc,
  * in cases where we need the PLL enabled even when @pipe is not going to
  * be enabled.
  */
-void vlv_force_pll_on(struct drm_device *dev, enum pipe pipe,
-                      const struct dpll *dpll)
+int vlv_force_pll_on(struct drm_device *dev, enum pipe pipe,
+                     const struct dpll *dpll)
 {
         struct intel_crtc *crtc =
                 to_intel_crtc(intel_get_crtc_for_pipe(dev, pipe));
-        struct intel_crtc_state pipe_config = {
-                .base.crtc = &crtc->base,
-                .pixel_multiplier = 1,
-                .dpll = *dpll,
-        };
+        struct intel_crtc_state *pipe_config;
+
+        pipe_config = kzalloc(sizeof(*pipe_config), GFP_KERNEL);
+        if (!pipe_config)
+                return -ENOMEM;
+
+        pipe_config->base.crtc = &crtc->base;
+        pipe_config->pixel_multiplier = 1;
+        pipe_config->dpll = *dpll;
 
         if (IS_CHERRYVIEW(dev)) {
-                chv_compute_dpll(crtc, &pipe_config);
-                chv_prepare_pll(crtc, &pipe_config);
-                chv_enable_pll(crtc, &pipe_config);
+                chv_compute_dpll(crtc, pipe_config);
+                chv_prepare_pll(crtc, pipe_config);
+                chv_enable_pll(crtc, pipe_config);
         } else {
-                vlv_compute_dpll(crtc, &pipe_config);
-                vlv_prepare_pll(crtc, &pipe_config);
-                vlv_enable_pll(crtc, &pipe_config);
+                vlv_compute_dpll(crtc, pipe_config);
+                vlv_prepare_pll(crtc, pipe_config);
+                vlv_enable_pll(crtc, pipe_config);
         }
+
+        kfree(pipe_config);
+
+        return 0;
 }
 
 /**
@@ -10793,7 +10801,7 @@ struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
         enum transcoder cpu_transcoder = intel_crtc->config->cpu_transcoder;
         struct drm_display_mode *mode;
-        struct intel_crtc_state pipe_config;
+        struct intel_crtc_state *pipe_config;
         int htot = I915_READ(HTOTAL(cpu_transcoder));
         int hsync = I915_READ(HSYNC(cpu_transcoder));
         int vtot = I915_READ(VTOTAL(cpu_transcoder));
@@ -10804,6 +10812,12 @@ struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
         if (!mode)
                 return NULL;
 
+        pipe_config = kzalloc(sizeof(*pipe_config), GFP_KERNEL);
+        if (!pipe_config) {
+                kfree(mode);
+                return NULL;
+        }
+
         /*
          * Construct a pipe_config sufficient for getting the clock info
          * back out of crtc_clock_get.
@@ -10811,14 +10825,14 @@ struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
          * Note, if LVDS ever uses a non-1 pixel multiplier, we'll need
          * to use a real value here instead.
          */
-        pipe_config.cpu_transcoder = (enum transcoder) pipe;
-        pipe_config.pixel_multiplier = 1;
-        pipe_config.dpll_hw_state.dpll = I915_READ(DPLL(pipe));
-        pipe_config.dpll_hw_state.fp0 = I915_READ(FP0(pipe));
-        pipe_config.dpll_hw_state.fp1 = I915_READ(FP1(pipe));
-        i9xx_crtc_clock_get(intel_crtc, &pipe_config);
-
-        mode->clock = pipe_config.port_clock / pipe_config.pixel_multiplier;
+        pipe_config->cpu_transcoder = (enum transcoder) pipe;
+        pipe_config->pixel_multiplier = 1;
+        pipe_config->dpll_hw_state.dpll = I915_READ(DPLL(pipe));
+        pipe_config->dpll_hw_state.fp0 = I915_READ(FP0(pipe));
+        pipe_config->dpll_hw_state.fp1 = I915_READ(FP1(pipe));
+        i9xx_crtc_clock_get(intel_crtc, pipe_config);
+
+        mode->clock = pipe_config->port_clock / pipe_config->pixel_multiplier;
         mode->hdisplay = (htot & 0xffff) + 1;
         mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
         mode->hsync_start = (hsync & 0xffff) + 1;
@@ -10830,6 +10844,8 @@ struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
 
         drm_mode_set_name(mode);
 
+        kfree(pipe_config);
+
         return mode;
 }
 
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 17612548c58d..e2bea710614f 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -335,8 +335,12 @@ vlv_power_sequencer_kick(struct intel_dp *intel_dp)
                 release_cl_override = IS_CHERRYVIEW(dev) &&
                         !chv_phy_powergate_ch(dev_priv, phy, ch, true);
 
-                vlv_force_pll_on(dev, pipe, IS_CHERRYVIEW(dev) ?
-                                 &chv_dpll[0].dpll : &vlv_dpll[0].dpll);
+                if (vlv_force_pll_on(dev, pipe, IS_CHERRYVIEW(dev) ?
+                                     &chv_dpll[0].dpll : &vlv_dpll[0].dpll)) {
+                        DRM_ERROR("Failed to force on pll for pipe %c!\n",
+                                  pipe_name(pipe));
+                        return;
+                }
         }
 
         /*
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 15917e3a3352..bc970125ec76 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1154,8 +1154,8 @@ void assert_shared_dpll(struct drm_i915_private *dev_priv,
 struct intel_shared_dpll *intel_get_shared_dpll(struct intel_crtc *crtc,
                                                 struct intel_crtc_state *state);
 
-void vlv_force_pll_on(struct drm_device *dev, enum pipe pipe,
-                      const struct dpll *dpll);
+int vlv_force_pll_on(struct drm_device *dev, enum pipe pipe,
+                     const struct dpll *dpll);
 void vlv_force_pll_off(struct drm_device *dev, enum pipe pipe);
 
 /* modesetting asserts */