drm/i915: Only print the info message about incresing stolen size for FBC once

Instead of repeatedly bombarding the user with a request to reboot and
increase the stolen size with every fb refresh, just inform them the
first time only.

v2: Rearrange code so the hint to increase the amount of memory stolen
by the BIOS is only emitted if we fail to find sufficient stolen memory
for FBC.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Fixup formatting code mismatch that gcc spotted.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem_stolen.c

@@ -136,6 +136,7 @@ static int i915_setup_compression(struct drm_device *dev, int size)
 err_fb:
 	drm_mm_put_block(compressed_fb);
 err:
+	pr_info_once("drm: not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size);
 	return -ENOSPC;
 }
 

drivers/gpu/drm/i915/intel_pm.c

@@ -481,8 +481,6 @@ void intel_update_fbc(struct drm_device *dev)
 		goto out_disable;
 
 	if (i915_gem_stolen_setup_compression(dev, intel_fb->obj->base.size)) {
-		DRM_INFO("not enough stolen space for compressed buffer (need %zd bytes), disabling\n", intel_fb->obj->base.size);
-		DRM_INFO("hint: you may be able to increase stolen memory size in the BIOS to avoid this\n");
 		DRM_DEBUG_KMS("framebuffer too large, disabling compression\n");
 		dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
 		goto out_disable;