From: Chris Wilson <chris at chris-wilson.co.uk>
As we retrieve the mode from the BIOS it may be constructed using
different assumptions for its configuration, such as utilizing the panel
fitter in a conflicting manner. As such the associated framebuffer may be
insufficient for our setup, and so we need to reject the current mode
and install our own.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_display.c | 38 +++++++++++++++++++++++++---------
1 file changed, 28 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8ca47e5..0a2279e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6450,27 +6450,40 @@ intel_framebuffer_create_for_mode(struct drm_device *dev,
return intel_framebuffer_create(dev, &mode_cmd, obj);
}
+static bool
+mode_fits_in_fb(struct drm_display_mode *mode,
+ struct drm_framebuffer *fb)
+{
+ struct drm_i915_gem_object *obj;
+ int min_pitch;
+
+ min_pitch = intel_framebuffer_pitch_for_width(mode->hdisplay,
+ fb->bits_per_pixel);
+ if (fb->pitches[0] < min_pitch)
+ return false;
+
+ obj = to_intel_framebuffer(fb)->obj;
+ if (obj == NULL)
+ return false;
+
+ if (obj->base.size < mode->vdisplay * fb->pitches[0])
+ return false;
+
+ return true;
+}
+
static struct drm_framebuffer *
mode_fits_in_fbdev(struct drm_device *dev,
struct drm_display_mode *mode)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- struct drm_i915_gem_object *obj;
struct drm_framebuffer *fb;
if (dev_priv->fbdev == NULL)
return NULL;
- obj = dev_priv->fbdev->ifb.obj;
- if (obj == NULL)
- return NULL;
-
fb = &dev_priv->fbdev->ifb.base;
- if (fb->pitches[0] < intel_framebuffer_pitch_for_width(mode->hdisplay,
- fb->bits_per_pixel))
- return NULL;
-
- if (obj->base.size < mode->vdisplay * fb->pitches[0])
+ if (!mode_fits_in_fb(mode, fb))
return NULL;
return fb;
@@ -9127,6 +9140,11 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
if (crtc->base.enabled)
crtc->mode_valid = intel_crtc_get_mode(&crtc->base, &crtc->base.mode);
+
+ if (crtc->base.fb &&
+ !mode_fits_in_fb(&crtc->base.mode, crtc->base.fb))
+ crtc->mode_valid = false;
+
if (crtc->mode_valid) {
DRM_DEBUG_KMS("found active mode: ");
drm_mode_debug_printmodeline(&crtc->base.mode);
--
1.7.9.5
