drm/i915: Fix the computation of required fb size for pipe
The computation of required framebuffer size in
commit d978ef14456a38034f6c0e94a794129501f89200
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Fri Mar 7 08:57:51 2014 -0800
drm/i915: Wrap the preallocated BIOS framebuffer and preserve for KMS fbcon v12
is too optimistic, and would rely on the invariant fb being
reconstructed to exactly fit each pipe (and probably ignore hardware
limits). Instead, we want to compute the upper bound on what the display
engine will access and ensure that is within the inherited framebuffer.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index d6d78c8..86b012c 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -518,16 +518,29 @@
/*
* See if the plane fb we found above will fit on this
- * pipe. Note we need to use the selected fb's bpp rather
- * than the current pipe's, since they could be different.
+ * pipe. Note we need to use the selected fb's pitch and bpp
+ * rather than the current pipe's, since they differ.
*/
- cur_size = intel_crtc->config.adjusted_mode.crtc_hdisplay *
- intel_crtc->config.adjusted_mode.crtc_vdisplay;
- DRM_DEBUG_KMS("pipe %c area: %d\n", pipe_name(intel_crtc->pipe),
+ cur_size = intel_crtc->config.adjusted_mode.crtc_hdisplay;
+ cur_size = cur_size * fb->base.bits_per_pixel / 8;
+ if (fb->base.pitches[0] < cur_size) {
+ DRM_DEBUG_KMS("fb not wide enough for plane %c (%d vs %d)\n",
+ pipe_name(intel_crtc->pipe),
+ cur_size, fb->base.pitches[0]);
+ plane_config = NULL;
+ fb = NULL;
+ break;
+ }
+
+ cur_size = intel_crtc->config.adjusted_mode.crtc_vdisplay;
+ cur_size = ALIGN(cur_size, plane_config->tiled ? (IS_GEN2(dev) ? 16 : 8) : 1);
+ cur_size *= fb->base.pitches[0];
+ DRM_DEBUG_KMS("pipe %c area: %dx%d, bpp: %d, size: %d\n",
+ pipe_name(intel_crtc->pipe),
+ intel_crtc->config.adjusted_mode.crtc_hdisplay,
+ intel_crtc->config.adjusted_mode.crtc_vdisplay,
+ fb->base.bits_per_pixel,
cur_size);
- cur_size *= fb->base.bits_per_pixel / 8;
- DRM_DEBUG_KMS("total size %d (bpp %d)\n", cur_size,
- fb->base.bits_per_pixel / 8);
if (cur_size > max_size) {
DRM_DEBUG_KMS("fb not big enough for plane %c (%d vs %d)\n",