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drm/i915: Fix the computation of required fb size for pipe

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The computation of required framebuffer size in

commit d978ef1445
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>
This commit is contained in:
Chris Wilson 2014-03-20 15:11:21 +00:00 committed by Daniel Vetter
parent c8431fda9f
commit bc104d1f10
1 changed files with 21 additions and 8 deletions
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29
drivers/gpu/drm/i915/intel_fbdev.c
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@ -518,16 +518,29 @@ static bool intel_fbdev_init_bios(struct drm_device *dev,
/*
* 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",