From bc104d1f10eb6001f1b1003a5a92066a1b03f080 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 20 Mar 2014 15:11:21 +0000 Subject: [PATCH] drm/i915: Fix the computation of required fb size for pipe The computation of required framebuffer size in commit d978ef14456a38034f6c0e94a794129501f89200 Author: Jesse Barnes 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 Cc: Jesse Barnes Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_fbdev.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c index d6d78c86c232..86b012ca7217 100644 --- a/drivers/gpu/drm/i915/intel_fbdev.c +++ b/drivers/gpu/drm/i915/intel_fbdev.c @@ -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",