Quoting Ville Syrjala (2019-11-06 17:23:49)
From: Ville Syrjälä ville.syrjala@linux.intel.com
Make sure we have a crtc before probing its primary plane's max stride. Initially I thought we can't get this far without crtcs, but looks like we can via the dumb_create ioctl.
Not sure if we shouldn't disable dumb buffer support entirely when we have no crtcs, but that would require some amount of work as the only thing currently being checked is dev->driver->dumb_create which we'd have to convert to some device specific dynamic thing.
Cc: stable@vger.kernel.org Reported-by: Mika Kuoppala mika.kuoppala@linux.intel.com Fixes: aa5ca8b7421c ("drm/i915: Align dumb buffer stride to 4k to allow for gtt remapping") Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com
drivers/gpu/drm/i915/display/intel_display.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index 1f93860fb897..331030765ca9 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -2543,6 +2543,9 @@ u32 intel_plane_fb_max_stride(struct drm_i915_private *dev_priv, * the highest stride limits of them all. */ crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_A);
if (!crtc)return 0;
Callers: intel_fb_max_stride -> intel_framebuffer_init, not used if no display intel_fb_stride_alignment, 0 -> intel_tile_size() alignment. ok -> intel_framebuffer_init, not used as no display
-> i915_gem_dumb_create -> args->pitch = PAGE_ALIGN()
Ok, not as horrible as I feared when I saw return 0 from max_stride!
Reviewed-by: Chris Wilson chris@chris-wilson.co.uk -Chris