On Tue, Jan 16, 2024 at 09:56:33AM +0200, Ville Syrjala wrote: > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > The "io" address of an object is its dma address minus the > region.start. Subtract the latter to make smem_start correct. > The current code happens to work for genuine LMEM objects > as LMEM region.start==0, but for LMEMBAR stolen objects > region.start!=0. > > TODO: perhaps just set smem_start=0 always as our .fb_mmap() > implementation no longer depends on it? Need to double check > it's not needed for anything else... > > Cc: Paz Zcharya <pazz@xxxxxxxxxxxx> > Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Hi Ville, Thank you so much for this incredible series. It solves the issue regarding MTL initial plane readout that Andrzej Hajda and I worked on in https://patchwork.freedesktop.org/patch/570811/?series=127130&rev=2 In addition, it solved the issue with the new GOP. I tested it on two different devices with Meteor Lake and it worked perfectly: no i915 errors, no flickers or observable issues. Tested-by: Paz Zcharya <pazz@xxxxxxxxxxxx> > --- > drivers/gpu/drm/i915/display/intel_fbdev_fb.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_fbdev_fb.c b/drivers/gpu/drm/i915/display/intel_fbdev_fb.c > index 1ac05d90b2e8..0665f943f65f 100644 > --- a/drivers/gpu/drm/i915/display/intel_fbdev_fb.c > +++ b/drivers/gpu/drm/i915/display/intel_fbdev_fb.c > @@ -79,7 +79,8 @@ int intel_fbdev_fb_fill_info(struct drm_i915_private *i915, struct fb_info *info > /* Use fbdev's framebuffer from lmem for discrete */ > info->fix.smem_start = > (unsigned long)(mem->io.start + > - i915_gem_object_get_dma_address(obj, 0)); > + i915_gem_object_get_dma_address(obj, 0) - > + mem->region.start); > info->fix.smem_len = obj->base.size; > } else { > struct i915_ggtt *ggtt = to_gt(i915)->ggtt; > -- > 2.41.0 >
