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>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
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
