On Tue, Apr 25, 2017 at 09:56:53PM +0200, Arnd Bergmann wrote:

On 32-bit machines, we can't divide 64-bit integers:

drivers/gpu/drm/arm/malidp_crtc.o: In function `malidp_crtc_atomic_check': malidp_crtc.c:(.text.malidp_crtc_atomic_check+0x3c0): undefined reference to `__aeabi_uldivmod' malidp_crtc.c:(.text.malidp_crtc_atomic_check+0x3dc): undefined reference to `__aeabi_uldivmod'

This calls the div_u64 function explicitly instead.

Fixes: 4cea4e9f6690 ("drm: mali-dp: Add plane upscaling support") Signed-off-by: Arnd Bergmann arnd@arndb.de

Acked-by: Liviu Dudau liviu.dudau@arm.com

I'll push the patch to the mali-dp repository. Dave A., if you have pulled the mali-dp patches then this will need to go in as well, otherwise I will send an updated pull request soon.

Best regards, Liviu

---

drivers/gpu/drm/arm/malidp_crtc.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/arm/malidp_crtc.c b/drivers/gpu/drm/arm/malidp_crtc.c index 19f1f3b34691..9446a673d469 100644 --- a/drivers/gpu/drm/arm/malidp_crtc.c +++ b/drivers/gpu/drm/arm/malidp_crtc.c @@ -266,7 +266,6 @@ static int malidp_crtc_atomic_check_scaling(struct drm_crtc *crtc,

drm_atomic_crtc_state_for_each_plane_state(plane, pstate, state) { struct malidp_plane *mp = to_malidp_plane(plane);

• u64 crtc_w, crtc_h;
  

  u32 phase;

  if (!(mp->layer->id & scaling))

@@ -276,10 +275,10 @@ static int malidp_crtc_atomic_check_scaling(struct drm_crtc *crtc, * Convert crtc_[w|h] to U32.32, then divide by U16.16 src_[w|h] * to get the U16.16 result. */

• crtc_w = (u64)pstate->crtc_w << 32;
  

• crtc_h = (u64)pstate->crtc_h << 32;
  

• h_upscale_factor = (u32)(crtc_w / pstate->src_w);
  

• v_upscale_factor = (u32)(crtc_h / pstate->src_h);
  

• h_upscale_factor = div_u64((u64)pstate->crtc_w << 32,
  

• 			   pstate->src_w);
  

• v_upscale_factor = div_u64((u64)pstate->crtc_h << 32,
  

• 			   pstate->src_h);
  
  

  s->enhancer_enable = ((h_upscale_factor >> 16) >= 2 || (v_upscale_factor >> 16) >= 2);

-- 2.9.0