On Wed, 04 Jan 2023, Juha-Pekka Heikkila <juhapekka.heikkila@xxxxxxxxx> wrote:
> intel_adjusted_rate() didn't take into account src rectangle
> can be less than 1 in width or height.
>
> Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_atomic_plane.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> index 10e1fc9d0698..a9948e8d3543 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
> @@ -144,7 +144,7 @@ unsigned int intel_adjusted_rate(const struct drm_rect *src,
> const struct drm_rect *dst,
> unsigned int rate)
> {
> - unsigned int src_w, src_h, dst_w, dst_h;
> + unsigned int src_w, src_h, dst_w, dst_h, dst_wh;
>
> src_w = drm_rect_width(src) >> 16;
> src_h = drm_rect_height(src) >> 16;
> @@ -155,8 +155,10 @@ unsigned int intel_adjusted_rate(const struct drm_rect *src,
> dst_w = min(src_w, dst_w);
> dst_h = min(src_h, dst_h);
>
> - return DIV_ROUND_UP_ULL(mul_u32_u32(rate, src_w * src_h),
> - dst_w * dst_h);
> + /* in case src contained only fractional part */
> + dst_wh = max(dst_w * dst_h, (unsigned) 1);
The options are to use 1U or max_t(), but please don't cast the
parameters of max().
Side note, the explicit "unsigned int" is always preferred over the
implicit "unsigned".
BR,
Jani.
> +
> + return DIV_ROUND_UP_ULL(mul_u32_u32(rate, src_w * src_h), dst_wh);
> }
>
> unsigned int intel_plane_pixel_rate(const struct intel_crtc_state *crtc_state,
--
Jani Nikula, Intel Open Source Graphics Center
