On Thu, 21 Aug 2025, Jouni Högander <jouni.hogan...@intel.com> wrote:
> Check drm_mode_vrefresh return value sanity before using it in
> intel_get_frame_time_us.
>
> Signed-off-by: Jouni Högander <jouni.hogan...@intel.com>
Reviewed-by: Jani Nikula <jani.nik...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_psr.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index 5addde63168e..8cc2314fac6f 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1116,11 +1116,16 @@ transcoder_has_psr2(struct intel_display *display,
> enum transcoder cpu_transcode
>
> static u32 intel_get_frame_time_us(const struct intel_crtc_state *crtc_state)
> {
> + int vrefresh;
> +
> if (!crtc_state->hw.active)
> return 0;
>
> - return DIV_ROUND_UP(1000 * 1000,
> - drm_mode_vrefresh(&crtc_state->hw.adjusted_mode));
> + vrefresh = drm_mode_vrefresh(&crtc_state->hw.adjusted_mode);
> + if (vrefresh <= 0)
> + return 0;
> +
> + return DIV_ROUND_UP(1000 * 1000, vrefresh);
> }
>
> static void psr2_program_idle_frames(struct intel_dp *intel_dp,
--
Jani Nikula, Intel
