drm/i915/dp: prevent potential div-by-zero

[platform/kernel/linux-starfive.git] / drivers / gpu / drm / i915 / display / intel_dp.c

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index f0bace9..529ee22 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1601,6 +1601,11 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
                pipe_config->dsc.slice_count =
                        drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd,
                                                        true);
+               if (!pipe_config->dsc.slice_count) {
+                       drm_dbg_kms(&dev_priv->drm, "Unsupported Slice Count %d\n",
+                                   pipe_config->dsc.slice_count);
+                       return -EINVAL;
+               }
        } else {
                u16 dsc_max_output_bpp = 0;
                u8 dsc_dp_slice_count;