drm/i915: Don't oops in dumb_create ioctl if we have no crtcs

[platform/kernel/linux-rpi.git] / drivers / gpu / drm / i915 / display / intel_display.c

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index aa54bb2..62f9198 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -2504,6 +2504,9 @@ u32 intel_plane_fb_max_stride(struct drm_i915_private *dev_priv,
         * the highest stride limits of them all.
         */
        crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_A);
+       if (!crtc)
+               return 0;
+
        plane = to_intel_plane(crtc->base.primary);
 
        return plane->max_stride(plane, pixel_format, modifier,
@@ -9315,7 +9318,6 @@ static bool wrpll_uses_pch_ssc(struct drm_i915_private *dev_priv,
 static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv)
 {
        struct intel_encoder *encoder;
-       bool pch_ssc_in_use = false;
        bool has_fdi = false;
 
        for_each_intel_encoder(&dev_priv->drm, encoder) {
@@ -9343,22 +9345,24 @@ static void lpt_init_pch_refclk(struct drm_i915_private *dev_priv)
         * clock hierarchy. That would also allow us to do
         * clock bending finally.
         */
+       dev_priv->pch_ssc_use = 0;
+
        if (spll_uses_pch_ssc(dev_priv)) {
                DRM_DEBUG_KMS("SPLL using PCH SSC\n");
-               pch_ssc_in_use = true;
+               dev_priv->pch_ssc_use |= BIT(DPLL_ID_SPLL);
        }
 
        if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL1)) {
                DRM_DEBUG_KMS("WRPLL1 using PCH SSC\n");
-               pch_ssc_in_use = true;
+               dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL1);
        }
 
        if (wrpll_uses_pch_ssc(dev_priv, DPLL_ID_WRPLL2)) {
                DRM_DEBUG_KMS("WRPLL2 using PCH SSC\n");
-               pch_ssc_in_use = true;
+               dev_priv->pch_ssc_use |= BIT(DPLL_ID_WRPLL2);
        }
 
-       if (pch_ssc_in_use)
+       if (dev_priv->pch_ssc_use)
                return;
 
        if (has_fdi) {