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path: root/drivers/gpu/drm/i915/intel_pm.c
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Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
-rw-r--r--drivers/gpu/drm/i915/intel_pm.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 245f0022bcfd..3fe358db1276 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2493,6 +2493,9 @@ static uint32_t ilk_compute_pri_wm(const struct intel_crtc_state *cstate,
uint32_t method1, method2;
int cpp;
+ if (mem_value == 0)
+ return U32_MAX;
+
if (!intel_wm_plane_visible(cstate, pstate))
return 0;
@@ -2522,6 +2525,9 @@ static uint32_t ilk_compute_spr_wm(const struct intel_crtc_state *cstate,
uint32_t method1, method2;
int cpp;
+ if (mem_value == 0)
+ return U32_MAX;
+
if (!intel_wm_plane_visible(cstate, pstate))
return 0;
@@ -2545,6 +2551,9 @@ static uint32_t ilk_compute_cur_wm(const struct intel_crtc_state *cstate,
{
int cpp;
+ if (mem_value == 0)
+ return U32_MAX;
+
if (!intel_wm_plane_visible(cstate, pstate))
return 0;
@@ -3008,6 +3017,34 @@ static void snb_wm_latency_quirk(struct drm_i915_private *dev_priv)
intel_print_wm_latency(dev_priv, "Cursor", dev_priv->wm.cur_latency);
}
+static void snb_wm_lp3_irq_quirk(struct drm_i915_private *dev_priv)
+{
+ /*
+ * On some SNB machines (Thinkpad X220 Tablet at least)
+ * LP3 usage can cause vblank interrupts to be lost.
+ * The DEIIR bit will go high but it looks like the CPU
+ * never gets interrupted.
+ *
+ * It's not clear whether other interrupt source could
+ * be affected or if this is somehow limited to vblank
+ * interrupts only. To play it safe we disable LP3
+ * watermarks entirely.
+ */
+ if (dev_priv->wm.pri_latency[3] == 0 &&
+ dev_priv->wm.spr_latency[3] == 0 &&
+ dev_priv->wm.cur_latency[3] == 0)
+ return;
+
+ dev_priv->wm.pri_latency[3] = 0;
+ dev_priv->wm.spr_latency[3] = 0;
+ dev_priv->wm.cur_latency[3] = 0;
+
+ DRM_DEBUG_KMS("LP3 watermarks disabled due to potential for lost interrupts\n");
+ intel_print_wm_latency(dev_priv, "Primary", dev_priv->wm.pri_latency);
+ intel_print_wm_latency(dev_priv, "Sprite", dev_priv->wm.spr_latency);
+ intel_print_wm_latency(dev_priv, "Cursor", dev_priv->wm.cur_latency);
+}
+
static void ilk_setup_wm_latency(struct drm_i915_private *dev_priv)
{
intel_read_wm_latency(dev_priv, dev_priv->wm.pri_latency);
@@ -3024,8 +3061,10 @@ static void ilk_setup_wm_latency(struct drm_i915_private *dev_priv)
intel_print_wm_latency(dev_priv, "Sprite", dev_priv->wm.spr_latency);
intel_print_wm_latency(dev_priv, "Cursor", dev_priv->wm.cur_latency);
- if (IS_GEN6(dev_priv))
+ if (IS_GEN6(dev_priv)) {
snb_wm_latency_quirk(dev_priv);
+ snb_wm_lp3_irq_quirk(dev_priv);
+ }
}
static void skl_setup_wm_latency(struct drm_i915_private *dev_priv)