drm/i915: add media well to VLV force wake routines v2

We could split this out into a separate routine at some point as an
optimization.

v2: use FORCEWAKE_KERNEL (Ville)

Note: Ville mentioned in his review that he declines to be responsible
if this blows up due to the lack of "readback a register != FW_ACK,
but from the same cacheline" magic we have in other forcewake
implementations.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Bikeshed overtly long lines according to checkpatch.pl. Nope,
this time around I didn't screw up printk message since I've left
those alone.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 176cf5c..17cb78f 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4148,6 +4148,8 @@
 #define  FORCEWAKE                             0xA18C
 #define  FORCEWAKE_VLV                         0x1300b0
 #define  FORCEWAKE_ACK_VLV                     0x1300b4
+#define  FORCEWAKE_MEDIA_VLV                   0x1300b8
+#define  FORCEWAKE_ACK_MEDIA_VLV               0x1300bc
 #define  FORCEWAKE_ACK_HSW                     0x130044
 #define  FORCEWAKE_ACK                         0x130090
 #define  VLV_GTLC_WAKE_CTRL                    0x130090

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c30e89a..52d4f2d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4404,10 +4404,17 @@ static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
                DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
 
        I915_WRITE_NOTRACE(FORCEWAKE_VLV, _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
+       I915_WRITE_NOTRACE(FORCEWAKE_MEDIA_VLV,
+                          _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
 
        if (wait_for_atomic((I915_READ_NOTRACE(FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL),
                            FORCEWAKE_ACK_TIMEOUT_MS))
-               DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
+               DRM_ERROR("Timed out waiting for GT to ack forcewake request.\n");
+
+       if (wait_for_atomic((I915_READ_NOTRACE(FORCEWAKE_ACK_MEDIA_VLV) &
+                            FORCEWAKE_KERNEL),
+                           FORCEWAKE_ACK_TIMEOUT_MS))
+               DRM_ERROR("Timed out waiting for media to ack forcewake request.\n");
 
        __gen6_gt_wait_for_thread_c0(dev_priv);
 }
@@ -4415,8 +4422,9 @@ static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
 static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
 {
        I915_WRITE_NOTRACE(FORCEWAKE_VLV, _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
-       /* something from same cacheline, but !FORCEWAKE_VLV */
-       POSTING_READ(FORCEWAKE_ACK_VLV);
+       I915_WRITE_NOTRACE(FORCEWAKE_MEDIA_VLV,
+                          _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
+       /* The below doubles as a POSTING_READ */
        gen6_gt_check_fifodbg(dev_priv);
 }