drm/i915/ringbuffer: Write the value passed in to the tail register

This should fix the error along the reset path were we tried to clear the
tail register by setting it to 0, but were in fact setting it to the
current value and complaining when it did not reset to 0.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 0c6eb97d60fddf6d1e355862768c83b80e969934..4b53ca81ea4d07649e84142162f3117aa3f0007d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -119,12 +119,12 @@ render_ring_flush(struct drm_device *dev,
        }
 }
 
-static void ring_set_tail(struct drm_device *dev,
-                         struct intel_ring_buffer *ring,
-                         u32 value)
+static void ring_write_tail(struct drm_device *dev,
+                           struct intel_ring_buffer *ring,
+                           u32 value)
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
-       I915_WRITE_TAIL(ring, ring->tail);
+       I915_WRITE_TAIL(ring, value);
 }
 
 u32 intel_ring_get_active_head(struct drm_device *dev,
@@ -148,7 +148,7 @@ static int init_ring_common(struct drm_device *dev,
        /* Stop the ring if it's running. */
        I915_WRITE_CTL(ring, 0);
        I915_WRITE_HEAD(ring, 0);
-       ring->set_tail(dev, ring, 0);
+       ring->write_tail(dev, ring, 0);
 
        /* Initialize the ring. */
        I915_WRITE_START(ring, obj_priv->gtt_offset);
@@ -729,7 +729,7 @@ void intel_ring_advance(struct drm_device *dev,
                        struct intel_ring_buffer *ring)
 {
        ring->tail &= ring->size - 1;
-       ring->set_tail(dev, ring, ring->tail);
+       ring->write_tail(dev, ring, ring->tail);
 }
 
 static const struct intel_ring_buffer render_ring = {
@@ -738,7 +738,7 @@ static const struct intel_ring_buffer render_ring = {
        .mmio_base              = RENDER_RING_BASE,
        .size                   = 32 * PAGE_SIZE,
        .init                   = init_render_ring,
-       .set_tail               = ring_set_tail,
+       .write_tail             = ring_write_tail,
        .flush                  = render_ring_flush,
        .add_request            = render_ring_add_request,
        .get_seqno              = render_ring_get_seqno,
@@ -755,7 +755,7 @@ static const struct intel_ring_buffer bsd_ring = {
        .mmio_base              = BSD_RING_BASE,
        .size                   = 32 * PAGE_SIZE,
        .init                   = init_bsd_ring,
-       .set_tail               = ring_set_tail,
+       .write_tail             = ring_write_tail,
        .flush                  = bsd_ring_flush,
        .add_request            = ring_add_request,
        .get_seqno              = ring_status_page_get_seqno,
@@ -765,9 +765,9 @@ static const struct intel_ring_buffer bsd_ring = {
 };
 
 
-static void gen6_bsd_ring_set_tail(struct drm_device *dev,
-                                  struct intel_ring_buffer *ring,
-                                  u32 value)
+static void gen6_bsd_ring_write_tail(struct drm_device *dev,
+                                    struct intel_ring_buffer *ring,
+                                    u32 value)
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
 
@@ -829,7 +829,7 @@ static const struct intel_ring_buffer gen6_bsd_ring = {
        .mmio_base              = GEN6_BSD_RING_BASE,
        .size                   = 32 * PAGE_SIZE,
        .init                   = init_bsd_ring,
-       .set_tail               = gen6_bsd_ring_set_tail,
+       .write_tail             = gen6_bsd_ring_write_tail,
        .flush                  = gen6_ring_flush,
        .add_request            = ring_add_request,
        .get_seqno              = ring_status_page_get_seqno,
@@ -859,7 +859,7 @@ static const struct intel_ring_buffer gen6_blt_ring = {
        .mmio_base              = BLT_RING_BASE,
        .size                   = 32 * PAGE_SIZE,
        .init                   = init_ring_common,
-       .set_tail               = ring_set_tail,
+       .write_tail             = ring_write_tail,
        .flush                  = gen6_ring_flush,
        .add_request            = ring_add_request,
        .get_seqno              = ring_status_page_get_seqno,

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 9e81ff3b39cd2583c07e525d0f17a6e514bdee99..6ab40c6058f7961bff84c6ce0ddd4b5ea959d91a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -46,9 +46,9 @@ struct  intel_ring_buffer {
        int             (*init)(struct drm_device *dev,
                        struct intel_ring_buffer *ring);
 
-       void            (*set_tail)(struct drm_device *dev,
-                                   struct intel_ring_buffer *ring,
-                                   u32 value);
+       void            (*write_tail)(struct drm_device *dev,
+                                     struct intel_ring_buffer *ring,
+                                     u32 value);
        void            (*flush)(struct drm_device *dev,
                        struct intel_ring_buffer *ring,
                        u32     invalidate_domains,