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drm/i915: wait for rings to become idle once disabled 

make sure we wait for rings to become idle once they are
disabled. In case of timeout print an error message

Signed-off-by: Naresh Kumar Kachhi <naresh.kumar.kachhi@intel.com>
[danvet: Frob patch as suggested by Chris.]
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Naresh Kumar Kachhi 2014-03-12 16:39:41 +05:30 committed by Daniel Vetter
parent a51435a313
commit e9fea5747d
3 changed files with 6 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_reg.h
View File

@ -748,6 +748,7 @@ enum punit_power_well {
#define RING_INSTPS(base) ((base)+0x70)
#define RING_DMA_FADD(base) ((base)+0x78)
#define RING_INSTPM(base) ((base)+0xc0)
#define RING_MI_MODE(base) ((base)+0x9c)
#define INSTPS 0x02070 /* 965+ only */
#define INSTDONE1 0x0207c /* 965+ only */
#define ACTHD_I965 0x02074
@ -824,6 +825,7 @@ enum punit_power_well {
# define VS_TIMER_DISPATCH (1 << 6)
# define MI_FLUSH_ENABLE (1 << 12)
# define ASYNC_FLIP_PERF_DISABLE (1 << 14)
# define MODE_IDLE (1 << 9)
#define GEN6_GT_MODE 0x20d0
#define GEN7_GT_MODE 0x7008

2
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -444,6 +444,8 @@ static int init_ring_common(struct intel_ring_buffer *ring)
I915_WRITE_CTL(ring, 0);
I915_WRITE_HEAD(ring, 0);
ring->write_tail(ring, 0);
if (wait_for_atomic((I915_READ_MODE(ring) & MODE_IDLE) != 0, 1000))
DRM_ERROR("%s :timed out trying to stop ring\n", ring->name);
if (I915_NEED_GFX_HWS(dev))
intel_ring_setup_status_page(ring);

2
drivers/gpu/drm/i915/intel_ringbuffer.h
View File

@ -33,6 +33,8 @@ struct intel_hw_status_page {
#define I915_READ_IMR(ring) I915_READ(RING_IMR((ring)->mmio_base))
#define I915_WRITE_IMR(ring, val) I915_WRITE(RING_IMR((ring)->mmio_base), val)
#define I915_READ_MODE(ring) I915_READ(RING_MI_MODE((ring)->mmio_base))
enum intel_ring_hangcheck_action {
HANGCHECK_IDLE = 0,
HANGCHECK_WAIT,