drm/msm: spin helper
Helper macro to simplify places where we need to poll with timeout
waiting for gpu.
Signed-off-by: Rob Clark <robdclark@gmail.com>
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index cf6eb97..7a11563 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -225,19 +225,11 @@
void adreno_idle(struct msm_gpu *gpu)
{
struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
- uint32_t rptr, wptr = get_wptr(gpu->rb);
- unsigned long t;
+ uint32_t wptr = get_wptr(gpu->rb);
- t = jiffies + ADRENO_IDLE_TIMEOUT;
-
- /* then wait for CP to drain ringbuffer: */
- do {
- rptr = adreno_gpu->memptrs->rptr;
- if (rptr == wptr)
- return;
- } while(time_before(jiffies, t));
-
- DRM_ERROR("%s: timeout waiting to drain ringbuffer!\n", gpu->name);
+ /* wait for CP to drain ringbuffer: */
+ if (spin_until(adreno_gpu->memptrs->rptr == wptr))
+ DRM_ERROR("%s: timeout waiting to drain ringbuffer!\n", gpu->name);
/* TODO maybe we need to reset GPU here to recover from hang? */
}
@@ -278,22 +270,19 @@
}
-void adreno_wait_ring(struct msm_gpu *gpu, uint32_t ndwords)
+static uint32_t ring_freewords(struct msm_gpu *gpu)
{
struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
- uint32_t freedwords;
- unsigned long t = jiffies + ADRENO_IDLE_TIMEOUT;
- do {
- uint32_t size = gpu->rb->size / 4;
- uint32_t wptr = get_wptr(gpu->rb);
- uint32_t rptr = adreno_gpu->memptrs->rptr;
- freedwords = (rptr + (size - 1) - wptr) % size;
+ uint32_t size = gpu->rb->size / 4;
+ uint32_t wptr = get_wptr(gpu->rb);
+ uint32_t rptr = adreno_gpu->memptrs->rptr;
+ return (rptr + (size - 1) - wptr) % size;
+}
- if (time_after(jiffies, t)) {
- DRM_ERROR("%s: timeout waiting for ringbuffer space\n", gpu->name);
- break;
- }
- } while(freedwords < ndwords);
+void adreno_wait_ring(struct msm_gpu *gpu, uint32_t ndwords)
+{
+ if (spin_until(ring_freewords(gpu) >= ndwords))
+ DRM_ERROR("%s: timeout waiting for ringbuffer space\n", gpu->name);
}
static const char *iommu_ports[] = {