From: cstout cstout@google.com
As described in the downstream/kgsl driver: Sometimes the RPTR shadow memory is unreliable causing timeouts in adreno_idle(). Read it directly from the register instead.
Change-Id: I1617a670e1da0ae25528c37f3424654d5bedd169 --- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 34 +++++++++++++++++++++------------ 1 file changed, 22 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c index 0e76a21..95e582e 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c @@ -68,18 +68,15 @@ int adreno_hw_init(struct msm_gpu *gpu) adreno_gpu_write(adreno_gpu, REG_ADRENO_CP_RB_CNTL, /* size is log2(quad-words): */ AXXX_CP_RB_CNTL_BUFSZ(ilog2(gpu->rb->size / 8)) | - AXXX_CP_RB_CNTL_BLKSZ(ilog2(RB_BLKSIZE / 8))); + AXXX_CP_RB_CNTL_BLKSZ(ilog2(RB_BLKSIZE / 8)) | + (adreno_is_a430(adreno_gpu) ? AXXX_CP_RB_CNTL_NO_UPDATE : 0));
/* Setup ringbuffer address: */ adreno_gpu_write(adreno_gpu, REG_ADRENO_CP_RB_BASE, gpu->rb_iova); - adreno_gpu_write(adreno_gpu, REG_ADRENO_CP_RB_RPTR_ADDR, - rbmemptr(adreno_gpu, rptr));
- /* Setup scratch/timestamp: */ - adreno_gpu_write(adreno_gpu, REG_ADRENO_SCRATCH_ADDR, - rbmemptr(adreno_gpu, fence)); - - adreno_gpu_write(adreno_gpu, REG_ADRENO_SCRATCH_UMSK, 0x1); + if (!adreno_is_a430(adreno_gpu)) + adreno_gpu_write(adreno_gpu, REG_ADRENO_CP_RB_RPTR_ADDR, + rbmemptr(adreno_gpu, rptr));
return 0; } @@ -89,6 +86,16 @@ static uint32_t get_wptr(struct msm_ringbuffer *ring) return ring->cur - ring->start; }
+/* Use this helper to read rptr, since a430 doesn't update rptr in memory */ +static uint32_t get_rptr(struct adreno_gpu *adreno_gpu) +{ + if (adreno_is_a430(adreno_gpu)) + return adreno_gpu->memptrs->rptr = adreno_gpu_read( + adreno_gpu, REG_ADRENO_CP_RB_RPTR); + else + return adreno_gpu->memptrs->rptr; +} + uint32_t adreno_last_fence(struct msm_gpu *gpu) { struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); @@ -217,9 +224,12 @@ void adreno_idle(struct msm_gpu *gpu) { struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); uint32_t wptr = get_wptr(gpu->rb); + int ret;
/* wait for CP to drain ringbuffer: */ - if (spin_until(adreno_gpu->memptrs->rptr == wptr)) + ret = spin_until(get_rptr(adreno_gpu) == wptr); + + if (ret) DRM_ERROR("%s: timeout waiting to drain ringbuffer!\n", gpu->name);
/* TODO maybe we need to reset GPU here to recover from hang? */ @@ -238,7 +248,7 @@ void adreno_show(struct msm_gpu *gpu, struct seq_file *m)
seq_printf(m, "fence: %d/%d\n", adreno_gpu->memptrs->fence, gpu->submitted_fence); - seq_printf(m, "rptr: %d\n", adreno_gpu->memptrs->rptr); + seq_printf(m, "rptr: %d\n", get_rptr(adreno_gpu)); seq_printf(m, "wptr: %d\n", adreno_gpu->memptrs->wptr); seq_printf(m, "rb wptr: %d\n", get_wptr(gpu->rb));
@@ -279,7 +289,7 @@ void adreno_dump_info(struct msm_gpu *gpu)
printk("fence: %d/%d\n", adreno_gpu->memptrs->fence, gpu->submitted_fence); - printk("rptr: %d\n", adreno_gpu->memptrs->rptr); + printk("rptr: %d\n", get_rptr(adreno_gpu)); printk("wptr: %d\n", adreno_gpu->memptrs->wptr); printk("rb wptr: %d\n", get_wptr(gpu->rb));
@@ -314,7 +324,7 @@ static uint32_t ring_freewords(struct msm_gpu *gpu) struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); uint32_t size = gpu->rb->size / 4; uint32_t wptr = get_wptr(gpu->rb); - uint32_t rptr = adreno_gpu->memptrs->rptr; + uint32_t rptr = get_rptr(adreno_gpu); return (rptr + (size - 1) - wptr) % size; }