drm/msm/a5xx: Skip hardware preemption init if no preemption

In the case where preemption is not enabled, this patch simply skips
preemption related initialization in hardware init sequence.

Signed-off-by: Sharat Masetty <smasetty@codeaurora.org>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
index 970c796..6a3c560 100644 (file)
--- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
@@ -208,6 +208,13 @@ void a5xx_preempt_hw_init(struct msm_gpu *gpu)
        struct a5xx_gpu *a5xx_gpu = to_a5xx_gpu(adreno_gpu);
        int i;
 
+       /* Always come up on rb 0 */
+       a5xx_gpu->cur_ring = gpu->rb[0];
+
+       /* No preemption if we only have one ring */
+       if (gpu->nr_rings == 1)
+               return;
+
        for (i = 0; i < gpu->nr_rings; i++) {
                a5xx_gpu->preempt[i]->wptr = 0;
                a5xx_gpu->preempt[i]->rptr = 0;
@@ -220,9 +227,6 @@ void a5xx_preempt_hw_init(struct msm_gpu *gpu)
 
        /* Reset the preemption state */
        set_preempt_state(a5xx_gpu, PREEMPT_NONE);
-
-       /* Always come up on rb 0 */
-       a5xx_gpu->cur_ring = gpu->rb[0];
 }
 
 static int preempt_init_ring(struct a5xx_gpu *a5xx_gpu,