[Freedreno] [PATCH] drm/msm/a6xx: Avoid gx gbit halt during rpm suspend

[Akhil P Oommen]

As per the downstream driver, gx gbif halt is required only during
recovery sequence. So lets avoid it during regular rpm suspend.

Signed-off-by: Akhil P Oommen <quic_akhi...@quicinc.com>
---

 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 15 +++++++++------
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c |  7 +++++++
 drivers/gpu/drm/msm/adreno/a6xx_gpu.h |  1 +
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c 
b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index e033d6a67a20..870252bef23f 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -876,7 +876,8 @@ static void a6xx_gmu_rpmh_off(struct a6xx_gmu *gmu)
 #define GBIF_CLIENT_HALT_MASK             BIT(0)
 #define GBIF_ARB_HALT_MASK                BIT(1)
 
-static void a6xx_bus_clear_pending_transactions(struct adreno_gpu *adreno_gpu)
+static void a6xx_bus_clear_pending_transactions(struct adreno_gpu *adreno_gpu,
+               bool gx_off)
 {
        struct msm_gpu *gpu = &adreno_gpu->base;
 
@@ -889,9 +890,11 @@ static void a6xx_bus_clear_pending_transactions(struct 
adreno_gpu *adreno_gpu)
                return;
        }
 
-       /* Halt the gx side of GBIF */
-       gpu_write(gpu, REG_A6XX_RBBM_GBIF_HALT, 1);
-       spin_until(gpu_read(gpu, REG_A6XX_RBBM_GBIF_HALT_ACK) & 1);
+       if (gx_off) {
+               /* Halt the gx side of GBIF */
+               gpu_write(gpu, REG_A6XX_RBBM_GBIF_HALT, 1);
+               spin_until(gpu_read(gpu, REG_A6XX_RBBM_GBIF_HALT_ACK) & 1);
+       }
 
        /* Halt new client requests on GBIF */
        gpu_write(gpu, REG_A6XX_GBIF_HALT, GBIF_CLIENT_HALT_MASK);
@@ -929,7 +932,7 @@ static void a6xx_gmu_force_off(struct a6xx_gmu *gmu)
        /* Halt the gmu cm3 core */
        gmu_write(gmu, REG_A6XX_GMU_CM3_SYSRESET, 1);
 
-       a6xx_bus_clear_pending_transactions(adreno_gpu);
+       a6xx_bus_clear_pending_transactions(adreno_gpu, true);
 
        /* Reset GPU core blocks */
        gpu_write(gpu, REG_A6XX_RBBM_SW_RESET_CMD, 1);
@@ -1083,7 +1086,7 @@ static void a6xx_gmu_shutdown(struct a6xx_gmu *gmu)
                        return;
                }
 
-               a6xx_bus_clear_pending_transactions(adreno_gpu);
+               a6xx_bus_clear_pending_transactions(adreno_gpu, a6xx_gpu->hung);
 
                /* tell the GMU we want to slumber */
                ret = a6xx_gmu_notify_slumber(gmu);
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c 
b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index e495d8e192db..cdce27adbd03 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -1270,6 +1270,12 @@ static void a6xx_recover(struct msm_gpu *gpu)
        if (hang_debug)
                a6xx_dump(gpu);
 
+       /*
+        * To handle recovery specific sequences during the rpm suspend we are
+        * about to trigger
+        */
+       a6xx_gpu->hung = true;
+
        /* Halt SQE first */
        gpu_write(gpu, REG_A6XX_CP_SQE_CNTL, 3);
 
@@ -1312,6 +1318,7 @@ static void a6xx_recover(struct msm_gpu *gpu)
        mutex_unlock(&gpu->active_lock);
 
        msm_gpu_hw_init(gpu);
+       a6xx_gpu->hung = false;
 }
 
 static const char *a6xx_uche_fault_block(struct msm_gpu *gpu, u32 mid)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h 
b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
index ab853f61db63..eea2e60ce3b7 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h
@@ -32,6 +32,7 @@ struct a6xx_gpu {
        void *llc_slice;
        void *htw_llc_slice;
        bool have_mmu500;
+       bool hung;
 };
 
 #define to_a6xx_gpu(x) container_of(x, struct a6xx_gpu, base)
-- 
2.7.4