[PATCH 02/21] drm/amdgpu: doorbell registers need only be set once v2

[andresx7@xxxxxxxxx (Andres Rodriguez)]

The CP_MEC_DOORBELL_RANGE_* and CP_PQ_STATUS.DOORBELL_ENABLE registers
are not HQD specific.

They only need to be set once if at least 1 pipe requested doorbell
support.

v2: move doorbell_enable to amdgpu_gfx instead of amdgpu_device

Signed-off-by: Andres Rodriguez <andresx7 at gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h   | 3 +++
 drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index c1b9135..b577ec1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -892,20 +892,23 @@ struct amdgpu_gfx {
 	/* gfx status */
 	uint32_t			gfx_current_status;
 	/* ce ram size*/
 	unsigned			ce_ram_size;
 	struct amdgpu_cu_info		cu_info;
 	const struct amdgpu_gfx_funcs	*funcs;
 
 	/* reset mask */
 	uint32_t                        grbm_soft_reset;
 	uint32_t                        srbm_soft_reset;
+
+	/* doorbell */
+	bool				doorbell_enabled;
 };
 
 int amdgpu_ib_get(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		  unsigned size, struct amdgpu_ib *ib);
 void amdgpu_ib_free(struct amdgpu_device *adev, struct amdgpu_ib *ib,
 		    struct dma_fence *f);
 int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 		       struct amdgpu_ib *ibs, struct amdgpu_job *job,
 		       struct dma_fence **f);
 int amdgpu_ib_pool_init(struct amdgpu_device *adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index 1c8589a..044449a 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -4797,35 +4797,37 @@ static int gfx_v8_0_mqd_deactivate(struct amdgpu_device *adev)
 		WREG32(mmCP_HQD_PQ_WPTR, 0);
 	}
 
 	return 0;
 }
 
 static void gfx_v8_0_enable_doorbell(struct amdgpu_device *adev, bool enable)
 {
 	uint32_t tmp;
 
-	if (!enable)
+	if (!enable || adev->gfx.doorbell_enabled)
 		return;
 
 	if ((adev->asic_type == CHIP_CARRIZO) ||
 			(adev->asic_type == CHIP_FIJI) ||
 			(adev->asic_type == CHIP_STONEY) ||
 			(adev->asic_type == CHIP_POLARIS11) ||
 			(adev->asic_type == CHIP_POLARIS10)) {
 		WREG32(mmCP_MEC_DOORBELL_RANGE_LOWER, AMDGPU_DOORBELL_KIQ << 2);
 		WREG32(mmCP_MEC_DOORBELL_RANGE_UPPER, AMDGPU_DOORBELL_MEC_RING7 << 2);
 	}
 
 	tmp = RREG32(mmCP_PQ_STATUS);
 	tmp = REG_SET_FIELD(tmp, CP_PQ_STATUS, DOORBELL_ENABLE, 1);
 	WREG32(mmCP_PQ_STATUS, tmp);
+
+	adev->gfx.doorbell_enabled = true;
 }
 
 static int gfx_v8_0_mqd_commit(struct amdgpu_device *adev, struct vi_mqd *mqd)
 {
 	uint32_t tmp;
 
 	/* disable wptr polling */
 	tmp = RREG32(mmCP_PQ_WPTR_POLL_CNTL);
 	tmp = REG_SET_FIELD(tmp, CP_PQ_WPTR_POLL_CNTL, EN, 0);
 	WREG32(mmCP_PQ_WPTR_POLL_CNTL, tmp);
@@ -5109,20 +5111,22 @@ static int gfx_v8_0_cp_compute_resume(struct amdgpu_device *adev)
 			ring->ready = false;
 	}
 
 	return 0;
 }
 
 static int gfx_v8_0_cp_resume(struct amdgpu_device *adev)
 {
 	int r;
 
+	adev->gfx.doorbell_enabled = false;
+
 	if (!(adev->flags & AMD_IS_APU))
 		gfx_v8_0_enable_gui_idle_interrupt(adev, false);
 
 	if (!adev->pp_enabled) {
 		if (!adev->firmware.smu_load) {
 			/* legacy firmware loading */
 			r = gfx_v8_0_cp_gfx_load_microcode(adev);
 			if (r)
 				return r;
 
-- 
2.9.3