drm/amdgpu: reduce RLC safe mode request for gfx clock gating

The driver can only request one time for the power safe mode instead of
polling and disabling the power feature each time prior to program the
GFX clock gating control registers. This update will reduce the latency
on the GFX clock gating entry.

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

2 files changed, 6 insertions, 20 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index af73f85527b7..6a025438f9d0 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -5639,8 +5639,6 @@ static void gfx_v8_0_update_medium_grain_clock_gating(struct amdgpu_device *adev
 {
 	uint32_t temp, data;
 
-	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
-
 	/* It is disabled by HW by default */
 	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_MGCG)) {
 		if (adev->cg_flags & AMD_CG_SUPPORT_GFX_MGLS) {
@@ -5734,8 +5732,6 @@ static void gfx_v8_0_update_medium_grain_clock_gating(struct amdgpu_device *adev
 		/* 7- wait for RLC_SERDES_CU_MASTER & RLC_SERDES_NONCU_MASTER idle */
 		gfx_v8_0_wait_for_rlc_serdes(adev);
 	}
-
-	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
 }
 
 static void gfx_v8_0_update_coarse_grain_clock_gating(struct amdgpu_device *adev,
@@ -5745,8 +5741,6 @@ static void gfx_v8_0_update_coarse_grain_clock_gating(struct amdgpu_device *adev
 
 	temp = data = RREG32(mmRLC_CGCG_CGLS_CTRL);
 
-	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
-
 	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_CGCG)) {
 		temp1 = data1 =	RREG32(mmRLC_CGTT_MGCG_OVERRIDE);
 		data1 &= ~RLC_CGTT_MGCG_OVERRIDE__CGCG_MASK;
@@ -5827,12 +5821,12 @@ static void gfx_v8_0_update_coarse_grain_clock_gating(struct amdgpu_device *adev
 	}
 
 	gfx_v8_0_wait_for_rlc_serdes(adev);
-
-	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
 }
 static int gfx_v8_0_update_gfx_clock_gating(struct amdgpu_device *adev,
 					    bool enable)
 {
+	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
+
 	if (enable) {
 		/* CGCG/CGLS should be enabled after MGCG/MGLS/TS(CG/LS)
 		 * ===  MGCG + MGLS + TS(CG/LS) ===
@@ -5846,6 +5840,8 @@ static int gfx_v8_0_update_gfx_clock_gating(struct amdgpu_device *adev,
 		gfx_v8_0_update_coarse_grain_clock_gating(adev, enable);
 		gfx_v8_0_update_medium_grain_clock_gating(adev, enable);
 	}
+
+	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 4b5006dc3d34..fa572b40989e 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -4964,8 +4964,6 @@ static void gfx_v9_0_update_medium_grain_clock_gating(struct amdgpu_device *adev
 {
 	uint32_t data, def;
 
-	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
-
 	/* It is disabled by HW by default */
 	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_MGCG)) {
 		/* 1 - RLC_CGTT_MGCG_OVERRIDE */
@@ -5030,8 +5028,6 @@ static void gfx_v9_0_update_medium_grain_clock_gating(struct amdgpu_device *adev
 			WREG32_SOC15(GC, 0, mmCP_MEM_SLP_CNTL, data);
 		}
 	}
-
-	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
 }
 
 static void gfx_v9_0_update_3d_clock_gating(struct amdgpu_device *adev,
@@ -5042,8 +5038,6 @@ static void gfx_v9_0_update_3d_clock_gating(struct amdgpu_device *adev,
 	if (!adev->gfx.num_gfx_rings)
 		return;
 
-	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
-
 	/* Enable 3D CGCG/CGLS */
 	if (enable) {
 		/* write cmd to clear cgcg/cgls ov */
@@ -5085,8 +5079,6 @@ static void gfx_v9_0_update_3d_clock_gating(struct amdgpu_device *adev,
 		if (def != data)
 			WREG32_SOC15(GC, 0, mmRLC_CGCG_CGLS_CTRL_3D, data);
 	}
-
-	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
 }
 
 static void gfx_v9_0_update_coarse_grain_clock_gating(struct amdgpu_device *adev,
@@ -5094,8 +5086,6 @@ static void gfx_v9_0_update_coarse_grain_clock_gating(struct amdgpu_device *adev
 {
 	uint32_t def, data;
 
-	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
-
 	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_CGCG)) {
 		def = data = RREG32_SOC15(GC, 0, mmRLC_CGTT_MGCG_OVERRIDE);
 		/* unset CGCG override */
@@ -5137,13 +5127,12 @@ static void gfx_v9_0_update_coarse_grain_clock_gating(struct amdgpu_device *adev
 		if (def != data)
 			WREG32_SOC15(GC, 0, mmRLC_CGCG_CGLS_CTRL, data);
 	}
-
-	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
 }
 
 static int gfx_v9_0_update_gfx_clock_gating(struct amdgpu_device *adev,
 					    bool enable)
 {
+	amdgpu_gfx_rlc_enter_safe_mode(adev, 0);
 	if (enable) {
 		/* CGCG/CGLS should be enabled after MGCG/MGLS
 		 * ===  MGCG + MGLS ===
@@ -5163,6 +5152,7 @@ static int gfx_v9_0_update_gfx_clock_gating(struct amdgpu_device *adev,
 		/* ===  MGCG + MGLS === */
 		gfx_v9_0_update_medium_grain_clock_gating(adev, enable);
 	}
+	amdgpu_gfx_rlc_exit_safe_mode(adev, 0);
 	return 0;
 }