linux-kernel - [PATCH 5.4 76/80] drm/amdgpu/gfx10: explicitly wait for cp idle after halt/unhalt

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Date:   Thu, 19 Dec 2019 19:35:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xiaojie Yuan <xiaojie.yuan@....com>,
        Jack Xiao <Jack.Xiao@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.4 76/80] drm/amdgpu/gfx10: explicitly wait for cp idle after halt/unhalt

From: Xiaojie Yuan <xiaojie.yuan@....com>

commit 1e902a6d32d73e4a6b3bc9d7cd43d4ee2b242dea upstream.

50us is not enough to wait for cp ready after gpu reset on some navi asics.

Signed-off-by: Xiaojie Yuan <xiaojie.yuan@....com>
Suggested-by: Jack Xiao <Jack.Xiao@....com>
Acked-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
@@ -2400,7 +2400,7 @@ static int gfx_v10_0_wait_for_rlc_autolo
 	return 0;
 }
 
-static void gfx_v10_0_cp_gfx_enable(struct amdgpu_device *adev, bool enable)
+static int gfx_v10_0_cp_gfx_enable(struct amdgpu_device *adev, bool enable)
 {
 	int i;
 	u32 tmp = RREG32_SOC15(GC, 0, mmCP_ME_CNTL);
@@ -2413,7 +2413,17 @@ static void gfx_v10_0_cp_gfx_enable(stru
 			adev->gfx.gfx_ring[i].sched.ready = false;
 	}
 	WREG32_SOC15(GC, 0, mmCP_ME_CNTL, tmp);
-	udelay(50);
+
+	for (i = 0; i < adev->usec_timeout; i++) {
+		if (RREG32_SOC15(GC, 0, mmCP_STAT) == 0)
+			break;
+		udelay(1);
+	}
+
+	if (i >= adev->usec_timeout)
+		DRM_ERROR("failed to %s cp gfx\n", enable ? "unhalt" : "halt");
+
+	return 0;
 }
 
 static int gfx_v10_0_cp_gfx_load_pfp_microcode(struct amdgpu_device *adev)