[PATCH] drm/amdgpu: drop duplicated ecc check for vega10 (v3)

[Zhang, Hawking]

[AMD Public Use]

BTW, this workaround is actually used to fix vbios issue that the partial writes was enabled on board without ECC capability and result to performance drop. I don't think this is related to parity check or something. So the comment inline is also not correct.

Regards,
Hawking

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Zhang, Hawking
Sent: Tuesday, September 29, 2020 16:31
To: Chen, Guchun <Guchun.Chen at amd.com>; amd-gfx at lists.freedesktop.org; Deucher, Alexander <Alexander.Deucher at amd.com>; Li, Dennis <Dennis.Li at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>; Clements, John <John.Clements at amd.com>
Subject: RE: [PATCH] drm/amdgpu: drop duplicated ecc check for vega10 (v3)

[AMD Public Use]

+		if (adev->ras_features & (1 << AMDGPU_RAS_BLOCK__UMC)) {
 			if (adev->df.funcs->enable_ecc_force_par_wr_rmw)
 				adev->df.funcs->enable_ecc_force_par_wr_rmw(adev, false);

Hmm... this is still not correct. If the UMC ECC is enabled, we don't need to apply the workaround.

Regards,
Hawking
-----Original Message-----
From: Chen, Guchun <Guchun.Chen at amd.com> 
Sent: Tuesday, September 29, 2020 14:53
To: amd-gfx at lists.freedesktop.org; Deucher, Alexander <Alexander.Deucher at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>; Li, Dennis <Dennis.Li at amd.com>; Zhou1, Tao <Tao.Zhou1 at amd.com>; Clements, John <John.Clements at amd.com>
Cc: Chen, Guchun <Guchun.Chen at amd.com>
Subject: [PATCH] drm/amdgpu: drop duplicated ecc check for vega10 (v3)

The same ECC check has been executed in amdgpu_ras_init for vega10, prior to gmc_v9_0_late_init.

v2: drop all atombios helper callings
v3: use bit operation

Signed-off-by: Guchun Chen <guchun.chen at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 3dddbc60fe3d..9599946e4bee 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1193,21 +1193,13 @@ static int gmc_v9_0_late_init(void *handle)
 	r = amdgpu_gmc_allocate_vm_inv_eng(adev);
 	if (r)
 		return r;
-	/* Check if ecc is available */
+
+	/* apply DF parity workaround */
 	if (!amdgpu_sriov_vf(adev) && (adev->asic_type == CHIP_VEGA10)) {
-		r = amdgpu_atomfirmware_mem_ecc_supported(adev);
-		if (!r) {
-			DRM_INFO("ECC is not present.\n");
+		if (adev->ras_features & (1 << AMDGPU_RAS_BLOCK__UMC)) {
 			if (adev->df.funcs->enable_ecc_force_par_wr_rmw)
 				adev->df.funcs->enable_ecc_force_par_wr_rmw(adev, false);
-		} else
-			DRM_INFO("ECC is active.\n");
-
-		r = amdgpu_atomfirmware_sram_ecc_supported(adev);
-		if (!r)
-			DRM_INFO("SRAM ECC is not present.\n");
-		else
-			DRM_INFO("SRAM ECC is active.\n");
+		}
 	}
 
 	if (adev->mmhub.funcs && adev->mmhub.funcs->reset_ras_error_count)
--
2.17.1
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