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From:   Richard Gong <richard.gong@amd.com>
To:     <alexander.deucher@amd.com>, <christian.koenig@amd.com>,
        <xinhui.pan@amd.com>, <airlied@linux.ie>, <daniel@ffwll.ch>
CC:     <amd-gfx@lists.freedesktop.org>, <dri-devel@lists.freedesktop.org>,
        <linux-kernel@vger.kernel.org>, <mario.limonciello@amd.com>,
        <richard.gong@amd.com>, kernel test robot <lkp@intel.com>
Subject: [PATCHv4] drm/amdgpu: disable ASPM on Intel Alder Lake based systems
Date:   Tue, 12 Apr 2022 16:50:00 -0500
Message-ID: <20220412215000.897344-1-richard.gong@amd.com>
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Active State Power Management (ASPM) feature is enabled since kernel 5.14.
There are some AMD GFX cards (such as WX3200 and RX640) that won't work
with ASPM-enabled Intel Alder Lake based systems. Using these GFX cards as
video/display output, Intel Alder Lake based systems will hang during
suspend/resume.

The issue was initially reported on one system (Dell Precision 3660 with
BIOS version 0.14.81), but was later confirmed to affect at least 4 Alder
Lake based systems.

Add extra check to disable ASPM on Intel Alder Lake based systems.

Fixes: 0064b0ce85bb ("drm/amd/pm: enable ASPM by default")
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1885
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Richard Gong <richard.gong@amd.com>
---
v4: s/CONFIG_X86_64/CONFIG_X86
    enhanced check logic
v3: s/intel_core_asom_chk/aspm_support_quirk_check
    correct build error with W=1 option
v2: correct commit description
    move the check from chip family to problematic platform
---
 drivers/gpu/drm/amd/amdgpu/vi.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 039b90cdc3bc..b33e0a9bee65 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -81,6 +81,10 @@
 #include "mxgpu_vi.h"
 #include "amdgpu_dm.h"
 
+#if IS_ENABLED(CONFIG_X86)
+#include <asm/intel-family.h>
+#endif
+
 #define ixPCIE_LC_L1_PM_SUBSTATE	0x100100C6
 #define PCIE_LC_L1_PM_SUBSTATE__LC_L1_SUBSTATES_OVERRIDE_EN_MASK	0x00000001L
 #define PCIE_LC_L1_PM_SUBSTATE__LC_PCI_PM_L1_2_OVERRIDE_MASK	0x00000002L
@@ -1134,13 +1138,24 @@ static void vi_enable_aspm(struct amdgpu_device *adev)
 		WREG32_PCIE(ixPCIE_LC_CNTL, data);
 }
 
+static bool aspm_support_quirk_check(void)
+{
+	if (IS_ENABLED(CONFIG_X86)) {
+		struct cpuinfo_x86 *c = &cpu_data(0);
+
+		return !(c->x86 == 6 && c->x86_model == INTEL_FAM6_ALDERLAKE);
+	}
+
+	return true;
+}
+
 static void vi_program_aspm(struct amdgpu_device *adev)
 {
 	u32 data, data1, orig;
 	bool bL1SS = false;
 	bool bClkReqSupport = true;
 
-	if (!amdgpu_device_should_use_aspm(adev))
+	if (!amdgpu_device_should_use_aspm(adev) || !aspm_support_quirk_check())
 		return;
 
 	if (adev->flags & AMD_IS_APU ||
-- 
2.25.1