[PATCH 3/3] drm/amd: Explicitly disable ASPM when dynamic switching disabled

[Mario Limonciello]

Currently there are separate but related checks:
* amdgpu_device_should_use_aspm()
* amdgpu_device_aspm_support_quirk()
* amdgpu_device_pcie_dynamic_switching_supported()

Simplify into checking whether DPM was enabled or not in the auto
case.  This works because amdgpu_device_pcie_dynamic_switching_supported()
populates that value.

Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  2 --
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 21 ++++++---------------
 drivers/gpu/drm/amd/amdgpu/nv.c            |  7 +++----
 drivers/gpu/drm/amd/amdgpu/vi.c            |  2 +-
 4 files changed, 10 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 44df1a5bce7f..c1c98bd2d489 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1339,9 +1339,7 @@ void amdgpu_device_pci_config_reset(struct amdgpu_device *adev);
 int amdgpu_device_pci_reset(struct amdgpu_device *adev);
 bool amdgpu_device_need_post(struct amdgpu_device *adev);
 bool amdgpu_device_seamless_boot_supported(struct amdgpu_device *adev);
-bool amdgpu_device_pcie_dynamic_switching_supported(void);
 bool amdgpu_device_should_use_aspm(struct amdgpu_device *adev);
-bool amdgpu_device_aspm_support_quirk(void);
 
 void amdgpu_cs_report_moved_bytes(struct amdgpu_device *adev, u64 num_bytes,
 				  u64 num_vis_bytes);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 4e144be7f044..7ec32b44df05 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1456,14 +1456,14 @@ bool amdgpu_device_seamless_boot_supported(struct amdgpu_device *adev)
 }
 
 /*
- * Intel hosts such as Raptor Lake and Sapphire Rapids don't support dynamic
- * speed switching. Until we have confirmation from Intel that a specific host
- * supports it, it's safer that we keep it disabled for all.
+ * Intel hosts such as Rocket Lake, Alder Lake, Raptor Lake and Sapphire Rapids
+ * don't support dynamic speed switching. Until we have confirmation from Intel
+ * that a specific host supports it, it's safer that we keep it disabled for all.
  *
  * https://edc.intel.com/content/www/us/en/design/products/platforms/details/raptor-lake-s/13th-generation-core-processors-datasheet-volume-1-of-2/005/pci-express-support/
  * https://gitlab.freedesktop.org/drm/amd/-/issues/2663
  */
-bool amdgpu_device_pcie_dynamic_switching_supported(void)
+static bool amdgpu_device_pcie_dynamic_switching_supported(void)
 {
 #if IS_ENABLED(CONFIG_X86)
 	struct cpuinfo_x86 *c = &cpu_data(0);
@@ -1498,20 +1498,11 @@ bool amdgpu_device_should_use_aspm(struct amdgpu_device *adev)
 	}
 	if (adev->flags & AMD_IS_APU)
 		return false;
+	if (!(adev->pm.pp_feature & PP_PCIE_DPM_MASK))
+		return false;
 	return pcie_aspm_enabled(adev->pdev);
 }
 
-bool amdgpu_device_aspm_support_quirk(void)
-{
-#if IS_ENABLED(CONFIG_X86)
-	struct cpuinfo_x86 *c = &cpu_data(0);
-
-	return !(c->x86 == 6 && c->x86_model == INTEL_FAM6_ALDERLAKE);
-#else
-	return true;
-#endif
-}
-
 /* if we get transitioned to only one device, take VGA back */
 /**
  * amdgpu_device_vga_set_decode - enable/disable vga decode
diff --git a/drivers/gpu/drm/amd/amdgpu/nv.c b/drivers/gpu/drm/amd/amdgpu/nv.c
index 9fa220de1490..4d7976b77767 100644
--- a/drivers/gpu/drm/amd/amdgpu/nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/nv.c
@@ -513,7 +513,7 @@ static int nv_set_vce_clocks(struct amdgpu_device *adev, u32 evclk, u32 ecclk)
 
 static void nv_program_aspm(struct amdgpu_device *adev)
 {
-	if (!amdgpu_device_should_use_aspm(adev) || !amdgpu_device_aspm_support_quirk())
+	if (!amdgpu_device_should_use_aspm(adev))
 		return;
 
 	if (adev->nbio.funcs->program_aspm)
@@ -608,9 +608,8 @@ static int nv_update_umd_stable_pstate(struct amdgpu_device *adev,
 	if (adev->gfx.funcs->update_perfmon_mgcg)
 		adev->gfx.funcs->update_perfmon_mgcg(adev, !enter);
 
-	if (!(adev->flags & AMD_IS_APU) &&
-	    (adev->nbio.funcs->enable_aspm) &&
-	     amdgpu_device_should_use_aspm(adev))
+	if (adev->nbio.funcs->enable_aspm &&
+	    amdgpu_device_should_use_aspm(adev))
 		adev->nbio.funcs->enable_aspm(adev, !enter);
 
 	return 0;
diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 1a08052bade3..1a98812981f4 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -1124,7 +1124,7 @@ static void vi_program_aspm(struct amdgpu_device *adev)
 	bool bL1SS = false;
 	bool bClkReqSupport = true;
 
-	if (!amdgpu_device_should_use_aspm(adev) || !amdgpu_device_pcie_dynamic_switching_supported())
+	if (!amdgpu_device_should_use_aspm(adev))
 		return;
 
 	if (adev->asic_type < CHIP_POLARIS10)
-- 
2.34.1