[Intel-gfx] [PATCH 2/2] drm/amdgpu: Disable PCIE_DPM on Intel RKL Platform

[Koba Ko]

AMD polaris GPUs have an issue about audio noise on RKL platform,
they provide a commit to fix but for SMU7-based GPU still
need another module parameter,

For avoiding the module parameter, switch PCI_DPM by determining
intel platform in amd drm driver.

Fixes: 1a31474cdb48 ("drm/amd/pm: workaround for audio noise issue")
Ref: https://lists.freedesktop.org/archives/amd-gfx/2021-August/067413.html
Signed-off-by: Koba Ko <koba.ko at canonical.com>
---
 .../drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c   | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
index 0541bfc81c1b..346110dd0f51 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
@@ -1733,6 +1733,25 @@ static int smu7_disable_dpm_tasks(struct pp_hwmgr *hwmgr)
 	return result;
 }
 
+#include <drm/intel_pch.h>
+
+static bool intel_tgp_chk(void)
+{
+	struct pci_dev *pch = NULL;
+	unsigned short id;
+
+	while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
+		if (pch->vendor != PCI_VENDOR_ID_INTEL)
+			continue;
+
+		id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
+		if (id == INTEL_PCH_TGP_DEVICE_ID_TYPE || INTEL_PCH_TGP2_DEVICE_ID_TYPE)
+			return true;
+	}
+
+	return false;
+}
+
 static void smu7_init_dpm_defaults(struct pp_hwmgr *hwmgr)
 {
 	struct smu7_hwmgr *data = (struct smu7_hwmgr *)(hwmgr->backend);
@@ -1758,7 +1777,7 @@ static void smu7_init_dpm_defaults(struct pp_hwmgr *hwmgr)
 
 	data->mclk_dpm_key_disabled = hwmgr->feature_mask & PP_MCLK_DPM_MASK ? false : true;
 	data->sclk_dpm_key_disabled = hwmgr->feature_mask & PP_SCLK_DPM_MASK ? false : true;
-	data->pcie_dpm_key_disabled = hwmgr->feature_mask & PP_PCIE_DPM_MASK ? false : true;
+	data->pcie_dpm_key_disabled = intel_tgp_chk() || !(hwmgr->feature_mask & PP_PCIE_DPM_MASK);
 	/* need to set voltage control types before EVV patching */
 	data->voltage_control = SMU7_VOLTAGE_CONTROL_NONE;
 	data->vddci_control = SMU7_VOLTAGE_CONTROL_NONE;
-- 
2.25.1