[PATCH V2 1/1] 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,

modprobe amdgpu ppfeaturemask=0xfff7bffb

to avoid the module parameter, switch PCI_DPM by determining
intel platform in amd drm driver is a better way.

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...@canonical.com>
---
 .../gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c   | 15 ++++++++++++++-
 1 file changed, 14 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..6ce2a2046457 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu7_hwmgr.c
@@ -27,6 +27,7 @@
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <asm/div64.h>
+#include <asm/intel-family.h>
 #include <drm/amdgpu_drm.h>
 #include "ppatomctrl.h"
 #include "atombios.h"
@@ -1733,6 +1734,17 @@ static int smu7_disable_dpm_tasks(struct pp_hwmgr *hwmgr)
        return result;
 }
 
+static bool intel_core_rkl_chk(void)
+{
+#ifdef CONFIG_X86_64
+       struct cpuinfo_x86 *c = &cpu_data(0);
+
+       return (c->x86 == 6 && c->x86_model == INTEL_FAM6_ROCKETLAKE);
+#else
+       return false;
+#endif
+}
+
 static void smu7_init_dpm_defaults(struct pp_hwmgr *hwmgr)
 {
        struct smu7_hwmgr *data = (struct smu7_hwmgr *)(hwmgr->backend);
@@ -1758,7 +1770,8 @@ 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_core_rkl_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