[PATCH] amdgpu: disable amdgpu_dpm on THTF-SW831-1W-DS25_MB board

[WangYuli]

From: wenlunpeng <wenlunpeng at uniontech.com>

The quirk is for reboot-stability.

A device reboot stress test has been observed to cause
random system hangs when amdgpu_dpm is enabled.

Disabling amdgpu_dpm can fix this.

However, a boot-param can still overwrite it to enable
amdgpu_dpm.

Serial log when error occurs:
...
Console: switching to colour frame buffer device 160x45
amdgpu 0000:01:00.0: fb0: amdgpudrmfb frame buffer device
[drm:amdgpu_device_ip_late_init] *ERROR* late_init of IP block <si_dpm> failed -22
amdgpu 0000:01:00.0: amdgpu_device_ip_late_init failed
amdgpu 0000:01:00.0: Fatal error during GPU init
[drm] amdgpu: finishing device.
Console: switching to colour dummy device 80x25
...

Signed-off-by: wenlunpeng <wenlunpeng at uniontech.com>
Signed-off-by: WangYuli <wangyuli at uniontech.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 094498a0964b..81716fcac7cd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -32,6 +32,7 @@
 #include <drm/drm_vblank.h>
 
 #include <linux/cc_platform.h>
+#include <linux/dmi.h>
 #include <linux/dynamic_debug.h>
 #include <linux/module.h>
 #include <linux/mmu_notifier.h>
@@ -3023,10 +3024,32 @@ static struct pci_driver amdgpu_kms_pci_driver = {
 	.dev_groups = amdgpu_sysfs_groups,
 };
 
+static int quirk_set_amdgpu_dpm_0(const struct dmi_system_id *dmi)
+{
+	amdgpu_dpm = 0;
+	pr_info("Identified '%s', set amdgpu_dpm to 0.\n", dmi->ident);
+	return 1;
+}
+
+static const struct dmi_system_id amdgpu_quirklist[] = {
+	{
+		.ident = "DS25 Desktop",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_NAME, "THTF-SW831-1W-DS25_MB"),
+		},
+		.callback = quirk_set_amdgpu_dpm_0,
+	},
+	{}
+};
+
 static int __init amdgpu_init(void)
 {
 	int r;
 
+	/* quirks for some hardware, applied only when it's untouched */
+	if (amdgpu_dpm == -1)
+		dmi_check_system(amdgpu_quirklist);
+
 	if (drm_firmware_drivers_only())
 		return -EINVAL;
 
-- 
2.43.4