drm/radeon: add a module parameter to disable aspm

Can cause hangs when enabled in certain motherboards.
Set radeon.aspm=0 to disable aspm.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/evergreen.c

@@ -5515,6 +5515,9 @@ void evergreen_program_aspm(struct radeon_device *rdev)
 	 */
 	bool fusion_platform = false;
 
+	if (radeon_aspm == 0)
+		return;
+
 	if (!(rdev->flags & RADEON_IS_PCIE))
 		return;
 

drivers/gpu/drm/radeon/radeon.h

@@ -97,6 +97,7 @@ extern int radeon_msi;
 extern int radeon_lockup_timeout;
 extern int radeon_fastfb;
 extern int radeon_dpm;
+extern int radeon_aspm;
 
 /*
  * Copy from radeon_drv.h so we don't have to include both and have conflicting

drivers/gpu/drm/radeon/radeon_drv.c

@@ -167,6 +167,7 @@ int radeon_msi = -1;
 int radeon_lockup_timeout = 10000;
 int radeon_fastfb = 0;
 int radeon_dpm = -1;
+int radeon_aspm = -1;
 
 MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers");
 module_param_named(no_wb, radeon_no_wb, int, 0444);
@@ -225,6 +226,9 @@ module_param_named(fastfb, radeon_fastfb, int, 0444);
 MODULE_PARM_DESC(dpm, "DPM support (1 = enable, 0 = disable, -1 = auto)");
 module_param_named(dpm, radeon_dpm, int, 0444);
 
+MODULE_PARM_DESC(aspm, "ASPM support (1 = enable, 0 = disable, -1 = auto)");
+module_param_named(aspm, radeon_aspm, int, 0444);
+
 static struct pci_device_id pciidlist[] = {
 	radeon_PCI_IDS
 };

drivers/gpu/drm/radeon/rv6xx_dpm.c

@@ -1763,12 +1763,14 @@ void rv6xx_setup_asic(struct radeon_device *rdev)
 {
 	r600_enable_acpi_pm(rdev);
 
+	if (radeon_aspm != 0) {
 		if (rdev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_ASPM_L0s)
 			rv6xx_enable_l0s(rdev);
 		if (rdev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_ASPM_L1)
 			rv6xx_enable_l1(rdev);
 		if (rdev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_TURNOFFPLL_ASPML1)
 			rv6xx_enable_pll_sleep_in_l1(rdev);
+	}
 }
 
 void rv6xx_dpm_display_configuration_changed(struct radeon_device *rdev)

drivers/gpu/drm/radeon/rv770_dpm.c

@@ -2099,12 +2099,14 @@ void rv770_dpm_setup_asic(struct radeon_device *rdev)
 
 	rv770_enable_acpi_pm(rdev);
 
+	if (radeon_aspm != 0) {
 		if (rdev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_ASPM_L0s)
 			rv770_enable_l0s(rdev);
 		if (rdev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_ASPM_L1)
 			rv770_enable_l1(rdev);
 		if (rdev->pm.dpm.platform_caps & ATOM_PP_PLATFORM_CAP_TURNOFFPLL_ASPML1)
 			rv770_enable_pll_sleep_in_l1(rdev);
+	}
 }
 
 void rv770_dpm_display_configuration_changed(struct radeon_device *rdev)

drivers/gpu/drm/radeon/si.c

@@ -7053,6 +7053,9 @@ static void si_program_aspm(struct radeon_device *rdev)
 	bool disable_l0s = false, disable_l1 = false, disable_plloff_in_l1 = false;
 	bool disable_clkreq = false;
 
+	if (radeon_aspm == 0)
+		return;
+
 	if (!(rdev->flags & RADEON_IS_PCIE))
 		return;