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authorDave Airlie <airlied@redhat.com>2016-02-05 14:48:36 +1000
committerDave Airlie <airlied@redhat.com>2016-02-05 14:48:36 +1000
commitc745884b30f96348f83ce59caf6798d8085daa77 (patch)
tree9b66b24a73e1bbbbed9db685913e6ce32f7c6fc3
parentec71f1284ae4bb8e2cee27c3931449187a14fe68 (diff)
parent6357b75a5c356a9d8f91c614ab72ac5264a5932c (diff)
downloadlinux-c745884b30f96348f83ce59caf6798d8085daa77.tar.bz2
Merge branch 'drm-fixes-4.5' of git://people.freedesktop.org/~agd5f/linux into drm-fixes
- fix and enable iceland/topaz support - handle WC on platforms that don't support it * 'drm-fixes-4.5' of git://people.freedesktop.org/~agd5f/linux: drm/amdgpu: disable uvd and vce clockgating on Fiji drm/amdgpu: remove exp hardware support from iceland drm/amdgpu: load MEC ucode manually on iceland drm/amdgpu: don't load MEC2 on topaz drm/amdgpu: drop topaz support from gmc8 module drm/amdgpu: pull topaz gmc bits into gmc_v7 drm/amdgpu: The VI specific EXE bit should only apply to GMC v8.0 above drm/amdgpu: iceland use CI based MC IP drm/amdgpu: move gmc7 support out of CIK dependency drm/amdgpu/gfx7: enable cp inst/reg error interrupts drm/amdgpu/gfx8: enable cp inst/reg error interrupts drm/amdgpu: mask out WC from BO on unsupported arches drm/radeon: mask out WC from BO on unsupported arches drm: add helper to check for wc memory support drm/amdgpu: no need to load MC firmware on fiji
-rw-r--r--drivers/gpu/drm/amd/amdgpu/Makefile3
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c10
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_object.c8
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c2
-rw-r--r--drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c20
-rw-r--r--drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c28
-rw-r--r--drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c43
-rw-r--r--drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c30
-rw-r--r--drivers/gpu/drm/amd/amdgpu/iceland_smc.c12
-rw-r--r--drivers/gpu/drm/amd/amdgpu/vi.c10
-rw-r--r--drivers/gpu/drm/radeon/radeon_object.c7
-rw-r--r--include/drm/drm_cache.h9
12 files changed, 123 insertions, 59 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 66f729eaf00b..20c9539abc36 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -25,7 +25,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
amdgpu_ucode.o amdgpu_bo_list.o amdgpu_ctx.o amdgpu_sync.o
# add asic specific block
-amdgpu-$(CONFIG_DRM_AMDGPU_CIK)+= cik.o gmc_v7_0.o cik_ih.o kv_smc.o kv_dpm.o \
+amdgpu-$(CONFIG_DRM_AMDGPU_CIK)+= cik.o cik_ih.o kv_smc.o kv_dpm.o \
ci_smc.o ci_dpm.o dce_v8_0.o gfx_v7_0.o cik_sdma.o uvd_v4_2.o vce_v2_0.o \
amdgpu_amdkfd_gfx_v7.o
@@ -34,6 +34,7 @@ amdgpu-y += \
# add GMC block
amdgpu-y += \
+ gmc_v7_0.o \
gmc_v8_0.o
# add IH block
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index b5dbbb573491..9c1af8976bef 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -256,11 +256,11 @@ static struct pci_device_id pciidlist[] = {
{0x1002, 0x985F, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_MULLINS|AMD_IS_MOBILITY|AMD_IS_APU},
#endif
/* topaz */
- {0x1002, 0x6900, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ|AMD_EXP_HW_SUPPORT},
- {0x1002, 0x6901, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ|AMD_EXP_HW_SUPPORT},
- {0x1002, 0x6902, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ|AMD_EXP_HW_SUPPORT},
- {0x1002, 0x6903, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ|AMD_EXP_HW_SUPPORT},
- {0x1002, 0x6907, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ|AMD_EXP_HW_SUPPORT},
+ {0x1002, 0x6900, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ},
+ {0x1002, 0x6901, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ},
+ {0x1002, 0x6902, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ},
+ {0x1002, 0x6903, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ},
+ {0x1002, 0x6907, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TOPAZ},
/* tonga */
{0x1002, 0x6920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TONGA},
{0x1002, 0x6921, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TONGA},
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index a2a16acee34d..b8fbbd7699e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -33,6 +33,7 @@
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/amdgpu_drm.h>
+#include <drm/drm_cache.h>
#include "amdgpu.h"
#include "amdgpu_trace.h"
@@ -261,6 +262,13 @@ int amdgpu_bo_create_restricted(struct amdgpu_device *adev,
AMDGPU_GEM_DOMAIN_OA);
bo->flags = flags;
+
+ /* For architectures that don't support WC memory,
+ * mask out the WC flag from the BO
+ */
+ if (!drm_arch_can_wc_memory())
+ bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC;
+
amdgpu_fill_placement_to_bo(bo, placement);
/* Kernel allocation are uninterruptible */
r = ttm_bo_init(&adev->mman.bdev, &bo->tbo, size, type,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 8a1752ff3d8e..55cf05e1c81c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -808,7 +808,7 @@ uint32_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
flags |= AMDGPU_PTE_SNOOPED;
}
- if (adev->asic_type >= CHIP_TOPAZ)
+ if (adev->asic_type >= CHIP_TONGA)
flags |= AMDGPU_PTE_EXECUTABLE;
flags |= AMDGPU_PTE_READABLE;
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
index 72793f93e2fc..6c76139de1c9 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v7_0.c
@@ -4738,6 +4738,22 @@ static int gfx_v7_0_early_init(void *handle)
return 0;
}
+static int gfx_v7_0_late_init(void *handle)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+ int r;
+
+ r = amdgpu_irq_get(adev, &adev->gfx.priv_reg_irq, 0);
+ if (r)
+ return r;
+
+ r = amdgpu_irq_get(adev, &adev->gfx.priv_inst_irq, 0);
+ if (r)
+ return r;
+
+ return 0;
+}
+
static int gfx_v7_0_sw_init(void *handle)
{
struct amdgpu_ring *ring;
@@ -4890,6 +4906,8 @@ static int gfx_v7_0_hw_fini(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+ amdgpu_irq_put(adev, &adev->gfx.priv_reg_irq, 0);
+ amdgpu_irq_put(adev, &adev->gfx.priv_inst_irq, 0);
gfx_v7_0_cp_enable(adev, false);
gfx_v7_0_rlc_stop(adev);
gfx_v7_0_fini_pg(adev);
@@ -5527,7 +5545,7 @@ static int gfx_v7_0_set_powergating_state(void *handle,
const struct amd_ip_funcs gfx_v7_0_ip_funcs = {
.early_init = gfx_v7_0_early_init,
- .late_init = NULL,
+ .late_init = gfx_v7_0_late_init,
.sw_init = gfx_v7_0_sw_init,
.sw_fini = gfx_v7_0_sw_fini,
.hw_init = gfx_v7_0_hw_init,
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index 95c0cdfbd1b3..8f8ec37ecd88 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -111,7 +111,6 @@ MODULE_FIRMWARE("amdgpu/topaz_ce.bin");
MODULE_FIRMWARE("amdgpu/topaz_pfp.bin");
MODULE_FIRMWARE("amdgpu/topaz_me.bin");
MODULE_FIRMWARE("amdgpu/topaz_mec.bin");
-MODULE_FIRMWARE("amdgpu/topaz_mec2.bin");
MODULE_FIRMWARE("amdgpu/topaz_rlc.bin");
MODULE_FIRMWARE("amdgpu/fiji_ce.bin");
@@ -828,7 +827,8 @@ static int gfx_v8_0_init_microcode(struct amdgpu_device *adev)
adev->gfx.mec_fw_version = le32_to_cpu(cp_hdr->header.ucode_version);
adev->gfx.mec_feature_version = le32_to_cpu(cp_hdr->ucode_feature_version);
- if (adev->asic_type != CHIP_STONEY) {
+ if ((adev->asic_type != CHIP_STONEY) &&
+ (adev->asic_type != CHIP_TOPAZ)) {
snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_mec2.bin", chip_name);
err = request_firmware(&adev->gfx.mec2_fw, fw_name, adev->dev);
if (!err) {
@@ -3851,10 +3851,16 @@ static int gfx_v8_0_cp_resume(struct amdgpu_device *adev)
if (r)
return -EINVAL;
- r = adev->smu.smumgr_funcs->check_fw_load_finish(adev,
- AMDGPU_UCODE_ID_CP_MEC1);
- if (r)
- return -EINVAL;
+ if (adev->asic_type == CHIP_TOPAZ) {
+ r = gfx_v8_0_cp_compute_load_microcode(adev);
+ if (r)
+ return r;
+ } else {
+ r = adev->smu.smumgr_funcs->check_fw_load_finish(adev,
+ AMDGPU_UCODE_ID_CP_MEC1);
+ if (r)
+ return -EINVAL;
+ }
}
}
@@ -3901,6 +3907,8 @@ static int gfx_v8_0_hw_fini(void *handle)
{
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+ amdgpu_irq_put(adev, &adev->gfx.priv_reg_irq, 0);
+ amdgpu_irq_put(adev, &adev->gfx.priv_inst_irq, 0);
gfx_v8_0_cp_enable(adev, false);
gfx_v8_0_rlc_stop(adev);
gfx_v8_0_cp_compute_fini(adev);
@@ -4329,6 +4337,14 @@ static int gfx_v8_0_late_init(void *handle)
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
int r;
+ r = amdgpu_irq_get(adev, &adev->gfx.priv_reg_irq, 0);
+ if (r)
+ return r;
+
+ r = amdgpu_irq_get(adev, &adev->gfx.priv_inst_irq, 0);
+ if (r)
+ return r;
+
/* requires IBs so do in late init after IB pool is initialized */
r = gfx_v8_0_do_edc_gpr_workarounds(adev);
if (r)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
index 3f956065d069..8aa2991ab379 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
@@ -42,9 +42,39 @@ static void gmc_v7_0_set_irq_funcs(struct amdgpu_device *adev);
MODULE_FIRMWARE("radeon/bonaire_mc.bin");
MODULE_FIRMWARE("radeon/hawaii_mc.bin");
+MODULE_FIRMWARE("amdgpu/topaz_mc.bin");
+
+static const u32 golden_settings_iceland_a11[] =
+{
+ mmVM_PRT_APERTURE0_LOW_ADDR, 0x0fffffff, 0x0fffffff,
+ mmVM_PRT_APERTURE1_LOW_ADDR, 0x0fffffff, 0x0fffffff,
+ mmVM_PRT_APERTURE2_LOW_ADDR, 0x0fffffff, 0x0fffffff,
+ mmVM_PRT_APERTURE3_LOW_ADDR, 0x0fffffff, 0x0fffffff
+};
+
+static const u32 iceland_mgcg_cgcg_init[] =
+{
+ mmMC_MEM_POWER_LS, 0xffffffff, 0x00000104
+};
+
+static void gmc_v7_0_init_golden_registers(struct amdgpu_device *adev)
+{
+ switch (adev->asic_type) {
+ case CHIP_TOPAZ:
+ amdgpu_program_register_sequence(adev,
+ iceland_mgcg_cgcg_init,
+ (const u32)ARRAY_SIZE(iceland_mgcg_cgcg_init));
+ amdgpu_program_register_sequence(adev,
+ golden_settings_iceland_a11,
+ (const u32)ARRAY_SIZE(golden_settings_iceland_a11));
+ break;
+ default:
+ break;
+ }
+}
/**
- * gmc8_mc_wait_for_idle - wait for MC idle callback.
+ * gmc7_mc_wait_for_idle - wait for MC idle callback.
*
* @adev: amdgpu_device pointer
*
@@ -132,13 +162,20 @@ static int gmc_v7_0_init_microcode(struct amdgpu_device *adev)
case CHIP_HAWAII:
chip_name = "hawaii";
break;
+ case CHIP_TOPAZ:
+ chip_name = "topaz";
+ break;
case CHIP_KAVERI:
case CHIP_KABINI:
return 0;
default: BUG();
}
- snprintf(fw_name, sizeof(fw_name), "radeon/%s_mc.bin", chip_name);
+ if (adev->asic_type == CHIP_TOPAZ)
+ snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_mc.bin", chip_name);
+ else
+ snprintf(fw_name, sizeof(fw_name), "radeon/%s_mc.bin", chip_name);
+
err = request_firmware(&adev->mc.fw, fw_name, adev->dev);
if (err)
goto out;
@@ -984,6 +1021,8 @@ static int gmc_v7_0_hw_init(void *handle)
int r;
struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+ gmc_v7_0_init_golden_registers(adev);
+
gmc_v7_0_mc_program(adev);
if (!(adev->flags & AMD_IS_APU)) {
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index c0c9a0101eb4..3efd45546241 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -42,9 +42,7 @@
static void gmc_v8_0_set_gart_funcs(struct amdgpu_device *adev);
static void gmc_v8_0_set_irq_funcs(struct amdgpu_device *adev);
-MODULE_FIRMWARE("amdgpu/topaz_mc.bin");
MODULE_FIRMWARE("amdgpu/tonga_mc.bin");
-MODULE_FIRMWARE("amdgpu/fiji_mc.bin");
static const u32 golden_settings_tonga_a11[] =
{
@@ -75,19 +73,6 @@ static const u32 fiji_mgcg_cgcg_init[] =
mmMC_MEM_POWER_LS, 0xffffffff, 0x00000104
};
-static const u32 golden_settings_iceland_a11[] =
-{
- mmVM_PRT_APERTURE0_LOW_ADDR, 0x0fffffff, 0x0fffffff,
- mmVM_PRT_APERTURE1_LOW_ADDR, 0x0fffffff, 0x0fffffff,
- mmVM_PRT_APERTURE2_LOW_ADDR, 0x0fffffff, 0x0fffffff,
- mmVM_PRT_APERTURE3_LOW_ADDR, 0x0fffffff, 0x0fffffff
-};
-
-static const u32 iceland_mgcg_cgcg_init[] =
-{
- mmMC_MEM_POWER_LS, 0xffffffff, 0x00000104
-};
-
static const u32 cz_mgcg_cgcg_init[] =
{
mmMC_MEM_POWER_LS, 0xffffffff, 0x00000104
@@ -102,14 +87,6 @@ static const u32 stoney_mgcg_cgcg_init[] =
static void gmc_v8_0_init_golden_registers(struct amdgpu_device *adev)
{
switch (adev->asic_type) {
- case CHIP_TOPAZ:
- amdgpu_program_register_sequence(adev,
- iceland_mgcg_cgcg_init,
- (const u32)ARRAY_SIZE(iceland_mgcg_cgcg_init));
- amdgpu_program_register_sequence(adev,
- golden_settings_iceland_a11,
- (const u32)ARRAY_SIZE(golden_settings_iceland_a11));
- break;
case CHIP_FIJI:
amdgpu_program_register_sequence(adev,
fiji_mgcg_cgcg_init,
@@ -229,15 +206,10 @@ static int gmc_v8_0_init_microcode(struct amdgpu_device *adev)
DRM_DEBUG("\n");
switch (adev->asic_type) {
- case CHIP_TOPAZ:
- chip_name = "topaz";
- break;
case CHIP_TONGA:
chip_name = "tonga";
break;
case CHIP_FIJI:
- chip_name = "fiji";
- break;
case CHIP_CARRIZO:
case CHIP_STONEY:
return 0;
@@ -1007,7 +979,7 @@ static int gmc_v8_0_hw_init(void *handle)
gmc_v8_0_mc_program(adev);
- if (!(adev->flags & AMD_IS_APU)) {
+ if (adev->asic_type == CHIP_TONGA) {
r = gmc_v8_0_mc_load_microcode(adev);
if (r) {
DRM_ERROR("Failed to load MC firmware!\n");
diff --git a/drivers/gpu/drm/amd/amdgpu/iceland_smc.c b/drivers/gpu/drm/amd/amdgpu/iceland_smc.c
index 966d4b2ed9da..090486c18249 100644
--- a/drivers/gpu/drm/amd/amdgpu/iceland_smc.c
+++ b/drivers/gpu/drm/amd/amdgpu/iceland_smc.c
@@ -432,7 +432,7 @@ static uint32_t iceland_smu_get_mask_for_fw_type(uint32_t fw_type)
case AMDGPU_UCODE_ID_CP_ME:
return UCODE_ID_CP_ME_MASK;
case AMDGPU_UCODE_ID_CP_MEC1:
- return UCODE_ID_CP_MEC_MASK | UCODE_ID_CP_MEC_JT1_MASK | UCODE_ID_CP_MEC_JT2_MASK;
+ return UCODE_ID_CP_MEC_MASK | UCODE_ID_CP_MEC_JT1_MASK;
case AMDGPU_UCODE_ID_CP_MEC2:
return UCODE_ID_CP_MEC_MASK;
case AMDGPU_UCODE_ID_RLC_G:
@@ -522,12 +522,6 @@ static int iceland_smu_request_load_fw(struct amdgpu_device *adev)
return -EINVAL;
}
- if (iceland_smu_populate_single_firmware_entry(adev, UCODE_ID_CP_MEC_JT2,
- &toc->entry[toc->num_entries++])) {
- DRM_ERROR("Failed to get firmware entry for MEC_JT2\n");
- return -EINVAL;
- }
-
if (iceland_smu_populate_single_firmware_entry(adev, UCODE_ID_SDMA0,
&toc->entry[toc->num_entries++])) {
DRM_ERROR("Failed to get firmware entry for SDMA0\n");
@@ -550,8 +544,8 @@ static int iceland_smu_request_load_fw(struct amdgpu_device *adev)
UCODE_ID_CP_ME_MASK |
UCODE_ID_CP_PFP_MASK |
UCODE_ID_CP_MEC_MASK |
- UCODE_ID_CP_MEC_JT1_MASK |
- UCODE_ID_CP_MEC_JT2_MASK;
+ UCODE_ID_CP_MEC_JT1_MASK;
+
if (iceland_send_msg_to_smc_with_parameter_without_waiting(adev, PPSMC_MSG_LoadUcodes, fw_to_load)) {
DRM_ERROR("Fail to request SMU load ucode\n");
diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 652e76644c31..89f5a1ff6f43 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -61,6 +61,7 @@
#include "vi.h"
#include "vi_dpm.h"
#include "gmc_v8_0.h"
+#include "gmc_v7_0.h"
#include "gfx_v8_0.h"
#include "sdma_v2_4.h"
#include "sdma_v3_0.h"
@@ -1109,10 +1110,10 @@ static const struct amdgpu_ip_block_version topaz_ip_blocks[] =
},
{
.type = AMD_IP_BLOCK_TYPE_GMC,
- .major = 8,
- .minor = 0,
+ .major = 7,
+ .minor = 4,
.rev = 0,
- .funcs = &gmc_v8_0_ip_funcs,
+ .funcs = &gmc_v7_0_ip_funcs,
},
{
.type = AMD_IP_BLOCK_TYPE_IH,
@@ -1442,8 +1443,7 @@ static int vi_common_early_init(void *handle)
break;
case CHIP_FIJI:
adev->has_uvd = true;
- adev->cg_flags = AMDGPU_CG_SUPPORT_UVD_MGCG |
- AMDGPU_CG_SUPPORT_VCE_MGCG;
+ adev->cg_flags = 0;
adev->pg_flags = 0;
adev->external_rev_id = adev->rev_id + 0x3c;
break;
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 84d45633d28c..fb6ad143873f 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -33,6 +33,7 @@
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/radeon_drm.h>
+#include <drm/drm_cache.h>
#include "radeon.h"
#include "radeon_trace.h"
@@ -245,6 +246,12 @@ int radeon_bo_create(struct radeon_device *rdev,
DRM_INFO_ONCE("Please enable CONFIG_MTRR and CONFIG_X86_PAT for "
"better performance thanks to write-combining\n");
bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC);
+#else
+ /* For architectures that don't support WC memory,
+ * mask out the WC flag from the BO
+ */
+ if (!drm_arch_can_wc_memory())
+ bo->flags &= ~RADEON_GEM_GTT_WC;
#endif
radeon_ttm_placement_from_domain(bo, domain);
diff --git a/include/drm/drm_cache.h b/include/drm/drm_cache.h
index 7bfb063029d8..461a0558bca4 100644
--- a/include/drm/drm_cache.h
+++ b/include/drm/drm_cache.h
@@ -35,4 +35,13 @@
void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
+static inline bool drm_arch_can_wc_memory(void)
+{
+#if defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
+ return false;
+#else
+ return true;
+#endif
+}
+
#endif