Merge branch 'drm-next-3.9' of git://people.freedesktop.org/~agd5f/linux into drm-next

More drm-next bits for radeon.  Just bug fixes.

* 'drm-next-3.9' of git://people.freedesktop.org/~agd5f/linux:
  drm/radeon: properly validate the atpx interface
  drm/radeon: switch get_gpu_clock() to a callback (v2)
  drm/radeon: add a asic callback to get the xclk
  drm/radeon: Avoid NULL pointer dereference from atom_index_iio() allocation failure
  drm/radeon: remove overzealous warning in hdmi handling
  drm/radeon: fix multi-head power profile stability on BTC+ asics

15 files changed, 212 insertions, 19 deletions

diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
index 5ce9bf51a8de..46a9c3772850 100644
--- a/drivers/gpu/drm/radeon/atom.c
+++ b/drivers/gpu/drm/radeon/atom.c
@@ -1238,6 +1238,8 @@ static int atom_iio_len[] = { 1, 2, 3, 3, 3, 3, 4, 4, 4, 3 };
 static void atom_index_iio(struct atom_context *ctx, int base)
 {
         ctx->iio = kzalloc(2 * 256, GFP_KERNEL);
+        if (!ctx->iio)
+                return;
         while (CU8(base) == ATOM_IIO_START) {
                 ctx->iio[CU8(base + 1)] = base + 2;
                 base += 2;
@@ -1287,6 +1289,10 @@ struct atom_context *atom_parse(struct card_info *card, void *bios)
         ctx->cmd_table = CU16(base + ATOM_ROM_CMD_PTR);
         ctx->data_table = CU16(base + ATOM_ROM_DATA_PTR);
         atom_index_iio(ctx, CU16(ctx->data_table + ATOM_DATA_IIO_PTR) + 4);
+        if (!ctx->iio) {
+                atom_destroy(ctx);
+                return NULL;
+        }
 
         str = CSTR(CU16(base + ATOM_ROM_MSG_PTR));
         while (*str && ((*str == '\n') || (*str == '\r')))
@@ -1335,8 +1341,7 @@ int atom_asic_init(struct atom_context *ctx)
 
 void atom_destroy(struct atom_context *ctx)
 {
-        if (ctx->iio)
-                kfree(ctx->iio);
+        kfree(ctx->iio);
         kfree(ctx);
 }
 
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 2916de896a60..3c38ea46531c 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -403,6 +403,19 @@ void evergreen_pm_misc(struct radeon_device *rdev)
                         rdev->pm.current_vddc = voltage->voltage;
                         DRM_DEBUG("Setting: vddc: %d\n", voltage->voltage);
                 }
+
+                /* starting with BTC, there is one state that is used for both
+                 * MH and SH.  Difference is that we always use the high clock index for
+                 * mclk and vddci.
+                 */
+                if ((rdev->pm.pm_method == PM_METHOD_PROFILE) &&
+                    (rdev->family >= CHIP_BARTS) &&
+                    rdev->pm.active_crtc_count &&
+                    ((rdev->pm.profile_index == PM_PROFILE_MID_MH_IDX) ||
+                     (rdev->pm.profile_index == PM_PROFILE_LOW_MH_IDX)))
+                        voltage = &rdev->pm.power_state[req_ps_idx].
+                                clock_info[rdev->pm.profiles[PM_PROFILE_HIGH_MH_IDX].dpms_on_cm_idx].voltage;
+
                 /* 0xff01 is a flag rather then an actual voltage */
                 if (voltage->vddci == 0xff01)
                         return;
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index dbcb0752f083..6d4b5611daf4 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -109,6 +109,19 @@ void r600_fini(struct radeon_device *rdev);
 void r600_irq_disable(struct radeon_device *rdev);
 static void r600_pcie_gen2_enable(struct radeon_device *rdev);
 
+/**
+ * r600_get_xclk - get the xclk
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Returns the reference clock used by the gfx engine
+ * (r6xx, IGPs, APUs).
+ */
+u32 r600_get_xclk(struct radeon_device *rdev)
+{
+        return rdev->clock.spll.reference_freq;
+}
+
 /* get temperature in millidegrees */
 int rv6xx_get_temp(struct radeon_device *rdev)
 {
@@ -4448,14 +4461,14 @@ static void r600_pcie_gen2_enable(struct radeon_device *rdev)
 }
 
 /**
- * r600_get_gpu_clock - return GPU clock counter snapshot
+ * r600_get_gpu_clock_counter - return GPU clock counter snapshot
  *
  * @rdev: radeon_device pointer
  *
  * Fetches a GPU clock counter snapshot (R6xx-cayman).
  * Returns the 64 bit clock counter snapshot.
  */
-uint64_t r600_get_gpu_clock(struct radeon_device *rdev)
+uint64_t r600_get_gpu_clock_counter(struct radeon_device *rdev)
 {
         uint64_t clock;
 
diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c
index ff80efe9cb7d..95970ec47c45 100644
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -544,7 +544,6 @@ void r600_hdmi_disable(struct drm_encoder *encoder)
 
         /* Called for ATOM_ENCODER_MODE_HDMI only */
         if (!dig || !dig->afmt) {
-                WARN_ON(1);
                 return;
         }
         if (!dig->afmt->enabled)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index bb43a849759b..8263af3fd832 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1178,6 +1178,10 @@ struct radeon_asic {
         bool (*gui_idle)(struct radeon_device *rdev);
         /* wait for mc_idle */
         int (*mc_wait_for_idle)(struct radeon_device *rdev);
+        /* get the reference clock */
+        u32 (*get_xclk)(struct radeon_device *rdev);
+        /* get the gpu clock counter */
+        uint64_t (*get_gpu_clock_counter)(struct radeon_device *rdev);
         /* gart */
         struct {
                 void (*tlb_flush)(struct radeon_device *rdev);
@@ -1859,6 +1863,8 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
 #define radeon_post_page_flip(rdev, crtc) (rdev)->asic->pflip.post_page_flip((rdev), (crtc))
 #define radeon_wait_for_vblank(rdev, crtc) (rdev)->asic->display.wait_for_vblank((rdev), (crtc))
 #define radeon_mc_wait_for_idle(rdev) (rdev)->asic->mc_wait_for_idle((rdev))
+#define radeon_get_xclk(rdev) (rdev)->asic->get_xclk((rdev))
+#define radeon_get_gpu_clock_counter(rdev) (rdev)->asic->get_gpu_clock_counter((rdev))
 
 /* Common functions */
 /* AGP */
diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c
index 67f008febec7..aba0a893ea98 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.c
+++ b/drivers/gpu/drm/radeon/radeon_asic.c
@@ -934,6 +934,8 @@ static struct radeon_asic r600_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &r600_mc_wait_for_idle,
+        .get_xclk = &r600_get_xclk,
+        .get_gpu_clock_counter = &r600_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &r600_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
@@ -1018,6 +1020,8 @@ static struct radeon_asic rs780_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &r600_mc_wait_for_idle,
+        .get_xclk = &r600_get_xclk,
+        .get_gpu_clock_counter = &r600_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &r600_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
@@ -1102,6 +1106,8 @@ static struct radeon_asic rv770_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &r600_mc_wait_for_idle,
+        .get_xclk = &rv770_get_xclk,
+        .get_gpu_clock_counter = &r600_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &r600_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
@@ -1186,6 +1192,8 @@ static struct radeon_asic evergreen_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &evergreen_mc_wait_for_idle,
+        .get_xclk = &rv770_get_xclk,
+        .get_gpu_clock_counter = &r600_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &evergreen_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
@@ -1270,6 +1278,8 @@ static struct radeon_asic sumo_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &evergreen_mc_wait_for_idle,
+        .get_xclk = &r600_get_xclk,
+        .get_gpu_clock_counter = &r600_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &evergreen_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
@@ -1354,6 +1364,8 @@ static struct radeon_asic btc_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &evergreen_mc_wait_for_idle,
+        .get_xclk = &rv770_get_xclk,
+        .get_gpu_clock_counter = &r600_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &evergreen_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
@@ -1438,6 +1450,8 @@ static struct radeon_asic cayman_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &evergreen_mc_wait_for_idle,
+        .get_xclk = &rv770_get_xclk,
+        .get_gpu_clock_counter = &r600_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &cayman_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
@@ -1565,6 +1579,8 @@ static struct radeon_asic trinity_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &evergreen_mc_wait_for_idle,
+        .get_xclk = &r600_get_xclk,
+        .get_gpu_clock_counter = &r600_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &cayman_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
@@ -1692,6 +1708,8 @@ static struct radeon_asic si_asic = {
         .ioctl_wait_idle = r600_ioctl_wait_idle,
         .gui_idle = &r600_gui_idle,
         .mc_wait_for_idle = &evergreen_mc_wait_for_idle,
+        .get_xclk = &si_get_xclk,
+        .get_gpu_clock_counter = &si_get_gpu_clock_counter,
         .gart = {
                 .tlb_flush = &si_pcie_gart_tlb_flush,
                 .set_page = &rs600_gart_set_page,
diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index f4134a823958..3535f73ad3e2 100644
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -389,7 +389,8 @@ void r600_kms_blit_copy(struct radeon_device *rdev,
                         unsigned num_gpu_pages,
                         struct radeon_sa_bo *vb);
 int r600_mc_wait_for_idle(struct radeon_device *rdev);
-uint64_t r600_get_gpu_clock(struct radeon_device *rdev);
+u32 r600_get_xclk(struct radeon_device *rdev);
+uint64_t r600_get_gpu_clock_counter(struct radeon_device *rdev);
 
 /*
  * rv770,rv730,rv710,rv740
@@ -407,6 +408,7 @@ int rv770_copy_dma(struct radeon_device *rdev,
                   uint64_t src_offset, uint64_t dst_offset,
                   unsigned num_gpu_pages,
                    struct radeon_fence **fence);
+u32 rv770_get_xclk(struct radeon_device *rdev);
 
 /*
  * evergreen
@@ -515,11 +517,12 @@ void si_vm_set_page(struct radeon_device *rdev,
                     uint32_t incr, uint32_t flags);
 void si_vm_flush(struct radeon_device *rdev, int ridx, struct radeon_vm *vm);
 int si_ib_parse(struct radeon_device *rdev, struct radeon_ib *ib);
-uint64_t si_get_gpu_clock(struct radeon_device *rdev);
 int si_copy_dma(struct radeon_device *rdev,
                 uint64_t src_offset, uint64_t dst_offset,
                 unsigned num_gpu_pages,
                 struct radeon_fence **fence);
 void si_dma_vm_flush(struct radeon_device *rdev, int ridx, struct radeon_vm *vm);
+u32 si_get_xclk(struct radeon_device *rdev);
+uint64_t si_get_gpu_clock_counter(struct radeon_device *rdev);
 
 #endif
diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index 15f5ded65e0c..d96070bf8388 100644
--- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c
+++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
@@ -43,6 +43,12 @@ struct atpx_verify_interface {
         u32 function_bits;      /* supported functions bit vector */
 } __packed;
 
+struct atpx_px_params {
+        u16 size;               /* structure size in bytes (includes size field) */
+        u32 valid_flags;        /* which flags are valid */
+        u32 flags;              /* flags */
+} __packed;
+
 struct atpx_power_control {
         u16 size;
         u8 dgpu_state;
@@ -123,9 +129,61 @@ static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mas
 }
 
 /**
+ * radeon_atpx_validate_functions - validate ATPX functions
+ *
+ * @atpx: radeon atpx struct
+ *
+ * Validate that required functions are enabled (all asics).
+ * returns 0 on success, error on failure.
+ */
+static int radeon_atpx_validate(struct radeon_atpx *atpx)
+{
+        /* make sure required functions are enabled */
+        /* dGPU power control is required */
+        atpx->functions.power_cntl = true;
+
+        if (atpx->functions.px_params) {
+                union acpi_object *info;
+                struct atpx_px_params output;
+                size_t size;
+                u32 valid_bits;
+
+                info = radeon_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);
+                if (!info)
+                        return -EIO;
+
+                memset(&output, 0, sizeof(output));
+
+                size = *(u16 *) info->buffer.pointer;
+                if (size < 10) {
+                        printk("ATPX buffer is too small: %zu\n", size);
+                        kfree(info);
+                        return -EINVAL;
+                }
+                size = min(sizeof(output), size);
+
+                memcpy(&output, info->buffer.pointer, size);
+
+                valid_bits = output.flags & output.valid_flags;
+                /* if separate mux flag is set, mux controls are required */
+                if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {
+                        atpx->functions.i2c_mux_cntl = true;
+                        atpx->functions.disp_mux_cntl = true;
+                }
+                /* if any outputs are muxed, mux controls are required */
+                if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |
+                                  ATPX_TV_SIGNAL_MUXED |
+                                  ATPX_DFP_SIGNAL_MUXED))
+                        atpx->functions.disp_mux_cntl = true;
+
+                kfree(info);
+        }
+        return 0;
+}
+
+/**
  * radeon_atpx_verify_interface - verify ATPX
  *
- * @handle: acpi handle
  * @atpx: radeon atpx struct
  *
  * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function
@@ -406,8 +464,19 @@ static bool radeon_atpx_pci_probe_handle(struct pci_dev *pdev)
  */
 static int radeon_atpx_init(void)
 {
+        int r;
+
         /* set up the ATPX handle */
-        return radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
+        r = radeon_atpx_verify_interface(&radeon_atpx_priv.atpx);
+        if (r)
+                return r;
+
+        /* validate the atpx setup */
+        r = radeon_atpx_validate(&radeon_atpx_priv.atpx);
+        if (r)
+                return r;
+
+        return 0;
 }
 
 /**
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 8794de10a6c7..44b8034a400d 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -759,6 +759,11 @@ int radeon_atombios_init(struct radeon_device *rdev)
         atom_card_info->pll_write = cail_pll_write;
 
         rdev->mode_info.atom_context = atom_parse(atom_card_info, rdev->bios);
+        if (!rdev->mode_info.atom_context) {
+                radeon_atombios_fini(rdev);
+                return -ENOMEM;
+        }
+
         mutex_init(&rdev->mode_info.atom_context->mutex);
         radeon_atom_initialize_bios_scratch_regs(rdev->ddev);
         atom_allocate_fb_scratch(rdev->mode_info.atom_context);
@@ -778,9 +783,11 @@ void radeon_atombios_fini(struct radeon_device *rdev)
 {
         if (rdev->mode_info.atom_context) {
                 kfree(rdev->mode_info.atom_context->scratch);
-                kfree(rdev->mode_info.atom_context);
         }
+        kfree(rdev->mode_info.atom_context);
+        rdev->mode_info.atom_context = NULL;
         kfree(rdev->mode_info.atom_card_info);
+        rdev->mode_info.atom_card_info = NULL;
 }
 
 /* COMBIOS */
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 9c312f9afb68..c75cb2c6ba71 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -185,11 +185,7 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
         if (info->request == RADEON_INFO_TIMESTAMP) {
                 if (rdev->family >= CHIP_R600) {
                         value_ptr64 = (uint64_t*)((unsigned long)info->value);
-                        if (rdev->family >= CHIP_TAHITI) {
-                                value64 = si_get_gpu_clock(rdev);
-                        } else {
-                                value64 = r600_get_gpu_clock(rdev);
-                        }
+                        value64 = radeon_get_gpu_clock_counter(rdev);
 
                         if (DRM_COPY_TO_USER(value_ptr64, &value64, sizeof(value64))) {
                                 DRM_ERROR("copy_to_user %s:%u\n", __func__, __LINE__);
@@ -282,7 +278,10 @@ int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
                 break;
         case RADEON_INFO_CLOCK_CRYSTAL_FREQ:
                 /* return clock value in KHz */
-                value = rdev->clock.spll.reference_freq * 10;
+                if (rdev->asic->get_xclk)
+                        value = radeon_get_xclk(rdev) * 10;
+                else
+                        value = rdev->clock.spll.reference_freq * 10;
                 break;
         case RADEON_INFO_NUM_BACKENDS:
                 if (rdev->family >= CHIP_TAHITI)
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 0bfa656aa87d..338fd6a74e87 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -169,7 +169,7 @@ static void radeon_set_power_state(struct radeon_device *rdev)
 
                 /* starting with BTC, there is one state that is used for both
                  * MH and SH.  Difference is that we always use the high clock index for
-                 * mclk.
+                 * mclk and vddci.
                  */
                 if ((rdev->pm.pm_method == PM_METHOD_PROFILE) &&
                     (rdev->family >= CHIP_BARTS) &&
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index 1b2444f4d8f4..d63fe1d0f53f 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -43,6 +43,31 @@ static void rv770_gpu_init(struct radeon_device *rdev);
 void rv770_fini(struct radeon_device *rdev);
 static void rv770_pcie_gen2_enable(struct radeon_device *rdev);
 
+#define PCIE_BUS_CLK                10000
+#define TCLK                        (PCIE_BUS_CLK / 10)
+
+/**
+ * rv770_get_xclk - get the xclk
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Returns the reference clock used by the gfx engine
+ * (r7xx-cayman).
+ */
+u32 rv770_get_xclk(struct radeon_device *rdev)
+{
+        u32 reference_clock = rdev->clock.spll.reference_freq;
+        u32 tmp = RREG32(CG_CLKPIN_CNTL);
+
+        if (tmp & MUX_TCLK_TO_XCLK)
+                return TCLK;
+
+        if (tmp & XTALIN_DIVIDE)
+                return reference_clock / 4;
+
+        return reference_clock;
+}
+
 u32 rv770_page_flip(struct radeon_device *rdev, int crtc_id, u64 crtc_base)
 {
         struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc_id];
diff --git a/drivers/gpu/drm/radeon/rv770d.h b/drivers/gpu/drm/radeon/rv770d.h
index 20e29d23d348..c55f950a4af7 100644
--- a/drivers/gpu/drm/radeon/rv770d.h
+++ b/drivers/gpu/drm/radeon/rv770d.h
@@ -128,6 +128,10 @@
 #define         GUI_ACTIVE                                      (1<<31)
 #define GRBM_STATUS2                                    0x8014
 
+#define CG_CLKPIN_CNTL                                    0x660
+#       define MUX_TCLK_TO_XCLK                           (1 << 8)
+#       define XTALIN_DIVIDE                              (1 << 9)
+
 #define CG_MULT_THERMAL_STATUS                          0x740
 #define         ASIC_T(x)                               ((x) << 16)
 #define         ASIC_T_MASK                             0x3FF0000
diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index 719f03e061db..80979ed951eb 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -70,6 +70,33 @@ extern u32 evergreen_get_number_of_dram_channels(struct radeon_device *rdev);
 extern void evergreen_print_gpu_status_regs(struct radeon_device *rdev);
 extern bool evergreen_is_display_hung(struct radeon_device *rdev);
 
+#define PCIE_BUS_CLK                10000
+#define TCLK                        (PCIE_BUS_CLK / 10)
+
+/**
+ * si_get_xclk - get the xclk
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Returns the reference clock used by the gfx engine
+ * (SI).
+ */
+u32 si_get_xclk(struct radeon_device *rdev)
+{
+        u32 reference_clock = rdev->clock.spll.reference_freq;
+        u32 tmp;
+
+        tmp = RREG32(CG_CLKPIN_CNTL_2);
+        if (tmp & MUX_TCLK_TO_XCLK)
+                return TCLK;
+
+        tmp = RREG32(CG_CLKPIN_CNTL);
+        if (tmp & XTALIN_DIVIDE)
+                return reference_clock / 4;
+
+        return reference_clock;
+}
+
 /* get temperature in millidegrees */
 int si_get_temp(struct radeon_device *rdev)
 {
@@ -4582,14 +4609,14 @@ void si_fini(struct radeon_device *rdev)
 }
 
 /**
- * si_get_gpu_clock - return GPU clock counter snapshot
+ * si_get_gpu_clock_counter - return GPU clock counter snapshot
  *
  * @rdev: radeon_device pointer
  *
  * Fetches a GPU clock counter snapshot (SI).
  * Returns the 64 bit clock counter snapshot.
  */
-uint64_t si_get_gpu_clock(struct radeon_device *rdev)
+uint64_t si_get_gpu_clock_counter(struct radeon_device *rdev)
 {
         uint64_t clock;
 
diff --git a/drivers/gpu/drm/radeon/sid.h b/drivers/gpu/drm/radeon/sid.h
index 07fc455e35ae..23fc08fc8e7f 100644
--- a/drivers/gpu/drm/radeon/sid.h
+++ b/drivers/gpu/drm/radeon/sid.h
@@ -58,6 +58,11 @@
 #define VGA_HDP_CONTROL                                 0x328
 #define         VGA_MEMORY_DISABLE                              (1 << 4)
 
+#define CG_CLKPIN_CNTL                                    0x660
+#       define XTALIN_DIVIDE                              (1 << 1)
+#define CG_CLKPIN_CNTL_2                                  0x664
+#       define MUX_TCLK_TO_XCLK                           (1 << 8)
+
 #define DMIF_ADDR_CONFIG                                0xBD4
 
 #define SRBM_STATUS                                     0xE50