drm/radeon: add get_xclk() callback for CIK

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index cbfb028..445f497 100644 (file)
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -78,6 +78,28 @@ extern void si_rlc_fini(struct radeon_device *rdev);
 extern int si_rlc_init(struct radeon_device *rdev);
 static void cik_rlc_stop(struct radeon_device *rdev);
 
+/**
+ * cik_get_xclk - get the xclk
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Returns the reference clock used by the gfx engine
+ * (CIK).
+ */
+u32 cik_get_xclk(struct radeon_device *rdev)
+{
+        u32 reference_clock = rdev->clock.spll.reference_freq;
+
+       if (rdev->flags & RADEON_IS_IGP) {
+               if (RREG32_SMC(GENERAL_PWRMGT) & GPU_COUNTER_CLK)
+                       return reference_clock / 2;
+       } else {
+               if (RREG32_SMC(CG_CLKPIN_CNTL) & XTALIN_DIVIDE)
+                       return reference_clock / 4;
+       }
+       return reference_clock;
+}
+
 #define BONAIRE_IO_MC_REGS_SIZE 36
 
 static const u32 bonaire_io_mc_regs[BONAIRE_IO_MC_REGS_SIZE][2] =

diff --git a/drivers/gpu/drm/radeon/cikd.h b/drivers/gpu/drm/radeon/cikd.h
index 8afb334..f00e273 100644 (file)
--- a/drivers/gpu/drm/radeon/cikd.h
+++ b/drivers/gpu/drm/radeon/cikd.h
@@ -28,6 +28,13 @@
 
 #define CIK_RB_BITMAP_WIDTH_PER_SH  2
 
+/* SMC IND registers */
+#define GENERAL_PWRMGT                                    0xC0200000
+#       define GPU_COUNTER_CLK                            (1 << 15)
+
+#define CG_CLKPIN_CNTL                                    0xC05001A0
+#       define XTALIN_DIVIDE                              (1 << 1)
+
 #define VGA_HDP_CONTROL                                0x328
 #define                VGA_MEMORY_DISABLE                              (1 << 4)
 

diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
index 248da72..05f75f7 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_asic.h
+++ b/drivers/gpu/drm/radeon/radeon_asic.h
@@ -557,5 +557,6 @@ int si_set_uvd_clocks(struct radeon_device *rdev, u32 vclk, u32 dclk);
  * cik
  */
 uint64_t cik_get_gpu_clock_counter(struct radeon_device *rdev);
+u32 cik_get_xclk(struct radeon_device *rdev);
 
 #endif