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
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -78,6 +78,28 @@
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] =