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Diffstat (limited to 'drivers/gpu/drm/radeon/rv770.c')
-rw-r--r-- | drivers/gpu/drm/radeon/rv770.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c index 1b2444f..d63fe1d 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]; |