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drm/radeon: add a asic callback to get the xclk

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This is required to get the reference clock used
by the gfx engine for things like timestamps. Fixes
support for GL extensions the use timestamps on
certain boards.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2013-02-14 10:04:02 -05:00
parent 0e34d0945e
commit 454d2e2a32
9 changed files with 93 additions and 1 deletions
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27
drivers/gpu/drm/radeon/si.c
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@@ -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)
{