[PATCH 4.14 199/237] drm/amdgpu/soc15: fix xclk for raven

Greg Kroah-Hartman
2020-02-27T14:32:16Z

From: Alex Deucher <alexander.deucher@amd.com>

commit c657b936ea98630ef5ba4f130ab1ad5c534d0165 upstream.

It's 25 Mhz (refclk / 4). This fixes the interpretation
of the rlc clock counter.

Acked-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/amdgpu/soc15.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/soc15.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
@@ -279,7 +279,12 @@ static void soc15_init_golden_registers(
}
static u32 soc15_get_xclk(struct amdgpu_device *adev)
{
- return adev->clock.spll.reference_freq;
+ u32 reference_clock = adev->clock.spll.reference_freq;
+
+ if (adev->asic_type == CHIP_RAVEN)
+ return reference_clock / 4;
+
+ return reference_clock;
}