Ported from radeon.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/si.c | 92 ++++++++++++++++++++++++++++++++-
1 file changed, 90 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/si.c b/drivers/gpu/drm/amd/amdgpu/si.c
index 1b449291f068..a7a45f06c8f3 100644
--- a/drivers/gpu/drm/amd/amdgpu/si.c
+++ b/drivers/gpu/drm/amd/amdgpu/si.c
@@ -1215,10 +1215,98 @@ static bool si_read_bios_from_rom(struct amdgpu_device *adev,
return true;
}
-//xxx: not implemented
+static void si_set_clk_bypass_mode(struct amdgpu_device *adev)
+{
+ u32 tmp, i;
+
+ tmp = RREG32(CG_SPLL_FUNC_CNTL);
+ tmp |= SPLL_BYPASS_EN;
+ WREG32(CG_SPLL_FUNC_CNTL, tmp);
+
+ tmp = RREG32(CG_SPLL_FUNC_CNTL_2);
+ tmp |= SPLL_CTLREQ_CHG;
+ WREG32(CG_SPLL_FUNC_CNTL_2, tmp);
+
+ for (i = 0; i < adev->usec_timeout; i++) {
+ if (RREG32(SPLL_STATUS) & SPLL_CHG_STATUS)
+ break;
+ udelay(1);
+ }
+
+ tmp = RREG32(CG_SPLL_FUNC_CNTL_2);
+ tmp &= ~(SPLL_CTLREQ_CHG | SCLK_MUX_UPDATE);
+ WREG32(CG_SPLL_FUNC_CNTL_2, tmp);
+
+ tmp = RREG32(MPLL_CNTL_MODE);
+ tmp &= ~MPLL_MCLK_SEL;
+ WREG32(MPLL_CNTL_MODE, tmp);
+}
+
+static void si_spll_powerdown(struct amdgpu_device *adev)
+{
+ u32 tmp;
+
+ tmp = RREG32(SPLL_CNTL_MODE);
+ tmp |= SPLL_SW_DIR_CONTROL;
+ WREG32(SPLL_CNTL_MODE, tmp);
+
+ tmp = RREG32(CG_SPLL_FUNC_CNTL);
+ tmp |= SPLL_RESET;
+ WREG32(CG_SPLL_FUNC_CNTL, tmp);
+
+ tmp = RREG32(CG_SPLL_FUNC_CNTL);
+ tmp |= SPLL_SLEEP;
+ WREG32(CG_SPLL_FUNC_CNTL, tmp);
+
+ tmp = RREG32(SPLL_CNTL_MODE);
+ tmp &= ~SPLL_SW_DIR_CONTROL;
+ WREG32(SPLL_CNTL_MODE, tmp);
+}
+
+static int si_gpu_pci_config_reset(struct amdgpu_device *adev)
+{
+ u32 i;
+ int r = -EINVAL;
+
+ dev_info(adev->dev, "GPU pci config reset\n");
+
+ /* set mclk/sclk to bypass */
+ si_set_clk_bypass_mode(adev);
+ /* powerdown spll */
+ si_spll_powerdown(adev);
+ /* disable BM */
+ pci_clear_master(adev->pdev);
+ /* reset */
+ amdgpu_device_pci_config_reset(adev);
+
+ udelay(100);
+
+ /* wait for asic to come out of reset */
+ for (i = 0; i < adev->usec_timeout; i++) {
+ if (RREG32(mmCONFIG_MEMSIZE) != 0xffffffff) {
+ /* enable BM */
+ pci_set_master(adev->pdev);
+ adev->has_hw_reset = true;
+ r = 0;
+ break;
+ }
+ udelay(1);
+ }
+
+ return r;
+}
+
static int si_asic_reset(struct amdgpu_device *adev)
{
- return 0;
+ int r;
+
+ amdgpu_atombios_scratch_regs_engine_hung(adev, true);
+
+ r = si_gpu_pci_config_reset(adev);
+
+ amdgpu_atombios_scratch_regs_engine_hung(adev, false);
+
+ return r;
}
static bool si_asic_supports_baco(struct amdgpu_device *adev)
--
2.25.4
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