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drm/amdgpu/si: implement get/set pcie_lanes asic callback

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commit 20ca25e86c upstream.

Required for dpm setup on some asics. Fixes a NULL dereference
on asics that require it.

Acked-by: Christian König <christian.koenig@amd.com>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=102553
Tested-by: Abel Garcia Dorta <mercuriete@yahoo.es>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Deucher
2018-04-03 12:54:33 -05:00
committed by Greg Kroah-Hartman
parent f056e33397
commit f188464e3d
1 changed files with 67 additions and 0 deletions
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67
drivers/gpu/drm/amd/amdgpu/si.c
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@@ -1231,6 +1231,71 @@ static void si_detect_hw_virtualization(struct amdgpu_device *adev)
adev->virt.caps |= AMDGPU_PASSTHROUGH_MODE;
}
static int si_get_pcie_lanes(struct amdgpu_device *adev)
{
u32 link_width_cntl;
if (adev->flags & AMD_IS_APU)
return 0;
link_width_cntl = RREG32_PCIE_PORT(PCIE_LC_LINK_WIDTH_CNTL);
switch ((link_width_cntl & LC_LINK_WIDTH_RD_MASK) >> LC_LINK_WIDTH_RD_SHIFT) {
case LC_LINK_WIDTH_X1:
return 1;
case LC_LINK_WIDTH_X2:
return 2;
case LC_LINK_WIDTH_X4:
return 4;
case LC_LINK_WIDTH_X8:
return 8;
case LC_LINK_WIDTH_X0:
case LC_LINK_WIDTH_X16:
default:
return 16;
}
}
static void si_set_pcie_lanes(struct amdgpu_device *adev, int lanes)
{
u32 link_width_cntl, mask;
if (adev->flags & AMD_IS_APU)
return;
switch (lanes) {
case 0:
mask = LC_LINK_WIDTH_X0;
break;
case 1:
mask = LC_LINK_WIDTH_X1;
break;
case 2:
mask = LC_LINK_WIDTH_X2;
break;
case 4:
mask = LC_LINK_WIDTH_X4;
break;
case 8:
mask = LC_LINK_WIDTH_X8;
break;
case 16:
mask = LC_LINK_WIDTH_X16;
break;
default:
DRM_ERROR("invalid pcie lane request: %d\n", lanes);
return;
}
link_width_cntl = RREG32_PCIE_PORT(PCIE_LC_LINK_WIDTH_CNTL);
link_width_cntl &= ~LC_LINK_WIDTH_MASK;
link_width_cntl |= mask << LC_LINK_WIDTH_SHIFT;
link_width_cntl |= (LC_RECONFIG_NOW |
LC_RECONFIG_ARC_MISSING_ESCAPE);
WREG32_PCIE_PORT(PCIE_LC_LINK_WIDTH_CNTL, link_width_cntl);
}
static const struct amdgpu_asic_funcs si_asic_funcs =
{
.read_disabled_bios = &si_read_disabled_bios,
@@ -1241,6 +1306,8 @@ static const struct amdgpu_asic_funcs si_asic_funcs =
.get_xclk = &si_get_xclk,
.set_uvd_clocks = &si_set_uvd_clocks,
.set_vce_clocks = NULL,
.get_pcie_lanes = &si_get_pcie_lanes,
.set_pcie_lanes = &si_set_pcie_lanes,
.get_config_memsize = &si_get_config_memsize,
};