From: Alex Deucher Date: Mon, 2 Apr 2018 17:29:26 +0000 (-0500) Subject: drm/amdgpu: Fix PCIe lane width calculation X-Git-Tag: v4.19~1144^2~6^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=41212e2fe72b26ded7ed78224d9eab720c2891e2;p=platform%2Fkernel%2Flinux-rpi3.git drm/amdgpu: Fix PCIe lane width calculation The calculation of the lane widths via ATOM_PPLIB_PCIE_LINK_WIDTH_MASK and ATOM_PPLIB_PCIE_LINK_WIDTH_SHIFT macros did not increment the resulting value, per the comment in pptable.h ("lanes - 1"), and per usage elsewhere. Port of the radeon fix to amdgpu. Acked-by: Christian König Acked-by: Chunming Zhou Bug: https://bugs.freedesktop.org/show_bug.cgi?id=102553 Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org --- diff --git a/drivers/gpu/drm/amd/amdgpu/si_dpm.c b/drivers/gpu/drm/amd/amdgpu/si_dpm.c index 672eaff..797d505 100644 --- a/drivers/gpu/drm/amd/amdgpu/si_dpm.c +++ b/drivers/gpu/drm/amd/amdgpu/si_dpm.c @@ -6372,9 +6372,9 @@ static void si_set_pcie_lane_width_in_smc(struct amdgpu_device *adev, { u32 lane_width; u32 new_lane_width = - (amdgpu_new_state->caps & ATOM_PPLIB_PCIE_LINK_WIDTH_MASK) >> ATOM_PPLIB_PCIE_LINK_WIDTH_SHIFT; + ((amdgpu_new_state->caps & ATOM_PPLIB_PCIE_LINK_WIDTH_MASK) >> ATOM_PPLIB_PCIE_LINK_WIDTH_SHIFT) + 1; u32 current_lane_width = - (amdgpu_current_state->caps & ATOM_PPLIB_PCIE_LINK_WIDTH_MASK) >> ATOM_PPLIB_PCIE_LINK_WIDTH_SHIFT; + ((amdgpu_current_state->caps & ATOM_PPLIB_PCIE_LINK_WIDTH_MASK) >> ATOM_PPLIB_PCIE_LINK_WIDTH_SHIFT) + 1; if (new_lane_width != current_lane_width) { amdgpu_set_pcie_lanes(adev, new_lane_width);