mirror of https://gitee.com/openkylin/linux.git
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/*
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* Copyright 2009 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs
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*/
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#include <drm/drmP.h>
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#include <drm/drm_dp_helper.h>
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#include "nouveau_drm.h"
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#include "nouveau_connector.h"
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#include "nouveau_encoder.h"
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#include "nouveau_crtc.h"
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static void
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nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_aux *aux, u8 *dpcd)
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{
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struct nouveau_drm *drm = nouveau_drm(dev);
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u8 buf[3];
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if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
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return;
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if (!nvkm_rdaux(aux, DP_SINK_OUI, buf, 3))
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NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n",
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buf[0], buf[1], buf[2]);
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if (!nvkm_rdaux(aux, DP_BRANCH_OUI, buf, 3))
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NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n",
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buf[0], buf[1], buf[2]);
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}
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int
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nouveau_dp_detect(struct nouveau_encoder *nv_encoder)
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{
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struct drm_device *dev = nv_encoder->base.base.dev;
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struct nouveau_drm *drm = nouveau_drm(dev);
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struct nvkm_i2c_aux *aux;
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u8 *dpcd = nv_encoder->dp.dpcd;
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int ret;
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aux = nv_encoder->aux;
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if (!aux)
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return -ENODEV;
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ret = nvkm_rdaux(aux, DP_DPCD_REV, dpcd, 8);
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if (ret)
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return ret;
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nv_encoder->dp.link_bw = 27000 * dpcd[1];
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nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
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NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
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nv_encoder->dp.link_nr, nv_encoder->dp.link_bw, dpcd[0]);
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NV_DEBUG(drm, "encoder: %dx%d\n",
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nv_encoder->dcb->dpconf.link_nr,
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nv_encoder->dcb->dpconf.link_bw);
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if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr)
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nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
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if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw)
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nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw;
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NV_DEBUG(drm, "maximum: %dx%d\n",
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nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
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nouveau_dp_probe_oui(dev, aux, dpcd);
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return 0;
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}
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