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57940402b5
No functional changes. Signed-off-by: Lyude Paul <lyude@redhat.com> Reviewed-by: Ben Skeggs <bskeggs@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200826182456.322681-5-lyude@redhat.com
118 lines
3.8 KiB
C
118 lines
3.8 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/drm_dp_helper.h>
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#include "nouveau_drv.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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#include <nvif/class.h>
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#include <nvif/cl5070.h>
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MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
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static int nouveau_mst = 1;
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module_param_named(mst, nouveau_mst, int, 0400);
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int
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nouveau_dp_detect(struct nouveau_connector *nv_connector,
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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 drm_dp_aux *aux = &nv_connector->aux;
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u8 dpcd[DP_RECEIVER_CAP_SIZE];
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int ret;
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ret = drm_dp_dpcd_read(aux, DP_DPCD_REV, dpcd, DP_RECEIVER_CAP_SIZE);
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if (ret != sizeof(dpcd))
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return ret;
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nv_encoder->dp.link_bw = 27000 * dpcd[DP_MAX_LINK_RATE];
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nv_encoder->dp.link_nr =
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dpcd[DP_MAX_LANE_COUNT] & 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,
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dpcd[DP_DPCD_REV]);
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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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ret = drm_dp_read_desc(&nv_connector->aux, &nv_encoder->dp.desc,
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drm_dp_is_branch(dpcd));
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if (ret) {
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NV_ERROR(drm, "Failed to read DP descriptor on %s: %d\n",
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nv_connector->base.name, ret);
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return ret;
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}
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ret = nv50_mstm_detect(nv_encoder->dp.mstm, dpcd, nouveau_mst);
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if (ret == 1)
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return NOUVEAU_DP_MST;
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if (ret == 0)
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return NOUVEAU_DP_SST;
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return ret;
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}
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/* TODO:
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* - Use the minimum possible BPC here, once we add support for the max bpc
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* property.
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* - Validate the mode against downstream port caps (see
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* drm_dp_downstream_max_clock())
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* - Validate against the DP caps advertised by the GPU (we don't check these
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* yet)
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*/
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enum drm_mode_status
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nv50_dp_mode_valid(struct drm_connector *connector,
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struct nouveau_encoder *outp,
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const struct drm_display_mode *mode,
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unsigned *out_clock)
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{
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const unsigned min_clock = 25000;
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unsigned max_clock, clock;
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enum drm_mode_status ret;
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if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace)
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return MODE_NO_INTERLACE;
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max_clock = outp->dp.link_nr * outp->dp.link_bw;
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clock = mode->clock * (connector->display_info.bpc * 3) / 10;
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ret = nouveau_conn_mode_clock_valid(mode, min_clock, max_clock,
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&clock);
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if (out_clock)
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*out_clock = clock;
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return ret;
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}
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