nouveau_dp.c 2.8 KB
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/*
 * Copyright 2009 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

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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];

	if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
		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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int
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;
	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];
	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,
		     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)
		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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}