[linux-2.6-block.git] / drivers / gpu / drm / nouveau / nouveau_dp.c

/*
 * 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
 */

#include <drm/display/drm_dp_helper.h>

#include "nouveau_drv.h"
#include "nouveau_connector.h"
#include "nouveau_encoder.h"
#include "nouveau_crtc.h"

#include <nvif/class.h>
#include <nvif/cl5070.h>

MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
static int nouveau_mst = 1;
module_param_named(mst, nouveau_mst, int, 0400);

static bool
nouveau_dp_has_sink_count(struct drm_connector *connector,
			  struct nouveau_encoder *outp)
{
	return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc);
}

static enum drm_connector_status
nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
		      struct nouveau_encoder *outp)
{
	struct drm_connector *connector = &nv_connector->base;
	struct drm_dp_aux *aux = &nv_connector->aux;
	struct nv50_mstm *mstm = NULL;
	enum drm_connector_status status = connector_status_disconnected;
	int ret;
	u8 *dpcd = outp->dp.dpcd;

	ret = drm_dp_read_dpcd_caps(aux, dpcd);
	if (ret < 0)
		goto out;

	ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd));
	if (ret < 0)
		goto out;

	if (nouveau_mst) {
		mstm = outp->dp.mstm;
		if (mstm)
			mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd);
	}

	if (nouveau_dp_has_sink_count(connector, outp)) {
		ret = drm_dp_read_sink_count(aux);
		if (ret < 0)
			goto out;

		outp->dp.sink_count = ret;

		/*
		 * Dongle connected, but no display. Don't bother reading
		 * downstream port info
		 */
		if (!outp->dp.sink_count)
			return connector_status_disconnected;
	}

	ret = drm_dp_read_downstream_info(aux, dpcd,
					  outp->dp.downstream_ports);
	if (ret < 0)
		goto out;

	status = connector_status_connected;
out:
	if (status != connector_status_connected) {
		/* Clear any cached info */
		outp->dp.sink_count = 0;
	}
	return status;
}

int
nouveau_dp_detect(struct nouveau_connector *nv_connector,
		  struct nouveau_encoder *nv_encoder)
{
	struct drm_device *dev = nv_encoder->base.base.dev;
	struct nouveau_drm *drm = nouveau_drm(dev);
	struct drm_connector *connector = &nv_connector->base;
	struct nv50_mstm *mstm = nv_encoder->dp.mstm;
	enum drm_connector_status status;
	u8 *dpcd = nv_encoder->dp.dpcd;
	int ret = NOUVEAU_DP_NONE, hpd;

	/* If we've already read the DPCD on an eDP device, we don't need to
	 * reread it as it won't change
	 */
	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP &&
	    dpcd[DP_DPCD_REV] != 0)
		return NOUVEAU_DP_SST;

	mutex_lock(&nv_encoder->dp.hpd_irq_lock);
	if (mstm) {
		/* If we're not ready to handle MST state changes yet, just
		 * report the last status of the connector. We'll reprobe it
		 * once we've resumed.
		 */
		if (mstm->suspended) {
			if (mstm->is_mst)
				ret = NOUVEAU_DP_MST;
			else if (connector->status ==
				 connector_status_connected)
				ret = NOUVEAU_DP_SST;

			goto out;
		}
	}

	/* Check status of HPD pin before attempting an AUX transaction that
	 * would result in a number of (futile) retries on a connector which
	 * has no display plugged.
	 *
	 * TODO: look into checking this before probing I2C to detect DVI/HDMI
	 */
	hpd = nvif_conn_hpd_status(&nv_connector->conn);
	if (hpd == NVIF_CONN_HPD_STATUS_NOT_PRESENT)
		goto out;

	status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder);
	if (status == connector_status_disconnected)
		goto out;

	/* If we're in MST mode, we're done here */
	if (mstm && mstm->can_mst && mstm->is_mst) {
		ret = NOUVEAU_DP_MST;
		goto out;
	}

	nv_encoder->dp.link_bw = 27000 * dpcd[DP_MAX_LINK_RATE];
	nv_encoder->dp.link_nr =
		dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;

	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) {
		struct drm_dp_aux *aux = &nv_connector->aux;
		int ret, i;
		u8 sink_rates[16];

		ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, sink_rates, sizeof(sink_rates));
		if (ret == sizeof(sink_rates)) {
			for (i = 0; i < ARRAY_SIZE(sink_rates); i += 2) {
				int val = ((sink_rates[i + 1] << 8) | sink_rates[i]) * 200 / 10;
				if (val && (i == 0 || val > nv_encoder->dp.link_bw))
					nv_encoder->dp.link_bw = val;
			}
		}
	}

	NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
		 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw,
		 dpcd[DP_DPCD_REV]);
	NV_DEBUG(drm, "encoder: %dx%d\n",
		 nv_encoder->dcb->dpconf.link_nr,
		 nv_encoder->dcb->dpconf.link_bw);

	if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr)
		nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
	if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw)
		nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw;

	NV_DEBUG(drm, "maximum: %dx%d\n",
		 nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);

	if (mstm && mstm->can_mst) {
		ret = nv50_mstm_detect(nv_encoder);
		if (ret == 1) {
			ret = NOUVEAU_DP_MST;
			goto out;
		} else if (ret != 0) {
			goto out;
		}
	}
	ret = NOUVEAU_DP_SST;

out:
	if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST)
		nv50_mstm_remove(mstm);

	mutex_unlock(&nv_encoder->dp.hpd_irq_lock);
	return ret;
}

void nouveau_dp_irq(struct nouveau_drm *drm,
		    struct nouveau_connector *nv_connector)
{
	struct drm_connector *connector = &nv_connector->base;
	struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
	struct nv50_mstm *mstm;
	int ret;
	bool send_hpd = false;

	if (!outp)
		return;

	mstm = outp->dp.mstm;
	NV_DEBUG(drm, "service %s\n", connector->name);

	mutex_lock(&outp->dp.hpd_irq_lock);

	if (mstm && mstm->is_mst) {
		if (!nv50_mstm_service(drm, nv_connector, mstm))
			send_hpd = true;
	} else {
		drm_dp_cec_irq(&nv_connector->aux);

		if (nouveau_dp_has_sink_count(connector, outp)) {
			ret = drm_dp_read_sink_count(&nv_connector->aux);
			if (ret != outp->dp.sink_count)
				send_hpd = true;
			if (ret >= 0)
				outp->dp.sink_count = ret;
		}
	}

	mutex_unlock(&outp->dp.hpd_irq_lock);

	if (send_hpd)
		nouveau_connector_hpd(connector);
}

/* TODO:
 * - Use the minimum possible BPC here, once we add support for the max bpc
 *   property.
 * - Validate against the DP caps advertised by the GPU (we don't check these
 *   yet)
 */
enum drm_mode_status
nv50_dp_mode_valid(struct drm_connector *connector,
		   struct nouveau_encoder *outp,
		   const struct drm_display_mode *mode,
		   unsigned *out_clock)
{
	const unsigned int min_clock = 25000;
	unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock;
	const u8 bpp = connector->display_info.bpc * 3;

	if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace)
		return MODE_NO_INTERLACE;

	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
		clock *= 2;

	max_rate = outp->dp.link_nr * outp->dp.link_bw;
	mode_rate = DIV_ROUND_UP(clock * bpp, 8);
	if (mode_rate > max_rate)
		return MODE_CLOCK_HIGH;

	ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports);
	if (ds_max_dotclock && clock > ds_max_dotclock)
		return MODE_CLOCK_HIGH;

	if (clock < min_clock)
		return MODE_CLOCK_LOW;

	if (out_clock)
		*out_clock = clock;

	return MODE_OK;
}
Commit	Line	Data
6ee73861 BS	1	/*
	2	* Copyright 2009 Red Hat Inc.
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	18	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	19	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	20	* OTHER DEALINGS IN THE SOFTWARE.
	21	*
	22	* Authors: Ben Skeggs
	23	*/
	24
da68386d	25	#include <drm/display/drm_dp_helper.h>
b01f0608	26
4dc28134	27	#include "nouveau_drv.h"
b01f0608	28	#include "nouveau_connector.h"
6ee73861	29	#include "nouveau_encoder.h"
27a45987	30	#include "nouveau_crtc.h"
6ee73861	31
52aa30f2 BS	32	#include <nvif/class.h>
	33	#include <nvif/cl5070.h>
	34
f479c0ba BS	35	MODULE_PARM_DESC(mst, "Enable DisplayPort multi-stream (default: enabled)");
	36	static int nouveau_mst = 1;
	37	module_param_named(mst, nouveau_mst, int, 0400);
	38
a4efad35 LP	39	static bool
	40	nouveau_dp_has_sink_count(struct drm_connector *connector,
	41	struct nouveau_encoder *outp)
	42	{
	43	return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc);
	44	}
	45
a0922278 LP	46	static enum drm_connector_status
	47	nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
	48	struct nouveau_encoder *outp)
	49	{
a4efad35	50	struct drm_connector *connector = &nv_connector->base;
a0922278 LP	51	struct drm_dp_aux *aux = &nv_connector->aux;
a0922278 LP	52	struct nv50_mstm *mstm = NULL;
a4efad35	53	enum drm_connector_status status = connector_status_disconnected;
a0922278 LP	54	int ret;
a0922278 LP	55	u8 *dpcd = outp->dp.dpcd;
a0922278	56
79416e97 LP	57	ret = drm_dp_read_dpcd_caps(aux, dpcd);
	58	if (ret < 0)
	59	goto out;
	60
	61	ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd));
	62	if (ret < 0)
a4efad35	63	goto out;
a0922278	64
8b75e83e	65	if (nouveau_mst) {
a0922278	66	mstm = outp->dp.mstm;
8b75e83e LP	67	if (mstm)
8b75e83e LP	68	mstm->can_mst = drm_dp_read_mst_cap(aux, dpcd);
a0922278 LP	69	}
a0922278 LP	70
a4efad35 LP	71	if (nouveau_dp_has_sink_count(connector, outp)) {
	72	ret = drm_dp_read_sink_count(aux);
	73	if (ret < 0)
	74	goto out;
	75
	76	outp->dp.sink_count = ret;
	77
	78	/*
	79	* Dongle connected, but no display. Don't bother reading
	80	* downstream port info
	81	*/
	82	if (!outp->dp.sink_count)
	83	return connector_status_disconnected;
	84	}
	85
409d3813 LP	86	ret = drm_dp_read_downstream_info(aux, dpcd,
	87	outp->dp.downstream_ports);
	88	if (ret < 0)
a4efad35	89	goto out;
409d3813	90
a4efad35 LP	91	status = connector_status_connected;
	92	out:
	93	if (status != connector_status_connected) {
	94	/* Clear any cached info */
	95	outp->dp.sink_count = 0;
	96	}
	97	return status;
a0922278 LP	98	}
a0922278 LP	99
8777c5c1	100	int
6ba11932 LP	101	nouveau_dp_detect(struct nouveau_connector *nv_connector,
6ba11932 LP	102	struct nouveau_encoder *nv_encoder)
6ee73861	103	{
8777c5c1	104	struct drm_device *dev = nv_encoder->base.base.dev;
77145f1c	105	struct nouveau_drm *drm = nouveau_drm(dev);
a0922278 LP	106	struct drm_connector *connector = &nv_connector->base;
	107	struct nv50_mstm *mstm = nv_encoder->dp.mstm;
	108	enum drm_connector_status status;
	109	u8 *dpcd = nv_encoder->dp.dpcd;
32dd9236	110	int ret = NOUVEAU_DP_NONE, hpd;
a0922278 LP	111
	112	/* If we've already read the DPCD on an eDP device, we don't need to
	113	* reread it as it won't change
	114	*/
	115	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP &&
	116	dpcd[DP_DPCD_REV] != 0)
	117	return NOUVEAU_DP_SST;
6ee73861	118
a0922278 LP	119	mutex_lock(&nv_encoder->dp.hpd_irq_lock);
	120	if (mstm) {
	121	/* If we're not ready to handle MST state changes yet, just
	122	* report the last status of the connector. We'll reprobe it
	123	* once we've resumed.
	124	*/
	125	if (mstm->suspended) {
	126	if (mstm->is_mst)
	127	ret = NOUVEAU_DP_MST;
	128	else if (connector->status ==
	129	connector_status_connected)
	130	ret = NOUVEAU_DP_SST;
	131
	132	goto out;
	133	}
	134	}
	135
32dd9236 BS	136	/* Check status of HPD pin before attempting an AUX transaction that
	137	* would result in a number of (futile) retries on a connector which
	138	* has no display plugged.
	139	*
	140	* TODO: look into checking this before probing I2C to detect DVI/HDMI
	141	*/
	142	hpd = nvif_conn_hpd_status(&nv_connector->conn);
	143	if (hpd == NVIF_CONN_HPD_STATUS_NOT_PRESENT)
	144	goto out;
	145
a0922278 LP	146	status = nouveau_dp_probe_dpcd(nv_connector, nv_encoder);
	147	if (status == connector_status_disconnected)
	148	goto out;
	149
	150	/* If we're in MST mode, we're done here */
	151	if (mstm && mstm->can_mst && mstm->is_mst) {
	152	ret = NOUVEAU_DP_MST;
	153	goto out;
	154	}
6ee73861	155
57940402 LP	156	nv_encoder->dp.link_bw = 27000 * dpcd[DP_MAX_LINK_RATE];
	157	nv_encoder->dp.link_nr =
	158	dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
6ee73861	159
70704fbf BS	160	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) {
	161	struct drm_dp_aux *aux = &nv_connector->aux;
	162	int ret, i;
	163	u8 sink_rates[16];
	164
	165	ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, sink_rates, sizeof(sink_rates));
	166	if (ret == sizeof(sink_rates)) {
	167	for (i = 0; i < ARRAY_SIZE(sink_rates); i += 2) {
	168	int val = ((sink_rates[i + 1] << 8) \| sink_rates[i]) * 200 / 10;
	169	if (val && (i == 0 \|\| val > nv_encoder->dp.link_bw))
	170	nv_encoder->dp.link_bw = val;
	171	}
	172	}
	173	}
	174
77145f1c	175	NV_DEBUG(drm, "display: %dx%d dpcd 0x%02x\n",
57940402 LP	176	nv_encoder->dp.link_nr, nv_encoder->dp.link_bw,
57940402 LP	177	dpcd[DP_DPCD_REV]);
77145f1c	178	NV_DEBUG(drm, "encoder: %dx%d\n",
bbcd521e LP	179	nv_encoder->dcb->dpconf.link_nr,
bbcd521e LP	180	nv_encoder->dcb->dpconf.link_bw);
6ee73861	181
75a1fccf	182	if (nv_encoder->dcb->dpconf.link_nr < nv_encoder->dp.link_nr)
6ee73861	183	nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
75a1fccf BS	184	if (nv_encoder->dcb->dpconf.link_bw < nv_encoder->dp.link_bw)
75a1fccf BS	185	nv_encoder->dp.link_bw = nv_encoder->dcb->dpconf.link_bw;
6ee73861	186
77145f1c	187	NV_DEBUG(drm, "maximum: %dx%d\n",
bbcd521e	188	nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
fe224bb7	189
a0922278 LP	190	if (mstm && mstm->can_mst) {
	191	ret = nv50_mstm_detect(nv_encoder);
	192	if (ret == 1) {
	193	ret = NOUVEAU_DP_MST;
	194	goto out;
	195	} else if (ret != 0) {
	196	goto out;
	197	}
6ba11932	198	}
a0922278	199	ret = NOUVEAU_DP_SST;
52aa30f2	200
a0922278 LP	201	out:
	202	if (mstm && !mstm->suspended && ret != NOUVEAU_DP_MST)
	203	nv50_mstm_remove(mstm);
	204
	205	mutex_unlock(&nv_encoder->dp.hpd_irq_lock);
52aa30f2	206	return ret;
6ee73861	207	}
d6a9efec	208
a0922278 LP	209	void nouveau_dp_irq(struct nouveau_drm *drm,
	210	struct nouveau_connector *nv_connector)
	211	{
	212	struct drm_connector *connector = &nv_connector->base;
	213	struct nouveau_encoder *outp = find_encoder(connector, DCB_OUTPUT_DP);
	214	struct nv50_mstm *mstm;
a4efad35 LP	215	int ret;
a4efad35 LP	216	bool send_hpd = false;
a0922278 LP	217
	218	if (!outp)
	219	return;
	220
	221	mstm = outp->dp.mstm;
	222	NV_DEBUG(drm, "service %s\n", connector->name);
	223
	224	mutex_lock(&outp->dp.hpd_irq_lock);
	225
	226	if (mstm && mstm->is_mst) {
	227	if (!nv50_mstm_service(drm, nv_connector, mstm))
a4efad35	228	send_hpd = true;
a0922278 LP	229	} else {
a0922278 LP	230	drm_dp_cec_irq(&nv_connector->aux);
a4efad35 LP	231
	232	if (nouveau_dp_has_sink_count(connector, outp)) {
	233	ret = drm_dp_read_sink_count(&nv_connector->aux);
	234	if (ret != outp->dp.sink_count)
	235	send_hpd = true;
	236	if (ret >= 0)
	237	outp->dp.sink_count = ret;
	238	}
a0922278 LP	239	}
	240
	241	mutex_unlock(&outp->dp.hpd_irq_lock);
a4efad35 LP	242
	243	if (send_hpd)
	244	nouveau_connector_hpd(connector);
a0922278 LP	245	}
a0922278 LP	246
d6a9efec LP	247	/* TODO:
	248	* - Use the minimum possible BPC here, once we add support for the max bpc
	249	* property.
d6a9efec LP	250	* - Validate against the DP caps advertised by the GPU (we don't check these
	251	* yet)
	252	*/
	253	enum drm_mode_status
	254	nv50_dp_mode_valid(struct drm_connector *connector,
	255	struct nouveau_encoder *outp,
	256	const struct drm_display_mode *mode,
	257	unsigned *out_clock)
	258	{
d7787cc0 LP	259	const unsigned int min_clock = 25000;
	260	unsigned int max_rate, mode_rate, ds_max_dotclock, clock = mode->clock;
	261	const u8 bpp = connector->display_info.bpc * 3;
d6a9efec LP	262
	263	if (mode->flags & DRM_MODE_FLAG_INTERLACE && !outp->caps.dp_interlace)
	264	return MODE_NO_INTERLACE;
	265
2d831155 LP	266	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
	267	clock *= 2;
	268
d7787cc0 LP	269	max_rate = outp->dp.link_nr * outp->dp.link_bw;
	270	mode_rate = DIV_ROUND_UP(clock * bpp, 8);
	271	if (mode_rate > max_rate)
	272	return MODE_CLOCK_HIGH;
	273
	274	ds_max_dotclock = drm_dp_downstream_max_dotclock(outp->dp.dpcd, outp->dp.downstream_ports);
	275	if (ds_max_dotclock && clock > ds_max_dotclock)
	276	return MODE_CLOCK_HIGH;
d6a9efec	277
2d831155 LP	278	if (clock < min_clock)
2d831155 LP	279	return MODE_CLOCK_LOW;
2d831155	280
d6a9efec LP	281	if (out_clock)
d6a9efec LP	282	*out_clock = clock;
2d831155 LP	283
2d831155 LP	284	return MODE_OK;
d6a9efec	285	}