[PATCH v3 28/44] drm/nouveau/disp: add dp rates method
From: Lyude Paul
Date: Tue Sep 19 2023 - 18:08:48 EST
From: Ben Skeggs <bskeggs@xxxxxxxxxx>
- moves building of link rates table from NVKM to DRM
- preparing to move link training out of supervisor
Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Acked-by: Danilo Krummrich <me@xxxxxxxx>
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
---
drivers/gpu/drm/nouveau/include/nvif/if0012.h | 13 ++
drivers/gpu/drm/nouveau/include/nvif/outp.h | 8 +
drivers/gpu/drm/nouveau/nouveau_dp.c | 143 ++++++++++++++----
drivers/gpu/drm/nouveau/nouveau_encoder.h | 12 +-
drivers/gpu/drm/nouveau/nvif/outp.c | 21 +++
drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c | 66 --------
.../gpu/drm/nouveau/nvkm/engine/disp/outp.h | 1 +
.../gpu/drm/nouveau/nvkm/engine/disp/uoutp.c | 24 +++
8 files changed, 189 insertions(+), 99 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/include/nvif/if0012.h b/drivers/gpu/drm/nouveau/include/nvif/if0012.h
index 94f1e55b0ce6c..ddc8e3d858235 100644
--- a/drivers/gpu/drm/nouveau/include/nvif/if0012.h
+++ b/drivers/gpu/drm/nouveau/include/nvif/if0012.h
@@ -33,6 +33,7 @@ union nvif_outp_args {
#define NVIF_OUTP_V0_DP_AUX_PWR 0x70
#define NVIF_OUTP_V0_DP_AUX_XFER 0x71
+#define NVIF_OUTP_V0_DP_RATES 0x72
#define NVIF_OUTP_V0_DP_RETRAIN 0x73
#define NVIF_OUTP_V0_DP_MST_VCPI 0x78
@@ -194,6 +195,18 @@ union nvif_outp_dp_aux_xfer_args {
} v0;
};
+union nvif_outp_dp_rates_args {
+ struct nvif_outp_dp_rates_v0 {
+ __u8 version;
+ __u8 pad01[6];
+ __u8 rates;
+ struct {
+ __s8 dpcd;
+ __u32 rate;
+ } rate[8];
+ } v0;
+};
+
union nvif_outp_dp_retrain_args {
struct nvif_outp_dp_retrain_vn {
} vn;
diff --git a/drivers/gpu/drm/nouveau/include/nvif/outp.h b/drivers/gpu/drm/nouveau/include/nvif/outp.h
index dd4dd0e2a7a1d..596d543acd302 100644
--- a/drivers/gpu/drm/nouveau/include/nvif/outp.h
+++ b/drivers/gpu/drm/nouveau/include/nvif/outp.h
@@ -59,6 +59,14 @@ int nvif_outp_hda_eld(struct nvif_outp *, int head, void *data, u32 size);
int nvif_outp_dp_aux_pwr(struct nvif_outp *, bool enable);
int nvif_outp_dp_aux_xfer(struct nvif_outp *, u8 type, u8 *size, u32 addr, u8 *data);
+
+struct nvif_outp_dp_rate {
+ int dpcd; /* -1 for non-indexed rates */
+ u32 rate;
+};
+
+int nvif_outp_dp_rates(struct nvif_outp *, struct nvif_outp_dp_rate *rate, int rate_nr);
+
int nvif_outp_dp_retrain(struct nvif_outp *);
int nvif_outp_dp_mst_vcpi(struct nvif_outp *, int head,
u8 start_slot, u8 num_slots, u16 pbn, u16 aligned_pbn);
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 01aa9b9c74a2a..f26769bca1950 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -42,6 +42,21 @@ nouveau_dp_has_sink_count(struct drm_connector *connector,
return drm_dp_read_sink_count_cap(connector, outp->dp.dpcd, &outp->dp.desc);
}
+static bool
+nouveau_dp_probe_lttpr(struct nouveau_encoder *outp)
+{
+ u8 rev, size = sizeof(rev);
+ int ret;
+
+ ret = nvif_outp_dp_aux_xfer(&outp->outp, DP_AUX_NATIVE_READ, &size,
+ DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV,
+ &rev);
+ if (ret || size < sizeof(rev) || rev < 0x14)
+ return false;
+
+ return true;
+}
+
static enum drm_connector_status
nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
struct nouveau_encoder *outp)
@@ -53,10 +68,99 @@ nouveau_dp_probe_dpcd(struct nouveau_connector *nv_connector,
int ret;
u8 *dpcd = outp->dp.dpcd;
+ outp->dp.lttpr.nr = 0;
+ outp->dp.rate_nr = 0;
+ outp->dp.link_nr = 0;
+ outp->dp.link_bw = 0;
+
+ if (connector->connector_type != DRM_MODE_CONNECTOR_eDP &&
+ nouveau_dp_probe_lttpr(outp) &&
+ !drm_dp_read_dpcd_caps(aux, dpcd) &&
+ !drm_dp_read_lttpr_common_caps(aux, dpcd, outp->dp.lttpr.caps)) {
+ int nr = drm_dp_lttpr_count(outp->dp.lttpr.caps);
+
+ if (nr > 0)
+ outp->dp.lttpr.nr = nr;
+ }
+
ret = drm_dp_read_dpcd_caps(aux, dpcd);
if (ret < 0)
goto out;
+ outp->dp.link_nr = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;
+ if (outp->dcb->dpconf.link_nr < outp->dp.link_nr)
+ outp->dp.link_nr = outp->dcb->dpconf.link_nr;
+
+ if (outp->dp.lttpr.nr) {
+ int links = drm_dp_lttpr_max_lane_count(outp->dp.lttpr.caps);
+
+ if (links && links < outp->dp.link_nr)
+ outp->dp.link_nr = links;
+ }
+
+ if (connector->connector_type == DRM_MODE_CONNECTOR_eDP && dpcd[DP_DPCD_REV] >= 0x13) {
+ __le16 rates[DP_MAX_SUPPORTED_RATES];
+
+ ret = drm_dp_dpcd_read(aux, DP_SUPPORTED_LINK_RATES, rates, sizeof(rates));
+ if (ret == sizeof(rates)) {
+ for (int i = 0; i < ARRAY_SIZE(rates); i++) {
+ u32 rate = (le16_to_cpu(rates[i]) * 200) / 10;
+ int j;
+
+ if (!rate)
+ break;
+
+ for (j = 0; j < outp->dp.rate_nr; j++) {
+ if (rate > outp->dp.rate[j].rate) {
+ for (int k = outp->dp.rate_nr; k > j; k--)
+ outp->dp.rate[k] = outp->dp.rate[k - 1];
+ break;
+ }
+ }
+
+ outp->dp.rate[j].dpcd = i;
+ outp->dp.rate[j].rate = rate;
+ outp->dp.rate_nr++;
+ }
+ }
+ }
+
+ if (!outp->dp.rate_nr) {
+ const u32 rates[] = { 810000, 540000, 270000, 162000 };
+ u32 max_rate = dpcd[DP_MAX_LINK_RATE] * 27000;
+
+ if (outp->dp.lttpr.nr) {
+ int rate = drm_dp_lttpr_max_link_rate(outp->dp.lttpr.caps);
+
+ if (rate && rate < max_rate)
+ max_rate = rate;
+ }
+
+ max_rate = min_t(int, max_rate, outp->dcb->dpconf.link_bw);
+
+ for (int i = 0; i < ARRAY_SIZE(rates); i++) {
+ if (rates[i] <= max_rate) {
+ outp->dp.rate[outp->dp.rate_nr].dpcd = -1;
+ outp->dp.rate[outp->dp.rate_nr].rate = rates[i];
+ outp->dp.rate_nr++;
+ }
+ }
+
+ if (WARN_ON(!outp->dp.rate_nr))
+ goto out;
+ }
+
+ ret = nvif_outp_dp_rates(&outp->outp, outp->dp.rate, outp->dp.rate_nr);
+ if (ret)
+ goto out;
+
+ for (int i = 0; i < outp->dp.rate_nr; i++) {
+ u32 link_bw = outp->dp.rate[i].rate;
+
+ if (link_bw > outp->dp.link_bw)
+ outp->dp.link_bw = link_bw;
+ }
+
ret = drm_dp_read_desc(aux, &outp->dp.desc, drm_dp_is_branch(dpcd));
if (ret < 0)
goto out;
@@ -151,39 +255,14 @@ nouveau_dp_detect(struct nouveau_connector *nv_connector,
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, "sink dpcd version: 0x%02x\n", dpcd[DP_DPCD_REV]);
+ for (int i = 0; i < nv_encoder->dp.rate_nr; i++)
+ NV_DEBUG(drm, "sink rate %d: %d\n", i, nv_encoder->dp.rate[i].rate);
- NV_DEBUG(drm, "maximum: %dx%d\n",
- nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
+ NV_DEBUG(drm, "encoder: %dx%d\n", nv_encoder->dcb->dpconf.link_nr,
+ 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);
diff --git a/drivers/gpu/drm/nouveau/nouveau_encoder.h b/drivers/gpu/drm/nouveau/nouveau_encoder.h
index aacdf2814abaa..123d0ecf5f586 100644
--- a/drivers/gpu/drm/nouveau/nouveau_encoder.h
+++ b/drivers/gpu/drm/nouveau/nouveau_encoder.h
@@ -75,6 +75,17 @@ struct nouveau_encoder {
struct {
struct nv50_mstm *mstm;
+
+ struct {
+ u8 caps[DP_LTTPR_COMMON_CAP_SIZE];
+ u8 nr;
+ } lttpr;
+
+ u8 dpcd[DP_RECEIVER_CAP_SIZE];
+
+ struct nvif_outp_dp_rate rate[8];
+ int rate_nr;
+
int link_nr;
int link_bw;
@@ -83,7 +94,6 @@ struct nouveau_encoder {
*/
struct mutex hpd_irq_lock;
- u8 dpcd[DP_RECEIVER_CAP_SIZE];
u8 downstream_ports[DP_MAX_DOWNSTREAM_PORTS];
struct drm_dp_desc desc;
diff --git a/drivers/gpu/drm/nouveau/nvif/outp.c b/drivers/gpu/drm/nouveau/nvif/outp.c
index df6e89379982c..050d5cd303ad4 100644
--- a/drivers/gpu/drm/nouveau/nvif/outp.c
+++ b/drivers/gpu/drm/nouveau/nvif/outp.c
@@ -76,6 +76,27 @@ nvif_outp_acquire_dp(struct nvif_outp *outp, u8 dpcd[DP_RECEIVER_CAP_SIZE],
return ret;
}
+int
+nvif_outp_dp_rates(struct nvif_outp *outp, struct nvif_outp_dp_rate *rate, int rate_nr)
+{
+ struct nvif_outp_dp_rates_v0 args;
+ int ret;
+
+ if (rate_nr > ARRAY_SIZE(args.rate))
+ return -EINVAL;
+
+ args.version = 0;
+ args.rates = rate_nr;
+ for (int i = 0; i < args.rates; i++, rate++) {
+ args.rate[i].dpcd = rate->dpcd;
+ args.rate[i].rate = rate->rate;
+ }
+
+ ret = nvif_object_mthd(&outp->object, NVIF_OUTP_V0_DP_RATES, &args, sizeof(args));
+ NVIF_ERRON(ret, &outp->object, "[DP_RATES rates:%d]", args.rates);
+ return ret;
+}
+
int
nvif_outp_dp_aux_xfer(struct nvif_outp *outp, u8 type, u8 *psize, u32 addr, u8 *data)
{
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
index 49fbb32f50223..af0f81a2834b6 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
@@ -615,48 +615,6 @@ nvkm_dp_acquire(struct nvkm_outp *outp)
return ret;
}
-static bool
-nvkm_dp_enable_supported_link_rates(struct nvkm_outp *outp)
-{
- u8 sink_rates[DPCD_RC10_SUPPORTED_LINK_RATES__SIZE];
- int i, j, k;
-
- if (outp->conn->info.type != DCB_CONNECTOR_eDP ||
- outp->dp.dpcd[DPCD_RC00_DPCD_REV] < 0x13 ||
- nvkm_rdaux(outp->dp.aux, DPCD_RC10_SUPPORTED_LINK_RATES(0),
- sink_rates, sizeof(sink_rates)))
- return false;
-
- for (i = 0; i < ARRAY_SIZE(sink_rates); i += 2) {
- const u32 rate = ((sink_rates[i + 1] << 8) | sink_rates[i]) * 200 / 10;
-
- if (!rate || WARN_ON(outp->dp.rates == ARRAY_SIZE(outp->dp.rate)))
- break;
-
- if (rate > outp->info.dpconf.link_bw * 27000) {
- OUTP_DBG(outp, "rate %d !outp", rate);
- continue;
- }
-
- for (j = 0; j < outp->dp.rates; j++) {
- if (rate > outp->dp.rate[j].rate) {
- for (k = outp->dp.rates; k > j; k--)
- outp->dp.rate[k] = outp->dp.rate[k - 1];
- break;
- }
- }
-
- outp->dp.rate[j].dpcd = i / 2;
- outp->dp.rate[j].rate = rate;
- outp->dp.rates++;
- }
-
- for (i = 0; i < outp->dp.rates; i++)
- OUTP_DBG(outp, "link_rate[%d] = %d", outp->dp.rate[i].dpcd, outp->dp.rate[i].rate);
-
- return outp->dp.rates != 0;
-}
-
/* XXX: This is a big fat hack, and this is just drm_dp_read_dpcd_caps()
* converted to work inside nvkm. This is a temporary holdover until we start
* passing the drm_dp_aux device through NVKM
@@ -757,34 +715,10 @@ nvkm_dp_enable(struct nvkm_outp *outp, bool auxpwr)
}
if (!nvkm_dp_read_dpcd_caps(outp)) {
- const u8 rates[] = { 0x1e, 0x14, 0x0a, 0x06, 0 };
- const u8 *rate;
- int rate_max;
-
- outp->dp.rates = 0;
outp->dp.links = outp->dp.dpcd[DPCD_RC02] & DPCD_RC02_MAX_LANE_COUNT;
outp->dp.links = min(outp->dp.links, outp->info.dpconf.link_nr);
if (outp->dp.lttprs && outp->dp.lttpr[4])
outp->dp.links = min_t(int, outp->dp.links, outp->dp.lttpr[4]);
-
- rate_max = outp->dp.dpcd[DPCD_RC01_MAX_LINK_RATE];
- rate_max = min(rate_max, outp->info.dpconf.link_bw);
- if (outp->dp.lttprs && outp->dp.lttpr[1])
- rate_max = min_t(int, rate_max, outp->dp.lttpr[1]);
-
- if (!nvkm_dp_enable_supported_link_rates(outp)) {
- for (rate = rates; *rate; rate++) {
- if (*rate > rate_max)
- continue;
-
- if (WARN_ON(outp->dp.rates == ARRAY_SIZE(outp->dp.rate)))
- break;
-
- outp->dp.rate[outp->dp.rates].dpcd = -1;
- outp->dp.rate[outp->dp.rates].rate = *rate * 27000;
- outp->dp.rates++;
- }
- }
}
} else
if (!auxpwr && outp->dp.aux_pwr) {
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h
index a2391b224ea49..5cef5933e7f25 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h
@@ -108,6 +108,7 @@ struct nvkm_outp_func {
struct {
int (*aux_pwr)(struct nvkm_outp *, bool pu);
int (*aux_xfer)(struct nvkm_outp *, u8 type, u32 addr, u8 *data, u8 *size);
+ int (*rates)(struct nvkm_outp *);
} dp;
};
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
index cd92db9028a3d..fd756e4599dab 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
@@ -70,6 +70,29 @@ nvkm_uoutp_mthd_acquire_dp(struct nvkm_outp *outp, u8 dpcd[DP_RECEIVER_CAP_SIZE]
return 0;
}
+static int
+nvkm_uoutp_mthd_dp_rates(struct nvkm_outp *outp, void *argv, u32 argc)
+{
+ union nvif_outp_dp_rates_args *args = argv;
+
+ if (argc != sizeof(args->v0) || args->v0.version != 0)
+ return -ENOSYS;
+ if (args->v0.rates > ARRAY_SIZE(outp->dp.rate))
+ return -EINVAL;
+
+ for (int i = 0; i < args->v0.rates; i++) {
+ outp->dp.rate[i].dpcd = args->v0.rate[i].dpcd;
+ outp->dp.rate[i].rate = args->v0.rate[i].rate;
+ }
+
+ outp->dp.rates = args->v0.rates;
+
+ if (outp->func->dp.rates)
+ outp->func->dp.rates(outp);
+
+ return 0;
+}
+
static int
nvkm_uoutp_mthd_dp_aux_xfer(struct nvkm_outp *outp, void *argv, u32 argc)
{
@@ -457,6 +480,7 @@ nvkm_uoutp_mthd_noacquire(struct nvkm_outp *outp, u32 mthd, void *argv, u32 argc
case NVIF_OUTP_V0_BL_SET : return nvkm_uoutp_mthd_bl_set (outp, argv, argc);
case NVIF_OUTP_V0_DP_AUX_PWR : return nvkm_uoutp_mthd_dp_aux_pwr (outp, argv, argc);
case NVIF_OUTP_V0_DP_AUX_XFER: return nvkm_uoutp_mthd_dp_aux_xfer(outp, argv, argc);
+ case NVIF_OUTP_V0_DP_RATES : return nvkm_uoutp_mthd_dp_rates (outp, argv, argc);
default:
break;
}
--
2.41.0