[Nouveau] [PATCH 34/44] drm/nouveau/disp: add support for post-LT adjust
Ben Skeggs
skeggsb at gmail.com
Mon Sep 18 00:04:36 UTC 2023
On Sat, 16 Sept 2023 at 08:47, Danilo Krummrich <dakr at redhat.com> wrote:
>
> On 9/14/23 10:46, Ben Skeggs wrote:
> > From: Ben Skeggs <bskeggs at redhat.com>
> >
> > - fixes regression from previous commit
>
> From "drm/nouveau/disp: move link training out of supervisor"?
>
> I'd probably prefer to either re-order or combine them rather than having a
> regression in the series.
I would prefer that too, but it's not really possible in this case
without implementing post-LT adjust in two different places during the
transition. The prior commit doesn't introduce a bug, it exposes a
pre-existing one.
I'm happy to squash the two commits though, and will unless there are
any objections before I get to it. I mostly wanted Lyude to be able
to review them independently.
Ben.
>
> >
> > Signed-off-by: Ben Skeggs <bskeggs at redhat.com>
> > ---
> > drivers/gpu/drm/nouveau/include/nvif/if0012.h | 11 +++
> > drivers/gpu/drm/nouveau/include/nvif/outp.h | 1 +
> > drivers/gpu/drm/nouveau/nouveau_dp.c | 72 ++++++++++++++++++-
> > drivers/gpu/drm/nouveau/nvif/outp.c | 16 +++++
> > drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c | 17 +++++
> > .../gpu/drm/nouveau/nvkm/engine/disp/outp.h | 1 +
> > .../gpu/drm/nouveau/nvkm/engine/disp/uoutp.c | 14 ++++
> > 7 files changed, 130 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/nouveau/include/nvif/if0012.h b/drivers/gpu/drm/nouveau/include/nvif/if0012.h
> > index 14972b942be7..00ce0a46c152 100644
> > --- a/drivers/gpu/drm/nouveau/include/nvif/if0012.h
> > +++ b/drivers/gpu/drm/nouveau/include/nvif/if0012.h
> > @@ -35,6 +35,7 @@ union nvif_outp_args {
> > #define NVIF_OUTP_V0_DP_AUX_XFER 0x71
> > #define NVIF_OUTP_V0_DP_RATES 0x72
> > #define NVIF_OUTP_V0_DP_TRAIN 0x73
> > +#define NVIF_OUTP_V0_DP_DRIVE 0x74
> > #define NVIF_OUTP_V0_DP_MST_VCPI 0x78
> >
> > union nvif_outp_detect_args {
> > @@ -211,6 +212,16 @@ union nvif_outp_dp_train_args {
> > } v0;
> > };
> >
> > +union nvif_outp_dp_drive_args {
> > + struct nvif_outp_dp_drive_v0 {
> > + __u8 version;
> > + __u8 pad01[2];
> > + __u8 lanes;
> > + __u8 pe[4];
> > + __u8 vs[4];
> > + } v0;
> > +};
> > +
> > union nvif_outp_dp_mst_vcpi_args {
> > struct nvif_outp_dp_mst_vcpi_v0 {
> > __u8 version;
> > diff --git a/drivers/gpu/drm/nouveau/include/nvif/outp.h b/drivers/gpu/drm/nouveau/include/nvif/outp.h
> > index 9a78483e0289..b4f97fabecbd 100644
> > --- a/drivers/gpu/drm/nouveau/include/nvif/outp.h
> > +++ b/drivers/gpu/drm/nouveau/include/nvif/outp.h
> > @@ -67,6 +67,7 @@ int nvif_outp_dp_rates(struct nvif_outp *, struct nvif_outp_dp_rate *rate, int r
> > int nvif_outp_dp_train(struct nvif_outp *, u8 dpcd[DP_RECEIVER_CAP_SIZE],
> > u8 lttprs, u8 link_nr, u32 link_bw, bool mst, bool post_lt_adj,
> > bool retrain);
> > +int nvif_outp_dp_drive(struct nvif_outp *, u8 link_nr, u8 pe[4], u8 vs[4]);
> > int nvif_outp_dp_mst_vcpi(struct nvif_outp *, int head,
> > u8 start_slot, u8 num_slots, u16 pbn, u16 aligned_pbn);
> > #endif
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
> > index cd03c29c1063..7de7707ec6a8 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_dp.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
> > @@ -320,15 +320,83 @@ nouveau_dp_power_down(struct nouveau_encoder *outp)
> > static bool
> > nouveau_dp_train_link(struct nouveau_encoder *outp, bool retrain)
> > {
> > - int ret;
> > + struct drm_dp_aux *aux = &outp->conn->aux;
> > + bool post_lt = false;
> > + int ret, retries = 0;
> >
> > + if ( (outp->dp.dpcd[DP_MAX_LANE_COUNT] & 0x20) &&
> > + !(outp->dp.dpcd[DP_MAX_DOWNSPREAD] & DP_TPS4_SUPPORTED))
> > + post_lt = true;
> > +
> > +retry:
> > ret = nvif_outp_dp_train(&outp->outp, outp->dp.dpcd,
> > outp->dp.lttpr.nr,
> > outp->dp.lt.nr,
> > outp->dp.lt.bw,
> > outp->dp.lt.mst,
> > - false,
> > + post_lt,
> > retrain);
> > + if (ret)
> > + return false;
> > +
> > + if (post_lt) {
> > + u8 stat[DP_LINK_STATUS_SIZE];
> > + u8 prev[2];
> > + u8 time = 0, adjusts = 0, tmp;
> > +
> > + ret = drm_dp_dpcd_read_phy_link_status(aux, DP_PHY_DPRX, stat);
> > + if (ret)
> > + return false;
> > +
> > + for (;;) {
> > + if (!drm_dp_channel_eq_ok(stat, outp->dp.lt.nr)) {
> > + ret = 1;
> > + break;
> > + }
> > +
> > + if (!(stat[2] & 0x02))
> > + break;
> > +
> > + msleep(5);
> > + time += 5;
> > +
> > + memcpy(prev, &stat[4], sizeof(prev));
> > + ret = drm_dp_dpcd_read_phy_link_status(aux, DP_PHY_DPRX, stat);
> > + if (ret)
> > + break;
> > +
> > + if (!memcmp(prev, &stat[4], sizeof(prev))) {
> > + if (time > 200)
> > + break;
> > + } else {
> > + u8 pe[4], vs[4];
> > +
> > + if (adjusts++ == 6)
> > + break;
> > +
> > + for (int i = 0; i < outp->dp.lt.nr; i++) {
> > + pe[i] = drm_dp_get_adjust_request_pre_emphasis(stat, i) >>
> > + DP_TRAIN_PRE_EMPHASIS_SHIFT;
> > + vs[i] = drm_dp_get_adjust_request_voltage(stat, i) >>
> > + DP_TRAIN_VOLTAGE_SWING_SHIFT;
> > + }
> > +
> > + ret = nvif_outp_dp_drive(&outp->outp, outp->dp.lt.nr, pe, vs);
> > + if (ret)
> > + break;
> > +
> > + time = 0;
> > + }
> > + }
> > +
> > + if (drm_dp_dpcd_readb(aux, DP_LANE_COUNT_SET, &tmp) == 1) {
> > + tmp &= ~0x20;
> > + drm_dp_dpcd_writeb(aux, DP_LANE_COUNT_SET, tmp);
> > + }
> > + }
> > +
> > + if (ret == 1 && retries++ < 3)
> > + goto retry;
> >
> > return ret == 0;
> > }
> > diff --git a/drivers/gpu/drm/nouveau/nvif/outp.c b/drivers/gpu/drm/nouveau/nvif/outp.c
> > index 7ffd57d82f89..5fe5523587e6 100644
> > --- a/drivers/gpu/drm/nouveau/nvif/outp.c
> > +++ b/drivers/gpu/drm/nouveau/nvif/outp.c
> > @@ -46,6 +46,22 @@ nvif_outp_dp_mst_vcpi(struct nvif_outp *outp, int head,
> > return ret;
> > }
> >
> > +int
> > +nvif_outp_dp_drive(struct nvif_outp *outp, u8 link_nr, u8 pe[4], u8 vs[4])
> > +{
> > + struct nvif_outp_dp_drive_v0 args;
> > + int ret;
> > +
> > + args.version = 0;
> > + args.lanes = link_nr;
> > + memcpy(args.pe, pe, sizeof(args.pe));
> > + memcpy(args.vs, vs, sizeof(args.vs));
> > +
> > + ret = nvif_object_mthd(&outp->object, NVIF_OUTP_V0_DP_DRIVE, &args, sizeof(args));
> > + NVIF_ERRON(ret, &outp->object, "[DP_DRIVE lanes:%d]", args.lanes);
> > + return ret;
> > +}
> > +
> > int
> > nvif_outp_dp_train(struct nvif_outp *outp, u8 dpcd[DP_RECEIVER_CAP_SIZE], u8 lttprs,
> > u8 link_nr, u32 link_bw, bool mst, bool post_lt_adj, bool retrain)
> > diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
> > index 6f08ff8b1fba..77a91d42b977 100644
> > --- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
> > +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
> > @@ -315,6 +315,8 @@ nvkm_dp_train_link(struct nvkm_outp *outp, int rate)
> > sink[1] = ior->dp.nr;
> > if (ior->dp.ef)
> > sink[1] |= DPCD_LC01_ENHANCED_FRAME_EN;
> > + if (outp->dp.lt.post_adj)
> > + sink[1] |= 0x20;
> >
> > ret = nvkm_wraux(outp->dp.aux, DPCD_LC00_LINK_BW_SET, sink, 2);
> > if (ret)
> > @@ -454,6 +456,20 @@ nvkm_dp_train_init(struct nvkm_outp *outp)
> > }
> > }
> >
> > +static int
> > +nvkm_dp_drive(struct nvkm_outp *outp, u8 lanes, u8 pe[4], u8 vs[4])
> > +{
> > + struct lt_state lt = {
> > + .outp = outp,
> > + .stat[4] = (pe[0] << 2) | (vs[0] << 0) |
> > + (pe[1] << 6) | (vs[1] << 4),
> > + .stat[5] = (pe[2] << 2) | (vs[2] << 0) |
> > + (pe[3] << 6) | (vs[3] << 4),
> > + };
> > +
> > + return nvkm_dp_train_drive(<, false);
> > +}
> > +
> > static int
> > nvkm_dp_train(struct nvkm_outp *outp, bool retrain)
> > {
> > @@ -597,6 +613,7 @@ nvkm_dp_func = {
> > .dp.aux_pwr = nvkm_dp_aux_pwr,
> > .dp.aux_xfer = nvkm_dp_aux_xfer,
> > .dp.train = nvkm_dp_train,
> > + .dp.drive = nvkm_dp_drive,
> > };
> >
> > int
> > diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.h
> > index 014b95b0f561..cda17941de89 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 {
> > int (*aux_xfer)(struct nvkm_outp *, u8 type, u32 addr, u8 *data, u8 *size);
> > int (*rates)(struct nvkm_outp *);
> > int (*train)(struct nvkm_outp *, bool retrain);
> > + int (*drive)(struct nvkm_outp *, u8 lanes, u8 pe[4], u8 vs[4]);
> > } dp;
> > };
> >
> > diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
> > index a256b35ce79c..b634e76c2a9b 100644
> > --- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
> > +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
> > @@ -45,6 +45,19 @@ nvkm_uoutp_mthd_dp_mst_vcpi(struct nvkm_outp *outp, void *argv, u32 argc)
> > return 0;
> > }
> >
> > +static int
> > +nvkm_uoutp_mthd_dp_drive(struct nvkm_outp *outp, void *argv, u32 argc)
> > +{
> > + union nvif_outp_dp_drive_args *args = argv;
> > +
> > + if (argc != sizeof(args->v0) || args->v0.version != 0)
> > + return -ENOSYS;
> > + if (!outp->func->dp.drive)
> > + return -EINVAL;
> > +
> > + return outp->func->dp.drive(outp, args->v0.lanes, args->v0.pe, args->v0.vs);
> > +}
> > +
> > static int
> > nvkm_uoutp_mthd_dp_train(struct nvkm_outp *outp, void *argv, u32 argc)
> > {
> > @@ -447,6 +460,7 @@ nvkm_uoutp_mthd_acquired(struct nvkm_outp *outp, u32 mthd, void *argv, u32 argc)
> > case NVIF_OUTP_V0_INFOFRAME : return nvkm_uoutp_mthd_infoframe (outp, argv, argc);
> > case NVIF_OUTP_V0_HDA_ELD : return nvkm_uoutp_mthd_hda_eld (outp, argv, argc);
> > case NVIF_OUTP_V0_DP_TRAIN : return nvkm_uoutp_mthd_dp_train (outp, argv, argc);
> > + case NVIF_OUTP_V0_DP_DRIVE : return nvkm_uoutp_mthd_dp_drive (outp, argv, argc);
> > case NVIF_OUTP_V0_DP_MST_VCPI : return nvkm_uoutp_mthd_dp_mst_vcpi (outp, argv, argc);
> > default:
> > break;
>
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