2020-09-22 08:32:22

by Koba Ko

Subject: [PATCH V4] drm/dp_mst: Retrieve extended DPCD caps for topology manager

As per DP-1.3, First check DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT.
If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 1,read the DP_DP13_DPCD_REV to
get the faster capability.
If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 0,read DP_DPCD_REV.

Signed-off-by: Koba Ko <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index e87542533640..63f8809b9aa4 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3686,9 +3686,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms
WARN_ON(mgr->mst_primary);

/* get dpcd info */
- ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd, DP_RECEIVER_CAP_SIZE);
- if (ret != DP_RECEIVER_CAP_SIZE) {
- DRM_DEBUG_KMS("failed to read DPCD\n");
+ ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd);
+ if (ret < 0) {
+ drm_dbg_kms(mgr->dev, "failed to read DPCD, ret %d\n", ret);
goto out_unlock;
}

--
2.17.1

2020-09-22 18:03:36

by Lyude Paul

Subject: Re: [PATCH V4] drm/dp_mst: Retrieve extended DPCD caps for topology manager

One last change I realized we should do is print the name of the AUX adapter
in question. I don't mind just adding that myself before I push it though so
you don't need to send a respin.

Going to go push this to drm-misc-next, thanks!

On Tue, 2020-09-22 at 14:53 +0800, Koba Ko wrote:
> As per DP-1.3, First check DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT.
> If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 1,read the DP_DP13_DPCD_REV to
> get the faster capability.
> If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 0,read DP_DPCD_REV.
>
> Signed-off-by: Koba Ko <[email protected]>
> Reviewed-by: Lyude Paul <[email protected]>
> ---
> drivers/gpu/drm/drm_dp_mst_topology.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index e87542533640..63f8809b9aa4 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -3686,9 +3686,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct
> drm_dp_mst_topology_mgr *mgr, bool ms
> WARN_ON(mgr->mst_primary);
>
> /* get dpcd info */
> - ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd,
> DP_RECEIVER_CAP_SIZE);
> - if (ret != DP_RECEIVER_CAP_SIZE) {
> - DRM_DEBUG_KMS("failed to read DPCD\n");
> + ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd);
> + if (ret < 0) {
> + drm_dbg_kms(mgr->dev, "failed to read DPCD, ret %d\n",
> ret);
> goto out_unlock;
> }
>
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat

2020-09-23 02:59:55

by Koba Ko

Subject: Re: [PATCH V4] drm/dp_mst: Retrieve extended DPCD caps for topology manager

Thanks for the review.
Sorry for that I thought the review tag should be appended by myself.
One thing to confirm with you, will you or I push this patch to drm-misc-next ?

Thanks a lot.

On Wed, Sep 23, 2020 at 2:01 AM Lyude Paul <[email protected]> wrote:
>
> One last change I realized we should do is print the name of the AUX adapter
> in question. I don't mind just adding that myself before I push it though so
> you don't need to send a respin.
>
> Going to go push this to drm-misc-next, thanks!
>
> On Tue, 2020-09-22 at 14:53 +0800, Koba Ko wrote:
> > As per DP-1.3, First check DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT.
> > If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 1,read the DP_DP13_DPCD_REV to
> > get the faster capability.
> > If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 0,read DP_DPCD_REV.
> >
> > Signed-off-by: Koba Ko <[email protected]>
> > Reviewed-by: Lyude Paul <[email protected]>
> > ---
> > drivers/gpu/drm/drm_dp_mst_topology.c | 6 +++---
> > 1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> > b/drivers/gpu/drm/drm_dp_mst_topology.c
> > index e87542533640..63f8809b9aa4 100644
> > --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> > @@ -3686,9 +3686,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct
> > drm_dp_mst_topology_mgr *mgr, bool ms
> > WARN_ON(mgr->mst_primary);
> >
> > /* get dpcd info */
> > - ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd,
> > DP_RECEIVER_CAP_SIZE);
> > - if (ret != DP_RECEIVER_CAP_SIZE) {
> > - DRM_DEBUG_KMS("failed to read DPCD\n");
> > + ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd);
> > + if (ret < 0) {
> > + drm_dbg_kms(mgr->dev, "failed to read DPCD, ret %d\n",
> > ret);
> > goto out_unlock;
> > }
> >
> --
> Cheers,
> Lyude Paul (she/her)
> Software Engineer at Red Hat
>

2020-09-23 14:21:10

by Lyude Paul

Subject: Re: [PATCH V4] drm/dp_mst: Retrieve extended DPCD caps for topology manager

On Wed, 2020-09-23 at 10:16 +0800, Koba Ko wrote:
> Thanks for the review.
> Sorry for that I thought the review tag should be appended by myself.
> One thing to confirm with you, will you or I push this patch to drm-misc-
> next ?

I already pushed it with the change, so everything is all set

> Thanks a lot.
>
> On Wed, Sep 23, 2020 at 2:01 AM Lyude Paul <[email protected]> wrote:
> > One last change I realized we should do is print the name of the AUX
> > adapter
> > in question. I don't mind just adding that myself before I push it though
> > so
> > you don't need to send a respin.
> >
> > Going to go push this to drm-misc-next, thanks!
> >
> > On Tue, 2020-09-22 at 14:53 +0800, Koba Ko wrote:
> > > As per DP-1.3, First check DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT.
> > > If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 1,read the DP_DP13_DPCD_REV
> > > to
> > > get the faster capability.
> > > If DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT is 0,read DP_DPCD_REV.
> > >
> > > Signed-off-by: Koba Ko <[email protected]>
> > > Reviewed-by: Lyude Paul <[email protected]>
> > > ---
> > > drivers/gpu/drm/drm_dp_mst_topology.c | 6 +++---
> > > 1 file changed, 3 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> > > b/drivers/gpu/drm/drm_dp_mst_topology.c
> > > index e87542533640..63f8809b9aa4 100644
> > > --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> > > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> > > @@ -3686,9 +3686,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct
> > > drm_dp_mst_topology_mgr *mgr, bool ms
> > > WARN_ON(mgr->mst_primary);
> > >
> > > /* get dpcd info */
> > > - ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, mgr->dpcd,
> > > DP_RECEIVER_CAP_SIZE);
> > > - if (ret != DP_RECEIVER_CAP_SIZE) {
> > > - DRM_DEBUG_KMS("failed to read DPCD\n");
> > > + ret = drm_dp_read_dpcd_caps(mgr->aux, mgr->dpcd);
> > > + if (ret < 0) {
> > > + drm_dbg_kms(mgr->dev, "failed to read DPCD, ret
> > > %d\n",
> > > ret);
> > > goto out_unlock;
> > > }
> > >
> > --
> > Cheers,
> > Lyude Paul (she/her)
> > Software Engineer at Red Hat
> >
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat