Lyude Paul
2021-Feb-19 21:53 UTC
[Nouveau] [PATCH 15/30] drm/dp: Add backpointer to drm_device in drm_dp_aux
This is something that we've wanted for a while now: the ability to
actually look up the respective drm_device for a given drm_dp_aux struct.
This will also allow us to transition over to using the drm_dbg_*() helpers
for debug message printing, as we'll finally have a drm_device to reference
for doing so.
Note that there is one limitation with this - because some DP AUX adapters
exist as platform devices which are initialized independently of their
respective DRM devices, one cannot rely on drm_dp_aux->drm_dev to always be
non-NULL until drm_dp_aux_register() has been called. We make sure to point
this out in the documentation for struct drm_dp_aux.
Signed-off-by: Lyude Paul <lyude at redhat.com>
---
drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 1 +
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 1 +
drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 1 +
drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c | 1 +
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 1 +
drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 1 +
drivers/gpu/drm/bridge/tc358767.c | 1 +
drivers/gpu/drm/bridge/ti-sn65dsi86.c | 1 +
drivers/gpu/drm/drm_dp_aux_dev.c | 6 ++++++
drivers/gpu/drm/drm_dp_mst_topology.c | 1 +
drivers/gpu/drm/i915/display/intel_dp_aux.c | 1 +
drivers/gpu/drm/msm/edp/edp.h | 3 +--
drivers/gpu/drm/msm/edp/edp_aux.c | 5 +++--
drivers/gpu/drm/msm/edp/edp_ctrl.c | 2 +-
drivers/gpu/drm/nouveau/nouveau_connector.c | 1 +
drivers/gpu/drm/radeon/atombios_dp.c | 1 +
drivers/gpu/drm/tegra/dpaux.c | 1 +
drivers/gpu/drm/xlnx/zynqmp_dp.c | 1 +
include/drm/drm_dp_helper.h | 9 ++++++++-
19 files changed, 33 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
index a3ba9ca11e98..6d35da65e09f 100644
--- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
@@ -188,6 +188,7 @@ void amdgpu_atombios_dp_aux_init(struct amdgpu_connector
*amdgpu_connector)
{
amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd;
amdgpu_connector->ddc_bus->aux.transfer =
amdgpu_atombios_dp_aux_transfer;
+ amdgpu_connector->ddc_bus->aux.drm_dev = amdgpu_connector->base.dev;
drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux);
amdgpu_connector->ddc_bus->has_aux = true;
}
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 41b09ab22233..163641b44339 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -431,6 +431,7 @@ void amdgpu_dm_initialize_dp_connector(struct
amdgpu_display_manager *dm,
link_index);
aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer;
aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;
+ aconnector->dm_dp_aux.aux.drm_dev = dm->ddev;
drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
index aa6cda458eb9..e33cd077595a 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
@@ -537,6 +537,7 @@ static int anx6345_bridge_attach(struct drm_bridge *bridge,
/* Register aux channel */
anx6345->aux.name = "DP-AUX";
anx6345->aux.dev = &anx6345->client->dev;
+ anx6345->aux.drm_dev = bridge->dev;
anx6345->aux.transfer = anx6345_aux_transfer;
err = drm_dp_aux_register(&anx6345->aux);
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
index f20558618220..5e6a0ed39199 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
@@ -905,6 +905,7 @@ static int anx78xx_bridge_attach(struct drm_bridge *bridge,
/* Register aux channel */
anx78xx->aux.name = "DP-AUX";
anx78xx->aux.dev = &anx78xx->client->dev;
+ anx78xx->aux.drm_dev = bridge->dev;
anx78xx->aux.transfer = anx78xx_aux_transfer;
err = drm_dp_aux_register(&anx78xx->aux);
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index f115233b1cb9..550814ca2139 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -1765,6 +1765,7 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct
drm_device *drm_dev)
dp->aux.name = "DP-AUX";
dp->aux.transfer = analogix_dpaux_transfer;
dp->aux.dev = dp->dev;
+ dp->aux.drm_dev = drm_dev;
ret = drm_dp_aux_register(&dp->aux);
if (ret)
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index d966a33743b5..fe821ad628ec 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -1674,6 +1674,7 @@ static int cdns_mhdp_attach(struct drm_bridge *bridge,
dev_dbg(mhdp->dev, "%s\n", __func__);
+ mhdp->aux.drm_dev = bridge->dev;
ret = drm_dp_aux_register(&mhdp->aux);
if (ret < 0)
return ret;
diff --git a/drivers/gpu/drm/bridge/tc358767.c
b/drivers/gpu/drm/bridge/tc358767.c
index da89922721ed..23a6f90b694b 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1414,6 +1414,7 @@ static int tc_bridge_attach(struct drm_bridge *bridge,
if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
return 0;
+ tc->aux.drm_dev = drm;
ret = drm_dp_aux_register(&tc->aux);
if (ret < 0)
return ret;
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 88df4dd0f39d..8e24272bbf00 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -362,6 +362,7 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
return -EINVAL;
}
+ pdata->aux.drm_dev = bridge->dev;
ret = drm_dp_aux_register(&pdata->aux);
if (ret < 0) {
drm_err(bridge->dev, "Failed to register DP AUX channel: %d\n",
ret);
diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c b/drivers/gpu/drm/drm_dp_aux_dev.c
index e25181bf2c48..06b374cae956 100644
--- a/drivers/gpu/drm/drm_dp_aux_dev.c
+++ b/drivers/gpu/drm/drm_dp_aux_dev.c
@@ -278,6 +278,12 @@ void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux)
if (!aux_dev) /* attach must have failed */
return;
+ /*
+ * As some AUX adapters may exist as platform devices which outlive their
respective DRM
+ * devices, we clear drm_dev to ensure that we never accidentally reference a
stale pointer
+ */
+ aux->drm_dev = NULL;
+
mutex_lock(&aux_idr_mutex);
idr_remove(&aux_idr, aux_dev->index);
mutex_unlock(&aux_idr_mutex);
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
b/drivers/gpu/drm/drm_dp_mst_topology.c
index 932c4641ec3e..cf4f2f85711e 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -2349,6 +2349,7 @@ drm_dp_mst_add_port(struct drm_device *dev,
port->aux.is_remote = true;
/* initialize the MST downstream port's AUX crc work queue */
+ port->aux.drm_dev = dev;
drm_dp_remote_aux_init(&port->aux);
/*
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c
b/drivers/gpu/drm/i915/display/intel_dp_aux.c
index eaebf123310a..0571c0794226 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -675,6 +675,7 @@ void intel_dp_aux_init(struct intel_dp *intel_dp)
else
intel_dp->get_aux_send_ctl = g4x_get_aux_send_ctl;
+ intel_dp->aux.drm_dev = &dev_priv->drm;
drm_dp_aux_init(&intel_dp->aux);
/* Failure to allocate our preferred name is not critical */
diff --git a/drivers/gpu/drm/msm/edp/edp.h b/drivers/gpu/drm/msm/edp/edp.h
index eb34243dad53..8590f2ce274d 100644
--- a/drivers/gpu/drm/msm/edp/edp.h
+++ b/drivers/gpu/drm/msm/edp/edp.h
@@ -46,8 +46,7 @@ void edp_bridge_destroy(struct drm_bridge *bridge);
struct drm_connector *msm_edp_connector_init(struct msm_edp *edp);
/* AUX */
-void *msm_edp_aux_init(struct device *dev, void __iomem *regbase,
- struct drm_dp_aux **drm_aux);
+void *msm_edp_aux_init(struct msm_edp *edp, void __iomem *regbase, struct
drm_dp_aux **drm_aux);
void msm_edp_aux_destroy(struct device *dev, struct edp_aux *aux);
irqreturn_t msm_edp_aux_irq(struct edp_aux *aux, u32 isr);
void msm_edp_aux_ctrl(struct edp_aux *aux, int enable);
diff --git a/drivers/gpu/drm/msm/edp/edp_aux.c
b/drivers/gpu/drm/msm/edp/edp_aux.c
index df10a0196d94..e3d85c622cfb 100644
--- a/drivers/gpu/drm/msm/edp/edp_aux.c
+++ b/drivers/gpu/drm/msm/edp/edp_aux.c
@@ -184,9 +184,9 @@ static ssize_t edp_aux_transfer(struct drm_dp_aux *drm_aux,
return ret;
}
-void *msm_edp_aux_init(struct device *dev, void __iomem *regbase,
- struct drm_dp_aux **drm_aux)
+void *msm_edp_aux_init(struct msm_edp *edp, void __iomem *regbase, struct
drm_dp_aux **drm_aux)
{
+ struct device *dev = &edp->pdev->dev;
struct edp_aux *aux = NULL;
int ret;
@@ -201,6 +201,7 @@ void *msm_edp_aux_init(struct device *dev, void __iomem
*regbase,
aux->drm_aux.name = "msm_edp_aux";
aux->drm_aux.dev = dev;
+ aux->drm_aux.drm_dev = edp->dev;
aux->drm_aux.transfer = edp_aux_transfer;
ret = drm_dp_aux_register(&aux->drm_aux);
if (ret) {
diff --git a/drivers/gpu/drm/msm/edp/edp_ctrl.c
b/drivers/gpu/drm/msm/edp/edp_ctrl.c
index 0d9657cc70db..57af3d8b6699 100644
--- a/drivers/gpu/drm/msm/edp/edp_ctrl.c
+++ b/drivers/gpu/drm/msm/edp/edp_ctrl.c
@@ -1153,7 +1153,7 @@ int msm_edp_ctrl_init(struct msm_edp *edp)
}
/* Init aux and phy */
- ctrl->aux = msm_edp_aux_init(dev, ctrl->base, &ctrl->drm_aux);
+ ctrl->aux = msm_edp_aux_init(edp, ctrl->base, &ctrl->drm_aux);
if (!ctrl->aux || !ctrl->drm_aux) {
pr_err("%s:failed to init aux\n", __func__);
return -ENOMEM;
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c
b/drivers/gpu/drm/nouveau/nouveau_connector.c
index bfce762adcf0..d1b49508ecb9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -1355,6 +1355,7 @@ nouveau_connector_create(struct drm_device *dev,
case DRM_MODE_CONNECTOR_DisplayPort:
case DRM_MODE_CONNECTOR_eDP:
nv_connector->aux.dev = connector->kdev;
+ nv_connector->aux.drm_dev = dev;
nv_connector->aux.transfer = nouveau_connector_aux_xfer;
snprintf(aux_name, sizeof(aux_name), "sor-%04x-%04x",
dcbe->hasht, dcbe->hashm);
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
b/drivers/gpu/drm/radeon/atombios_dp.c
index 15b00a347560..c50c504bad50 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -232,6 +232,7 @@ void radeon_dp_aux_init(struct radeon_connector
*radeon_connector)
radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd;
radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev;
+ radeon_connector->ddc_bus->aux.drm_dev = radeon_connector->base.dev;
if (ASIC_IS_DCE5(rdev)) {
if (radeon_auxch)
radeon_connector->ddc_bus->aux.transfer =
radeon_dp_aux_transfer_native;
diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index ea56c6ec25e4..7d7cc90b6fc9 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -719,6 +719,7 @@ int drm_dp_aux_attach(struct drm_dp_aux *aux, struct
tegra_output *output)
unsigned long timeout;
int err;
+ aux->drm_dev = output->connector.dev;
err = drm_dp_aux_register(aux);
if (err < 0)
return err;
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 99158ee67d02..8272eee03adc 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -1069,6 +1069,7 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
dp->aux.name = "ZynqMP DP AUX";
dp->aux.dev = dp->dev;
+ dp->aux.drm_dev = dp->drm;
dp->aux.transfer = zynqmp_dp_aux_transfer;
return drm_dp_aux_register(&dp->aux);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index b35a1c1339e8..45ec74862212 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1833,13 +1833,19 @@ struct drm_dp_aux_cec {
* @name: user-visible name of this AUX channel and the I2C-over-AUX adapter
* @ddc: I2C adapter that can be used for I2C-over-AUX communication
* @dev: pointer to struct device that is the parent for this AUX channel
+ * @drm_dev: pointer to the &drm_device that owns this AUX channel. Beware,
this may be %NULL
+ * before drm_dp_aux_register() has been called.
* @crtc: backpointer to the crtc that is currently using this AUX channel
* @hw_mutex: internal mutex used for locking transfers
* @crc_work: worker that captures CRCs for each frame
* @crc_count: counter of captured frame CRCs
* @transfer: transfers a message representing a single AUX transaction
*
- * The @dev field should be set to a pointer to the device that implements the
AUX channel.
+ * The @dev field should be set to a pointer to the device that implements the
AUX channel. As well,
+ * the @drm_dev field should be set to the &drm_device that will be using
this AUX channel as early
+ * as possible. For many graphics drivers this should happen before
drm_dp_aux_init(), however it's
+ * perfectly fine to set this field later so long as it's assigned before
calling
+ * drm_dp_aux_register().
*
* The @name field may be used to specify the name of the I2C adapter. If set
to %NULL, dev_name()
* of @dev will be used.
@@ -1866,6 +1872,7 @@ struct drm_dp_aux {
const char *name;
struct i2c_adapter ddc;
struct device *dev;
+ struct drm_device *drm_dev;
struct drm_crtc *crtc;
struct mutex hw_mutex;
struct work_struct crc_work;
--
2.29.2
Laurent Pinchart
2021-Feb-21 18:21 UTC
[Nouveau] [PATCH 15/30] drm/dp: Add backpointer to drm_device in drm_dp_aux
Hi Lyude, Thank you for the patch. On Fri, Feb 19, 2021 at 04:53:11PM -0500, Lyude Paul wrote:> This is something that we've wanted for a while now: the ability to > actually look up the respective drm_device for a given drm_dp_aux struct. > This will also allow us to transition over to using the drm_dbg_*() helpers > for debug message printing, as we'll finally have a drm_device to reference > for doing so.Isn't it better to use the existing dev field ? If you have multiple DP outputs for one DRM device, using the DRM device name in debug messages won't tell which output the message corresponds to.> Note that there is one limitation with this - because some DP AUX adapters > exist as platform devices which are initialized independently of their > respective DRM devices, one cannot rely on drm_dp_aux->drm_dev to always be > non-NULL until drm_dp_aux_register() has been called. We make sure to point > this out in the documentation for struct drm_dp_aux. > > Signed-off-by: Lyude Paul <lyude at redhat.com> > --- > drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 1 + > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 1 + > drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 1 + > drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c | 1 + > drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 1 + > drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 1 + > drivers/gpu/drm/bridge/tc358767.c | 1 + > drivers/gpu/drm/bridge/ti-sn65dsi86.c | 1 + > drivers/gpu/drm/drm_dp_aux_dev.c | 6 ++++++ > drivers/gpu/drm/drm_dp_mst_topology.c | 1 + > drivers/gpu/drm/i915/display/intel_dp_aux.c | 1 + > drivers/gpu/drm/msm/edp/edp.h | 3 +-- > drivers/gpu/drm/msm/edp/edp_aux.c | 5 +++-- > drivers/gpu/drm/msm/edp/edp_ctrl.c | 2 +- > drivers/gpu/drm/nouveau/nouveau_connector.c | 1 + > drivers/gpu/drm/radeon/atombios_dp.c | 1 + > drivers/gpu/drm/tegra/dpaux.c | 1 + > drivers/gpu/drm/xlnx/zynqmp_dp.c | 1 + > include/drm/drm_dp_helper.h | 9 ++++++++- > 19 files changed, 33 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c > index a3ba9ca11e98..6d35da65e09f 100644 > --- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c > +++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c > @@ -188,6 +188,7 @@ void amdgpu_atombios_dp_aux_init(struct amdgpu_connector *amdgpu_connector) > { > amdgpu_connector->ddc_bus->rec.hpd = amdgpu_connector->hpd.hpd; > amdgpu_connector->ddc_bus->aux.transfer = amdgpu_atombios_dp_aux_transfer; > + amdgpu_connector->ddc_bus->aux.drm_dev = amdgpu_connector->base.dev; > drm_dp_aux_init(&amdgpu_connector->ddc_bus->aux); > amdgpu_connector->ddc_bus->has_aux = true; > } > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c > index 41b09ab22233..163641b44339 100644 > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c > @@ -431,6 +431,7 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm, > link_index); > aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer; > aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc; > + aconnector->dm_dp_aux.aux.drm_dev = dm->ddev; > > drm_dp_aux_init(&aconnector->dm_dp_aux.aux); > drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux, > diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c > index aa6cda458eb9..e33cd077595a 100644 > --- a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c > +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c > @@ -537,6 +537,7 @@ static int anx6345_bridge_attach(struct drm_bridge *bridge, > /* Register aux channel */ > anx6345->aux.name = "DP-AUX"; > anx6345->aux.dev = &anx6345->client->dev; > + anx6345->aux.drm_dev = bridge->dev; > anx6345->aux.transfer = anx6345_aux_transfer; > > err = drm_dp_aux_register(&anx6345->aux); > diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c > index f20558618220..5e6a0ed39199 100644 > --- a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c > +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c > @@ -905,6 +905,7 @@ static int anx78xx_bridge_attach(struct drm_bridge *bridge, > /* Register aux channel */ > anx78xx->aux.name = "DP-AUX"; > anx78xx->aux.dev = &anx78xx->client->dev; > + anx78xx->aux.drm_dev = bridge->dev; > anx78xx->aux.transfer = anx78xx_aux_transfer; > > err = drm_dp_aux_register(&anx78xx->aux); > diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c > index f115233b1cb9..550814ca2139 100644 > --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c > +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c > @@ -1765,6 +1765,7 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev) > dp->aux.name = "DP-AUX"; > dp->aux.transfer = analogix_dpaux_transfer; > dp->aux.dev = dp->dev; > + dp->aux.drm_dev = drm_dev; > > ret = drm_dp_aux_register(&dp->aux); > if (ret) > diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c > index d966a33743b5..fe821ad628ec 100644 > --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c > +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c > @@ -1674,6 +1674,7 @@ static int cdns_mhdp_attach(struct drm_bridge *bridge, > > dev_dbg(mhdp->dev, "%s\n", __func__); > > + mhdp->aux.drm_dev = bridge->dev; > ret = drm_dp_aux_register(&mhdp->aux); > if (ret < 0) > return ret; > diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c > index da89922721ed..23a6f90b694b 100644 > --- a/drivers/gpu/drm/bridge/tc358767.c > +++ b/drivers/gpu/drm/bridge/tc358767.c > @@ -1414,6 +1414,7 @@ static int tc_bridge_attach(struct drm_bridge *bridge, > if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) > return 0; > > + tc->aux.drm_dev = drm; > ret = drm_dp_aux_register(&tc->aux); > if (ret < 0) > return ret; > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > index 88df4dd0f39d..8e24272bbf00 100644 > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c > @@ -362,6 +362,7 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge, > return -EINVAL; > } > > + pdata->aux.drm_dev = bridge->dev; > ret = drm_dp_aux_register(&pdata->aux); > if (ret < 0) { > drm_err(bridge->dev, "Failed to register DP AUX channel: %d\n", ret); > diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c b/drivers/gpu/drm/drm_dp_aux_dev.c > index e25181bf2c48..06b374cae956 100644 > --- a/drivers/gpu/drm/drm_dp_aux_dev.c > +++ b/drivers/gpu/drm/drm_dp_aux_dev.c > @@ -278,6 +278,12 @@ void drm_dp_aux_unregister_devnode(struct drm_dp_aux *aux) > if (!aux_dev) /* attach must have failed */ > return; > > + /* > + * As some AUX adapters may exist as platform devices which outlive their respective DRM > + * devices, we clear drm_dev to ensure that we never accidentally reference a stale pointer > + */ > + aux->drm_dev = NULL; > + > mutex_lock(&aux_idr_mutex); > idr_remove(&aux_idr, aux_dev->index); > mutex_unlock(&aux_idr_mutex); > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index 932c4641ec3e..cf4f2f85711e 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -2349,6 +2349,7 @@ drm_dp_mst_add_port(struct drm_device *dev, > port->aux.is_remote = true; > > /* initialize the MST downstream port's AUX crc work queue */ > + port->aux.drm_dev = dev; > drm_dp_remote_aux_init(&port->aux); > > /* > diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c > index eaebf123310a..0571c0794226 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_aux.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c > @@ -675,6 +675,7 @@ void intel_dp_aux_init(struct intel_dp *intel_dp) > else > intel_dp->get_aux_send_ctl = g4x_get_aux_send_ctl; > > + intel_dp->aux.drm_dev = &dev_priv->drm; > drm_dp_aux_init(&intel_dp->aux); > > /* Failure to allocate our preferred name is not critical */ > diff --git a/drivers/gpu/drm/msm/edp/edp.h b/drivers/gpu/drm/msm/edp/edp.h > index eb34243dad53..8590f2ce274d 100644 > --- a/drivers/gpu/drm/msm/edp/edp.h > +++ b/drivers/gpu/drm/msm/edp/edp.h > @@ -46,8 +46,7 @@ void edp_bridge_destroy(struct drm_bridge *bridge); > struct drm_connector *msm_edp_connector_init(struct msm_edp *edp); > > /* AUX */ > -void *msm_edp_aux_init(struct device *dev, void __iomem *regbase, > - struct drm_dp_aux **drm_aux); > +void *msm_edp_aux_init(struct msm_edp *edp, void __iomem *regbase, struct drm_dp_aux **drm_aux); > void msm_edp_aux_destroy(struct device *dev, struct edp_aux *aux); > irqreturn_t msm_edp_aux_irq(struct edp_aux *aux, u32 isr); > void msm_edp_aux_ctrl(struct edp_aux *aux, int enable); > diff --git a/drivers/gpu/drm/msm/edp/edp_aux.c b/drivers/gpu/drm/msm/edp/edp_aux.c > index df10a0196d94..e3d85c622cfb 100644 > --- a/drivers/gpu/drm/msm/edp/edp_aux.c > +++ b/drivers/gpu/drm/msm/edp/edp_aux.c > @@ -184,9 +184,9 @@ static ssize_t edp_aux_transfer(struct drm_dp_aux *drm_aux, > return ret; > } > > -void *msm_edp_aux_init(struct device *dev, void __iomem *regbase, > - struct drm_dp_aux **drm_aux) > +void *msm_edp_aux_init(struct msm_edp *edp, void __iomem *regbase, struct drm_dp_aux **drm_aux) > { > + struct device *dev = &edp->pdev->dev; > struct edp_aux *aux = NULL; > int ret; > > @@ -201,6 +201,7 @@ void *msm_edp_aux_init(struct device *dev, void __iomem *regbase, > > aux->drm_aux.name = "msm_edp_aux"; > aux->drm_aux.dev = dev; > + aux->drm_aux.drm_dev = edp->dev; > aux->drm_aux.transfer = edp_aux_transfer; > ret = drm_dp_aux_register(&aux->drm_aux); > if (ret) { > diff --git a/drivers/gpu/drm/msm/edp/edp_ctrl.c b/drivers/gpu/drm/msm/edp/edp_ctrl.c > index 0d9657cc70db..57af3d8b6699 100644 > --- a/drivers/gpu/drm/msm/edp/edp_ctrl.c > +++ b/drivers/gpu/drm/msm/edp/edp_ctrl.c > @@ -1153,7 +1153,7 @@ int msm_edp_ctrl_init(struct msm_edp *edp) > } > > /* Init aux and phy */ > - ctrl->aux = msm_edp_aux_init(dev, ctrl->base, &ctrl->drm_aux); > + ctrl->aux = msm_edp_aux_init(edp, ctrl->base, &ctrl->drm_aux); > if (!ctrl->aux || !ctrl->drm_aux) { > pr_err("%s:failed to init aux\n", __func__); > return -ENOMEM; > diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c > index bfce762adcf0..d1b49508ecb9 100644 > --- a/drivers/gpu/drm/nouveau/nouveau_connector.c > +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c > @@ -1355,6 +1355,7 @@ nouveau_connector_create(struct drm_device *dev, > case DRM_MODE_CONNECTOR_DisplayPort: > case DRM_MODE_CONNECTOR_eDP: > nv_connector->aux.dev = connector->kdev; > + nv_connector->aux.drm_dev = dev; > nv_connector->aux.transfer = nouveau_connector_aux_xfer; > snprintf(aux_name, sizeof(aux_name), "sor-%04x-%04x", > dcbe->hasht, dcbe->hashm); > diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c > index 15b00a347560..c50c504bad50 100644 > --- a/drivers/gpu/drm/radeon/atombios_dp.c > +++ b/drivers/gpu/drm/radeon/atombios_dp.c > @@ -232,6 +232,7 @@ void radeon_dp_aux_init(struct radeon_connector *radeon_connector) > > radeon_connector->ddc_bus->rec.hpd = radeon_connector->hpd.hpd; > radeon_connector->ddc_bus->aux.dev = radeon_connector->base.kdev; > + radeon_connector->ddc_bus->aux.drm_dev = radeon_connector->base.dev; > if (ASIC_IS_DCE5(rdev)) { > if (radeon_auxch) > radeon_connector->ddc_bus->aux.transfer = radeon_dp_aux_transfer_native; > diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c > index ea56c6ec25e4..7d7cc90b6fc9 100644 > --- a/drivers/gpu/drm/tegra/dpaux.c > +++ b/drivers/gpu/drm/tegra/dpaux.c > @@ -719,6 +719,7 @@ int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output) > unsigned long timeout; > int err; > > + aux->drm_dev = output->connector.dev; > err = drm_dp_aux_register(aux); > if (err < 0) > return err; > diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c > index 99158ee67d02..8272eee03adc 100644 > --- a/drivers/gpu/drm/xlnx/zynqmp_dp.c > +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c > @@ -1069,6 +1069,7 @@ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp) > > dp->aux.name = "ZynqMP DP AUX"; > dp->aux.dev = dp->dev; > + dp->aux.drm_dev = dp->drm; > dp->aux.transfer = zynqmp_dp_aux_transfer; > > return drm_dp_aux_register(&dp->aux); > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h > index b35a1c1339e8..45ec74862212 100644 > --- a/include/drm/drm_dp_helper.h > +++ b/include/drm/drm_dp_helper.h > @@ -1833,13 +1833,19 @@ struct drm_dp_aux_cec { > * @name: user-visible name of this AUX channel and the I2C-over-AUX adapter > * @ddc: I2C adapter that can be used for I2C-over-AUX communication > * @dev: pointer to struct device that is the parent for this AUX channel > + * @drm_dev: pointer to the &drm_device that owns this AUX channel. Beware, this may be %NULL > + * before drm_dp_aux_register() has been called. > * @crtc: backpointer to the crtc that is currently using this AUX channel > * @hw_mutex: internal mutex used for locking transfers > * @crc_work: worker that captures CRCs for each frame > * @crc_count: counter of captured frame CRCs > * @transfer: transfers a message representing a single AUX transaction > * > - * The @dev field should be set to a pointer to the device that implements the AUX channel. > + * The @dev field should be set to a pointer to the device that implements the AUX channel. As well, > + * the @drm_dev field should be set to the &drm_device that will be using this AUX channel as early > + * as possible. For many graphics drivers this should happen before drm_dp_aux_init(), however it's > + * perfectly fine to set this field later so long as it's assigned before calling > + * drm_dp_aux_register(). > * > * The @name field may be used to specify the name of the I2C adapter. If set to %NULL, dev_name() > * of @dev will be used. > @@ -1866,6 +1872,7 @@ struct drm_dp_aux { > const char *name; > struct i2c_adapter ddc; > struct device *dev; > + struct drm_device *drm_dev; > struct drm_crtc *crtc; > struct mutex hw_mutex; > struct work_struct crc_work;-- Regards, Laurent Pinchart