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drm/nouveau: Fix drm-core using atomic code-paths on pre-nv50 hardware

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We do not support atomic modesetting on pre-nv50 hardware, but until now
our connector code was setting drm_connector->state on pre-nv50 hardware.

This causes the core to enter atomic modesetting paths in at least:

1. drm_connector_get_encoder(), returning connector->state->best_encoder
which is always 0, causing us to always report 0 as encoder_id in
the drmModeConnector struct returned by drmModeGetConnector().

2. drm_encoder_get_crtc(), returning NULL because uses_atomic get set,
causing us to always report 0 as crtc_id in the drmModeEncoder struct
returned by drmModeGetEncoder()

Which in turn confuses userspace, at least plymouth thinks that the pipe
has changed because of this and tries to reconfigure it unnecessarily.

More in general we should not set drm_connector->state in the non-atomic
code as this violates the drm-core's expectations.

This commit fixes this by using a nouveau_conn_atom struct embedded in the
nouveau_connector struct for property handling in the non-atomic case.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1706557
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Hans de Goede 2019-10-24 10:52:53 +02:00 committed by Ben Skeggs
parent 37a68eab4c
commit 64d17f25dc
2 changed files with 27 additions and 7 deletions
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28
drivers/gpu/drm/nouveau/nouveau_connector.c
View File

@ -245,14 +245,22 @@ nouveau_conn_atomic_duplicate_state(struct drm_connector *connector)
void
nouveau_conn_reset(struct drm_connector *connector)
{
struct nouveau_connector *nv_connector = nouveau_connector(connector);
struct nouveau_conn_atom *asyc;
if (WARN_ON(!(asyc = kzalloc(sizeof(*asyc), GFP_KERNEL))))
return;
if (drm_drv_uses_atomic_modeset(connector->dev)) {
if (WARN_ON(!(asyc = kzalloc(sizeof(*asyc), GFP_KERNEL))))
return;
if (connector->state)
nouveau_conn_atomic_destroy_state(connector,
connector->state);
__drm_atomic_helper_connector_reset(connector, &asyc->state);
} else {
asyc = &nv_connector->properties_state;
}
if (connector->state)
nouveau_conn_atomic_destroy_state(connector, connector->state);
__drm_atomic_helper_connector_reset(connector, &asyc->state);
asyc->dither.mode = DITHERING_MODE_AUTO;
asyc->dither.depth = DITHERING_DEPTH_AUTO;
asyc->scaler.mode = DRM_MODE_SCALE_NONE;
@ -276,8 +284,14 @@ void
nouveau_conn_attach_properties(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
struct nouveau_conn_atom *armc = nouveau_conn_atom(connector->state);
struct nouveau_display *disp = nouveau_display(dev);
struct nouveau_connector *nv_connector = nouveau_connector(connector);
struct nouveau_conn_atom *armc;
if (drm_drv_uses_atomic_modeset(connector->dev))
armc = nouveau_conn_atom(connector->state);
else
armc = &nv_connector->properties_state;
/* Init DVI-I specific properties. */
if (connector->connector_type == DRM_MODE_CONNECTOR_DVII)
@ -748,9 +762,9 @@ static int
nouveau_connector_set_property(struct drm_connector *connector,
struct drm_property *property, uint64_t value)
{
struct nouveau_conn_atom *asyc = nouveau_conn_atom(connector->state);
struct nouveau_connector *nv_connector = nouveau_connector(connector);
struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
struct nouveau_conn_atom *asyc = &nv_connector->properties_state;
struct drm_encoder *encoder = to_drm_encoder(nv_encoder);
int ret;

6
drivers/gpu/drm/nouveau/nouveau_connector.h
View File

@ -118,6 +118,12 @@ struct nouveau_connector {
#ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT
struct nouveau_backlight *backlight;
#endif
/*
* Our connector property code expects a nouveau_conn_atom struct
* even on pre-nv50 where we do not support atomic. This embedded
* version gets used in the non atomic modeset case.
*/
struct nouveau_conn_atom properties_state;
};
static inline struct nouveau_connector *nouveau_connector(