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drm/i915/dp: Extract drm_dp_read_sink_count_cap()

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Since other drivers are also going to need to be aware of the sink count
in order to do proper dongle detection, we might as well steal i915's
DP_SINK_COUNT helpers and move them into DRM helpers so that other
dirvers can use them as well.

Note that this also starts using intel_dp_has_sink_count() in
intel_dp_detect_dpcd(), which is a functional change.

v5:
* Change name from drm_dp_has_sink_count() to
  drm_dp_read_sink_count_cap()

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20200826182456.322681-16-lyude@redhat.com
This commit is contained in:
Lyude Paul 2020-08-26 14:24:51 -04:00
parent 409d38139b
commit 693c3ec597
3 changed files with 41 additions and 10 deletions
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22
drivers/gpu/drm/drm_dp_helper.c
View File

@ -726,6 +726,28 @@ void drm_dp_set_subconnector_property(struct drm_connector *connector,
}
EXPORT_SYMBOL(drm_dp_set_subconnector_property);
/**
* drm_dp_read_sink_count_cap() - Check whether a given connector has a valid sink
* count
* @connector: The DRM connector to check
* @dpcd: A cached copy of the connector's DPCD RX capabilities
* @desc: A cached copy of the connector's DP descriptor
*
* Returns: %True if the (e)DP connector has a valid sink count that should
* be probed, %false otherwise.
*/
bool drm_dp_read_sink_count_cap(struct drm_connector *connector,
const u8 dpcd[DP_RECEIVER_CAP_SIZE],
const struct drm_dp_desc *desc)
{
/* Some eDP panels don't set a valid value for the sink count */
return connector->connector_type != DRM_MODE_CONNECTOR_eDP &&
dpcd[DP_DPCD_REV] >= DP_DPCD_REV_11 &&
dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT &&
!drm_dp_has_quirk(desc, 0, DP_DPCD_QUIRK_NO_SINK_COUNT);
}
EXPORT_SYMBOL(drm_dp_read_sink_count_cap);
/*
* I2C-over-AUX implementation
*/

21
drivers/gpu/drm/i915/display/intel_dp.c
View File

@ -4634,6 +4634,16 @@ intel_edp_init_dpcd(struct intel_dp *intel_dp)
return true;
}
static bool
intel_dp_has_sink_count(struct intel_dp *intel_dp)
{
if (!intel_dp->attached_connector)
return false;
return drm_dp_read_sink_count_cap(&intel_dp->attached_connector->base,
intel_dp->dpcd,
&intel_dp->desc);
}
static bool
intel_dp_get_dpcd(struct intel_dp *intel_dp)
@ -4653,13 +4663,7 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
intel_dp_set_common_rates(intel_dp);
}
/*
* Some eDP panels do not set a valid value for sink count, that is why
* it don't care about read it here and in intel_edp_init_dpcd().
*/
if (!intel_dp_is_edp(intel_dp) &&
!drm_dp_has_quirk(&intel_dp->desc, 0,
DP_DPCD_QUIRK_NO_SINK_COUNT)) {
if (intel_dp_has_sink_count(intel_dp)) {
u8 count;
ssize_t r;
@ -5939,9 +5943,8 @@ intel_dp_detect_dpcd(struct intel_dp *intel_dp)
return connector_status_connected;
/* If we're HPD-aware, SINK_COUNT changes dynamically */
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
if (intel_dp_has_sink_count(intel_dp) &&
intel_dp->downstream_ports[0] & DP_DS_PORT_HPD) {
return intel_dp->sink_count ?
connector_status_connected : connector_status_disconnected;
}

8
include/drm/drm_dp_helper.h
View File

@ -1631,6 +1631,11 @@ void drm_dp_set_subconnector_property(struct drm_connector *connector,
const u8 *dpcd,
const u8 port_cap[4]);
struct drm_dp_desc;
bool drm_dp_read_sink_count_cap(struct drm_connector *connector,
const u8 dpcd[DP_RECEIVER_CAP_SIZE],
const struct drm_dp_desc *desc);
void drm_dp_remote_aux_init(struct drm_dp_aux *aux);
void drm_dp_aux_init(struct drm_dp_aux *aux);
int drm_dp_aux_register(struct drm_dp_aux *aux);
@ -1689,7 +1694,8 @@ enum drm_dp_quirk {
* @DP_DPCD_QUIRK_NO_SINK_COUNT:
*
* The device does not set SINK_COUNT to a non-zero value.
* The driver should ignore SINK_COUNT during detection.
* The driver should ignore SINK_COUNT during detection. Note that
* drm_dp_read_sink_count_cap() automatically checks for this quirk.
*/
DP_DPCD_QUIRK_NO_SINK_COUNT,
/**