diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 5a103e9b3c86d8ab04f6bf4280e1a95465d17f07..db23308f4d8b57e7a43c8ea26d4a4ba09c502acf 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1221,6 +1221,67 @@ drm_dp_get_quirks(const struct drm_dp_dpcd_ident *ident, bool is_branch)
#undef DEVICE_ID_ANY
#undef DEVICE_ID
+struct edid_quirk {
+ u8 mfg_id[2];
+ u8 prod_id[2];
+ u32 quirks;
+};
+
+#define MFG(first, second) { (first), (second) }
+#define PROD_ID(first, second) { (first), (second) }
+
+/*
+ * Some devices have unreliable OUIDs where they don't set the device ID
+ * correctly, and as a result we need to use the EDID for finding additional
+ * DP quirks in such cases.
+ */
+static const struct edid_quirk edid_quirk_list[] = {
+};
+
+#undef MFG
+#undef PROD_ID
+
+/**
+ * drm_dp_get_edid_quirks() - Check the EDID of a DP device to find additional
+ * DP-specific quirks
+ * @edid: The EDID to check
+ *
+ * While OUIDs are meant to be used to recognize a DisplayPort device, a lot
+ * of manufacturers don't seem to like following standards and neglect to fill
+ * the dev-ID in, making it impossible to only use OUIDs for determining
+ * quirks in some cases. This function can be used to check the EDID and look
+ * up any additional DP quirks. The bits returned by this function correspond
+ * to the quirk bits in &drm_dp_quirk.
+ *
+ * Returns: a bitmask of quirks, if any. The driver can check this using
+ * drm_dp_has_quirk().
+ */
+u32 drm_dp_get_edid_quirks(const struct edid *edid)
+{
+ const struct edid_quirk *quirk;
+ u32 quirks = 0;
+ int i;
+
+ if (!edid)
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(edid_quirk_list); i++) {
+ quirk = &edid_quirk_list[i];
+ if (memcmp(quirk->mfg_id, edid->mfg_id,
+ sizeof(edid->mfg_id)) == 0 &&
+ memcmp(quirk->prod_id, edid->prod_code,
+ sizeof(edid->prod_code)) == 0)
+ quirks |= quirk->quirks;
+ }
+
+ DRM_DEBUG_KMS("DP sink: EDID mfg %*phD prod-ID %*phD quirks: 0x%04x\n",
+ (int)sizeof(edid->mfg_id), edid->mfg_id,
+ (int)sizeof(edid->prod_code), edid->prod_code, quirks);
+
+ return quirks;
+}
+EXPORT_SYMBOL(drm_dp_get_edid_quirks);
+
/**
* drm_dp_read_desc - read sink/branch descriptor from DPCD
* @aux: DisplayPort AUX channel
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index a811247cecfefe7237bd421410ce73b24b8ee532..68247670427a16294ddc57e4b7234f81c630dd14 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -5452,7 +5452,8 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
if (drm_dp_read_desc(port->mgr->aux, &desc, true))
return NULL;
- if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) &&
+ if (drm_dp_has_quirk(&desc, 0,
+ DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) &&
port->mgr->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14 &&
port->parent == port->mgr->mst_primary) {
u8 downstreamport;
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index bd37c7058f93f6fb0d73430a4c7111bf7a9c36b8..5e00e611f077f80a29fe048551f7b732f6b78a7c 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1280,6 +1280,7 @@ struct intel_dp {
int max_link_rate;
/* sink or branch descriptor */
struct drm_dp_desc desc;
+ u32 edid_quirks;
struct drm_dp_aux aux;
u32 aux_busy_last_status;
u8 train_set[4];
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 7bf2b6878677ab56329164111dae885a75b638d8..0a417cd2af2bc02dd8f992b28b6b810c6f3e2232 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -2398,7 +2398,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
struct intel_connector *intel_connector = intel_dp->attached_connector;
struct intel_digital_connector_state *intel_conn_state =
to_intel_digital_connector_state(conn_state);
- bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
+ bool constant_n = drm_dp_has_quirk(&intel_dp->desc, 0,
DP_DPCD_QUIRK_CONSTANT_N);
int ret = 0, output_bpp;
@@ -4514,7 +4514,8 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
* 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, DP_DPCD_QUIRK_NO_SINK_COUNT)) {
+ !drm_dp_has_quirk(&intel_dp->desc, 0,
+ DP_DPCD_QUIRK_NO_SINK_COUNT)) {
u8 count;
ssize_t r;
@@ -5681,6 +5682,7 @@ intel_dp_set_edid(struct intel_dp *intel_dp)
intel_dp->has_audio = drm_detect_monitor_audio(edid);
drm_dp_cec_set_edid(&intel_dp->aux, edid);
+ intel_dp->edid_quirks = drm_dp_get_edid_quirks(edid);
}
static void
@@ -5693,6 +5695,7 @@ intel_dp_unset_edid(struct intel_dp *intel_dp)
intel_connector->detect_edid = NULL;
intel_dp->has_audio = false;
+ intel_dp->edid_quirks = 0;
}
static int
@@ -7565,8 +7568,8 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
edid = drm_get_edid(connector, &intel_dp->aux.ddc);
if (edid) {
if (drm_add_edid_modes(connector, edid)) {
- drm_connector_update_edid_property(connector,
- edid);
+ drm_connector_update_edid_property(connector, edid);
+ intel_dp->edid_quirks = drm_dp_get_edid_quirks(edid);
} else {
kfree(edid);
edid = ERR_PTR(-EINVAL);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index d7bfa7c350e99c0e278405e6c62aa1d9bc46aefc..39f5de9a8c7ce46b5678c55d8c1f17ee280fc3d6 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -50,7 +50,7 @@ static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
void *port = connector->port;
- bool constant_n = drm_dp_has_quirk(&intel_dp->desc,
+ bool constant_n = drm_dp_has_quirk(&intel_dp->desc, 0,
DP_DPCD_QUIRK_CONSTANT_N);
int bpp, slots = -EINVAL;
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 7e754201f54d1313fcad2fb567d000196acdff46..fd9b146e3abac6146c0ae8867f7a0de68e44aac9 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -304,7 +304,7 @@ void intel_psr_init_dpcd(struct intel_dp *intel_dp)
drm_dbg_kms(&dev_priv->drm, "eDP panel supports PSR version %x\n",
intel_dp->psr_dpcd[0]);
- if (drm_dp_has_quirk(&intel_dp->desc, DP_DPCD_QUIRK_NO_PSR)) {
+ if (drm_dp_has_quirk(&intel_dp->desc, 0, DP_DPCD_QUIRK_NO_PSR)) {
drm_dbg_kms(&dev_priv->drm,
"PSR support not currently available for this panel\n");
return;
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 262faf9e5e9400522325e47dd9ab0fa35e6a845d..7f5dd2ee4a9415d85d395938716d0898444419ee 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1495,13 +1495,16 @@ struct drm_dp_desc {
int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
bool is_branch);
+u32 drm_dp_get_edid_quirks(const struct edid *edid);
/**
* enum drm_dp_quirk - Display Port sink/branch device specific quirks
*
* Display Port sink and branch devices in the wild have a variety of bugs, try
* to collect them here. The quirks are shared, but it's up to the drivers to
- * implement workarounds for them.
+ * implement workarounds for them. Note that because some devices have
+ * unreliable OUIDs, the EDID of sinks should also be checked for quirks using
+ * drm_dp_get_edid_quirks().
*/
enum drm_dp_quirk {
/**
@@ -1537,14 +1540,16 @@ enum drm_dp_quirk {
/**
* drm_dp_has_quirk() - does the DP device have a specific quirk
* @desc: Device decriptor filled by drm_dp_read_desc()
+ * @edid_quirks: Optional quirk bitmask filled by drm_dp_get_edid_quirks()
* @quirk: Quirk to query for
*
* Return true if DP device identified by @desc has @quirk.
*/
static inline bool
-drm_dp_has_quirk(const struct drm_dp_desc *desc, enum drm_dp_quirk quirk)
+drm_dp_has_quirk(const struct drm_dp_desc *desc, u32 edid_quirks,
+ enum drm_dp_quirk quirk)
{
- return desc->quirks & BIT(quirk);
+ return (desc->quirks | edid_quirks) & BIT(quirk);
}
#ifdef CONFIG_DRM_DP_CEC