[PATCH v2] mt76: mt7921: introduce 160 MHz channel bandwidth support

From: Deren Wu <redacted>

Introduce the basic configuration for chips with BW160 capability

Signed-off-by: Deren Wu <redacted>
---
 drivers/net/wireless/mediatek/mt76/mt76.h            |  1 +
 drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c |  1 +
 drivers/net/wireless/mediatek/mt76/mt7921/init.c     |  4 ++++
 drivers/net/wireless/mediatek/mt76/mt7921/main.c     | 12 ++++++++++++
 4 files changed, 18 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index e2da720a91b6..babca8086027 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h

@@ -346,6 +346,7 @@ struct mt76_hw_cap {
 	bool has_2ghz;
 	bool has_5ghz;
 	bool has_6ghz;
+	bool has_bw160;
 };
 
 #define MT_DRV_TXWI_NO_FREE		BIT(0)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 26b4b875dcc0..3b42e1e8e970 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

@@ -1775,6 +1775,7 @@ static void mt76_connac_mcu_parse_phy_cap(struct mt76_dev *dev,
 	dev->phy.chainmask = dev->phy.antenna_mask;
 	dev->phy.cap.has_2ghz = cap->hw_path & BIT(WF0_24G);
 	dev->phy.cap.has_5ghz = cap->hw_path & BIT(WF0_5G);
+	dev->phy.cap.has_bw160 = cap->max_bw == IEEE80211_STA_RX_BW_160;
 }
 
 int mt76_connac_mcu_get_nic_capability(struct mt76_phy *phy)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
index 210998f086ab..30c0246fba3a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -264,6 +264,10 @@ int mt7921_register_device(struct mt7921_dev *dev)
 			IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 			IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE |
 			(3 << IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT);
+	if (dev->mt76.phy.cap.has_bw160)
+		dev->mphy.sband_5g.sband.vht_cap.cap |=
+			IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
+			IEEE80211_VHT_CAP_SHORT_GI_160;
 
 	dev->mphy.hw->wiphy->available_antennas_rx = dev->mphy.chainmask;
 	dev->mphy.hw->wiphy->available_antennas_tx = dev->mphy.chainmask;

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 633c6d2a57ac..af8c675f909f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -128,11 +128,23 @@ mt7921_init_he_caps(struct mt7921_phy *phy, enum nl80211_band band,
 				IEEE80211_HE_PHY_CAP9_RX_1024_QAM_LESS_THAN_242_TONE_RU |
 				IEEE80211_HE_PHY_CAP9_RX_FULL_BW_SU_USING_MU_WITH_COMP_SIGB |
 				IEEE80211_HE_PHY_CAP9_RX_FULL_BW_SU_USING_MU_WITH_NON_COMP_SIGB;
+
+			if (phy->mt76->cap.has_bw160) {
+				he_cap_elem->phy_cap_info[0] |=
+					IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
+				he_cap_elem->phy_cap_info[8] |=
+					IEEE80211_HE_PHY_CAP8_20MHZ_IN_160MHZ_HE_PPDU |
+					IEEE80211_HE_PHY_CAP8_80MHZ_IN_160MHZ_HE_PPDU;
+			}
 			break;
 		}
 
 		he_mcs->rx_mcs_80 = cpu_to_le16(mcs_map);
 		he_mcs->tx_mcs_80 = cpu_to_le16(mcs_map);
+		if (phy->mt76->cap.has_bw160) {
+			he_mcs->rx_mcs_160 = cpu_to_le16(mcs_map);
+			he_mcs->tx_mcs_160 = cpu_to_le16(mcs_map);
+		}
 
 		memset(he_cap->ppe_thres, 0, sizeof(he_cap->ppe_thres));
 		if (he_cap_elem->phy_cap_info[6] &

-- 
2.18.0


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On Mon, 2021-11-08 at 22:41 +0800, Deren Wu wrote:

But what about 80p80Mhz case?

Ryder


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On Sat, 2021-11-13 at 03:12 +0800, Ryder Lee wrote:

On Mon, 2021-11-08 at 22:41 +0800, Deren Wu wrote:

quoted

From: Deren Wu <redacted>

Introduce the basic configuration for chips with BW160 capability

Signed-off-by: Deren Wu <redacted>
---
 drivers/net/wireless/mediatek/mt76/mt76.h            |  1 +
 drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c |  1 +
 drivers/net/wireless/mediatek/mt76/mt7921/init.c     |  4 ++++
 drivers/net/wireless/mediatek/mt76/mt7921/main.c     | 12
++++++++++++
 4 files changed, 18 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h

b/drivers/net/wireless/mediatek/mt76/mt76.h
index e2da720a91b6..babca8086027 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h

@@ -346,6 +346,7 @@ struct mt76_hw_cap {
 	bool has_2ghz;
 	bool has_5ghz;
 	bool has_6ghz;
+	bool has_bw160;
 };
 
 #define MT_DRV_TXWI_NO_FREE		BIT(0)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 26b4b875dcc0..3b42e1e8e970 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

@@ -1775,6 +1775,7 @@ static void

mt76_connac_mcu_parse_phy_cap(struct mt76_dev *dev,
 	dev->phy.chainmask = dev->phy.antenna_mask;
 	dev->phy.cap.has_2ghz = cap->hw_path & BIT(WF0_24G);
 	dev->phy.cap.has_5ghz = cap->hw_path & BIT(WF0_5G);
+	dev->phy.cap.has_bw160 = cap->max_bw ==
IEEE80211_STA_RX_BW_160;
 }
 
 int mt76_connac_mcu_get_nic_capability(struct mt76_phy *phy)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c

b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
index 210998f086ab..30c0246fba3a 100644

--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -264,6 +264,10 @@ int mt7921_register_device(struct mt7921_dev

*dev)
 			IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 			IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE |
 			(3 << IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT);
+	if (dev->mt76.phy.cap.has_bw160)
+		dev->mphy.sband_5g.sband.vht_cap.cap |=
+			IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
+			IEEE80211_VHT_CAP_SHORT_GI_160;
 
 	dev->mphy.hw->wiphy->available_antennas_rx = dev-

quoted

mphy.chainmask;

 	dev->mphy.hw->wiphy->available_antennas_tx = dev-

quoted

mphy.chainmask;

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c

b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 633c6d2a57ac..af8c675f909f 100644

--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -128,11 +128,23 @@ mt7921_init_he_caps(struct mt7921_phy *phy,

enum nl80211_band band,
 				IEEE80211_HE_PHY_CAP9_RX_1024_QAM_LESS_
THAN_242_TONE_RU |
 				IEEE80211_HE_PHY_CAP9_RX_FULL_BW_SU_USI
NG_MU_WITH_COMP_SIGB |
 				IEEE80211_HE_PHY_CAP9_RX_FULL_BW_SU_USI
NG_MU_WITH_NON_COMP_SIGB;
+
+			if (phy->mt76->cap.has_bw160) {
+				he_cap_elem->phy_cap_info[0] |=
+					IEEE80211_HE_PHY_CAP0_CHANNEL_W
IDTH_SET_160MHZ_IN_5G;
+				he_cap_elem->phy_cap_info[8] |=
+					IEEE80211_HE_PHY_CAP8_20MHZ_IN_
160MHZ_HE_PPDU |
+					IEEE80211_HE_PHY_CAP8_80MHZ_IN_
160MHZ_HE_PPDU;
+			}
 			break;
 		}
 
 		he_mcs->rx_mcs_80 = cpu_to_le16(mcs_map);
 		he_mcs->tx_mcs_80 = cpu_to_le16(mcs_map);
+		if (phy->mt76->cap.has_bw160) {
+			he_mcs->rx_mcs_160 = cpu_to_le16(mcs_map);
+			he_mcs->tx_mcs_160 = cpu_to_le16(mcs_map);
+		}
 

But what about 80p80Mhz case?

Ryder

Since 80p80MHz is not supprted in mt7921, we should not register this
capability to mac80211. When the feature coming, we may have a new
config cap.has_bw80p80 to adapte the new flow.

Regards,
Deren


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On Sat, 2021-11-13 at 11:39 +0800, Deren Wu wrote:

On Sat, 2021-11-13 at 03:12 +0800, Ryder Lee wrote:

quoted

On Mon, 2021-11-08 at 22:41 +0800, Deren Wu wrote:

quoted

From: Deren Wu <redacted>

Introduce the basic configuration for chips with BW160 capability

Signed-off-by: Deren Wu <redacted>
---
 drivers/net/wireless/mediatek/mt76/mt76.h            |  1 +
 drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c |  1 +
 drivers/net/wireless/mediatek/mt76/mt7921/init.c     |  4 ++++
 drivers/net/wireless/mediatek/mt76/mt7921/main.c     | 12
++++++++++++
 4 files changed, 18 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h

b/drivers/net/wireless/mediatek/mt76/mt76.h
index e2da720a91b6..babca8086027 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h

@@ -346,6 +346,7 @@ struct mt76_hw_cap {
 	bool has_2ghz;
 	bool has_5ghz;
 	bool has_6ghz;
+	bool has_bw160;
 };
 
 #define MT_DRV_TXWI_NO_FREE		BIT(0)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 26b4b875dcc0..3b42e1e8e970 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

@@ -1775,6 +1775,7 @@ static void

mt76_connac_mcu_parse_phy_cap(struct mt76_dev *dev,
 	dev->phy.chainmask = dev->phy.antenna_mask;
 	dev->phy.cap.has_2ghz = cap->hw_path & BIT(WF0_24G);
 	dev->phy.cap.has_5ghz = cap->hw_path & BIT(WF0_5G);
+	dev->phy.cap.has_bw160 = cap->max_bw ==
IEEE80211_STA_RX_BW_160;
 }
 
 int mt76_connac_mcu_get_nic_capability(struct mt76_phy *phy)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c

b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
index 210998f086ab..30c0246fba3a 100644

--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -264,6 +264,10 @@ int mt7921_register_device(struct mt7921_dev

*dev)
 			IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 			IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE |
 			(3 << IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT);
+	if (dev->mt76.phy.cap.has_bw160)
+		dev->mphy.sband_5g.sband.vht_cap.cap |=
+			IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
+			IEEE80211_VHT_CAP_SHORT_GI_160;
 
 	dev->mphy.hw->wiphy->available_antennas_rx = dev-

quoted

mphy.chainmask;

 	dev->mphy.hw->wiphy->available_antennas_tx = dev-

quoted

mphy.chainmask;

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c

b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 633c6d2a57ac..af8c675f909f 100644

--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -128,11 +128,23 @@ mt7921_init_he_caps(struct mt7921_phy *phy,

enum nl80211_band band,
 				IEEE80211_HE_PHY_CAP9_RX_1024_QAM_LESS_
THAN_242_TONE_RU |
 				IEEE80211_HE_PHY_CAP9_RX_FULL_BW_SU_USI
NG_MU_WITH_COMP_SIGB |
 				IEEE80211_HE_PHY_CAP9_RX_FULL_BW_SU_USI
NG_MU_WITH_NON_COMP_SIGB;
+
+			if (phy->mt76->cap.has_bw160) {
+				he_cap_elem->phy_cap_info[0] |=
+					IEEE80211_HE_PHY_CAP0_CHANNEL_W
IDTH_SET_160MHZ_IN_5G;
+				he_cap_elem->phy_cap_info[8] |=
+					IEEE80211_HE_PHY_CAP8_20MHZ_IN_
160MHZ_HE_PPDU |
+					IEEE80211_HE_PHY_CAP8_80MHZ_IN_
160MHZ_HE_PPDU;
+			}
 			break;
 		}
 
 		he_mcs->rx_mcs_80 = cpu_to_le16(mcs_map);
 		he_mcs->tx_mcs_80 = cpu_to_le16(mcs_map);
+		if (phy->mt76->cap.has_bw160) {
+			he_mcs->rx_mcs_160 = cpu_to_le16(mcs_map);
+			he_mcs->tx_mcs_160 = cpu_to_le16(mcs_map);
+		}
 

But what about 80p80Mhz case?

Ryder

Since 80p80MHz is not supprted in mt7921, we should not register this
capability to mac80211. When the feature coming, we may have a new
config cap.has_bw80p80 to adapte the new flow.

Then, how to tell 80p80M and 160M apart with only checking
IEEE80211_STA_RX_BW_160? 

 * @IEEE80211_STA_RX_BW_160: station can receive up to 160 MHz
 *	(including 80+80 MHz)

Maybe move has_bw80p80 into mt7921_dev as it is not generic to me?


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Hi Ryder,

On Sat, 2021-11-13 at 12:08 +0800, Ryder Lee wrote:

On Sat, 2021-11-13 at 11:39 +0800, Deren Wu wrote:

quoted

On Sat, 2021-11-13 at 03:12 +0800, Ryder Lee wrote:

quoted

On Mon, 2021-11-08 at 22:41 +0800, Deren Wu wrote:

quoted

From: Deren Wu <redacted>

Introduce the basic configuration for chips with BW160
capability

Signed-off-by: Deren Wu <redacted>
---
 drivers/net/wireless/mediatek/mt76/mt76.h            |  1 +
 drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c |  1 +
 drivers/net/wireless/mediatek/mt76/mt7921/init.c     |  4 ++++
 drivers/net/wireless/mediatek/mt76/mt7921/main.c     | 12
++++++++++++
 4 files changed, 18 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h

b/drivers/net/wireless/mediatek/mt76/mt76.h
index e2da720a91b6..babca8086027 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h

@@ -346,6 +346,7 @@ struct mt76_hw_cap {
 	bool has_2ghz;
 	bool has_5ghz;
 	bool has_6ghz;
+	bool has_bw160;
 };
 
 #define MT_DRV_TXWI_NO_FREE		BIT(0)

diff --git
a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 26b4b875dcc0..3b42e1e8e970 100644

--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c

@@ -1775,6 +1775,7 @@ static void

mt76_connac_mcu_parse_phy_cap(struct mt76_dev *dev,
 	dev->phy.chainmask = dev->phy.antenna_mask;
 	dev->phy.cap.has_2ghz = cap->hw_path & BIT(WF0_24G);
 	dev->phy.cap.has_5ghz = cap->hw_path & BIT(WF0_5G);
+	dev->phy.cap.has_bw160 = cap->max_bw ==
IEEE80211_STA_RX_BW_160;
 }
 
 int mt76_connac_mcu_get_nic_capability(struct mt76_phy *phy)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c

b/drivers/net/wireless/mediatek/mt76/mt7921/init.c
index 210998f086ab..30c0246fba3a 100644

--- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -264,6 +264,10 @@ int mt7921_register_device(struct

mt7921_dev
*dev)
 			IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE
|
 			IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE
|
 			(3 <<
IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT);
+	if (dev->mt76.phy.cap.has_bw160)
+		dev->mphy.sband_5g.sband.vht_cap.cap |=
+			IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MH
Z |
+			IEEE80211_VHT_CAP_SHORT_GI_160;
 
 	dev->mphy.hw->wiphy->available_antennas_rx = dev-

quoted

mphy.chainmask;

 	dev->mphy.hw->wiphy->available_antennas_tx = dev-

quoted

mphy.chainmask;

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c

b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 633c6d2a57ac..af8c675f909f 100644

--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -128,11 +128,23 @@ mt7921_init_he_caps(struct mt7921_phy

*phy,
enum nl80211_band band,
 				IEEE80211_HE_PHY_CAP9_RX_1024_Q
AM_LESS_
THAN_242_TONE_RU |
 				IEEE80211_HE_PHY_CAP9_RX_FULL_B
W_SU_USI
NG_MU_WITH_COMP_SIGB |
 				IEEE80211_HE_PHY_CAP9_RX_FULL_B
W_SU_USI
NG_MU_WITH_NON_COMP_SIGB;
+
+			if (phy->mt76->cap.has_bw160) {
+				he_cap_elem->phy_cap_info[0] |=
+					IEEE80211_HE_PHY_CAP0_C
HANNEL_W
IDTH_SET_160MHZ_IN_5G;
+				he_cap_elem->phy_cap_info[8] |=
+					IEEE80211_HE_PHY_CAP8_2
0MHZ_IN_
160MHZ_HE_PPDU |
+					IEEE80211_HE_PHY_CAP8_8
0MHZ_IN_
160MHZ_HE_PPDU;
+			}
 			break;
 		}
 
 		he_mcs->rx_mcs_80 = cpu_to_le16(mcs_map);
 		he_mcs->tx_mcs_80 = cpu_to_le16(mcs_map);
+		if (phy->mt76->cap.has_bw160) {
+			he_mcs->rx_mcs_160 =
cpu_to_le16(mcs_map);
+			he_mcs->tx_mcs_160 =
cpu_to_le16(mcs_map);
+		}
 

But what about 80p80Mhz case?

Ryder

Since 80p80MHz is not supprted in mt7921, we should not register
this
capability to mac80211. When the feature coming, we may have a new
config cap.has_bw80p80 to adapte the new flow.

Then, how to tell 80p80M and 160M apart with only checking
IEEE80211_STA_RX_BW_160? 

 * @IEEE80211_STA_RX_BW_160: station can receive up to 160 MHz
 *	(including 80+80 MHz)

Maybe move has_bw80p80 into mt7921_dev as it is not generic to me?

As you noted, both 80p80M and 160M are included in
IEEE80211_STA_RX_BW_160. We may not check two features
by IEEE80211_STA_RX_BW_160 only. That is why I prefer to have
.has_bw160 and .has_80p80 at next stage.

With the new feature, HW should report different result in the flow of 
chip capability check. The check point should start from
mt76_connac_mcu_parse_XXXX_cap() and then we can know the real
capabilities of this HW chip.


Regards,
Deren


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quoted

quoted

Since 80p80MHz is not supprted in mt7921, we should not register
this
capability to mac80211. When the feature coming, we may have a
new
config cap.has_bw80p80 to adapte the new flow.

Then, how to tell 80p80M and 160M apart with only checking
IEEE80211_STA_RX_BW_160? 

 * @IEEE80211_STA_RX_BW_160: station can receive up to 160 MHz
 *	(including 80+80 MHz)

Maybe move has_bw80p80 into mt7921_dev as it is not generic to me?

As you noted, both 80p80M and 160M are included in
IEEE80211_STA_RX_BW_160. We may not check two features
by IEEE80211_STA_RX_BW_160 only. That is why I prefer to have
.has_bw160 and .has_80p80 at next stage.

With the new feature, HW should report different result in the flow
of 
chip capability check. The check point should start from
mt76_connac_mcu_parse_XXXX_cap() and then we can know the real
capabilities of this HW chip.

What about using device id? I think we can easily determine the BW
without adding .has_xx in to common core, and it looks more like a 7921specific stuff though.  


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