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From:   gregory.greenman@intel.com
To:     kvalo@kernel.org, johannes@sipsolutions.net
Cc:     linux-wireless@vger.kernel.org,
        Johannes Berg <johannes.berg@intel.com>,
        Gregory Greenman <gregory.greenman@intel.com>
Subject: [PATCH 2/9] wifi: iwlwifi: mvm: support 320 MHz PHY configuration
Date:   Sun, 20 Nov 2022 19:00:32 +0200
Message-Id: <20221120185147.fc33093422ef.If56c94a9bf20c050f35d2421b680e400a9f4aeb8@changeid>
In-Reply-To: <20221120170039.1788067-1-gregory.greenman@intel.com>
References: <20221120170039.1788067-1-gregory.greenman@intel.com>
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From: Johannes Berg <johannes.berg@intel.com>

Support 320 MHz PHY configuration and while doing so rewrite
the code since we'd otherwise double the number of cases in
the switch statement.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 .../wireless/intel/iwlwifi/fw/api/phy-ctxt.h  | 33 ++++++------
 .../net/wireless/intel/iwlwifi/mvm/mac80211.c |  2 +-
 .../net/wireless/intel/iwlwifi/mvm/phy-ctxt.c | 54 +++++++++----------
 3 files changed, 44 insertions(+), 45 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/phy-ctxt.h b/drivers/net/wireless/intel/iwlwifi/fw/api/phy-ctxt.h
index e66f77924f83..2f7d8558becd 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/api/phy-ctxt.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/phy-ctxt.h
@@ -13,10 +13,12 @@
 #define PHY_BAND_6 (2)
 
 /* Supported channel width, vary if there is VHT support */
-#define PHY_VHT_CHANNEL_MODE20	(0x0)
-#define PHY_VHT_CHANNEL_MODE40	(0x1)
-#define PHY_VHT_CHANNEL_MODE80	(0x2)
-#define PHY_VHT_CHANNEL_MODE160	(0x3)
+#define IWL_PHY_CHANNEL_MODE20	0x0
+#define IWL_PHY_CHANNEL_MODE40	0x1
+#define IWL_PHY_CHANNEL_MODE80	0x2
+#define IWL_PHY_CHANNEL_MODE160	0x3
+/* and 320 MHz for EHT */
+#define IWL_PHY_CHANNEL_MODE320	0x4
 
 /*
  * Control channel position:
@@ -24,20 +26,17 @@
  * For VHT - bit-2 marks if the control is lower/upper relative to center-freq
  *   bits-1:0 mark the distance from the center freq. for 20Mhz, offset is 0.
  *                                   center_freq
- *                                        |
- * 40Mhz                          |_______|_______|
- * 80Mhz                  |_______|_______|_______|_______|
- * 160Mhz |_______|_______|_______|_______|_______|_______|_______|_______|
- * code      011     010     001     000  |  100     101     110    111
+ * For EHT - bit-3 is used for extended distance
+ *                                                |
+ * 40Mhz                                     |____|____|
+ * 80Mhz                                |____|____|____|____|
+ * 160Mhz                     |____|____|____|____|____|____|____|____|
+ * 320MHz |____|____|____|____|____|____|____|____|____|____|____|____|____|____|____|____|
+ * code    1011 1010 1001 1000 0011 0010 0001 0000 0100 0101 0110 0111 1100 1101 1110 1111
  */
-#define PHY_VHT_CTRL_POS_1_BELOW  (0x0)
-#define PHY_VHT_CTRL_POS_2_BELOW  (0x1)
-#define PHY_VHT_CTRL_POS_3_BELOW  (0x2)
-#define PHY_VHT_CTRL_POS_4_BELOW  (0x3)
-#define PHY_VHT_CTRL_POS_1_ABOVE  (0x4)
-#define PHY_VHT_CTRL_POS_2_ABOVE  (0x5)
-#define PHY_VHT_CTRL_POS_3_ABOVE  (0x6)
-#define PHY_VHT_CTRL_POS_4_ABOVE  (0x7)
+#define IWL_PHY_CTRL_POS_ABOVE		0x4
+#define IWL_PHY_CTRL_POS_OFFS_EXT	0x8
+#define IWL_PHY_CTRL_POS_OFFS_MSK	0x3
 
 /*
  * struct iwl_fw_channel_info_v1 - channel information
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index a81dd488caa8..57aa10466637 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -3777,7 +3777,7 @@ static int iwl_mvm_send_aux_roc_cmd(struct iwl_mvm *mvm,
 	/* Set the channel info data */
 	iwl_mvm_set_chan_info(mvm, &aux_roc_req.channel_info, channel->hw_value,
 			      iwl_mvm_phy_band_from_nl80211(channel->band),
-			      PHY_VHT_CHANNEL_MODE20,
+			      IWL_PHY_CHANNEL_MODE20,
 			      0);
 
 	/* Set the time and duration */
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c b/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
index a3cefbc43e80..06f4203fb989 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
@@ -14,16 +14,18 @@ u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
 	switch (chandef->width) {
 	case NL80211_CHAN_WIDTH_20_NOHT:
 	case NL80211_CHAN_WIDTH_20:
-		return PHY_VHT_CHANNEL_MODE20;
+		return IWL_PHY_CHANNEL_MODE20;
 	case NL80211_CHAN_WIDTH_40:
-		return PHY_VHT_CHANNEL_MODE40;
+		return IWL_PHY_CHANNEL_MODE40;
 	case NL80211_CHAN_WIDTH_80:
-		return PHY_VHT_CHANNEL_MODE80;
+		return IWL_PHY_CHANNEL_MODE80;
 	case NL80211_CHAN_WIDTH_160:
-		return PHY_VHT_CHANNEL_MODE160;
+		return IWL_PHY_CHANNEL_MODE160;
+	case NL80211_CHAN_WIDTH_320:
+		return IWL_PHY_CHANNEL_MODE320;
 	default:
 		WARN(1, "Invalid channel width=%u", chandef->width);
-		return PHY_VHT_CHANNEL_MODE20;
+		return IWL_PHY_CHANNEL_MODE20;
 	}
 }
 
@@ -33,34 +35,32 @@ u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
  */
 u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
 {
-	switch (chandef->chan->center_freq - chandef->center_freq1) {
-	case -70:
-		return PHY_VHT_CTRL_POS_4_BELOW;
-	case -50:
-		return PHY_VHT_CTRL_POS_3_BELOW;
-	case -30:
-		return PHY_VHT_CTRL_POS_2_BELOW;
-	case -10:
-		return PHY_VHT_CTRL_POS_1_BELOW;
-	case  10:
-		return PHY_VHT_CTRL_POS_1_ABOVE;
-	case  30:
-		return PHY_VHT_CTRL_POS_2_ABOVE;
-	case  50:
-		return PHY_VHT_CTRL_POS_3_ABOVE;
-	case  70:
-		return PHY_VHT_CTRL_POS_4_ABOVE;
-	default:
-		WARN(1, "Invalid channel definition");
-		fallthrough;
-	case 0:
+	int offs = chandef->chan->center_freq - chandef->center_freq1;
+	int abs_offs = abs(offs);
+	u8 ret;
+
+	if (offs == 0) {
 		/*
 		 * The FW is expected to check the control channel position only
 		 * when in HT/VHT and the channel width is not 20MHz. Return
 		 * this value as the default one.
 		 */
-		return PHY_VHT_CTRL_POS_1_BELOW;
+		return 0;
 	}
+
+	/* this results in a value 0-7, i.e. fitting into 0b0111 */
+	ret = (abs_offs - 10) / 20;
+	/*
+	 * But we need the value to be in 0b1011 because 0b0100 is
+	 * IWL_PHY_CTRL_POS_ABOVE, so shift bit 2 up to land in
+	 * IWL_PHY_CTRL_POS_OFFS_EXT (0b1000)
+	 */
+	ret = (ret & IWL_PHY_CTRL_POS_OFFS_MSK) |
+	      ((ret & BIT(2)) << 1);
+	/* and add the above bit */
+	ret |= (offs > 0) * IWL_PHY_CTRL_POS_ABOVE;
+
+	return ret;
 }
 
 /*
-- 
2.35.3