Thread (7 messages) 7 messages, 3 authors, 2020-03-26

Re: [PATCH v6 1/2] rtw88: add regulatory process strategy for different chipset

From: Brian Norris <briannorris@chromium.org>
Date: 2020-03-24 16:51:11

Hi,

On Tue, Mar 24, 2020 at 03:52:15PM +0800, yhchuang@realtek.com wrote:
quoted hunk ↗ jump to hunk
--- a/drivers/net/wireless/realtek/rtw88/Kconfig
+++ b/drivers/net/wireless/realtek/rtw88/Kconfig
@@ -52,4 +52,14 @@ config RTW88_DEBUGFS
 
 	  If unsure, say Y to simplify debug problems
 
+config RTW88_REGD_USER_REG_HINTS
+	bool "Realtek rtw88 user regulatory hints"
+	depends on RTW88_CORE
+	default n
+	help
+	  Enable regulatoy user hints
+
+	  If unsure, say N. This should only be allowed on distributions
+	  that need this to correct the regulatory.
+
I'm still not sure why rtw88 needs this, and nobody else does. I read
your commit message, but that doesn't sound like something that belongs
in a single driver still.
quoted hunk ↗ jump to hunk
 endif
diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 7640e97706f5..5d43bef91a3c 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -1501,8 +1501,9 @@ int rtw_register_hw(struct rtw_dev *rtwdev, struct ieee80211_hw *hw)
 		return ret;
 	}
 
-	if (regulatory_hint(hw->wiphy, rtwdev->regd.alpha2))
-		rtw_err(rtwdev, "regulatory_hint fail\n");
+	ret = regulatory_hint(hw->wiphy, rtwdev->efuse.country_code);
+	if (ret)
+		rtw_warn(rtwdev, "failed to hint regulatory: %d\n", ret);
I don't think this is what you want; you had it right in previous
revisions:

	if (!rtwdev->efuse.country_worldwide) {
		if (regulatory_hint(hw->wiphy, rtwdev->efuse.country_code))
			rtw_err( ... );
	}

Without the 'country_worlwide' check, you start "hinting" (even on
worldwide chips) that you really wanted "country" 00 only, and so we
*never* adapt to more strict country settings. That's not how world-wide
settings are supposed to work.
quoted hunk ↗ jump to hunk
 
 	rtw_debugfs_init(rtwdev);
 
diff --git a/drivers/net/wireless/realtek/rtw88/regd.c b/drivers/net/wireless/realtek/rtw88/regd.c
index 69744dd65968..4cc1234bfb9a 100644
--- a/drivers/net/wireless/realtek/rtw88/regd.c
+++ b/drivers/net/wireless/realtek/rtw88/regd.c
 static int rtw_regd_notifier_apply(struct rtw_dev *rtwdev,
 				   struct wiphy *wiphy,
 				   struct regulatory_request *request)
 {
-	if (request->initiator == NL80211_REGDOM_SET_BY_USER)
+	if (request->initiator == NL80211_REGDOM_SET_BY_DRIVER)
Why are you ignoring SET_BY_DRIVER? That's what happens when (a few
lines up) you call regulatory_hint(). At a minimum, that doesn't deserve
a loud error print when we "fail" this function -- you should handle it
properly.

Brian
+		return -ENOTSUPP;
+
+	if (request->initiator == NL80211_REGDOM_SET_BY_USER &&
+	    !IS_ENABLED(CONFIG_RTW88_REGD_USER_REG_HINTS))
+		return -EPERM;
+
+	if (request->initiator == NL80211_REGDOM_SET_BY_CORE) {
+		char *country_code;
+
+		/* return to the efuse setting */
+		country_code = rtwdev->efuse.country_code;
+		rtwdev->regd = rtw_regd_find_reg_by_name(country_code);
 		return 0;
+	}
+
 	rtwdev->regd = rtw_regd_find_reg_by_name(request->alpha2);
 	rtw_regd_apply_world_flags(wiphy, request->initiator);
 
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