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[80.71.142.18]) by smtp.gmail.com with ESMTPSA id g1-20020a17090604c100b0072b16a57cdcsm738785eja.118.2022.07.11.05.30.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Jul 2022 05:30:48 -0700 (PDT) From: =?utf-8?q?Alvin_=C5=A0ipraga?= To: Kalle Valo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Arend van Spriel , Franky Lin , Hante Meuleman , van Spriel Cc: Ahmad Fatoum , =?utf-8?q?Alvin_=C5=A0ipraga?= , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com Subject: [PATCH 2/2] wifi: brcmfmac: support brcm,ccode-map-trivial DT property Date: Mon, 11 Jul 2022 14:30:04 +0200 Message-Id: <20220711123005.3055300-3-alvin@pqrs.dk> X-Mailer: git-send-email 2.37.0 In-Reply-To: <20220711123005.3055300-1-alvin@pqrs.dk> References: <20220711123005.3055300-1-alvin@pqrs.dk> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Alvin Šipraga Commit a21bf90e927f ("brcmfmac: use ISO3166 country code and 0 rev as fallback on some devices") introduced a fallback mechanism whereby a trivial mapping from ISO3166 country codes to firmware country code and revision is used on some devices. This fallback operates on the device level, so it is enabled only for certain supported chipsets. In general though, the firmware country codes are determined by the CLM blob, which is board-specific and may vary despite the underlying chipset being the same. The aforementioned commit is actually a refinement of a previous commit that was reverted in commit 151a7c12c4fc ("Revert "brcmfmac: use ISO3166 country code and 0 rev as fallback"") due to regressions with a BCM4359 device. The refinement restricted the fallback mechanism to specific chipsets such as the BCM4345. We use a chipset - CYW88359 - that the driver identifies as a BCM4359 too. But in our case, the CLM blob uses ISO3166 country codes internally, and all with revision 0. So the trivial mapping is exactly what is needed in order for the driver to sync the kernel regulatory domain to the firmware. This is just a matter of how the CLM blob was prepared by the hardware vendor. The same could hold for other boards too. Although the brcm,ccode-map device tree property is useful for cases where the mapping is more complex, the trivial case invites a much simpler specification. This patch adds support for parsing the brcm,ccode-map-trivial device tree property. Subordinate to the more specific brcm,ccode-map property, this new proprety simply informs the driver that the fallback method should be used in every case. In the absence of the new property in the device tree, expect no functional change. Signed-off-by: Alvin Šipraga Reviewed-by: Ahmad Fatoum --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 3 +++ drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h | 2 ++ drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c | 6 ++++++ 3 files changed, 11 insertions(+) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c index 3ae6779fe153..db45da33adfd 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c @@ -7481,6 +7481,9 @@ int brcmf_cfg80211_wait_vif_event(struct brcmf_cfg80211_info *cfg, static bool brmcf_use_iso3166_ccode_fallback(struct brcmf_pub *drvr) { + if (drvr->settings->trivial_ccode_map) + return true; + switch (drvr->bus_if->chip) { case BRCM_CC_4345_CHIP_ID: case BRCM_CC_43602_CHIP_ID: diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h index 15accc88d5c0..fe717cce5d55 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.h @@ -38,6 +38,7 @@ extern struct brcmf_mp_global_t brcmf_mp_global; * @fcmode: FWS flow control. * @roamoff: Firmware roaming off? * @ignore_probe_fail: Ignore probe failure. + * @trivial_ccode_map: Assume firmware uses ISO3166 country codes with rev 0 * @country_codes: If available, pointer to struct for translating country codes * @bus: Bus specific platform data. Only SDIO at the mmoment. */ @@ -48,6 +49,7 @@ struct brcmf_mp_device { bool roamoff; bool iapp; bool ignore_probe_fail; + bool trivial_ccode_map; struct brcmfmac_pd_cc *country_codes; const char *board_type; unsigned char mac[ETH_ALEN]; diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c index 083ac58f466d..1add942462f8 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c @@ -24,6 +24,12 @@ static int brcmf_of_get_country_codes(struct device *dev, count = of_property_count_strings(np, "brcm,ccode-map"); if (count < 0) { + /* If no explicit country code map is specified, check whether + * the trivial map should be used. + */ + settings->trivial_ccode_map = + of_property_read_bool(np, "brcm,ccode-map-trivial"); + /* The property is optional, so return success if it doesn't * exist. Otherwise propagate the error code. */