diff options
Diffstat (limited to 'package/kernel/mac80211/patches/brcm/321-v4.21-0002-brcmfmac-Fix-ccode-from-EFI-nvram-when-necessary.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/brcm/321-v4.21-0002-brcmfmac-Fix-ccode-from-EFI-nvram-when-necessary.patch | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/brcm/321-v4.21-0002-brcmfmac-Fix-ccode-from-EFI-nvram-when-necessary.patch b/package/kernel/mac80211/patches/brcm/321-v4.21-0002-brcmfmac-Fix-ccode-from-EFI-nvram-when-necessary.patch new file mode 100644 index 0000000000..c2fd620d6c --- /dev/null +++ b/package/kernel/mac80211/patches/brcm/321-v4.21-0002-brcmfmac-Fix-ccode-from-EFI-nvram-when-necessary.patch @@ -0,0 +1,97 @@ +From 29ec3394f0bd85c22674ab6693d92da5e2324610 Mon Sep 17 00:00:00 2001 +From: Hans de Goede <hdegoede@redhat.com> +Date: Thu, 11 Oct 2018 11:51:07 +0200 +Subject: [PATCH] brcmfmac: Fix ccode from EFI nvram when necessary + +In some cases the EFI-var stored nvram contains "ccode=ALL" or "ccode=XV" +to specify "worldwide" compatible settings, but these 2 ccode-s do not work +properly. + +I've tested the different known "worldwide" ccode-s used in various nvram +sources with the latest firmwares from linux-firmware for various brcmfmac +models, here is a simplified (*) table with what each setting results in: + +ALL: 12-14 disab, U-NII-1, U-NII-2 no-IR/radar, U-NII-3 +XV: 12-14 no-IR, disables all 5G channels +XY: 12-13 enab, 14 disab, U-NII-1 enab, U-NII-2 no-IR/radar, U-NII-3 disab +X2: 12-13 no-IR, 14 dis, U-NII-1 no-IR, U-NII-2 no-IR/radar, U-NII-3 no-IR + +Where 12,13,14 are 2.4G channels 12-14 and U-NII-1/2/3 are the 3 different +5G channel groups. no-IR is no-Initiate-Radiation, we will never send on +these channels without first having received valid wifi traffic there. + +This immediately shows that both ALL and XV are not as worldwide as we want +them to be. ALL causes channels 12 and 13 to not be available and XV causes +all 5GHz channels to not be available. Also ALL unconditionally enables the +U-NII-1 and U-NII-3 5G groups, while we really should be using no-IR for +these. + +This commit replace XV and ALL with X2, which allows usage of chan 12-13 +and 5G channels, but only after receiving valid wifi traffic there first. + +Note that this configure the firmware's channel limits, the kernels own +regulatory restrictions based on e.g. regulatory info received from the +access-point, will be applied on top of this. + +This fixes channels 12+13 not working on the Asus T200TA and the Lenovo +Mixx 2 8 and 5G channels not working on the Asus T100HA. + +This has been tested on the following models: Acer Iconia Tab8 w1-810, +Acer One 10, Asus T100CHI, Asus T100HA, Asus T100TA, Asus T200TA and a +Lenovo Mixx 2 8. + +*) There are some exceptions to this table: +1) On really old firmware e.g. linux-firmware's 2011 brcmfmac4330-sdio.bin + ALL really means all, unconditionally enabling everything +2) The exact meaning might be influenced by setting the regrev nvram var. + Specifically using ccode=XV + regrev=1 on brcmfmac43241b4 leads to: + 12-14 no-ir, U-NII-1 no-ir, U-NII-2 no-ir/radar, U-NII-3 no-ir + But only on the brcmfmac43241b4 and not on e.g. the brcmfmac43340 + +Tested-by: Hans de Goede <hdegoede@redhat.com> +Signed-off-by: Hans de Goede <hdegoede@redhat.com> +Signed-off-by: Kalle Valo <kvalo@codeaurora.org> +--- + .../broadcom/brcm80211/brcmfmac/firmware.c | 24 ++++++++++++++++++++++ + 1 file changed, 24 insertions(+) + +--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c ++++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c +@@ -447,6 +447,29 @@ struct brcmf_fw { + static void brcmf_fw_request_done(const struct firmware *fw, void *ctx); + + #ifdef CONFIG_EFI ++/* In some cases the EFI-var stored nvram contains "ccode=ALL" or "ccode=XV" ++ * to specify "worldwide" compatible settings, but these 2 ccode-s do not work ++ * properly. "ccode=ALL" causes channels 12 and 13 to not be available, ++ * "ccode=XV" causes all 5GHz channels to not be available. So we replace both ++ * with "ccode=X2" which allows channels 12+13 and 5Ghz channels in ++ * no-Initiate-Radiation mode. This means that we will never send on these ++ * channels without first having received valid wifi traffic on the channel. ++ */ ++static void brcmf_fw_fix_efi_nvram_ccode(char *data, unsigned long data_len) ++{ ++ char *ccode; ++ ++ ccode = strnstr((char *)data, "ccode=ALL", data_len); ++ if (!ccode) ++ ccode = strnstr((char *)data, "ccode=XV\r", data_len); ++ if (!ccode) ++ return; ++ ++ ccode[6] = 'X'; ++ ccode[7] = '2'; ++ ccode[8] = '\r'; ++} ++ + static u8 *brcmf_fw_nvram_from_efi(size_t *data_len_ret) + { + const u16 name[] = { 'n', 'v', 'r', 'a', 'm', 0 }; +@@ -476,6 +499,7 @@ static u8 *brcmf_fw_nvram_from_efi(size_ + if (err) + goto fail; + ++ brcmf_fw_fix_efi_nvram_ccode(data, data_len); + brcmf_info("Using nvram EFI variable\n"); + + kfree(nvram_efivar); |