For WCN6855, board ID specific NVM needs to be downloaded once board ID is available, but the default NVM is always downloaded currently, and the wrong NVM causes poor RF performance which effects user experience.

Fix by downloading board ID specific NVM if board ID is available.

Cc: Bjorn Andersson bjorande@quicinc.com Cc: Aiqun Yu (Maria) quic_aiquny@quicinc.com Cc: Cheng Jiang quic_chejiang@quicinc.com Cc: Johan Hovold johan@kernel.org Cc: Jens Glathe jens.glathe@oldschoolsolutions.biz Cc: Steev Klimaszewski steev@kali.org Cc: Paul Menzel pmenzel@molgen.mpg.de Fixes: 095327fede00 ("Bluetooth: hci_qca: Add support for QTI Bluetooth chip wcn6855") Cc: stable@vger.kernel.org # 6.4 Reviewed-by: Johan Hovold johan+linaro@kernel.org Tested-by: Johan Hovold johan+linaro@kernel.org Tested-by: Steev Klimaszewski steev@kali.org Tested-by: Jens Glathe jens.glathe@oldschoolsolutions.biz Signed-off-by: Zijun Hu quic_zijuhu@quicinc.com --- Thank you Paul, Jens, Steev, Johan, Luiz for code review, various verification, comments and suggestions. these comments and suggestions are very good, and all of them are taken by this v2 patch.

Regarding the variant 'g', sorry for that i can say nothing due to confidential information (CCI), but fortunately, we don't need to care about its difference against one without 'g' from BT host perspective, qca_get_hsp_nvm_name_generic() shows how to map BT chip to firmware.

I will help to backport it to LTS kernels ASAP once this commit is mainlined. --- Changes in v2: - Correct subject and commit message - Temporarily add nvm fallback logic to speed up backport. — Add fix/stable tags as suggested by Luiz and Johan - Link to v1: https://lore.kernel.org/r/20241113-x13s_wcn6855_fix-v1-1-15af0aa2549c@quicin... --- drivers/bluetooth/btqca.c | 44 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c index dfbbac92242a..ddfe7e3c9b50 100644 --- a/drivers/bluetooth/btqca.c +++ b/drivers/bluetooth/btqca.c @@ -717,6 +717,29 @@ static void qca_generate_hsp_nvm_name(char *fwname, size_t max_size, snprintf(fwname, max_size, "qca/hpnv%02x%s.%x", rom_ver, variant, bid); }

+static void qca_get_hsp_nvm_name_generic(struct qca_fw_config *cfg, + struct qca_btsoc_version ver, + u8 rom_ver, u16 bid) +{ + const char *variant; + + /* hsp gf chip */ + if ((le32_to_cpu(ver.soc_id) & QCA_HSP_GF_SOC_MASK) == QCA_HSP_GF_SOC_ID) + variant = "g"; + else + variant = ""; + + if (bid == 0x0) + snprintf(cfg->fwname, sizeof(cfg->fwname), "qca/hpnv%02x%s.bin", + rom_ver, variant); + else if (bid & 0xff00) + snprintf(cfg->fwname, sizeof(cfg->fwname), "qca/hpnv%02x%s.b%x", + rom_ver, variant, bid); + else + snprintf(cfg->fwname, sizeof(cfg->fwname), "qca/hpnv%02x%s.b%02x", + rom_ver, variant, bid); +} + static inline void qca_get_nvm_name_generic(struct qca_fw_config *cfg, const char *stem, u8 rom_ver, u16 bid) { @@ -810,8 +833,15 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate, /* Give the controller some time to get ready to receive the NVM */ msleep(10);

- if (soc_type == QCA_QCA2066 || soc_type == QCA_WCN7850) + switch (soc_type) { + case QCA_QCA2066: + case QCA_WCN6855: + case QCA_WCN7850: qca_read_fw_board_id(hdev, &boardid); + break; + default: + break; + }

/* Download NVM configuration */ config.type = TLV_TYPE_NVM; @@ -848,8 +878,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate, "qca/msnv%02x.bin", rom_ver); break; case QCA_WCN6855: - snprintf(config.fwname, sizeof(config.fwname), - "qca/hpnv%02x.bin", rom_ver); + qca_get_hsp_nvm_name_generic(&config, ver, rom_ver, boardid); break; case QCA_WCN7850: qca_get_nvm_name_generic(&config, "hmt", rom_ver, boardid); @@ -861,9 +890,18 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate, } }

+download_nvm: err = qca_download_firmware(hdev, &config, soc_type, rom_ver); if (err < 0) { bt_dev_err(hdev, "QCA Failed to download NVM (%d)", err); + if (err == -ENOENT && boardid != 0 && + soc_type == QCA_WCN6855) { + boardid = 0; + qca_get_hsp_nvm_name_generic(&config, ver, + rom_ver, boardid); + bt_dev_warn(hdev, "QCA fallback to default NVM"); + goto download_nvm; + } return err; }

--- base-commit: e88b020190bf5bc3e7ce5bd8003fc39b23cc95fe change-id: 20241113-x13s_wcn6855_fix-53c573ff7878

Best regards,