From patchwork Tue Oct 12 22:52:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Wang X-Patchwork-Id: 12553911 X-Patchwork-Delegate: nbd@nbd.name Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E662C433FE for ; Tue, 12 Oct 2021 23:03:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2550D604E9 for ; Tue, 12 Oct 2021 23:03:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235875AbhJLXFB (ORCPT ); Tue, 12 Oct 2021 19:05:01 -0400 Received: from mailgw02.mediatek.com ([216.200.240.185]:42737 "EHLO mailgw02.mediatek.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235872AbhJLXFA (ORCPT ); Tue, 12 Oct 2021 19:05:00 -0400 X-UUID: b96299a01fb14b0689f4ace6755c9893-20211012 X-UUID: b96299a01fb14b0689f4ace6755c9893-20211012 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1208093157; Tue, 12 Oct 2021 16:02:55 -0700 Received: from mtkcas10.mediatek.inc (172.21.101.39) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 12 Oct 2021 15:53:00 -0700 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 13 Oct 2021 06:53:00 +0800 From: To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , "Deren Wu" Subject: [PATCH v4 16/16] mt76: mt7921s: add reset support Date: Wed, 13 Oct 2021 06:52:09 +0800 Message-ID: <18a056ae02de75d6c4ae89743c3d39d65fc22e1b.1634077769.git.objelf@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Sean Wang Introduce wifi chip reset support for mt7921 device to recover mcu hangs or abnormal wifi system. Tested-by: Deren Wu Acked-by: Lorenzo Bianconi Co-developed-by: Deren Wu Signed-off-by: Deren Wu Signed-off-by: Sean Wang --- drivers/net/wireless/mediatek/mt76/mt76.h | 2 + .../net/wireless/mediatek/mt76/mt7921/init.c | 2 + .../net/wireless/mediatek/mt76/mt7921/mcu.c | 1 + .../wireless/mediatek/mt76/mt7921/mt7921.h | 4 + .../net/wireless/mediatek/mt76/mt7921/sdio.c | 3 + .../wireless/mediatek/mt76/mt7921/sdio_mac.c | 133 ++++++++++++++++++ .../wireless/mediatek/mt76/mt7921/sdio_mcu.c | 8 ++ .../net/wireless/mediatek/mt76/sdio_txrx.c | 32 ++++- 8 files changed, 184 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 31fc94cf21ac..35e79fd6a334 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -507,6 +507,7 @@ struct mt76_sdio { void *intr_data; int intr_size; u8 hw_ver; + wait_queue_head_t wait; struct { int pse_data_quota; @@ -1252,6 +1253,7 @@ int mt76s_alloc_queues(struct mt76_dev *dev); void mt76s_deinit(struct mt76_dev *dev); void mt76s_sdio_irq(struct sdio_func *func); void mt76s_txrx_worker(struct mt76_sdio *sdio); +bool mt76s_txqs_empty(struct mt76_dev *dev); int mt76s_hw_init(struct mt76_dev *dev, struct sdio_func *func, int hw_ver); u32 mt76s_rr(struct mt76_dev *dev, u32 offset); diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/init.c b/drivers/net/wireless/mediatek/mt76/mt7921/init.c index 2b7260be224f..87265045e2dd 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/init.c @@ -217,6 +217,8 @@ int mt7921_register_device(struct mt7921_dev *dev) spin_lock_init(&dev->pm.wake.lock); mutex_init(&dev->pm.mutex); init_waitqueue_head(&dev->pm.wait); + if (mt76_is_sdio(&dev->mt76)) + init_waitqueue_head(&dev->mt76.sdio.wait); spin_lock_init(&dev->pm.txq_lock); INIT_DELAYED_WORK(&dev->mphy.mac_work, mt7921_mac_work); INIT_DELAYED_WORK(&dev->phy.scan_work, mt7921_scan_work); diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c index 718f75f4fb76..908c01d41ca1 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mcu.c @@ -438,6 +438,7 @@ mt7921_mcu_rx_unsolicited_event(struct mt7921_dev *dev, struct sk_buff *skb) mt7921_mcu_debug_msg_event(dev, skb); break; case MCU_EVENT_COREDUMP: + dev->fw_assert = true; mt76_connac_mcu_coredump_event(&dev->mt76, skb, &dev->coredump); return; diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h index 6d0edb8ce1d6..c96d4e841e12 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h +++ b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h @@ -169,6 +169,7 @@ struct mt7921_dev { struct work_struct reset_work; bool hw_full_reset:1; bool hw_init_done:1; + bool fw_assert:1; struct list_head sta_poll_list; spinlock_t sta_poll_lock; @@ -412,6 +413,9 @@ void mt7921e_queue_rx_skb(struct mt76_dev *mdev, enum mt76_rxq_id q, struct sk_buff *skb); int mt7921e_mac_reset(struct mt7921_dev *dev); int mt7921e_mcu_init(struct mt7921_dev *dev); +int mt7921s_wfsys_reset(struct mt7921_dev *dev); +int mt7921s_mac_reset(struct mt7921_dev *dev); +int mt7921s_init_reset(struct mt7921_dev *dev); int mt7921e_mcu_drv_pmctrl(struct mt7921_dev *dev); int mt7921e_mcu_fw_pmctrl(struct mt7921_dev *dev); diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c index 87d0954a7989..d6aa4c07cc99 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c @@ -46,6 +46,7 @@ static void mt7921s_unregister_device(struct mt7921_dev *dev) cancel_work_sync(&pm->wake_work); mt76s_deinit(&dev->mt76); + mt7921s_wfsys_reset(dev); mt7921_mcu_exit(dev); mt76_free_device(&dev->mt76); @@ -80,6 +81,8 @@ static int mt7921s_probe(struct sdio_func *func, .type = MT76_BUS_SDIO, }; static const struct mt7921_hif_ops mt7921_sdio_ops = { + .init_reset = mt7921s_init_reset, + .reset = mt7921s_mac_reset, .mcu_init = mt7921s_mcu_init, .drv_own = mt7921s_mcu_drv_pmctrl, .fw_own = mt7921s_mcu_fw_pmctrl, diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c index 91a7acd49ee4..137f86a6dbf8 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c @@ -5,6 +5,139 @@ #include #include "mt7921.h" #include "mac.h" +#include "../sdio.h" + +static void mt7921s_enable_irq(struct mt76_dev *dev) +{ + struct mt76_sdio *sdio = &dev->sdio; + + sdio_claim_host(sdio->func); + sdio_writel(sdio->func, WHLPCR_INT_EN_SET, MCR_WHLPCR, NULL); + sdio_release_host(sdio->func); +} + +static void mt7921s_disable_irq(struct mt76_dev *dev) +{ + struct mt76_sdio *sdio = &dev->sdio; + + sdio_claim_host(sdio->func); + sdio_writel(sdio->func, WHLPCR_INT_EN_CLR, MCR_WHLPCR, NULL); + sdio_release_host(sdio->func); +} + +static u32 mt7921s_read_whcr(struct mt76_dev *dev) +{ + return sdio_readl(dev->sdio.func, MCR_WHCR, NULL); +} + +int mt7921s_wfsys_reset(struct mt7921_dev *dev) +{ + struct mt76_sdio *sdio = &dev->mt76.sdio; + u32 val, status; + + mt7921s_mcu_drv_pmctrl(dev); + + sdio_claim_host(sdio->func); + + val = sdio_readl(sdio->func, MCR_WHCR, NULL); + val &= ~WF_WHOLE_PATH_RSTB; + sdio_writel(sdio->func, val, MCR_WHCR, NULL); + + msleep(50); + + val = sdio_readl(sdio->func, MCR_WHCR, NULL); + val &= ~WF_SDIO_WF_PATH_RSTB; + sdio_writel(sdio->func, val, MCR_WHCR, NULL); + + usleep_range(1000, 2000); + + val = sdio_readl(sdio->func, MCR_WHCR, NULL); + val |= WF_WHOLE_PATH_RSTB; + sdio_writel(sdio->func, val, MCR_WHCR, NULL); + + readx_poll_timeout(mt7921s_read_whcr, &dev->mt76, status, + status & WF_RST_DONE, 50000, 2000000); + + sdio_release_host(sdio->func); + + /* activate mt7921s again */ + mt7921s_mcu_fw_pmctrl(dev); + mt7921s_mcu_drv_pmctrl(dev); + + return 0; +} + +int mt7921s_init_reset(struct mt7921_dev *dev) +{ + set_bit(MT76_MCU_RESET, &dev->mphy.state); + + wake_up(&dev->mt76.mcu.wait); + skb_queue_purge(&dev->mt76.mcu.res_q); + wait_event_timeout(dev->mt76.sdio.wait, + mt76s_txqs_empty(&dev->mt76), 5 * HZ); + mt76_worker_disable(&dev->mt76.sdio.txrx_worker); + + mt7921s_disable_irq(&dev->mt76); + mt7921s_wfsys_reset(dev); + + mt76_worker_enable(&dev->mt76.sdio.txrx_worker); + clear_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state); + clear_bit(MT76_MCU_RESET, &dev->mphy.state); + mt7921s_enable_irq(&dev->mt76); + + return 0; +} + +int mt7921s_mac_reset(struct mt7921_dev *dev) +{ + int err; + + mt76_connac_free_pending_tx_skbs(&dev->pm, NULL); + mt76_txq_schedule_all(&dev->mphy); + mt76_worker_disable(&dev->mt76.tx_worker); + set_bit(MT76_RESET, &dev->mphy.state); + set_bit(MT76_MCU_RESET, &dev->mphy.state); + wake_up(&dev->mt76.mcu.wait); + skb_queue_purge(&dev->mt76.mcu.res_q); + wait_event_timeout(dev->mt76.sdio.wait, + mt76s_txqs_empty(&dev->mt76), 5 * HZ); + mt76_worker_disable(&dev->mt76.sdio.txrx_worker); + mt76_worker_disable(&dev->mt76.sdio.status_worker); + mt76_worker_disable(&dev->mt76.sdio.net_worker); + cancel_work_sync(&dev->mt76.sdio.stat_work); + + mt7921s_disable_irq(&dev->mt76); + mt7921s_wfsys_reset(dev); + + mt76_worker_enable(&dev->mt76.sdio.txrx_worker); + mt76_worker_enable(&dev->mt76.sdio.status_worker); + mt76_worker_enable(&dev->mt76.sdio.net_worker); + + dev->fw_assert = false; + clear_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state); + clear_bit(MT76_MCU_RESET, &dev->mphy.state); + mt7921s_enable_irq(&dev->mt76); + + err = mt7921_run_firmware(dev); + if (err) + goto out; + + err = mt7921_mcu_set_eeprom(dev); + if (err) + goto out; + + err = mt7921_mac_init(dev); + if (err) + goto out; + + err = __mt7921_start(&dev->phy); +out: + clear_bit(MT76_RESET, &dev->mphy.state); + + mt76_worker_enable(&dev->mt76.tx_worker); + + return err; +} static void mt7921s_write_txwi(struct mt7921_dev *dev, struct mt76_wcid *wcid, diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c index 049e06d7c3fb..437cddad9a90 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c @@ -21,6 +21,14 @@ mt7921s_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb, enum mt76_mcuq_id txq = MT_MCUQ_WM; int ret, pad; + /* We just return in case firmware assertion to avoid blocking the + * common workqueue to run, for example, the coredump work might be + * blocked by mt7921_mac_work that is excuting register access via sdio + * bus. + */ + if (dev->fw_assert) + return -EBUSY; + ret = mt7921_mcu_fill_message(mdev, skb, cmd, seq); if (ret) return ret; diff --git a/drivers/net/wireless/mediatek/mt76/sdio_txrx.c b/drivers/net/wireless/mediatek/mt76/sdio_txrx.c index 8de84ec556a1..cdf1d7c15241 100644 --- a/drivers/net/wireless/mediatek/mt76/sdio_txrx.c +++ b/drivers/net/wireless/mediatek/mt76/sdio_txrx.c @@ -272,6 +272,9 @@ static int mt76s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q) smp_rmb(); + if (test_bit(MT76_MCU_RESET, &dev->phy.state)) + goto next; + if (!test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) { __skb_put_zero(e->skb, 4); err = __mt76s_xmit_queue(dev, e->skb->data, @@ -350,6 +353,13 @@ void mt76s_txrx_worker(struct mt76_sdio *sdio) ret = mt76s_rx_handler(dev); if (ret > 0) nframes += ret; + + if (test_bit(MT76_MCU_RESET, &dev->phy.state)) { + if (!mt76s_txqs_empty(dev)) + continue; + else + wake_up(&sdio->wait); + } } while (nframes > 0); /* enable interrupt */ @@ -363,9 +373,29 @@ void mt76s_sdio_irq(struct sdio_func *func) struct mt76_dev *dev = sdio_get_drvdata(func); struct mt76_sdio *sdio = &dev->sdio; - if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state)) + if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state) || + test_bit(MT76_MCU_RESET, &dev->phy.state)) return; mt76_worker_schedule(&sdio->txrx_worker); } EXPORT_SYMBOL_GPL(mt76s_sdio_irq); + +bool mt76s_txqs_empty(struct mt76_dev *dev) +{ + struct mt76_queue *q; + int i; + + for (i = 0; i <= MT_TXQ_PSD + 1; i++) { + if (i <= MT_TXQ_PSD) + q = dev->phy.q_tx[i]; + else + q = dev->q_mcu[MT_MCUQ_WM]; + + if (q->first != q->head) + return false; + } + + return true; +} +EXPORT_SYMBOL_GPL(mt76s_txqs_empty);