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Wed, 10 Jul 2024 11:16:44 GMT Received: from hu-krichai-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Wed, 10 Jul 2024 04:16:38 -0700 From: Krishna chaitanya chundru Date: Wed, 10 Jul 2024 16:46:12 +0530 Subject: [PATCH v6 5/5] bus: mhi: ep: wake up host if the MHI state is in M3 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240710-wakeup_host-v6-5-ef00f31ea38d@quicinc.com> References: <20240710-wakeup_host-v6-0-ef00f31ea38d@quicinc.com> In-Reply-To: <20240710-wakeup_host-v6-0-ef00f31ea38d@quicinc.com> To: Manivannan Sadhasivam , =?utf-8?q?Krzy?= =?utf-8?q?sztof_Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , Jonathan Corbet , Jingoo Han , Lorenzo Pieralisi , Rob Herring CC: , , , , , , , , , , "Krishna chaitanya chundru" X-Mailer: b4 0.13-dev-83828 X-Developer-Signature: v=1; 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Signed-off-by: Krishna chaitanya chundru --- drivers/bus/mhi/ep/main.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c index b3eafcf2a2c5..b8713e5c1e1a 100644 --- a/drivers/bus/mhi/ep/main.c +++ b/drivers/bus/mhi/ep/main.c @@ -25,6 +25,26 @@ static DEFINE_IDA(mhi_ep_cntrl_ida); static int mhi_ep_create_device(struct mhi_ep_cntrl *mhi_cntrl, u32 ch_id); static int mhi_ep_destroy_device(struct device *dev, void *data); +static int mhi_ep_wake_host(struct mhi_ep_cntrl *mhi_cntrl) +{ + enum mhi_state state; + bool mhi_reset; + u32 count = 0; + + mhi_cntrl->wakeup_host(mhi_cntrl); + + /* Wait for Host to set the M0 state */ + while (count++ < M0_WAIT_COUNT) { + msleep(M0_WAIT_DELAY_MS); + + mhi_ep_mmio_get_mhi_state(mhi_cntrl, &state, &mhi_reset); + if (state == MHI_STATE_M0) + return 0; + } + + return -ENODEV; +} + static int mhi_ep_send_event(struct mhi_ep_cntrl *mhi_cntrl, u32 ring_idx, struct mhi_ring_element *el, bool bei) { @@ -564,6 +584,14 @@ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb) mutex_lock(&mhi_chan->lock); + if (mhi_cntrl->mhi_state == MHI_STATE_M3) { + ret = mhi_ep_wake_host(mhi_cntrl); + if (ret) { + dev_err(dev, "Failed to wakeup host\n"); + goto err_exit; + } + } + do { /* Don't process the transfer ring if the channel is not in RUNNING state */ if (mhi_chan->state != MHI_CH_STATE_RUNNING) {