linux-kernel - [PATCH 3/5] bus: mhi: Remove auto-start option

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Message-Id: <20200927033652.11789-4-manivannan.sadhasivam@linaro.org>
Date:   Sun, 27 Sep 2020 09:06:50 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     hemantk@...eaurora.org, bbhatt@...eaurora.org,
        linux-arm-msm@...r.kernel.org, jhugo@...eaurora.org,
        linux-kernel@...r.kernel.org,
        Loic Poulain <loic.poulain@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 3/5] bus: mhi: Remove auto-start option

From: Loic Poulain <loic.poulain@...aro.org>

There is really no point having an auto-start for channels.
This is confusing for the device drivers, some have to enable the
channels, others don't have... and waste resources (e.g. pre allocated
buffers) that may never be used.

This is really up to the MHI device(channel) driver to manage the state
of its channels.

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/bus/mhi/core/init.c     | 9 ---------
 drivers/bus/mhi/core/internal.h | 1 -
 include/linux/mhi.h             | 2 --
 3 files changed, 12 deletions(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 799111baceba..ca08437dffd6 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -772,7 +772,6 @@ static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
 		mhi_chan->offload_ch = ch_cfg->offload_channel;
 		mhi_chan->db_cfg.reset_req = ch_cfg->doorbell_mode_switch;
 		mhi_chan->pre_alloc = ch_cfg->auto_queue;
-		mhi_chan->auto_start = ch_cfg->auto_start;
 
 		/*
 		 * If MHI host allocates buffers, then the channel direction
@@ -1177,11 +1176,6 @@ static int mhi_driver_probe(struct device *dev)
 			goto exit_probe;
 
 		ul_chan->xfer_cb = mhi_drv->ul_xfer_cb;
-		if (ul_chan->auto_start) {
-			ret = mhi_prepare_channel(mhi_cntrl, ul_chan);
-			if (ret)
-				goto exit_probe;
-		}
 	}
 
 	ret = -EINVAL;
@@ -1215,9 +1209,6 @@ static int mhi_driver_probe(struct device *dev)
 	if (ret)
 		goto exit_probe;
 
-	if (dl_chan && dl_chan->auto_start)
-		mhi_prepare_channel(mhi_cntrl, dl_chan);
-
 	mhi_device_put(mhi_dev);
 
 	return ret;
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index 7989269ddd96..33c23203c531 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -563,7 +563,6 @@ struct mhi_chan {
 	bool configured;
 	bool offload_ch;
 	bool pre_alloc;
-	bool auto_start;
 	bool wake_capable;
 };
 
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index d4841e5a5f45..6522a4adc794 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -214,7 +214,6 @@ enum mhi_db_brst_mode {
  * @offload_channel: The client manages the channel completely
  * @doorbell_mode_switch: Channel switches to doorbell mode on M0 transition
  * @auto_queue: Framework will automatically queue buffers for DL traffic
- * @auto_start: Automatically start (open) this channel
  * @wake-capable: Channel capable of waking up the system
  */
 struct mhi_channel_config {
@@ -232,7 +231,6 @@ struct mhi_channel_config {
 	bool offload_channel;
 	bool doorbell_mode_switch;
 	bool auto_queue;
-	bool auto_start;
 	bool wake_capable;
 };
 
-- 
2.17.1