diff mbox series

[v3,20/25] bus: mhi: ep: Add support for processing command ring

Message ID 20220212182117.49438-21-manivannan.sadhasivam@linaro.org (mailing list archive)
State Superseded
Headers show
Series Add initial support for MHI endpoint stack | expand

Commit Message

Manivannan Sadhasivam Feb. 12, 2022, 6:21 p.m. UTC
Add support for processing the command ring. Command ring is used by the
host to issue channel specific commands to the ep device. Following
commands are supported:

1. Start channel
2. Stop channel
3. Reset channel

Once the device receives the command doorbell interrupt from host, it
executes the command and generates a command completion event to the
host in the primary event ring.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/ep/main.c | 151 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)

Comments

Alex Elder Feb. 15, 2022, 10:40 p.m. UTC | #1
On 2/12/22 12:21 PM, Manivannan Sadhasivam wrote:
> Add support for processing the command ring. Command ring is used by the
> host to issue channel specific commands to the ep device. Following
> commands are supported:
> 
> 1. Start channel
> 2. Stop channel
> 3. Reset channel
> 
> Once the device receives the command doorbell interrupt from host, it
> executes the command and generates a command completion event to the
> host in the primary event ring.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

I'll let you consider my few comments below, but whether or not you
address them, this looks OK to me.

Reviewed-by: Alex Elder <elder@linaro.org>

> ---
>   drivers/bus/mhi/ep/main.c | 151 ++++++++++++++++++++++++++++++++++++++
>   1 file changed, 151 insertions(+)
> 
> diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c
> index 6378ac5c7e37..4c2ee517832c 100644
> --- a/drivers/bus/mhi/ep/main.c
> +++ b/drivers/bus/mhi/ep/main.c
> @@ -21,6 +21,7 @@
>   
>   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_send_event(struct mhi_ep_cntrl *mhi_cntrl, u32 ring_idx,
> @@ -185,6 +186,156 @@ void mhi_ep_unmap_free(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t
>   	mhi_cntrl->free_addr(mhi_cntrl, phys - offset, virt - offset, size);
>   }
>   
> +int mhi_ep_process_cmd_ring(struct mhi_ep_ring *ring, struct mhi_ep_ring_element *el)
> +{
> +	struct mhi_ep_cntrl *mhi_cntrl = ring->mhi_cntrl;
> +	struct device *dev = &mhi_cntrl->mhi_dev->dev;
> +	struct mhi_result result = {};
> +	struct mhi_ep_chan *mhi_chan;
> +	struct mhi_ep_ring *ch_ring;
> +	u32 tmp, ch_id;
> +	int ret;
> +
> +	ch_id = MHI_TRE_GET_CMD_CHID(el);
> +	mhi_chan = &mhi_cntrl->mhi_chan[ch_id];
> +	ch_ring = &mhi_cntrl->mhi_chan[ch_id].ring;
> +
> +	switch (MHI_TRE_GET_CMD_TYPE(el)) {

No MHI_PKT_TYPE_NOOP_CMD?

> +	case MHI_PKT_TYPE_START_CHAN_CMD:
> +		dev_dbg(dev, "Received START command for channel (%d)\n", ch_id);
> +
> +		mutex_lock(&mhi_chan->lock);
> +		/* Initialize and configure the corresponding channel ring */
> +		if (!ch_ring->started) {
> +			ret = mhi_ep_ring_start(mhi_cntrl, ch_ring,
> +				(union mhi_ep_ring_ctx *)&mhi_cntrl->ch_ctx_cache[ch_id]);
> +			if (ret) {
> +				dev_err(dev, "Failed to start ring for channel (%d)\n", ch_id);
> +				ret = mhi_ep_send_cmd_comp_event(mhi_cntrl,
> +							MHI_EV_CC_UNDEFINED_ERR);
> +				if (ret)
> +					dev_err(dev, "Error sending completion event (%d)\n",
> +						MHI_EV_CC_UNDEFINED_ERR);

Print the value of ret in the above message (not UNDEFINED_ERR).

> +
> +				goto err_unlock;
> +			}
> +		}
> +
> +		/* Enable DB for the channel */
> +		mhi_ep_mmio_enable_chdb_a7(mhi_cntrl, ch_id);

If an error occurs later, this will be enabled.  Is that what
you want?  Maybe wait to enable the doorbell until everything
else succeeds.

> +
> +		/* Set channel state to RUNNING */
> +		mhi_chan->state = MHI_CH_STATE_RUNNING;
> +		tmp = le32_to_cpu(mhi_cntrl->ch_ctx_cache[ch_id].chcfg);
> +		tmp &= ~CHAN_CTX_CHSTATE_MASK;
> +		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_RUNNING);
> +		mhi_cntrl->ch_ctx_cache[ch_id].chcfg = cpu_to_le32(tmp);
> +
> +		ret = mhi_ep_send_cmd_comp_event(mhi_cntrl, MHI_EV_CC_SUCCESS);
> +		if (ret) {
> +			dev_err(dev, "Error sending command completion event (%d)\n",
> +				MHI_EV_CC_SUCCESS);
> +			goto err_unlock;
> +		}
> +
> +		mutex_unlock(&mhi_chan->lock);
> +
> +		/*
> +		 * Create MHI device only during UL channel start. Since the MHI
> +		 * channels operate in a pair, we'll associate both UL and DL
> +		 * channels to the same device.
> +		 *
> +		 * We also need to check for mhi_dev != NULL because, the host
> +		 * will issue START_CHAN command during resume and we don't
> +		 * destroy the device during suspend.
> +		 */
> +		if (!(ch_id % 2) && !mhi_chan->mhi_dev) {
> +			ret = mhi_ep_create_device(mhi_cntrl, ch_id);
> +			if (ret) {

If this occurs, the host will already have been told the
request completed successfully.  Is that a problem that
can/should be avoided?

> +				dev_err(dev, "Error creating device for channel (%d)\n", ch_id);
> +				return ret;
> +			}
> +		}
> +
> +		break;
> +	case MHI_PKT_TYPE_STOP_CHAN_CMD:
> +		dev_dbg(dev, "Received STOP command for channel (%d)\n", ch_id);
> +		if (!ch_ring->started) {
> +			dev_err(dev, "Channel (%d) not opened\n", ch_id);
> +			return -ENODEV;
> +		}
> +
> +		mutex_lock(&mhi_chan->lock);
> +		/* Disable DB for the channel */
> +		mhi_ep_mmio_disable_chdb_a7(mhi_cntrl, ch_id);
> +
> +		/* Send channel disconnect status to client drivers */
> +		result.transaction_status = -ENOTCONN;
> +		result.bytes_xferd = 0;
> +		mhi_chan->xfer_cb(mhi_chan->mhi_dev, &result);
> +
> +		/* Set channel state to STOP */
> +		mhi_chan->state = MHI_CH_STATE_STOP;
> +		tmp = le32_to_cpu(mhi_cntrl->ch_ctx_cache[ch_id].chcfg);
> +		tmp &= ~CHAN_CTX_CHSTATE_MASK;
> +		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_STOP);
> +		mhi_cntrl->ch_ctx_cache[ch_id].chcfg = cpu_to_le32(tmp);
> +
> +		ret = mhi_ep_send_cmd_comp_event(mhi_cntrl, MHI_EV_CC_SUCCESS);
> +		if (ret) {
> +			dev_err(dev, "Error sending command completion event (%d)\n",
> +				MHI_EV_CC_SUCCESS);
> +			goto err_unlock;
> +		}
> +
> +		mutex_unlock(&mhi_chan->lock);
> +		break;
> +	case MHI_PKT_TYPE_RESET_CHAN_CMD:
> +		dev_dbg(dev, "Received STOP command for channel (%d)\n", ch_id);
> +		if (!ch_ring->started) {
> +			dev_err(dev, "Channel (%d) not opened\n", ch_id);
> +			return -ENODEV;
> +		}
> +
> +		mutex_lock(&mhi_chan->lock);
> +		/* Stop and reset the transfer ring */
> +		mhi_ep_ring_reset(mhi_cntrl, ch_ring);
> +
> +		/* Send channel disconnect status to client driver */
> +		result.transaction_status = -ENOTCONN;
> +		result.bytes_xferd = 0;
> +		mhi_chan->xfer_cb(mhi_chan->mhi_dev, &result);
> +
> +		/* Set channel state to DISABLED */
> +		mhi_chan->state = MHI_CH_STATE_DISABLED;
> +		tmp = le32_to_cpu(mhi_cntrl->ch_ctx_cache[ch_id].chcfg);
> +		tmp &= ~CHAN_CTX_CHSTATE_MASK;
> +		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_DISABLED);
> +		mhi_cntrl->ch_ctx_cache[ch_id].chcfg = cpu_to_le32(tmp);
> +
> +		ret = mhi_ep_send_cmd_comp_event(mhi_cntrl, MHI_EV_CC_SUCCESS);
> +		if (ret) {
> +			dev_err(dev, "Error sending command completion event (%d)\n",
> +				MHI_EV_CC_SUCCESS);
> +			goto err_unlock;
> +		}
> +
> +		mutex_unlock(&mhi_chan->lock);
> +		break;
> +	default:
> +		dev_err(dev, "Invalid command received: %d for channel (%d)\n",
> +			MHI_TRE_GET_CMD_TYPE(el), ch_id);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +
> +err_unlock:
> +	mutex_unlock(&mhi_chan->lock);
> +
> +	return ret;
> +}
> +
>   static int mhi_ep_cache_host_cfg(struct mhi_ep_cntrl *mhi_cntrl)
>   {
>   	struct device *dev = &mhi_cntrl->mhi_dev->dev;
Manivannan Sadhasivam Feb. 22, 2022, 10:35 a.m. UTC | #2
On Tue, Feb 15, 2022 at 04:40:01PM -0600, Alex Elder wrote:
> On 2/12/22 12:21 PM, Manivannan Sadhasivam wrote:
> > Add support for processing the command ring. Command ring is used by the
> > host to issue channel specific commands to the ep device. Following
> > commands are supported:
> > 
> > 1. Start channel
> > 2. Stop channel
> > 3. Reset channel
> > 
> > Once the device receives the command doorbell interrupt from host, it
> > executes the command and generates a command completion event to the
> > host in the primary event ring.
> > 
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> 
> I'll let you consider my few comments below, but whether or not you
> address them, this looks OK to me.
> 
> Reviewed-by: Alex Elder <elder@linaro.org>
> 
> > ---
> >   drivers/bus/mhi/ep/main.c | 151 ++++++++++++++++++++++++++++++++++++++
> >   1 file changed, 151 insertions(+)
> > 
> > diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c
> > index 6378ac5c7e37..4c2ee517832c 100644
> > --- a/drivers/bus/mhi/ep/main.c
> > +++ b/drivers/bus/mhi/ep/main.c
> > @@ -21,6 +21,7 @@
> >   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_send_event(struct mhi_ep_cntrl *mhi_cntrl, u32 ring_idx,
> > @@ -185,6 +186,156 @@ void mhi_ep_unmap_free(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t
> >   	mhi_cntrl->free_addr(mhi_cntrl, phys - offset, virt - offset, size);
> >   }
> > +int mhi_ep_process_cmd_ring(struct mhi_ep_ring *ring, struct mhi_ep_ring_element *el)
> > +{
> > +	struct mhi_ep_cntrl *mhi_cntrl = ring->mhi_cntrl;
> > +	struct device *dev = &mhi_cntrl->mhi_dev->dev;
> > +	struct mhi_result result = {};
> > +	struct mhi_ep_chan *mhi_chan;
> > +	struct mhi_ep_ring *ch_ring;
> > +	u32 tmp, ch_id;
> > +	int ret;
> > +
> > +	ch_id = MHI_TRE_GET_CMD_CHID(el);
> > +	mhi_chan = &mhi_cntrl->mhi_chan[ch_id];
> > +	ch_ring = &mhi_cntrl->mhi_chan[ch_id].ring;
> > +
> > +	switch (MHI_TRE_GET_CMD_TYPE(el)) {
> 
> No MHI_PKT_TYPE_NOOP_CMD?
> 

Not now.

> > +	case MHI_PKT_TYPE_START_CHAN_CMD:
> > +		dev_dbg(dev, "Received START command for channel (%d)\n", ch_id);
> > +
> > +		mutex_lock(&mhi_chan->lock);
> > +		/* Initialize and configure the corresponding channel ring */
> > +		if (!ch_ring->started) {
> > +			ret = mhi_ep_ring_start(mhi_cntrl, ch_ring,
> > +				(union mhi_ep_ring_ctx *)&mhi_cntrl->ch_ctx_cache[ch_id]);
> > +			if (ret) {
> > +				dev_err(dev, "Failed to start ring for channel (%d)\n", ch_id);
> > +				ret = mhi_ep_send_cmd_comp_event(mhi_cntrl,
> > +							MHI_EV_CC_UNDEFINED_ERR);
> > +				if (ret)
> > +					dev_err(dev, "Error sending completion event (%d)\n",
> > +						MHI_EV_CC_UNDEFINED_ERR);
> 
> Print the value of ret in the above message (not UNDEFINED_ERR).
> 
> > +
> > +				goto err_unlock;
> > +			}
> > +		}
> > +
> > +		/* Enable DB for the channel */
> > +		mhi_ep_mmio_enable_chdb_a7(mhi_cntrl, ch_id);
> 
> If an error occurs later, this will be enabled.  Is that what
> you want?  Maybe wait to enable the doorbell until everything
> else succeeds.
> 

Makes sense. Will move this to the end.

> > +
> > +		/* Set channel state to RUNNING */
> > +		mhi_chan->state = MHI_CH_STATE_RUNNING;
> > +		tmp = le32_to_cpu(mhi_cntrl->ch_ctx_cache[ch_id].chcfg);
> > +		tmp &= ~CHAN_CTX_CHSTATE_MASK;
> > +		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_RUNNING);
> > +		mhi_cntrl->ch_ctx_cache[ch_id].chcfg = cpu_to_le32(tmp);
> > +
> > +		ret = mhi_ep_send_cmd_comp_event(mhi_cntrl, MHI_EV_CC_SUCCESS);
> > +		if (ret) {
> > +			dev_err(dev, "Error sending command completion event (%d)\n",
> > +				MHI_EV_CC_SUCCESS);
> > +			goto err_unlock;
> > +		}
> > +
> > +		mutex_unlock(&mhi_chan->lock);
> > +
> > +		/*
> > +		 * Create MHI device only during UL channel start. Since the MHI
> > +		 * channels operate in a pair, we'll associate both UL and DL
> > +		 * channels to the same device.
> > +		 *
> > +		 * We also need to check for mhi_dev != NULL because, the host
> > +		 * will issue START_CHAN command during resume and we don't
> > +		 * destroy the device during suspend.
> > +		 */
> > +		if (!(ch_id % 2) && !mhi_chan->mhi_dev) {
> > +			ret = mhi_ep_create_device(mhi_cntrl, ch_id);
> > +			if (ret) {
> 
> If this occurs, the host will already have been told the
> request completed successfully.  Is that a problem that
> can/should be avoided?
> 

This should result in SYSERR. Will handle.

Thanks,
Mani
diff mbox series

Patch

diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c
index 6378ac5c7e37..4c2ee517832c 100644
--- a/drivers/bus/mhi/ep/main.c
+++ b/drivers/bus/mhi/ep/main.c
@@ -21,6 +21,7 @@ 
 
 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_send_event(struct mhi_ep_cntrl *mhi_cntrl, u32 ring_idx,
@@ -185,6 +186,156 @@  void mhi_ep_unmap_free(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t
 	mhi_cntrl->free_addr(mhi_cntrl, phys - offset, virt - offset, size);
 }
 
+int mhi_ep_process_cmd_ring(struct mhi_ep_ring *ring, struct mhi_ep_ring_element *el)
+{
+	struct mhi_ep_cntrl *mhi_cntrl = ring->mhi_cntrl;
+	struct device *dev = &mhi_cntrl->mhi_dev->dev;
+	struct mhi_result result = {};
+	struct mhi_ep_chan *mhi_chan;
+	struct mhi_ep_ring *ch_ring;
+	u32 tmp, ch_id;
+	int ret;
+
+	ch_id = MHI_TRE_GET_CMD_CHID(el);
+	mhi_chan = &mhi_cntrl->mhi_chan[ch_id];
+	ch_ring = &mhi_cntrl->mhi_chan[ch_id].ring;
+
+	switch (MHI_TRE_GET_CMD_TYPE(el)) {
+	case MHI_PKT_TYPE_START_CHAN_CMD:
+		dev_dbg(dev, "Received START command for channel (%d)\n", ch_id);
+
+		mutex_lock(&mhi_chan->lock);
+		/* Initialize and configure the corresponding channel ring */
+		if (!ch_ring->started) {
+			ret = mhi_ep_ring_start(mhi_cntrl, ch_ring,
+				(union mhi_ep_ring_ctx *)&mhi_cntrl->ch_ctx_cache[ch_id]);
+			if (ret) {
+				dev_err(dev, "Failed to start ring for channel (%d)\n", ch_id);
+				ret = mhi_ep_send_cmd_comp_event(mhi_cntrl,
+							MHI_EV_CC_UNDEFINED_ERR);
+				if (ret)
+					dev_err(dev, "Error sending completion event (%d)\n",
+						MHI_EV_CC_UNDEFINED_ERR);
+
+				goto err_unlock;
+			}
+		}
+
+		/* Enable DB for the channel */
+		mhi_ep_mmio_enable_chdb_a7(mhi_cntrl, ch_id);
+
+		/* Set channel state to RUNNING */
+		mhi_chan->state = MHI_CH_STATE_RUNNING;
+		tmp = le32_to_cpu(mhi_cntrl->ch_ctx_cache[ch_id].chcfg);
+		tmp &= ~CHAN_CTX_CHSTATE_MASK;
+		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_RUNNING);
+		mhi_cntrl->ch_ctx_cache[ch_id].chcfg = cpu_to_le32(tmp);
+
+		ret = mhi_ep_send_cmd_comp_event(mhi_cntrl, MHI_EV_CC_SUCCESS);
+		if (ret) {
+			dev_err(dev, "Error sending command completion event (%d)\n",
+				MHI_EV_CC_SUCCESS);
+			goto err_unlock;
+		}
+
+		mutex_unlock(&mhi_chan->lock);
+
+		/*
+		 * Create MHI device only during UL channel start. Since the MHI
+		 * channels operate in a pair, we'll associate both UL and DL
+		 * channels to the same device.
+		 *
+		 * We also need to check for mhi_dev != NULL because, the host
+		 * will issue START_CHAN command during resume and we don't
+		 * destroy the device during suspend.
+		 */
+		if (!(ch_id % 2) && !mhi_chan->mhi_dev) {
+			ret = mhi_ep_create_device(mhi_cntrl, ch_id);
+			if (ret) {
+				dev_err(dev, "Error creating device for channel (%d)\n", ch_id);
+				return ret;
+			}
+		}
+
+		break;
+	case MHI_PKT_TYPE_STOP_CHAN_CMD:
+		dev_dbg(dev, "Received STOP command for channel (%d)\n", ch_id);
+		if (!ch_ring->started) {
+			dev_err(dev, "Channel (%d) not opened\n", ch_id);
+			return -ENODEV;
+		}
+
+		mutex_lock(&mhi_chan->lock);
+		/* Disable DB for the channel */
+		mhi_ep_mmio_disable_chdb_a7(mhi_cntrl, ch_id);
+
+		/* Send channel disconnect status to client drivers */
+		result.transaction_status = -ENOTCONN;
+		result.bytes_xferd = 0;
+		mhi_chan->xfer_cb(mhi_chan->mhi_dev, &result);
+
+		/* Set channel state to STOP */
+		mhi_chan->state = MHI_CH_STATE_STOP;
+		tmp = le32_to_cpu(mhi_cntrl->ch_ctx_cache[ch_id].chcfg);
+		tmp &= ~CHAN_CTX_CHSTATE_MASK;
+		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_STOP);
+		mhi_cntrl->ch_ctx_cache[ch_id].chcfg = cpu_to_le32(tmp);
+
+		ret = mhi_ep_send_cmd_comp_event(mhi_cntrl, MHI_EV_CC_SUCCESS);
+		if (ret) {
+			dev_err(dev, "Error sending command completion event (%d)\n",
+				MHI_EV_CC_SUCCESS);
+			goto err_unlock;
+		}
+
+		mutex_unlock(&mhi_chan->lock);
+		break;
+	case MHI_PKT_TYPE_RESET_CHAN_CMD:
+		dev_dbg(dev, "Received STOP command for channel (%d)\n", ch_id);
+		if (!ch_ring->started) {
+			dev_err(dev, "Channel (%d) not opened\n", ch_id);
+			return -ENODEV;
+		}
+
+		mutex_lock(&mhi_chan->lock);
+		/* Stop and reset the transfer ring */
+		mhi_ep_ring_reset(mhi_cntrl, ch_ring);
+
+		/* Send channel disconnect status to client driver */
+		result.transaction_status = -ENOTCONN;
+		result.bytes_xferd = 0;
+		mhi_chan->xfer_cb(mhi_chan->mhi_dev, &result);
+
+		/* Set channel state to DISABLED */
+		mhi_chan->state = MHI_CH_STATE_DISABLED;
+		tmp = le32_to_cpu(mhi_cntrl->ch_ctx_cache[ch_id].chcfg);
+		tmp &= ~CHAN_CTX_CHSTATE_MASK;
+		tmp |= FIELD_PREP(CHAN_CTX_CHSTATE_MASK, MHI_CH_STATE_DISABLED);
+		mhi_cntrl->ch_ctx_cache[ch_id].chcfg = cpu_to_le32(tmp);
+
+		ret = mhi_ep_send_cmd_comp_event(mhi_cntrl, MHI_EV_CC_SUCCESS);
+		if (ret) {
+			dev_err(dev, "Error sending command completion event (%d)\n",
+				MHI_EV_CC_SUCCESS);
+			goto err_unlock;
+		}
+
+		mutex_unlock(&mhi_chan->lock);
+		break;
+	default:
+		dev_err(dev, "Invalid command received: %d for channel (%d)\n",
+			MHI_TRE_GET_CMD_TYPE(el), ch_id);
+		return -EINVAL;
+	}
+
+	return 0;
+
+err_unlock:
+	mutex_unlock(&mhi_chan->lock);
+
+	return ret;
+}
+
 static int mhi_ep_cache_host_cfg(struct mhi_ep_cntrl *mhi_cntrl)
 {
 	struct device *dev = &mhi_cntrl->mhi_dev->dev;