[PATCH 00/10] MHI patches for v5.15 - Take 1

[PATCH 00/10] MHI patches for v5.15 - Take 1

[Manivannan Sadhasivam]

Hi Greg,

Here is the first round of MHI patches for v5.15. Most of the patches missed
v5.14 due to late submission, so sending them early now.

Summary:

1. Added a dedicated flag to the MHI client transfer APIs for inbound
buffer allocation by the MHI stack. This is required for some downlink
channels like QRTR that depends on pre-allocated buffers. Since the patch
modifies the MHI client drivers under "net/", Ack has been collected from
the netdev maintainer.

2. Added support for Cinterion MV31-W modem in pci_generic controller:
https://www.thalesgroup.com/en/markets/digital-identity-and-security/iot/iot-connectivity/products/iot-products/mv31-w-ultra-high

3. Rearranged the setting of BHI/BHIe offsets for better validation of the
register values read from MMIO.

4. Cleanup of the BHI/BHIe pointers by setting them to NULL to prevent access
after power down.

5. Added support for getting the MMIO register length from the controller
drivers. This helps in validation of the read offsets from MMIO registers
in the MHI stack.

6. Added the MMIO register length support in the controller drivers and
collected Acks from the maintainers.

7. With the help of above register length, added check for BHI/BHIe offsets
in the MHI core.

8. Used the DMA allocation APIs directly instead of using MHI specific APIs,
mhi_alloc_coherent() and mhi_free_coherent(). They were not doing anything
special other than calling the DMA allocation APIs.

9. Finally, a patch to improve the debug messages for the power up operation
by showing the current EE states.

Please consider merging!

Thanks,
Mani

Bhaumik Bhatt (8):
  bus: mhi: core: Set BHI/BHIe offsets on power up preparation
  bus: mhi: core: Set BHI and BHIe pointers to NULL in clean-up
  bus: mhi: Add MMIO region length to controller structure
  ath11k: set register access length for MHI driver
  bus: mhi: pci_generic: Set register access length for MHI driver
  bus: mhi: core: Add range checks for BHI and BHIe
  bus: mhi: core: Replace DMA allocation wrappers with original APIs
  bus: mhi: core: Improve debug messages for power up

Loic Poulain (1):
  bus: mhi: Add inbound buffers allocation flag

ULRICH Thomas (1):
  bus: mhi: pci_generic: Add Cinterion MV31-W PCIe to MHI

 drivers/bus/mhi/core/boot.c           | 17 ++---
 drivers/bus/mhi/core/init.c           | 93 +++++++++++++++++----------
 drivers/bus/mhi/core/internal.h       | 22 +------
 drivers/bus/mhi/core/main.c           | 15 +++--
 drivers/bus/mhi/core/pm.c             | 34 +++-------
 drivers/bus/mhi/pci_generic.c         | 38 +++++++++++
 drivers/net/mhi/net.c                 |  2 +-
 drivers/net/wireless/ath/ath11k/mhi.c |  1 +
 drivers/net/wwan/mhi_wwan_ctrl.c      |  2 +-
 include/linux/mhi.h                   |  9 ++-
 net/qrtr/mhi.c                        |  2 +-
 11 files changed, 136 insertions(+), 99 deletions(-)

-- 
2.25.1

[PATCH 01/10] bus: mhi: Add inbound buffers allocation flag

[Manivannan Sadhasivam]

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

Currently, the MHI controller driver defines which channels should
have their inbound buffers allocated and queued. But ideally, this is
something that should be decided by the MHI device driver instead,
which actually deals with that buffers.

Add a flag parameter to mhi_prepare_for_transfer allowing to specify
if buffers have to be allocated and queued by the MHI stack.

Keep auto_queue flag for now, but should be removed at some point.

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Tested-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/1624566520-20406-1-git-send-email-loic.poulain@linaro.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/internal.h  | 2 +-
 drivers/bus/mhi/core/main.c      | 9 ++++++---
 drivers/net/mhi/net.c            | 2 +-
 drivers/net/wwan/mhi_wwan_ctrl.c | 2 +-
 include/linux/mhi.h              | 7 ++++++-
 net/qrtr/mhi.c                   | 2 +-
 6 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index 5b9ea66b92dc..bc239a11aa69 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -682,7 +682,7 @@ void mhi_rddm_prepare(struct mhi_controller *mhi_cntrl,
 		      struct image_info *img_info);
 void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl);
 int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
-			struct mhi_chan *mhi_chan);
+			struct mhi_chan *mhi_chan, unsigned int flags);
 int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl,
 		       struct mhi_chan *mhi_chan);
 void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 22acde118bc3..69cd9dcde6d8 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -1423,7 +1423,7 @@ static void mhi_unprepare_channel(struct mhi_controller *mhi_cntrl,
 }
 
 int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
-			struct mhi_chan *mhi_chan)
+			struct mhi_chan *mhi_chan, unsigned int flags)
 {
 	int ret = 0;
 	struct device *dev = &mhi_chan->mhi_dev->dev;
@@ -1448,6 +1448,9 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
 	if (ret)
 		goto error_pm_state;
 
+	if (mhi_chan->dir == DMA_FROM_DEVICE)
+		mhi_chan->pre_alloc = !!(flags & MHI_CH_INBOUND_ALLOC_BUFS);
+
 	/* Pre-allocate buffer for xfer ring */
 	if (mhi_chan->pre_alloc) {
 		int nr_el = get_nr_avail_ring_elements(mhi_cntrl,
@@ -1603,7 +1606,7 @@ void mhi_reset_chan(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan)
 }
 
 /* Move channel to start state */
-int mhi_prepare_for_transfer(struct mhi_device *mhi_dev)
+int mhi_prepare_for_transfer(struct mhi_device *mhi_dev, unsigned int flags)
 {
 	int ret, dir;
 	struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
@@ -1614,7 +1617,7 @@ int mhi_prepare_for_transfer(struct mhi_device *mhi_dev)
 		if (!mhi_chan)
 			continue;
 
-		ret = mhi_prepare_channel(mhi_cntrl, mhi_chan);
+		ret = mhi_prepare_channel(mhi_cntrl, mhi_chan, flags);
 		if (ret)
 			goto error_open_chan;
 	}
diff --git a/drivers/net/mhi/net.c b/drivers/net/mhi/net.c
index e60e38c1f09d..11be6bcdd551 100644
--- a/drivers/net/mhi/net.c
+++ b/drivers/net/mhi/net.c
@@ -335,7 +335,7 @@ static int mhi_net_newlink(void *ctxt, struct net_device *ndev, u32 if_id,
 	u64_stats_init(&mhi_netdev->stats.tx_syncp);
 
 	/* Start MHI channels */
-	err = mhi_prepare_for_transfer(mhi_dev);
+	err = mhi_prepare_for_transfer(mhi_dev, 0);
 	if (err)
 		goto out_err;
 
diff --git a/drivers/net/wwan/mhi_wwan_ctrl.c b/drivers/net/wwan/mhi_wwan_ctrl.c
index 1bc6b69aa530..1e18420ce404 100644
--- a/drivers/net/wwan/mhi_wwan_ctrl.c
+++ b/drivers/net/wwan/mhi_wwan_ctrl.c
@@ -110,7 +110,7 @@ static int mhi_wwan_ctrl_start(struct wwan_port *port)
 	int ret;
 
 	/* Start mhi device's channel(s) */
-	ret = mhi_prepare_for_transfer(mhiwwan->mhi_dev);
+	ret = mhi_prepare_for_transfer(mhiwwan->mhi_dev, 0);
 	if (ret)
 		return ret;
 
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index 944aa3aa3035..5e08468854db 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -719,8 +719,13 @@ void mhi_device_put(struct mhi_device *mhi_dev);
  *                            host and device execution environments match and
  *                            channels are in a DISABLED state.
  * @mhi_dev: Device associated with the channels
+ * @flags: MHI channel flags
  */
-int mhi_prepare_for_transfer(struct mhi_device *mhi_dev);
+int mhi_prepare_for_transfer(struct mhi_device *mhi_dev,
+			     unsigned int flags);
+
+/* Automatically allocate and queue inbound buffers */
+#define MHI_CH_INBOUND_ALLOC_BUFS BIT(0)
 
 /**
  * mhi_unprepare_from_transfer - Reset UL and DL channels for data transfer.
diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
index fa611678af05..29b4fa3b72ab 100644
--- a/net/qrtr/mhi.c
+++ b/net/qrtr/mhi.c
@@ -79,7 +79,7 @@ static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
 	int rc;
 
 	/* start channels */
-	rc = mhi_prepare_for_transfer(mhi_dev);
+	rc = mhi_prepare_for_transfer(mhi_dev, MHI_CH_INBOUND_ALLOC_BUFS);
 	if (rc)
 		return rc;
 
-- 
2.25.1

[PATCH 02/10] bus: mhi: pci_generic: Add Cinterion MV31-W PCIe to MHI

[Manivannan Sadhasivam]

From: ULRICH Thomas <thomas.ulrich@thalesgroup.com>

This patch adds VendorID/ProductID and MBIM Channel Definitions for
M.2 Modem Card (PCIe Variant) to MHI PCI generic controller driver.

Cinterion MV31-W (by Thales)
Additional information on such Modem Card (USB or PCIe variant) is
available at:
https://www.thalesgroup.com/en/markets/digital-identity-and-security/iot/iot-connectivity/products/iot-products/mv31-w-ultra-high

Signed-off-by: ULRICH Thomas <thomas.ulrich@thalesgroup.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/PAZP264MB284690134DA010698E6B3BDDE60A9@PAZP264MB2846.FRAP264.PROD.OUTLOOK.COM
[mani: fixed the subject, whitespace, and added sideband_wake field]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/pci_generic.c | 37 +++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c
index ca3bc40427f8..6e1a86021b75 100644
--- a/drivers/bus/mhi/pci_generic.c
+++ b/drivers/bus/mhi/pci_generic.c
@@ -342,6 +342,40 @@ static const struct mhi_pci_dev_info mhi_foxconn_sdx55_info = {
 	.dma_data_width = 32
 };
 
+static const struct mhi_channel_config mhi_mv31_channels[] = {
+	MHI_CHANNEL_CONFIG_UL(0, "LOOPBACK", 64, 0),
+	MHI_CHANNEL_CONFIG_DL(1, "LOOPBACK", 64, 0),
+	/* MBIM Control Channel */
+	MHI_CHANNEL_CONFIG_UL(12, "MBIM", 64, 0),
+	MHI_CHANNEL_CONFIG_DL(13, "MBIM", 64, 0),
+	/* MBIM Data Channel */
+	MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0_MBIM", 512, 2),
+	MHI_CHANNEL_CONFIG_HW_DL(101, "IP_HW0_MBIM", 512, 3),
+};
+
+static struct mhi_event_config mhi_mv31_events[] = {
+	MHI_EVENT_CONFIG_CTRL(0, 256),
+	MHI_EVENT_CONFIG_DATA(1, 256),
+	MHI_EVENT_CONFIG_HW_DATA(2, 1024, 100),
+	MHI_EVENT_CONFIG_HW_DATA(3, 1024, 101),
+};
+
+static const struct mhi_controller_config modem_mv31_config = {
+	.max_channels = 128,
+	.timeout_ms = 20000,
+	.num_channels = ARRAY_SIZE(mhi_mv31_channels),
+	.ch_cfg = mhi_mv31_channels,
+	.num_events = ARRAY_SIZE(mhi_mv31_events),
+	.event_cfg = mhi_mv31_events,
+};
+
+static const struct mhi_pci_dev_info mhi_mv31_info = {
+	.name = "cinterion-mv31",
+	.config = &modem_mv31_config,
+	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
+	.dma_data_width = 32,
+};
+
 static const struct pci_device_id mhi_pci_id_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306),
 		.driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info },
@@ -362,6 +396,9 @@ static const struct pci_device_id mhi_pci_id_table[] = {
 	/* DW5930e (sdx55), Non-eSIM, It's also T99W175 */
 	{ PCI_DEVICE(PCI_VENDOR_ID_FOXCONN, 0xe0b1),
 		.driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info },
+	/* MV31-W (Cinterion) */
+	{ PCI_DEVICE(0x1269, 0x00b3),
+		.driver_data = (kernel_ulong_t) &mhi_mv31_info },
 	{  }
 };
 MODULE_DEVICE_TABLE(pci, mhi_pci_id_table);
-- 
2.25.1

[PATCH 03/10] bus: mhi: core: Set BHI/BHIe offsets on power up preparation

[Manivannan Sadhasivam]

From: Bhaumik Bhatt <bbhatt@codeaurora.org>

Set the BHI and/or BHIe offsets in mhi_prepare_for_power_up(),
rearrange the function, and remove the equivalent from
mhi_async_power_up(). This helps consolidate multiple checks
in different parts of the driver and can help MHI fail early on
before power up begins if the offsets are not read correctly.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1620330705-40192-2-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/init.c | 42 ++++++++++++++++++++-----------------
 drivers/bus/mhi/core/pm.c   | 28 ++++---------------------
 2 files changed, 27 insertions(+), 43 deletions(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index c81b377fca8f..11c7a3d3c9bf 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -1063,7 +1063,7 @@ EXPORT_SYMBOL_GPL(mhi_free_controller);
 int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 {
 	struct device *dev = &mhi_cntrl->mhi_dev->dev;
-	u32 bhie_off;
+	u32 bhi_off, bhie_off;
 	int ret;
 
 	mutex_lock(&mhi_cntrl->pm_mutex);
@@ -1072,29 +1072,36 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 	if (ret)
 		goto error_dev_ctxt;
 
-	/*
-	 * Allocate RDDM table if specified, this table is for debugging purpose
-	 */
-	if (mhi_cntrl->rddm_size) {
-		mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->rddm_image,
-				     mhi_cntrl->rddm_size);
+	ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, BHIOFF, &bhi_off);
+	if (ret) {
+		dev_err(dev, "Error getting BHI offset\n");
+		goto error_reg_offset;
+	}
+	mhi_cntrl->bhi = mhi_cntrl->regs + bhi_off;
 
-		/*
-		 * This controller supports RDDM, so we need to manually clear
-		 * BHIE RX registers since POR values are undefined.
-		 */
+	if (mhi_cntrl->fbc_download || mhi_cntrl->rddm_size) {
 		ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, BHIEOFF,
 				   &bhie_off);
 		if (ret) {
 			dev_err(dev, "Error getting BHIE offset\n");
-			goto bhie_error;
+			goto error_reg_offset;
 		}
-
 		mhi_cntrl->bhie = mhi_cntrl->regs + bhie_off;
+	}
+
+	if (mhi_cntrl->rddm_size) {
+		/*
+		 * This controller supports RDDM, so we need to manually clear
+		 * BHIE RX registers since POR values are undefined.
+		 */
 		memset_io(mhi_cntrl->bhie + BHIE_RXVECADDR_LOW_OFFS,
 			  0, BHIE_RXVECSTATUS_OFFS - BHIE_RXVECADDR_LOW_OFFS +
 			  4);
-
+		/*
+		 * Allocate RDDM table for debugging purpose if specified
+		 */
+		mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->rddm_image,
+				     mhi_cntrl->rddm_size);
 		if (mhi_cntrl->rddm_image)
 			mhi_rddm_prepare(mhi_cntrl, mhi_cntrl->rddm_image);
 	}
@@ -1103,11 +1110,8 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 
 	return 0;
 
-bhie_error:
-	if (mhi_cntrl->rddm_image) {
-		mhi_free_bhie_table(mhi_cntrl, mhi_cntrl->rddm_image);
-		mhi_cntrl->rddm_image = NULL;
-	}
+error_reg_offset:
+	mhi_deinit_dev_ctxt(mhi_cntrl);
 
 error_dev_ctxt:
 	mutex_unlock(&mhi_cntrl->pm_mutex);
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index bbf6cd04861e..ff7cdc8653ef 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -1059,28 +1059,8 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
 	if (ret)
 		goto error_setup_irq;
 
-	/* Setup BHI offset & INTVEC */
+	/* Setup BHI INTVEC */
 	write_lock_irq(&mhi_cntrl->pm_lock);
-	ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, BHIOFF, &val);
-	if (ret) {
-		write_unlock_irq(&mhi_cntrl->pm_lock);
-		goto error_bhi_offset;
-	}
-
-	mhi_cntrl->bhi = mhi_cntrl->regs + val;
-
-	/* Setup BHIE offset */
-	if (mhi_cntrl->fbc_download) {
-		ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, BHIEOFF, &val);
-		if (ret) {
-			write_unlock_irq(&mhi_cntrl->pm_lock);
-			dev_err(dev, "Error reading BHIE offset\n");
-			goto error_bhi_offset;
-		}
-
-		mhi_cntrl->bhie = mhi_cntrl->regs + val;
-	}
-
 	mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0);
 	mhi_cntrl->pm_state = MHI_PM_POR;
 	mhi_cntrl->ee = MHI_EE_MAX;
@@ -1091,7 +1071,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
 	if (!MHI_IN_PBL(current_ee) && current_ee != MHI_EE_AMSS) {
 		dev_err(dev, "Not a valid EE for power on\n");
 		ret = -EIO;
-		goto error_bhi_offset;
+		goto error_async_power_up;
 	}
 
 	state = mhi_get_mhi_state(mhi_cntrl);
@@ -1110,7 +1090,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
 		if (!ret) {
 			ret = -EIO;
 			dev_info(dev, "Failed to reset MHI due to syserr state\n");
-			goto error_bhi_offset;
+			goto error_async_power_up;
 		}
 
 		/*
@@ -1132,7 +1112,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
 
 	return 0;
 
-error_bhi_offset:
+error_async_power_up:
 	mhi_deinit_free_irq(mhi_cntrl);
 
 error_setup_irq:
-- 
2.25.1

[PATCH 04/10] bus: mhi: core: Set BHI and BHIe pointers to NULL in clean-up

[Manivannan Sadhasivam]

From: Bhaumik Bhatt <bbhatt@codeaurora.org>

Set the BHI and BHIe pointers to NULL as part of clean-up. This
makes sure that stale pointers are not accessed after powering
MHI down.

Suggested-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1620330705-40192-3-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/init.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 11c7a3d3c9bf..1cc2f225d3d1 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -1132,6 +1132,9 @@ void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl)
 		mhi_cntrl->rddm_image = NULL;
 	}
 
+	mhi_cntrl->bhi = NULL;
+	mhi_cntrl->bhie = NULL;
+
 	mhi_deinit_dev_ctxt(mhi_cntrl);
 }
 EXPORT_SYMBOL_GPL(mhi_unprepare_after_power_down);
-- 
2.25.1

[PATCH 05/10] bus: mhi: Add MMIO region length to controller structure

[Manivannan Sadhasivam]

From: Bhaumik Bhatt <bbhatt@codeaurora.org>

Make controller driver specify the MMIO register region length
for range checking of BHI or BHIe space. This can help validate
that offsets are in acceptable memory region or not and avoid any
boot-up issues due to BHI or BHIe memory accesses.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1620330705-40192-4-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 include/linux/mhi.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index 5e08468854db..b8ca6943f0b7 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -303,6 +303,7 @@ struct mhi_controller_config {
  * @rddm_size: RAM dump size that host should allocate for debugging purpose
  * @sbl_size: SBL image size downloaded through BHIe (optional)
  * @seg_len: BHIe vector size (optional)
+ * @reg_len: Length of the MHI MMIO region (required)
  * @fbc_image: Points to firmware image buffer
  * @rddm_image: Points to RAM dump buffer
  * @mhi_chan: Points to the channel configuration table
@@ -386,6 +387,7 @@ struct mhi_controller {
 	size_t rddm_size;
 	size_t sbl_size;
 	size_t seg_len;
+	size_t reg_len;
 	struct image_info *fbc_image;
 	struct image_info *rddm_image;
 	struct mhi_chan *mhi_chan;
-- 
2.25.1

[PATCH 06/10] ath11k: set register access length for MHI driver

[Manivannan Sadhasivam]

From: Bhaumik Bhatt <bbhatt@codeaurora.org>

MHI driver requires register space length to add range checks and
prevent memory region accesses outside of that for MMIO space.
Set it before registering the MHI controller.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1620330705-40192-5-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/net/wireless/ath/ath11k/mhi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath11k/mhi.c b/drivers/net/wireless/ath/ath11k/mhi.c
index 75cc2d80fde8..26c7ae242db6 100644
--- a/drivers/net/wireless/ath/ath11k/mhi.c
+++ b/drivers/net/wireless/ath/ath11k/mhi.c
@@ -330,6 +330,7 @@ int ath11k_mhi_register(struct ath11k_pci *ab_pci)
 	mhi_ctrl->cntrl_dev = ab->dev;
 	mhi_ctrl->fw_image = ab_pci->amss_path;
 	mhi_ctrl->regs = ab->mem;
+	mhi_ctrl->reg_len = ab->mem_len;
 
 	ret = ath11k_mhi_get_msi(ab_pci);
 	if (ret) {
-- 
2.25.1

[PATCH 07/10] bus: mhi: pci_generic: Set register access length for MHI driver

[Manivannan Sadhasivam]

From: Bhaumik Bhatt <bbhatt@codeaurora.org>

MHI driver requires register space length to add range checks and
prevent memory region accesses outside of that for MMIO space.
Set it from the PCI generic controller driver before registering
the MHI controller.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1620330705-40192-6-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/pci_generic.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c
index 6e1a86021b75..c772d94025fe 100644
--- a/drivers/bus/mhi/pci_generic.c
+++ b/drivers/bus/mhi/pci_generic.c
@@ -500,6 +500,7 @@ static int mhi_pci_claim(struct mhi_controller *mhi_cntrl,
 		return err;
 	}
 	mhi_cntrl->regs = pcim_iomap_table(pdev)[bar_num];
+	mhi_cntrl->reg_len = pci_resource_len(pdev, bar_num);
 
 	err = pci_set_dma_mask(pdev, dma_mask);
 	if (err) {
-- 
2.25.1

[PATCH 08/10] bus: mhi: core: Add range checks for BHI and BHIe

[Manivannan Sadhasivam]

From: Bhaumik Bhatt <bbhatt@codeaurora.org>

When obtaining the BHI or BHIe offsets during the power up
preparation phase, range checks are missing. These can help
controller drivers avoid accessing any address outside of the
MMIO region. Ensure that mhi_cntrl->reg_len is set before MHI
registration as it is a required field and range checks will
fail without it.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1620330705-40192-7-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/init.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 1cc2f225d3d1..aeb1e3c2cdc4 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -885,7 +885,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
 	if (!mhi_cntrl || !mhi_cntrl->cntrl_dev || !mhi_cntrl->regs ||
 	    !mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
 	    !mhi_cntrl->status_cb || !mhi_cntrl->read_reg ||
-	    !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs || !mhi_cntrl->irq)
+	    !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs ||
+	    !mhi_cntrl->irq || !mhi_cntrl->reg_len)
 		return -EINVAL;
 
 	ret = parse_config(mhi_cntrl, config);
@@ -1077,6 +1078,13 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 		dev_err(dev, "Error getting BHI offset\n");
 		goto error_reg_offset;
 	}
+
+	if (bhi_off >= mhi_cntrl->reg_len) {
+		dev_err(dev, "BHI offset: 0x%x is out of range: 0x%zx\n",
+			bhi_off, mhi_cntrl->reg_len);
+		ret = -EINVAL;
+		goto error_reg_offset;
+	}
 	mhi_cntrl->bhi = mhi_cntrl->regs + bhi_off;
 
 	if (mhi_cntrl->fbc_download || mhi_cntrl->rddm_size) {
@@ -1086,6 +1094,14 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
 			dev_err(dev, "Error getting BHIE offset\n");
 			goto error_reg_offset;
 		}
+
+		if (bhie_off >= mhi_cntrl->reg_len) {
+			dev_err(dev,
+				"BHIe offset: 0x%x is out of range: 0x%zx\n",
+				bhie_off, mhi_cntrl->reg_len);
+			ret = -EINVAL;
+			goto error_reg_offset;
+		}
 		mhi_cntrl->bhie = mhi_cntrl->regs + bhie_off;
 	}
 
-- 
2.25.1

[PATCH 09/10] bus: mhi: core: Replace DMA allocation wrappers with original APIs

[Manivannan Sadhasivam]

From: Bhaumik Bhatt <bbhatt@codeaurora.org>

There is nothing special done within the mhi_alloc_coherent() and
the mhi_free_coherent() wrapper functions. They only directly
call the equivalent DMA allocation functions. Replace them with
the original function calls such that the implementation is clear
and direct.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1624392428-9328-1-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/boot.c     | 17 +++++++++--------
 drivers/bus/mhi/core/init.c     | 32 ++++++++++++++++----------------
 drivers/bus/mhi/core/internal.h | 20 --------------------
 drivers/bus/mhi/core/main.c     |  6 +++---
 4 files changed, 28 insertions(+), 47 deletions(-)

diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
index 8100cf51cd09..0a972620a403 100644
--- a/drivers/bus/mhi/core/boot.c
+++ b/drivers/bus/mhi/core/boot.c
@@ -302,8 +302,8 @@ void mhi_free_bhie_table(struct mhi_controller *mhi_cntrl,
 	struct mhi_buf *mhi_buf = image_info->mhi_buf;
 
 	for (i = 0; i < image_info->entries; i++, mhi_buf++)
-		mhi_free_coherent(mhi_cntrl, mhi_buf->len, mhi_buf->buf,
-				  mhi_buf->dma_addr);
+		dma_free_coherent(mhi_cntrl->cntrl_dev, mhi_buf->len,
+				  mhi_buf->buf, mhi_buf->dma_addr);
 
 	kfree(image_info->mhi_buf);
 	kfree(image_info);
@@ -339,8 +339,8 @@ int mhi_alloc_bhie_table(struct mhi_controller *mhi_cntrl,
 			vec_size = sizeof(struct bhi_vec_entry) * i;
 
 		mhi_buf->len = vec_size;
-		mhi_buf->buf = mhi_alloc_coherent(mhi_cntrl, vec_size,
-						  &mhi_buf->dma_addr,
+		mhi_buf->buf = dma_alloc_coherent(mhi_cntrl->cntrl_dev,
+						  vec_size, &mhi_buf->dma_addr,
 						  GFP_KERNEL);
 		if (!mhi_buf->buf)
 			goto error_alloc_segment;
@@ -354,8 +354,8 @@ int mhi_alloc_bhie_table(struct mhi_controller *mhi_cntrl,
 
 error_alloc_segment:
 	for (--i, --mhi_buf; i >= 0; i--, mhi_buf--)
-		mhi_free_coherent(mhi_cntrl, mhi_buf->len, mhi_buf->buf,
-				  mhi_buf->dma_addr);
+		dma_free_coherent(mhi_cntrl->cntrl_dev, mhi_buf->len,
+				  mhi_buf->buf, mhi_buf->dma_addr);
 
 error_alloc_mhi_buf:
 	kfree(img_info);
@@ -442,7 +442,8 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 	if (size > firmware->size)
 		size = firmware->size;
 
-	buf = mhi_alloc_coherent(mhi_cntrl, size, &dma_addr, GFP_KERNEL);
+	buf = dma_alloc_coherent(mhi_cntrl->cntrl_dev, size, &dma_addr,
+				 GFP_KERNEL);
 	if (!buf) {
 		release_firmware(firmware);
 		goto error_fw_load;
@@ -451,7 +452,7 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
 	/* Download image using BHI */
 	memcpy(buf, firmware->data, size);
 	ret = mhi_fw_load_bhi(mhi_cntrl, dma_addr, size);
-	mhi_free_coherent(mhi_cntrl, size, buf, dma_addr);
+	dma_free_coherent(mhi_cntrl->cntrl_dev, size, buf, dma_addr);
 
 	/* Error or in EDL mode, we're done */
 	if (ret) {
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index aeb1e3c2cdc4..5aaca6d0f52b 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -129,7 +129,7 @@ static int mhi_alloc_aligned_ring(struct mhi_controller *mhi_cntrl,
 				  u64 len)
 {
 	ring->alloc_size = len + (len - 1);
-	ring->pre_aligned = mhi_alloc_coherent(mhi_cntrl, ring->alloc_size,
+	ring->pre_aligned = dma_alloc_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
 					       &ring->dma_handle, GFP_KERNEL);
 	if (!ring->pre_aligned)
 		return -ENOMEM;
@@ -221,13 +221,13 @@ void mhi_deinit_dev_ctxt(struct mhi_controller *mhi_cntrl)
 	mhi_cmd = mhi_cntrl->mhi_cmd;
 	for (i = 0; i < NR_OF_CMD_RINGS; i++, mhi_cmd++) {
 		ring = &mhi_cmd->ring;
-		mhi_free_coherent(mhi_cntrl, ring->alloc_size,
+		dma_free_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
 				  ring->pre_aligned, ring->dma_handle);
 		ring->base = NULL;
 		ring->iommu_base = 0;
 	}
 
-	mhi_free_coherent(mhi_cntrl,
+	dma_free_coherent(mhi_cntrl->cntrl_dev,
 			  sizeof(*mhi_ctxt->cmd_ctxt) * NR_OF_CMD_RINGS,
 			  mhi_ctxt->cmd_ctxt, mhi_ctxt->cmd_ctxt_addr);
 
@@ -237,17 +237,17 @@ void mhi_deinit_dev_ctxt(struct mhi_controller *mhi_cntrl)
 			continue;
 
 		ring = &mhi_event->ring;
-		mhi_free_coherent(mhi_cntrl, ring->alloc_size,
+		dma_free_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
 				  ring->pre_aligned, ring->dma_handle);
 		ring->base = NULL;
 		ring->iommu_base = 0;
 	}
 
-	mhi_free_coherent(mhi_cntrl, sizeof(*mhi_ctxt->er_ctxt) *
+	dma_free_coherent(mhi_cntrl->cntrl_dev, sizeof(*mhi_ctxt->er_ctxt) *
 			  mhi_cntrl->total_ev_rings, mhi_ctxt->er_ctxt,
 			  mhi_ctxt->er_ctxt_addr);
 
-	mhi_free_coherent(mhi_cntrl, sizeof(*mhi_ctxt->chan_ctxt) *
+	dma_free_coherent(mhi_cntrl->cntrl_dev, sizeof(*mhi_ctxt->chan_ctxt) *
 			  mhi_cntrl->max_chan, mhi_ctxt->chan_ctxt,
 			  mhi_ctxt->chan_ctxt_addr);
 
@@ -275,7 +275,7 @@ int mhi_init_dev_ctxt(struct mhi_controller *mhi_cntrl)
 		return -ENOMEM;
 
 	/* Setup channel ctxt */
-	mhi_ctxt->chan_ctxt = mhi_alloc_coherent(mhi_cntrl,
+	mhi_ctxt->chan_ctxt = dma_alloc_coherent(mhi_cntrl->cntrl_dev,
 						 sizeof(*mhi_ctxt->chan_ctxt) *
 						 mhi_cntrl->max_chan,
 						 &mhi_ctxt->chan_ctxt_addr,
@@ -307,7 +307,7 @@ int mhi_init_dev_ctxt(struct mhi_controller *mhi_cntrl)
 	}
 
 	/* Setup event context */
-	mhi_ctxt->er_ctxt = mhi_alloc_coherent(mhi_cntrl,
+	mhi_ctxt->er_ctxt = dma_alloc_coherent(mhi_cntrl->cntrl_dev,
 					       sizeof(*mhi_ctxt->er_ctxt) *
 					       mhi_cntrl->total_ev_rings,
 					       &mhi_ctxt->er_ctxt_addr,
@@ -354,7 +354,7 @@ int mhi_init_dev_ctxt(struct mhi_controller *mhi_cntrl)
 
 	/* Setup cmd context */
 	ret = -ENOMEM;
-	mhi_ctxt->cmd_ctxt = mhi_alloc_coherent(mhi_cntrl,
+	mhi_ctxt->cmd_ctxt = dma_alloc_coherent(mhi_cntrl->cntrl_dev,
 						sizeof(*mhi_ctxt->cmd_ctxt) *
 						NR_OF_CMD_RINGS,
 						&mhi_ctxt->cmd_ctxt_addr,
@@ -389,10 +389,10 @@ int mhi_init_dev_ctxt(struct mhi_controller *mhi_cntrl)
 	for (--i, --mhi_cmd; i >= 0; i--, mhi_cmd--) {
 		struct mhi_ring *ring = &mhi_cmd->ring;
 
-		mhi_free_coherent(mhi_cntrl, ring->alloc_size,
+		dma_free_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
 				  ring->pre_aligned, ring->dma_handle);
 	}
-	mhi_free_coherent(mhi_cntrl,
+	dma_free_coherent(mhi_cntrl->cntrl_dev,
 			  sizeof(*mhi_ctxt->cmd_ctxt) * NR_OF_CMD_RINGS,
 			  mhi_ctxt->cmd_ctxt, mhi_ctxt->cmd_ctxt_addr);
 	i = mhi_cntrl->total_ev_rings;
@@ -405,15 +405,15 @@ int mhi_init_dev_ctxt(struct mhi_controller *mhi_cntrl)
 		if (mhi_event->offload_ev)
 			continue;
 
-		mhi_free_coherent(mhi_cntrl, ring->alloc_size,
+		dma_free_coherent(mhi_cntrl->cntrl_dev, ring->alloc_size,
 				  ring->pre_aligned, ring->dma_handle);
 	}
-	mhi_free_coherent(mhi_cntrl, sizeof(*mhi_ctxt->er_ctxt) *
+	dma_free_coherent(mhi_cntrl->cntrl_dev, sizeof(*mhi_ctxt->er_ctxt) *
 			  mhi_cntrl->total_ev_rings, mhi_ctxt->er_ctxt,
 			  mhi_ctxt->er_ctxt_addr);
 
 error_alloc_er_ctxt:
-	mhi_free_coherent(mhi_cntrl, sizeof(*mhi_ctxt->chan_ctxt) *
+	dma_free_coherent(mhi_cntrl->cntrl_dev, sizeof(*mhi_ctxt->chan_ctxt) *
 			  mhi_cntrl->max_chan, mhi_ctxt->chan_ctxt,
 			  mhi_ctxt->chan_ctxt_addr);
 
@@ -567,7 +567,7 @@ void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,
 	if (!chan_ctxt->rbase) /* Already uninitialized */
 		return;
 
-	mhi_free_coherent(mhi_cntrl, tre_ring->alloc_size,
+	dma_free_coherent(mhi_cntrl->cntrl_dev, tre_ring->alloc_size,
 			  tre_ring->pre_aligned, tre_ring->dma_handle);
 	vfree(buf_ring->base);
 
@@ -610,7 +610,7 @@ int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl,
 	buf_ring->base = vzalloc(buf_ring->len);
 
 	if (!buf_ring->base) {
-		mhi_free_coherent(mhi_cntrl, tre_ring->alloc_size,
+		dma_free_coherent(mhi_cntrl->cntrl_dev, tre_ring->alloc_size,
 				  tre_ring->pre_aligned, tre_ring->dma_handle);
 		return -ENOMEM;
 	}
diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index bc239a11aa69..721739c5e0d5 100644
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -690,26 +690,6 @@ void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,
 void mhi_reset_chan(struct mhi_controller *mhi_cntrl,
 		    struct mhi_chan *mhi_chan);
 
-/* Memory allocation methods */
-static inline void *mhi_alloc_coherent(struct mhi_controller *mhi_cntrl,
-				       size_t size,
-				       dma_addr_t *dma_handle,
-				       gfp_t gfp)
-{
-	void *buf = dma_alloc_coherent(mhi_cntrl->cntrl_dev, size, dma_handle,
-				       gfp);
-
-	return buf;
-}
-
-static inline void mhi_free_coherent(struct mhi_controller *mhi_cntrl,
-				     size_t size,
-				     void *vaddr,
-				     dma_addr_t dma_handle)
-{
-	dma_free_coherent(mhi_cntrl->cntrl_dev, size, vaddr, dma_handle);
-}
-
 /* Event processing methods */
 void mhi_ctrl_ev_task(unsigned long data);
 void mhi_ev_task(unsigned long data);
diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index 69cd9dcde6d8..c67fd001ded1 100644
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -193,7 +193,7 @@ int mhi_map_single_no_bb(struct mhi_controller *mhi_cntrl,
 int mhi_map_single_use_bb(struct mhi_controller *mhi_cntrl,
 			  struct mhi_buf_info *buf_info)
 {
-	void *buf = mhi_alloc_coherent(mhi_cntrl, buf_info->len,
+	void *buf = dma_alloc_coherent(mhi_cntrl->cntrl_dev, buf_info->len,
 				       &buf_info->p_addr, GFP_ATOMIC);
 
 	if (!buf)
@@ -220,8 +220,8 @@ void mhi_unmap_single_use_bb(struct mhi_controller *mhi_cntrl,
 	if (buf_info->dir == DMA_FROM_DEVICE)
 		memcpy(buf_info->v_addr, buf_info->bb_addr, buf_info->len);
 
-	mhi_free_coherent(mhi_cntrl, buf_info->len, buf_info->bb_addr,
-			  buf_info->p_addr);
+	dma_free_coherent(mhi_cntrl->cntrl_dev, buf_info->len,
+			  buf_info->bb_addr, buf_info->p_addr);
 }
 
 static int get_nr_avail_ring_elements(struct mhi_controller *mhi_cntrl,
-- 
2.25.1

[PATCH 10/10] bus: mhi: core: Improve debug messages for power up

[Manivannan Sadhasivam]

From: Bhaumik Bhatt <bbhatt@codeaurora.org>

Improve error message to be more descriptive if a failure occurs
with an invalid power up execution environment. Additionally, add
a debug log to print the execution environment and MHI state
before a power up is attempted to confirm if the device is in an
expected state. This helps clarify reasons for power up failures
such as the device being found in a PBL or Emergency Download
Mode execution environment and the host expected a full power up
with Pass-Through and no image loading involved.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1620072038-36160-1-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/bus/mhi/core/pm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index ff7cdc8653ef..fb99e3727155 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -1069,12 +1069,16 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
 
 	/* Confirm that the device is in valid exec env */
 	if (!MHI_IN_PBL(current_ee) && current_ee != MHI_EE_AMSS) {
-		dev_err(dev, "Not a valid EE for power on\n");
+		dev_err(dev, "%s is not a valid EE for power on\n",
+			TO_MHI_EXEC_STR(current_ee));
 		ret = -EIO;
 		goto error_async_power_up;
 	}
 
 	state = mhi_get_mhi_state(mhi_cntrl);
+	dev_dbg(dev, "Attempting power on with EE: %s, state: %s\n",
+		TO_MHI_EXEC_STR(current_ee), TO_MHI_STATE_STR(state));
+
 	if (state == MHI_STATE_SYS_ERR) {
 		mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET);
 		ret = wait_event_timeout(mhi_cntrl->state_event,
-- 
2.25.1