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Commit 8508d605 authored by Rama Krishna Phani A's avatar Rama Krishna Phani A Committed by Gerrit - the friendly Code Review server
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msm: mhi_dev: Wait for host to set BHI_INTVEC value 



BHI_INTVEC will be reset to 0xFFFFFFFF when the
link gets initialized in PBL. This might happen 
if the device gets rebooted when the link is in
D3 cold. This will prevent EP PCIE HLOS driver
from sending an MSI to host to request for a reset, 
which is required in the device reboot case. 

This change is the device-side part of the fix, 
which is to wait for the host to re-init the 
BHI_INTVEC value after link resumes from D3 cold.

Change-Id: I286804d597b24d521b291119077e1ec81af32a27
Signed-off-by: default avatarRama Krishna Phani A <rphani@codeaurora.org>
parent 6b42a54e

drivers/platform/msm/mhi_dev/mhi.c

+24 −1
Original line number Diff line number Diff line
@@ -41,6 +41,9 @@ 
/* Wait time before suspend/resume is complete */

#define MHI_SUSPEND_MIN			100

#define MHI_SUSPEND_TIMEOUT		600

/* Wait time on the device for Host to set BHI_INTVEC */

#define MHI_BHI_INTVEC_MAX_CNT			200

#define MHI_BHI_INTVEC_WAIT_MS		50

#define MHI_WAKEUP_TIMEOUT_CNT		20

#define MHI_MASK_CH_EV_LEN		32

#define MHI_RING_CMD_ID			0
@@ -3162,7 +3165,7 @@ EXPORT_SYMBOL(mhi_dev_write_channel); 
static int mhi_dev_recover(struct mhi_dev *mhi)

{

	int rc = 0;

	uint32_t syserr, max_cnt = 0, bhi_intvec = 0;

	uint32_t syserr, max_cnt = 0, bhi_intvec = 0, bhi_max_cnt = 0;

	u32 mhi_reset;

	enum mhi_dev_state state;
@@ -3187,6 +3190,26 @@ static int mhi_dev_recover(struct mhi_dev *mhi) 
		if (rc)

			return rc;



		while (bhi_intvec == 0xffffffff &&

				bhi_max_cnt < MHI_BHI_INTVEC_MAX_CNT) {

			/* Wait for Host to set the bhi_intvec */

			msleep(MHI_BHI_INTVEC_WAIT_MS);

			mhi_log(MHI_MSG_VERBOSE,

					"Wait for Host to set BHI_INTVEC\n");

			rc = mhi_dev_mmio_read(mhi, BHI_INTVEC, &bhi_intvec);

			if (rc) {

				pr_err("%s: Get BHI_INTVEC failed\n", __func__);

				return rc;

			}

			bhi_max_cnt++;

		}



		if (bhi_max_cnt == MHI_BHI_INTVEC_MAX_CNT) {

			mhi_log(MHI_MSG_ERROR,

					"Host failed to set BHI_INTVEC\n");

			return -EINVAL;

		}



		if (bhi_intvec != 0xffffffff) {

			/* Indicate the host that the device is ready */

			rc = ep_pcie_trigger_msi(mhi->phandle, bhi_intvec);