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Subject[PATCH v2 1/5] bus: mhi: core: Handle syserr during power_up
Date
The MHI device may be in the syserr state when we attempt to init it in
power_up(). Since we have no local state, the handling is simple -
reset the device and wait for it to transition out of the reset state.

Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
---
drivers/bus/mhi/core/pm.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
index 52690cb..3285c9e 100644
--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -9,6 +9,7 @@
#include <linux/dma-direction.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
+#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/mhi.h>
#include <linux/module.h>
@@ -760,6 +761,7 @@ static void mhi_deassert_dev_wake(struct mhi_controller *mhi_cntrl,

int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
{
+ enum mhi_state state;
enum mhi_ee_type current_ee;
enum dev_st_transition next_state;
struct device *dev = &mhi_cntrl->mhi_dev->dev;
@@ -829,6 +831,24 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
goto error_bhi_offset;
}

+ state = mhi_get_mhi_state(mhi_cntrl);
+ if (state == MHI_STATE_SYS_ERR) {
+ mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET);
+ ret = readl_poll_timeout(mhi_cntrl->regs + MHICTRL, val,
+ !(val & MHICTRL_RESET_MASK), 1000,
+ mhi_cntrl->timeout_ms * 1000);
+ if (ret) {
+ dev_info(dev, "Failed to reset MHI due to syserr state\n");
+ goto error_bhi_offset;
+ }
+
+ /*
+ * device cleares INTVEC as part of RESET processing,
+ * re-program it
+ */
+ mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0);
+ }
+
/* Transition to next state */
next_state = MHI_IN_PBL(current_ee) ?
DEV_ST_TRANSITION_PBL : DEV_ST_TRANSITION_READY;
--
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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