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| author |   Bhaumik Bhatt <bbhatt@codeaurora.org> | 2020-09-29 23:22:07 +0530 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-02 11:33:47 +0200 |
| commit | 601455dae00a853d1d8d6d768b3b79a7d59a5853 (patch) | |
| tree | 53afa3b39624c7374e730e839835564b46364d42 /drivers/bus | |
| parent | bus: mhi: core: Introduce helper function to check device state (diff) | |
| download | linux-dev-601455dae00a853d1d8d6d768b3b79a7d59a5853.tar.xz linux-dev-601455dae00a853d1d8d6d768b3b79a7d59a5853.zip | |
bus: mhi: core: Introduce counters to track MHI device state transitions
Use counters to track MHI device state transitions such as those
to M0, M2, or M3 states. This can help in better debug, allowing
the user to see the number of transitions to a certain MHI state
when queried using debugfs entries or via other mechanisms.
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200929175218.8178-9-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/mhi/core/pm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 27bb471c8f4e..ce4d969818b4 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -256,6 +256,7 @@ int mhi_pm_m0_transition(struct mhi_controller *mhi_cntrl) dev_err(dev, "Unable to transition to M0 state\n"); return -EIO; } + mhi_cntrl->M0++; /* Wake up the device */ read_lock_bh(&mhi_cntrl->pm_lock); @@ -326,6 +327,8 @@ void mhi_pm_m1_transition(struct mhi_controller *mhi_cntrl) mhi_cntrl->dev_state = MHI_STATE_M2; write_unlock_irq(&mhi_cntrl->pm_lock); + + mhi_cntrl->M2++; wake_up_all(&mhi_cntrl->state_event); /* If there are any pending resources, exit M2 immediately */ @@ -362,6 +365,7 @@ int mhi_pm_m3_transition(struct mhi_controller *mhi_cntrl) return -EIO; } + mhi_cntrl->M3++; wake_up_all(&mhi_cntrl->state_event); return 0; |