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bus: mhi: core: Remove pre_init flag used for power purposes

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Some controllers can choose to skip preparation for power up.
In that case, device context is initialized based on the pre_init
flag not being set during mhi_prepare_for_power_up(). There is no
reason MHI host driver should maintain and provide controllers
with two separate paths for preparing MHI.

Going forward, all controllers will be required to call the
mhi_prepare_for_power_up() API followed by their choice of sync
or async power up. This allows MHI host driver to get rid of the
pre_init flag and sets up a common way for all controllers to use
MHI. This also helps controllers fail early on during preparation
phase in some failure cases.

Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/1617313309-24035-1-git-send-email-bbhatt@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Bhaumik Bhatt 2021-04-01 14:41:49 -07:00 committed by Manivannan Sadhasivam
parent 8f910c8c2a
commit eee87072e2
3 changed files with 0 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/bus/mhi/core/init.c
View File

@ -1080,8 +1080,6 @@ int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl)
mhi_rddm_prepare(mhi_cntrl, mhi_cntrl->rddm_image);
}
mhi_cntrl->pre_init = true;
mutex_unlock(&mhi_cntrl->pm_mutex);
return 0;
@ -1112,7 +1110,6 @@ void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl)
}
mhi_deinit_dev_ctxt(mhi_cntrl);
mhi_cntrl->pre_init = false;
}
EXPORT_SYMBOL_GPL(mhi_unprepare_after_power_down);

20
drivers/bus/mhi/core/pm.c
View File

@ -1062,13 +1062,6 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
mutex_lock(&mhi_cntrl->pm_mutex);
mhi_cntrl->pm_state = MHI_PM_DISABLE;
if (!mhi_cntrl->pre_init) {
/* Setup device context */
ret = mhi_init_dev_ctxt(mhi_cntrl);
if (ret)
goto error_dev_ctxt;
}
ret = mhi_init_irq_setup(mhi_cntrl);
if (ret)
goto error_setup_irq;
@ -1150,10 +1143,6 @@ error_bhi_offset:
mhi_deinit_free_irq(mhi_cntrl);
error_setup_irq:
if (!mhi_cntrl->pre_init)
mhi_deinit_dev_ctxt(mhi_cntrl);
error_dev_ctxt:
mhi_cntrl->pm_state = MHI_PM_DISABLE;
mutex_unlock(&mhi_cntrl->pm_mutex);
@ -1203,15 +1192,6 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful)
flush_work(&mhi_cntrl->st_worker);
free_irq(mhi_cntrl->irq[0], mhi_cntrl);
if (!mhi_cntrl->pre_init) {
/* Free all allocated resources */
if (mhi_cntrl->fbc_image) {
mhi_free_bhie_table(mhi_cntrl, mhi_cntrl->fbc_image);
mhi_cntrl->fbc_image = NULL;
}
mhi_deinit_dev_ctxt(mhi_cntrl);
}
}
EXPORT_SYMBOL_GPL(mhi_power_down);

2
include/linux/mhi.h
View File

@ -354,7 +354,6 @@ struct mhi_controller_config {
* @index: Index of the MHI controller instance
* @bounce_buf: Use of bounce buffer
* @fbc_download: MHI host needs to do complete image transfer (optional)
* @pre_init: MHI host needs to do pre-initialization before power up
* @wake_set: Device wakeup set flag
* @irq_flags: irq flags passed to request_irq (optional)
*
@ -447,7 +446,6 @@ struct mhi_controller {
int index;
bool bounce_buf;
bool fbc_download;
bool pre_init;
bool wake_set;
unsigned long irq_flags;
};