On Thu, Apr 01, 2021 at 02:41:49PM -0700, Bhaumik Bhatt wrote:
> 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@xxxxxxxxxxxxxx>
Applied to mhi-next!
Thanks,
Mani
> ---
> This patch was tested on arm64 architecture.
>
> drivers/bus/mhi/core/init.c | 3 ---
> drivers/bus/mhi/core/pm.c | 20 --------------------
> include/linux/mhi.h | 2 --
> 3 files changed, 25 deletions(-)
>
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index d1d9b0d..1f61352 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -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);
>
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index e4aff77..b23eec5 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -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 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
> 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);
>
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index b16afd3..c9b36a3 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -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;
> };
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
