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From:   Bhaumik Bhatt <bbhatt@codeaurora.org>
To:     manivannan.sadhasivam@linaro.org
Cc:     linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org,
        jhugo@codeaurora.org, linux-kernel@vger.kernel.org,
        carl.yin@quectel.com, loic.poulain@linaro.org,
        kvalo@codeaurora.org, Bhaumik Bhatt <bbhatt@codeaurora.org>
Subject: [RESEND PATCH] bus: mhi: core: Remove pre_init flag used for power purposes
Date:   Thu,  1 Apr 2021 14:41:49 -0700
Message-Id: <1617313309-24035-1-git-send-email-bbhatt@codeaurora.org>
Precedence: bulk

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>
---
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;
 };
-- 
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