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Commit 29c57b48 authored by Nitesh Gupta's avatar Nitesh Gupta Committed by Gauri Joshi
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msm: mhi_dev: Poll for ipa_dma_disable during MHI suspend 



Poll for ipa_dma_disable prior to entering mhi suspend, until it returns
success. this is to prevent IPA disable failure in case on
pending transfers.

Change-Id: I38143284447b86ce34c47e100e6fe0c23cf28f0b
Signed-off-by: default avatarSubramanian Ananthanarayanan <skananth@codeaurora.org>
Signed-off-by: default avatarNitesh Gupta <nitegupt@codeaurora.org>
Signed-off-by: default avatarGauri Joshi <gaurjosh@codeaurora.org>
parent 1afca709

drivers/platform/msm/mhi_dev/mhi_sm.c

+21 −5
Original line number Diff line number Diff line
@@ -23,6 +23,9 @@ 
#define MHI_SM_FUNC_EXIT() MHI_SM_DBG("EXIT\n")



#define PCIE_EP_TIMER_US		500000000

#define MHI_IPA_DISABLE_DELAY_MS	10

#define MHI_IPA_DISABLE_COUNTER		20





static inline const char *mhi_sm_dev_event_str(enum mhi_dev_event state)

{
@@ -591,7 +594,7 @@ static int mhi_sm_prepare_suspend(enum mhi_dev_state new_state) 
{

	enum mhi_dev_state old_state;

	struct ep_pcie_inactivity inact_param;

	int res = 0, rc;

	int res = 0, rc, wait_timeout = 0;



	MHI_SM_DBG("Switching event:%d\n", new_state);
@@ -668,11 +671,24 @@ static int mhi_sm_prepare_suspend(enum mhi_dev_state new_state) 
			 (new_state == MHI_DEV_M3_STATE))) {

		if (mhi_sm_ctx->mhi_dev->use_ipa) {

			MHI_SM_DBG("Disable IPA with ipa_dma_disable()\n");

			while (wait_timeout < MHI_IPA_DISABLE_COUNTER) {

				/* wait for the disable to finish */

				res = ipa_dma_disable();

			if (res) {

				MHI_SM_ERR("IPA disable failed\n");

				if (!res)

					break;

				MHI_SM_ERR

					("IPA disable fail cnt:%d\n",

						wait_timeout);

				msleep(MHI_IPA_DISABLE_DELAY_MS);

				wait_timeout++;

			}



			if (wait_timeout >= MHI_IPA_DISABLE_COUNTER) {

				MHI_SM_ERR

					("Fail to disable IPA for M3\n");

				goto exit;

			}

			MHI_SM_ERR("IPA DMA successfully disabled\n");

		}

	}