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Commit 386dad1c authored by Padmanabhan Komanduru's avatar Padmanabhan Komanduru Committed by Ian Maund
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msm: mdss: add minimum bus vote during IOMMU attach 



On 8939, we need to have SYS_MM_NOC clock enabled to be able
to perform IOMMU map/unmap transactions. Hence, add a minimum
bandwidth vote during iommu attach and remove the vote during
iommu detach.

Change-Id: I30a70ca0b9d32a5ada449e620589378b3aea6ac3
Signed-off-by: default avatarPadmanabhan Komanduru <pkomandu@codeaurora.org>
Signed-off-by: default avatarJayant Shekhar <jshekhar@codeaurora.org>
parent 54bec8b9

drivers/video/msm/mdss/mdss.h

+1 −0
Original line number Diff line number Diff line
@@ -110,6 +110,7 @@ enum mdss_hw_index { 
	MDSS_HW_DSI1,

	MDSS_HW_HDMI,

	MDSS_HW_EDP,

	MDSS_HW_IOMMU,

	MDSS_MAX_HW_BLK

};

drivers/video/msm/mdss/mdss_mdp.c

+6 −2
Original line number Diff line number Diff line
@@ -672,14 +672,18 @@ int mdss_iommu_ctrl(int enable) 
		__builtin_return_address(0), enable, mdata->iommu_ref_cnt);



	if (enable) {

		if (mdata->iommu_ref_cnt == 0)

		if (mdata->iommu_ref_cnt == 0) {

			mdss_bus_scale_set_quota(MDSS_HW_IOMMU, SZ_1M, SZ_1M);

			rc = mdss_iommu_attach(mdata);

		}

		mdata->iommu_ref_cnt++;

	} else {

		if (mdata->iommu_ref_cnt) {

			mdata->iommu_ref_cnt--;

			if (mdata->iommu_ref_cnt == 0)

			if (mdata->iommu_ref_cnt == 0) {

				rc = mdss_iommu_dettach(mdata);

				mdss_bus_scale_set_quota(MDSS_HW_IOMMU, 0, 0);

			}

		} else {

			pr_err("unbalanced iommu ref\n");

		}