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Commit a3076b8c authored by Sujeev Dias's avatar Sujeev Dias Committed by Gerrit - the friendly Code Review server
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mhi: cntrl: qcom: save POR PCIe link speed during probe 



MHI host could transition into system suspend before receiving
any bandwidth change request from device. Without a default link
state, host would switch link state into unsupported state and
cause a PCIe link down. Avoid this unsupported scenario by
explicitly saving the initial link state during probe.

CRs-Fixed: 2436570
Change-Id: Icc5c681937a51eeb4f2df3c95914f924311ca388
Signed-off-by: default avatarSujeev Dias <sdias@codeaurora.org>
parent 37afaf2a

drivers/bus/mhi/controllers/mhi_arch_qcom.c

+16 −0
Original line number Diff line number Diff line
@@ -392,11 +392,13 @@ int mhi_arch_pcie_init(struct mhi_controller *mhi_cntrl) 
	struct arch_info *arch_info = mhi_dev->arch_info;

	char node[32];

	int ret;

	u16 linkstat;



	if (!arch_info) {

		struct msm_pcie_register_event *reg_event;

		struct pci_dev *root_port;

		struct device_node *root_ofnode;

		struct mhi_link_info *cur_link_info;



		arch_info = devm_kzalloc(&mhi_dev->pci_dev->dev,

					 sizeof(*arch_info), GFP_KERNEL);
@@ -485,6 +487,20 @@ int mhi_arch_pcie_init(struct mhi_controller *mhi_cntrl) 
			  mhi_arch_pcie_bw_scale_work);

		mhi_dev->bw_scale = mhi_arch_pcie_bw_scale_cb;



		/* store the current bw info */

		ret = pcie_capability_read_word(mhi_dev->pci_dev,

						PCI_EXP_LNKSTA, &linkstat);

		if (ret)

			return ret;



		cur_link_info = &arch_info->current_link_info;

		cur_link_info->target_link_speed =

			linkstat & PCI_EXP_LNKSTA_CLS;

		cur_link_info->target_link_width =

			(linkstat & PCI_EXP_LNKSTA_NLW) >>

			PCI_EXP_LNKSTA_NLW_SHIFT;

		mhi_cntrl->mhi_link_info = *cur_link_info;



		mhi_driver_register(&mhi_bl_driver);

	}